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  Effect of subcritical heat treatment on microstructure and properties of high chromium cast irons Yuan Zhizhong, Liu Haiming, Ju Yulin, Chen Lu, Niu Zongran, Wang Zhiyuan, Cao Fuyang, Cheng Xiaonong Heat Treatment of Metals    2024, 49 (10): 1-7.   doi:10.13251/j.issn.0254-6051.2024.10.001 Abstract （244）      PDF （4765KB）（173）       Knowledge map    Aiming at the problem of high energy consumption in conventional quenching and tempering process of high chromium cast irons, the subcritical heat treatment tests of three kinds of high chromium cast irons were carried out. Moreover, the effect of the process on the microstructure, hardness and surface wear resistance was studied. The results show that the microstructure of high chromium cast irons is primarily composed of retained austenite, M7C3 carbide, (Fe, Cr)23C6 carbide, Mo2C carbide and pearlite when subjected to holding temperatures ranging from 500 ℃ to 650 ℃ for 1 h to 14 h. A peak value in hardness is observed for the three high chromium cast irons when holding at 550 ℃ to 600 ℃ for 6 h to 12 h, with the highest peak hardness being 57.4 HRC. The hardness is most significantly influenced by the Mo element. During the insulation process, the pearlite phase transformation of austenite is promoted by the precipitation of secondary carbides in high chromium cast irons. The effects of pearlite transformation strengthening and precipitation strengthening of secondary carbides gradually decrease with prolonged holding time. The eutectic high chromium cast iron with the highest carbon content exhibits the best wear resistance when holding at 600 ℃ for 8 h. It can be seen that the first step to improve the wear resistance of high chromium cast irons is to increase the amount of eutectic carbides, and then to add elements such as Mo to enhance the precipitation strengthening effect. Reference | Related Articles | Metrics

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  Effect of cryogenic treatment on microstructure and mechanical properties of H13 steel Di Yingnan, Ma Dangshen, Zhou Jian, Chi Hongxiao, Gu Jinbo Heat Treatment of Metals    2024, 49 (10): 38-42.   doi:10.13251/j.issn.0254-6051.2024.10.006 Abstract （240）      PDF （3226KB）（67）       Knowledge map    Microstructure evolution and mechanical properties of the H13 steel during cryogenic treatment for different time (0-4 h) were studied. The phases and microstructure were analyzed by XRD and SEM, and the mechanical properties were characterized by hardness, impact and tensile tests. The experimental results show that the cryogenic treatment can refine martensite laths, promote the transformation of retained austenite to martensite and the precipitation of banded carbide. The increase of C content in martensite results in increasing in lattice constant and in lattice distortion effect, and a shift to the left in the XRD diffraction peak. With the prolongation of cryogenic treatment time, the strength and hardness of the steel show an upward trend, while the toughness and plasticity gradually decrease. Under the condition of maintaining the same hardness, the plasticity of the H13 steel after cryogenic treatment is comparable to that of the normal heat treatment, and its strength and toughness are improved. Reference | Related Articles | Metrics

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  Measurement of CCT curves and carbide intergranular precipitation temperature of 4Cr5Mo2V hot-working die steel Gao Xingcheng, Wu Boya, Wu Xiaochun Heat Treatment of Metals    2024, 49 (9): 72-79.   doi:10.13251/j.issn.0254-6051.2024.09.012 Abstract （221）      PDF （5564KB）（36）       Knowledge map    Microstructure and hardness of 4Cr5Mo2V steel at different cooling rates were observed and measured by using thermal expansion meter, resistance meter and hardness tester, combined with scanning electron microscope and energy dispersive spectroscopy. CCT curves of the tested steel were plotted, and the temperature of carbide intergranular precipitation in the steel was determined. The results show that as the cooling rate decreases, the hardness decreases and the microstructure transforms into martensite, bainite and pearlite in sequence. The critical cooling rates for pearlite and bainite transformation are 0.015 ℃/s and 0.25 ℃/s, respectively. When the cooling rate is not greater than 0.25 ℃/s, carbides precipitate along the grain in the steel, and as the cooling rate decreases, the temperature of carbide precipitation along the grain increases. At a cooling rate of 0.01 ℃/s, the highest precipitation temperature is 1022 ℃. Reference | Related Articles | Metrics

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  Element segregation and homogenization heat treatment of DIEVAR hot working die steel Du Simin, Cheng Wenxiong, Hu Fengrong, Ren Jinqiao, Cui Xiaokang, Zhou Zhiming Heat Treatment of Metals    2024, 49 (7): 139-145.   doi:10.13251/j.issn.0254-6051.2024.07.021 Abstract （198）      PDF （6795KB）（29）       Knowledge map    As-cast microstructure, precipitated phases and element segregation characteristics of DIEVAR hot working die steel electroslag ingot were analyzed by the means of optical microscope (OM), scanning electron microscope (SEM/EDS), electron probe (EPMA), Thermo-Calc thermodynamic calculation. Then the effect of homogenization heat treatment on the microstructure and carbide and element distribution was studied. The results show that the as-cast dendrite structure of the tested steel is well developed, and the secondary dendrites are obvious. The Cr and Mo and V elements are inter-dendritically enriched, and the segregation order is Mo>V>Cr. The interdendritic precipitated phases are M23C6, M6C and MC carbides. With the increase of homogenization temperature and the extension of holding time, the dendrite microstructure gradually becomes fuzzy and even disappears, and the carbide redissolution forms a certain element diffusion zone and gradually diffuses until it is fully redissolved into the matrix, the element diffusion rate is Cr>Mo>V during the homogenization heat treatment. According to dendrite morphology, carbide redissolution, element diffusion and residual segregation index of Mo element after homogenization heat treatment, and considering the actual industrial production cost, the optimal homogenization heat treatment process of the DIEVAR steel is 1280 ℃×8 h. Reference | Related Articles | Metrics

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  Effect of secondary forging deformation on microstructure and impact properties of Cr-Mo-V die steel after spheroidal annealing Xia Yunfeng, Ma Danning, Yang Qiang, Zhou Zhongcheng, Wang Jiaoqi Heat Treatment of Metals    2024, 49 (10): 99-104.   doi:10.13251/j.issn.0254-6051.2024.10.016 Abstract （192）      PDF （3596KB）（37）       Knowledge map    Effect of secondary forging deformation on microstructure, precipitation and impact properties of Cr-Mo-V die steel was studied by means of metallographic microscope, scanning electron microscope, high resolution transmission electron microscope and impact testing machine. The results show that compared with conventional upsetting and drawing deformation, the microstructure and network carbides of the die steel after spheroidizing annealing under secondary radial forging and secondary upsetting and drawing deformation processes are significantly optimized, the impact absorbed energy are improved by 12% and 58%, respectively, and the precipitated carbides increases in quantity and is dispersed. Reference | Related Articles | Metrics

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  Research status of high-temperature mechanical properties and deformation mechanism of FeMnCoCrNi high-entropy alloy Sheng Jian, Li Dazhao, Yan Zhijie, Bai Shaobin, Chen Yongan, Xie Ruofei Heat Treatment of Metals    2024, 49 (10): 211-219.   doi:10.13251/j.issn.0254-6051.2024.10.035 Abstract （187）      PDF （4238KB）（80）       Knowledge map    As a class of emerging advanced metal materials in recent years and based on the unique multi-principal element alloy design concept, high-entropy alloys (HEAs) are expected to break through the performance limit of traditional single-principal element alloys. Among them, FeMnCoCrNi HEA is one of the most widely studied systems with excellent mechanical properties and broad application prospects. The unique “four core effects” of HEAs were firstly introduced, including high entropy effect, lattice distortion effect, hysteresis diffusion effect and cocktail effect. Secondly, the research status of FeMnCoCrNi high entropy alloy in high temperature tensile properties, high temperature creep properties and corresponding deformation mechanisms was reviewed. Reference | Related Articles | Metrics

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  Effect of Zn/Mg ratio on microstructure, mechanical properties and corrosion resistance of 7075 aluminum alloy He Zongzheng, Wu Mingdong, Yuan Shuo, Yao Shuwei, Xiao Daihong, Huang Lanping, Liu Wensheng Heat Treatment of Metals    2024, 49 (5): 1-9.   doi:10.13251/j.issn.0254-6051.2024.05.001 Abstract （185）      PDF （9223KB）（127）       Knowledge map    Effect of Zn/Mg ratio (mass fraction) on microstructure, mechanical properties, and corrosion resistance of 7075 aluminum alloys was investigated by means of optical microscope, scanning electron microscope, transmission electron microscope, tensile test, microhardness test and corrosion test. The results show that with the increase of Zn/Mg ratio from 1.76 to 2.90, the grain size of the as-cast alloy increases, the T6 age-hardening rate of the alloy is accelerated, and the time to reach peak hardness is shortened. The increase in Zn/Mg ratio results in a decrease in the recrystallization rate of the T6 peak-aged alloy and an increase in the percentage of the low-angle grain boundaries. The tensile strength of the alloy under the T6 peak-aging treatment with the Zn/Mg ratio of 2.10 is 634 MPa, the yield strength of the alloy is 588 MPa, and elongation is 8.4%. The tensile strength of the T74 aged alloy is 613 MPa, yield strength is 542 MPa, and elongation is 8.9%, and alloys with Zn/Mg ratio of 2.10 in both aging states exhibit good strength while maintaining high elongation. The corrosion resistance of the aged alloy decreases as the Zn/Mg ratio increases from 1.76 to 2.90. The corrosion resistance of the alloy after T74 aging treatment is better than that of the alloy under the T6 peak-aging state. Reference | Related Articles | Metrics

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  Effect of austenitization temperature on microstructure and mechanical properties of 40CrMnSi2Mo steel under air cooling Yu Linran, Liu Geng, Yang Zhuoyue, Su Jie, Ning Jing, Ding Yali Heat Treatment of Metals    2024, 49 (12): 1-8.   doi:10.13251/j.issn.0254-6051.2024.12.001 Abstract （179）      PDF （5846KB）（158）       Knowledge map    Effect of austenitization temperature (875-975 ℃) on the microstructure and mechanical properties of the novel Cr-Mn-Si series high strength medium carbon low alloy 40CrMnSi2Mo steel under air cooling condition was studied by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and laser scanning confocal microscope (LSCM). The results show that when austenitized at 875 ℃ and 900 ℃, the microstructure is dominated by martensite with a small amount of the undissolved precipitates (NbC). The prior austenite grains are fine and stable. The tensile strength is 1997 MPa and 2003 MPa, the elongation is 11.0% and 12.0%, and the fracture toughness is 70.3 MPa·m1/2 and 73.6 MPa·m1/2, respectively. When austenitized at 975 ℃, the solubility of NbC increases and the pinning effect decreases. The growth of austenite grain size decreases the thermal stability so that the coarse bainite/martensite multiphase is obtained under air cooling. The tensile strength is 1980 MPa, the elongation is 10.5%, and the fracture toughness is only 77.6 MPa·m1/2. The effect of the austenite grain refinement on the strength and toughness of the 40CrMnSi2Mo steel is not obvious. The fine bainite/martensite multiphase can be obtained after austenitizing at 950 ℃. The mechanical properties achieve an excellent combination, with the tensile strength of 2040 MPa, the elongation of 12% and the fracture toughness of 86.6 MPa·m1/2. Reference | Related Articles | Metrics

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  Effect of solution treatment on microstructure and low temperature impact properties of 022Cr22Ni5Mo3N duplex stainless steel Cui Liyun, Liu Qingtao, Luo Rui, Qian Xigen, Ding Hengnan, Sun Xi, Zhao Xiaotao, Liu Heng, Cheng Xiaonong Heat Treatment of Metals    2024, 49 (10): 18-24.   doi:10.13251/j.issn.0254-6051.2024.10.003 Abstract （155）      PDF （5070KB）（95）       Knowledge map    Solution treatment for as-forged 022Cr22Ni5Mo3N duplex stainless steel was carried out, and the effects of solution temperature (1000-1100 ℃) and time (1 h and 2 h) on the microstructure and -46 ℃ low temperature impact properties were studied. The results show that with the increase of solution temperature, the austenite content of the 022Cr22Ni5Mo3N stainless steel decreases, the phase boundary of austenite tends to be smooth and the number of needle-type and island austenite in ferrite decreases gradually. The low temperature impact properties increase first and then decrease with the increase of solution temperature. When the solution temperature is 1050 ℃, the low temperature impact absorbed energy of the 022Cr22Ni5Mo3N stainless steel is higher, which is about 260 J. The solution treatment can change the austenite phase morphology and adjust the phase content. Serrated phase boundaries(below 1050 ℃) and lower austenite phase content(above 1050 ℃) promote the brittle fracture of dual-phase steels at low temperatures, which is the main reason for the reduction of low-temperature toughness. Reference | Related Articles | Metrics

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  Research progress of low alloy martensitic wear-resistant steel Li Zhongbo, Wu Zhifang, Wu Run Heat Treatment of Metals    2024, 49 (7): 132-138.   doi:10.13251/j.issn.0254-6051.2024.07.020 Abstract （138）      PDF （1095KB）（52）       Knowledge map    Research progress of low alloy martensitic wear-resistant steel was reviewed, mainly involving composition design, heat treatment process and its on microstructure and mechanical properties, and wear resistance. Composition design mainly adopts a small number of multi-component system, heat treatment processes include reheat quenching-tempering treatment, direct quenching-tempering treatment, subtemperature quenching-tempering treatment, quenching-partitioning treatment and quenching-partitioning-tempering treatment. By controlling the structure shape and distribution, the hardness and toughness can be matched reasonably. The wear resistance is improved by adjusting chemical composition, refining grain, optimizing rolling cooling process and proper tempering. Reference | Related Articles | Metrics

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  Simulation and calculation of heat treatment parameters and thermophysical properties of 16CrSiNi steel using JMatPro software Ma Luyi, Du Qingyin, Li Shijian, Yang Lixin, Liu Gang, Wang Xinyu Heat Treatment of Metals    2024, 49 (7): 42-46.   doi:10.13251/j.issn.0254-6051.2024.07.007 Abstract （136）      PDF （2973KB）（96）       Knowledge map    Thermodynamic equilibrium phase composition, Jominy hardenability, phase transition, thermophysical properties and mechanical properties after quenching and tempering of the 16CrSiNi steel were simulated by using JMatPro software, and the thermodynamic equilibrium phase compositions, hardenability curves, TTA curves, TTT curves, CCT curves, quenching microstructure, mechanical properties after quenching and tempering, thermophysical properties under different temperatures as density, thermal conductivity, Young's modules, specific heat, Poisson's ratio and enthalpy were obtained. Reference | Related Articles | Metrics

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  Microstructure and mechanical properties of ultrafine grained heterostructured dual-phase steel prepared by warm rolling and intercritical annealing Yan Wenchao, Gao Bo, Xiao Lirong, Zhou Hao Heat Treatment of Metals    2024, 49 (7): 54-62.   doi:10.13251/j.issn.0254-6051.2024.07.009 Abstract （136）      PDF （5806KB）（56）       Knowledge map    Comprehensive mechanical properties of the low-carbon steel were greatly improved by producing the ultra-fine grained heterostructured dual-phase (UFG-HSDP) structure. First, the initial structure of the low carbon dual-phase structure is refined by warm rolling at 300 ℃, and then the ultra-fine grained heterostructured dual-phase steel with high martensite content (volume fraction of77%) is obtained by intercritical annealing at 740 ℃. The average grain size of ferrite and martensite is 0.78 and 0.39 μm, respectively. The UFG-HSDP steel shows excellent comprehensive mechanical properties, with yield and tensile strengths of 1.26 and 1.75 GPa, respectively, while maintaining a uniform elongation of 6.2%. The mechanical incompatibility between ferrite and martensite in the UFG-HSDP steel during tensile deformation results in significant hetero-deformation induced hardening, which enhances the total strain hardening rate and thus improves the strength-ductility match of low-carbon steel. Reference | Related Articles | Metrics

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  Effect of composite addition of trace amounts of Mn, Zn and Ti on microstructure and mechanical properties of Al-Cu-Li-Mg-Ag-Zr alloy Xu Qing, Yin Dengfeng, Wang Hua, Xie Kaiwen, Song Zhuanzhuan Heat Treatment of Metals    2024, 49 (11): 1-9.   doi:10.13251/j.issn.0254-6051.2024.11.001 Abstract （134）      PDF （5872KB）（101）       Knowledge map    Effect of composite addition of trace amounts of Mn, Zn and Ti on the microstructure and mechanical properties of Al-Cu-Li-Mg-Ag-Zr alloy was studied by using tensile testing machine, metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the composite addition of trace amounts of Mn, Zn and Ti elements can significantly refine the grain structure of the as-cast alloy, and at the same time, the insoluble second phase Al(CuMnFe) in the solution treated alloy is also refined. The composite addition of trace amounts of Mn, Zn and Ti elements can effectively promote the precipitation of the main strengthening phase T1 in the T6 and T8 peak aged Al-Cu-Li-Mg-Ag-Zr alloy, improving the mechanical properties of the alloy. Compared with the T6 peak aged, the amount of T1 phase precipitated in the T8 peak aged Al-Cu-Li-Mg-Ag-Zr alloy significantly increases, the size significantly decreases, the distribution is more uniform and dispersed, and the strength and plasticity are significantly improved. Reference | Related Articles | Metrics

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  Variant selection of α phase in β-type Ti-15Mo alloy Ren Cheng, Min Xiaohua, Fei Qi Heat Treatment of Metals    2024, 49 (9): 1-10.   doi:10.13251/j.issn.0254-6051.2024.09.001 Abstract （128）      PDF （5708KB）（132）       Knowledge map    SEM and EBSD were used to investigate the variant selection behaviour of the α phase in the β matrix and at the β grain boundaries in the Ti-15Mo alloy after solution treatment and aging. The results show that the solution treated specimen consists of single β grains without any preferred orientation. In the solution treated and aged specimen, the intragranular α phase does not undergo variant selection, instead, self-accommodation occurs among α variants, leading to a cross distribution of α phase variants at 60°. The variant selection of the film-like grain boundary α phase is influenced by the misorientation of adjacent β grains. A minor misorientation causes α phase to retain a Burgers orientation relationship with β grains on either side, whereas a major misorientation affects the precipitation of the α phase due to the interface orientation. The variant selection of the grain boundary Widmanstätten microstructure relies on the nucleation site. When the nucleation takes place at the film-like grain boundary α phase, it selects the same variants as the film-like grain boundary α phase. Nonetheless, when the nucleation occurs at the interface between the film-like grain boundary α phase and the β matrix, it is influenced by both. Reference | Related Articles | Metrics

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  Hot rolled and normalized microstructure and texture of high strength non-oriented electrical steel at different finish rolling temperatures Qiao Pengfei, Wu Zhongwang, Zhang Huimin, Jin Zili, Ren Huiping, Guo Huan Heat Treatment of Metals    2024, 49 (5): 153-157.   doi:10.13251/j.issn.0254-6051.2024.05.025 Abstract （121）      PDF （2062KB）（26）       Knowledge map    Microstructure and texture of the high strength non-oriented electrical steel hot rolled at different finish rolling temperatures and normalized were studied by means of optical microscope (OM) and electron backscattering diffraction analysis (EBSD). The results show that the higher the finish rolling temperature of the hot rolled plate, the stronger the tendency of grain aggregation and growth, the stronger the dynamic recrystallization ability, the coarser the grains. When the finish rolling temperature is low, the deformation stored energy generated during hot rolling process is released during normalization process, and the recrystallization ability is stronger. Along the thickness direction, the surface texture of the hot rolled plate is mainly Goss texture ({110}<001>), and the center layer is mainly rotating cubic texture ({001}<110>). The texture of the normalized plate corresponds to that of the hot rolled plate, and with the increase of finish rolling temperature, the proportion of favorable texture raises. Reference | Related Articles | Metrics

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  Effect of decarburizing annealing process on texture and magnetic properties of thin-gauge oriented silicon steel Wang Yitong, Liu Xuming, Guo Han, Geng Zhiyu, Xue Feng Heat Treatment of Metals    2024, 49 (6): 17-22.   doi:10.13251/j.issn.0254-6051.2024.06.003 Abstract （117）      PDF （8248KB）（38）       Knowledge map    Microstructure,texture and magnetic properties of thin-gauge oriented silicon steel after annealing at different temperatures (820, 840, 860 ℃) and time (120, 150 s) were compared by means of EBSD and XRD. The results show that increasing the decarburization annealing temperature and decreasing the decarburization annealing time can reduce the grain size, increase the proportion of favorable texture and recrystallization ratio of the oriented steel, which provide the basis for the abnormal growth of Goss grains in the process of secondary recrystallization, so as to improve the magnetic properties of the oriented silicon steel. When the decarburization annealing temperature is 860 ℃ and the annealing time is 120 s, the oriented silicon steel specimen obtains the best magnetic properties, with the magnetic induction intensity J800 of 1.807 T and the core loss P1.7 of 1.07 W·kg-1. Reference | Related Articles | Metrics

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  Effect of intercritical annealing on microstructure and properties of ferrite/bainite dual-phase steel Shi Lei, Tian Pengyong, Shi Ying, Bai Xue, Yang Fang Heat Treatment of Metals    2024, 49 (5): 158-161.   doi:10.13251/j.issn.0254-6051.2024.05.026 Abstract （112）      PDF （1906KB）（19）       Knowledge map    Effect of intercritical annealing process on microstructure and mechanical properties of ferrite/bainite dual-phase steel was studied by means of thermal simulation test machine, microhardness tester, electronic universal tensile testing machine, optical microscope and scanning electron microscope. The results show that under traditional intercritical annealing process, the microstructure is composed of ferrite, bainite and a small amount of martensite, and showing banded structures. The quenching+intercritical annealing process can refine the microstructure, obtain lath ferrite/bainite dual-phase structures, and inhibit the formation of martensite. Moreover, different processes obtain similar volume fractions of ferrite. Compared with the traditional intercritical annealing process, the quenching+intercritical annealing process can significantly reduce yield ratio and improve elongation of the tested steel. Reference | Related Articles | Metrics

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  Cause analysis on crack of bolt thread tooth Fan Kailun, Song Wenjun, Liu Wencheng, Pei Lieyong, Dai Aili, Zhang Renyin, Liu Hongyan, Li Aiping, Zhang Yongxiang Heat Treatment of Metals    2024, 49 (10): 306-310.   doi:10.13251/j.issn.0254-6051.2024.10.050 Abstract （111）      PDF （4082KB）（56）       Knowledge map    Longitudinal cracks were found on the 1-2 teeth of the tail end of the 30CrMnSiNi2 bolt thread through magnetic particle testing. Combining with the bolt production process, the causes of microcrack formation were analyzed by means of macro and micro morphology observation of the microcracks and microstructure and hardness examination of the bolt. The results show that due to improper cooling during grinding, secondary quenching occurred at the 1-2 teeth of the thread end tail tooth, resulting in fine needle-like martensite appears, causing grinding burns and quenching cracks under secondary quenching stress. In order to avoid such problems recurrence, it is recommended reinforcing the grinding cooling detection and related personnel training and improving the equipment maintenance system. Reference | Related Articles | Metrics

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  Microstructure of 11%Cr ferritic/martensitic steel in normally heat-treated state before and after irradiation Wo Jianxing, Shen Yinzhong Heat Treatment of Metals    2025, 50 (1): 6-11.   doi:10.13251/j.issn.0254-6051.2025.01.001 Abstract （109）      PDF （2775KB）（82）       Knowledge map    The microstructure of 11%Cr ferritic/martensitic steel in the normally heat-treated state before and after irradiation was experimentally studied by using transmission electron microscopy and energy dispersive spectroscopy. The results show that the primary microstructure of the 11%Cr ferritic/martensitic steel before and after irradiation consists of tempered martensitic along with a small amount of δ-ferrite. Before irradiation, a small amount of precipitates with a relatively small size are present at martensite boundaries and within martensite laths. Some irregular, blocky, large black particles are present at the interface of δ-ferrite and matrix. There are no precipitates within δ-ferrite grains. After irradiation, a large number of rod-like and blocky precipitates appear at the boundaries and interior of the martensitic lath, while the number and size of precipitates significantly increase compared to that before irradiation. The number of irregular blocky black particles at the interface of δ-ferrite and matrix increase compared to that before irradiation. Inside the δ-ferrite, a large number of blocky and needle-like precipitates are formed which may be Cr-rich nitrides, Cr-rich carbonitrides and Fe-W type precipitates. After irradiation, the precipitates inside the martensitic laths are Cr-rich M23C6 phase. Compared with the Cr-rich M23C6 phase before irradiation, the Cr and Ta contents in the M23C6 phase slightly decrease, while the Fe and Nd contents slightly increase after irradiation. However, overall, the changes in the average metal element composition of the Cr-rich M23C6 phase are relatively small. Reference | Related Articles | Metrics

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  Research progress on mechanical properties and oxidation resistance of CrAlN-based coatings He Tao, Cao Hongshuai, Li Beibei, Qi Fugang, Zhao Nie, Liao Bin, Ouyang Xiaoping Heat Treatment of Metals    2024, 49 (9): 297-307.   doi:10.13251/j.issn.0254-6051.2024.09.050 Abstract （109）      PDF （4170KB）（65）       Knowledge map    CrAlN coatings are extensively applied in the protection of the cutting tools and molds due to their higher hardness and abrasive resistance. Firstly, the structure of CrAlN coatings and its effect on the mechanical properties and thermal decomposition mechanism of the coatings is introduced in the present review, and then pointing out that the Al content and its existence mode are important factors affecting the structure and properties of CrAlN crystals. Secondly, research status of CrAlN-based multicomponent coating and multilayer coating about the mechanical properties and high temperature oxidation resistance properties is reviewed. Focused on the doping modification of elements and the designing of multilayer coating structure, the advantages and disadvantages of various modification methods are compared and analyzed, then the doping of Si, Y, V and their influence to the performance of coating are summarized, and pointing out that constructing nanoscale multilayer coating can significantly improve the performance. Finally, the high-temperature oxidation behavior and high-temperature failure mechanism of CrAlN-based coatings are discussed, providing a reference for the performance optimization of CrAlN-based hard coatings. Reference | Related Articles | Metrics