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  Creep property and microstructure evolution at 700 ℃ of a novel Fe-Ni based superalloy Jiao Chunhui, Pan Yanjun, Li Shengzhi, Bai Du, Li Bei, Deng Ge, Jia Xiaoshuai Heat Treatment of Metals    2025, 50 (2): 1-7.   doi:10.13251/j.issn.0254-6051.2025.02.001 Abstract （90）      PDF （3505KB）（73）       Knowledge map    A novel Fe-Ni-based superalloy, intended for ultra-supercritical thermal power generating units, was evaluated under constant load conditions at 700 ℃ with varying stress levels of 250 MPa and 200 MPa. The service limit and creep life of the alloy were predicted, and the microstructure evolution during creep was analyzed. The results indicate that the creep life of the alloy at 700 ℃/250 MPa and 700 ℃/200 MPa is 2378 h and 12 716 h, respectively. Based on the Larson-Miller equation, the alloy can withstand stresses of approximately 152 MPa after 100 000 h and 134 MPa after 260 000 h at 700 ℃, fully meeting the service requirements (stress of 35 MPa, creep life of 100 000 h). Microstructure analysis reveals that high-density dislocations are distributed in the 700 ℃/250 MPa specimen, whereas fewer dislocations are observed in the 700 ℃/200 MPa specimen. The MC carbides with larger size within the grains predominantly exhibit blocky or rod-like morphologies, with faster growth rates under higher stress conditions. The smaller M23C6 carbides at grain boundaries precipitate primarily in chain form, and their width increases with prolonged creep exposure. The γ′ phase within the grains remains spherical but undergoes coarsening during creep. Notably, some grain boundary γ′ phases exhibit abnormal growth, forming PFZs/DCZs, which adversely affect the alloy's high-temperature creep performance. Reference | Related Articles | Metrics

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  Effect of deformation heat treatment on microstructure and properties of Ti45Zr20Nb15V(10-x)Al10Mox refractory high entropy alloy Li Zhenglong, Pang Jingyu, Tang Guangquan, Cheng Lufan, Zhang Caiwei, Hou Xingyu, Li Wen, Zhang Haifeng Heat Treatment of Metals    2024, 49 (7): 47-53.   doi:10.13251/j.issn.0254-6051.2024.07.008 Abstract （62）      PDF （5038KB）（106）       Knowledge map    Ti45Zr20Nb15V(10-x)Al10Mox (x=0, 0.5, 1.0) refractory high entropy alloy was prepared by adding trace amounts of Mo element to the Ti45Zr20Nb15V10Al10 refractory high entropy alloy matrix, which strain hardening ability and plasticity were improved by deformation heat treatment. Microstructure and mechanical properties of the as-cast specimen and cold-rolled (deformation of 80%) and annealed (600 ℃×5 h and 800 ℃ for 1 h) specimen were investigated using X-ray diffractometer, field emission scanning electron microscope, and universal mechanical testing machine. The test results show that the as-cast alloy has a single-phase BCC structure, and the addition of Mo element increases the yield strength and maintains a fracture elongation of about 10%. After cold rolling and annealing, the microstructure of the alloy becomes BCC+Al3Zr4 dual phase with a large amount of approximately spherical nanoscale Al3Zr4 particles precipitated at and near grain boundaries, causing the alloy to transition from strain softening to strain hardening, and the yield strength of the alloy is maintained at 1100 MPa, while the fracture elongation is significantly improved. When the Mo content is 0.5%, the fracture elongation of the alloy after cold rolling annealing increases from 9.9% in as-cast state to 16.9%, exhibiting excellent strength plasticity matching and a density of only 5.638 g/cm3. Reference | Related Articles | Metrics

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  Evolution of microstructure and macrotexture of 3.1%Si oriented silicon steel Liu Yongzhen, Dong Lili, Liu Baozhi, Zhang Hao, Ma Yonglin Heat Treatment of Metals    2023, 48 (9): 238-241.   doi:10.13251/j.issn.0254-6051.2023.09.040 Abstract （80）      PDF （2289KB）（179）       Knowledge map    Microstructure and macroscopic textures of 3.1%Si oriented silicon steel during first cold rolling, decarburizing annealing, second cold rolling, high temperature annealing and tensile leveling annealing were analyzed by means of Zeiss microscope, X-ray diffractometer and other testing instruments. The results show that microstructure of the oriented silicon steel is ferrite. The average grain size is 10.23 μm after first recrystallization during decarburizing annealing, and reaches 2.0 cm after second recrystallization during high temperature annealing, and grows to 2.3 cm with increasing of uniformity after tensile leveling annealing. The main texture type of the oriented silicon steel after decarburization annealing is γ fiber texture, with a small amount of Goss texture {110}<001>. After high temperature annealing, the texture type is mainly Goss texture {110}<001>. After tensile leveling annealing, the Goss texture reaches the strongest and sharpest degree. Reference | Related Articles | Metrics

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  Design and implementation of materials database for heat treatment process simulation Zhang Lunfeng, Wang Zhihan, Zhao Junyu, An Kang, Xu Jun, Gu Jianfeng Heat Treatment of Metals    2023, 48 (9): 247-252.   doi:10.13251/j.issn.0254-6051.2023.09.042 Abstract （72）      PDF （3415KB）（212）       Knowledge map    Material parameters are the crucial data support in heat treatment process simulation. However, at present, there is a lack of relevant material databases in China, and a few existing databases have problems such as low data accuracy, poor integrity, and inability to share data, they only distinguish materials based on chemical composition, which cannot meet the parameter requirements of heat treatment process simulation. Therefore, a data structure focusing on chemical composition and microstructure was designed, and an online special material database was also independently developed. The database optimizes the data storage structure according to the characteristics of material parameters required for heat treatment process simulation. Adopting B/S architecture design realizes data sharing and improves the convenience of data use. Furthermore, by using data mining technology, the database introduces four machine learning algorithms: multivariable linear regression, Bayesian linear regression, decision tree, and random forest, and establishes an innovative data extraction mechanism. The effective data extraction strategy can be determined through the application analysis of existing data, and then the actual data requires at present can be obtained, which preliminarily solves the problem of data missing currently, and strongly supports the development of heat treatment process simulation. Reference | Related Articles | Metrics

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  Microstructure, properties and dynamic recrystallization behavior of 20Mn23AlV non-magnetic structural steel hot rolled plate Luo Xiaoyang, Cheng Ganghu, Jin Ke, Zhou Weilian, Hou Yuanyuan, Tang Xingchang Heat Treatment of Metals    2024, 49 (7): 91-99.   doi:10.13251/j.issn.0254-6051.2024.07.014 Abstract （35）      PDF （4985KB）（108）       Knowledge map    Experimental study on the density, microstructure, and mechanical properties of 20Mn23AlV non-magnetic structural steel hot-rolled plate was conducted. Additionally, multi-pass thermal simulation tests were performed to investigate the changes in microstructure and magnetic properties before and after the tests. The results show that, due to the addition of the Al element, the density of the tested steel is reduced by approximately 0.192 g/cm3 compared to that of common steels. The average tensile strength of the hot-rolled plate of non-magnetic steel is 721 MPa, the yield strength is 371 MPa, and the elongation after fracture is 69.5%, indicating good strength-ductility matching. It is found that through multi-pass thermal simulation experiments with 60% hot compression deformation, the tested steel undergoes dynamic recrystallization behavior at 950 ℃, with the average austenite grain size decreasing from 10.24 μm to 6.08 μm. There is no phase transformation before and after the multi-pass thermal simulation tests, and the relative permeability measured is 1.001 and 1.002, respectively, which meets the requirements for the magnetic properties of non-magnetic steel. Reference | Related Articles | Metrics

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  Hot deformation behavior and microstructure evolution of TC11 titanium alloy Lü Xuechun, Zhao Wenge, Yuan Mingrong, Li Heng Heat Treatment of Metals    2023, 48 (5): 279-282.   doi:10.13251/j.issn.0254-6051.2023.05.044 Abstract （96）      PDF （2582KB）（240）       Knowledge map    Deformation behavior and microstructure evolution of the TC11 titanium alloy at high temperatures were investigated. The results show that the flow stress of the alloy decreases as the deformation temperature increases and the strain rate decreases during deformation, and the degree of softening of the flow stress increases as the strain rate increases. By analysis of the processing map at true strain of 0.6, the highest energy dissipation rate is found at 940 ℃ and 0.001 s-1 and reaching 0.71. The plastic instability zone is found in the range of 920-930 ℃ and 0.9-10 s-1. The dynamic recrystallization of the α-phase during hot deformation of the TC11 titanium alloy is promoted by increase of the strain rate, the deformation volume and the deformation temperature. Reference | Related Articles | Metrics

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  Effect of solution and aging treatment on impact properties of ZL108 aluminum alloy Tan Guoyin Heat Treatment of Metals    2023, 48 (5): 291-293.   doi:10.13251/j.issn.0254-6051.2023.05.047 Abstract （46）      PDF （1272KB）（227）       Knowledge map    Impact properties of the ZL108 aluminum alloy after solution aging treatment were studied by means of OM, SEM and impact testing machine. The results show that the as-cast microstructure is mainly composed of α solid solution, coarse eutectic silicon and bulk primary silicon. After solution and aging treatment, the precipitated phase is fine and evenly distributed, with a morphology similar to short rod or coral shaped, which can better pin dislocations and help improve the impact properties of the material. The non-equilibrium distribution of elements in the as-cast specimens results in the production of a large amount of refractory eutectic silicon and bulk primary silicon. After solution and aging treatment, the precipitated phase particles continue to break under high temperature, and most of them are remelted into the matrix. The remaining precipitate particles have smaller sizes, which can better coordinate the deformation of the matrix and improve the impact properties of the specimen by 6.6 times. Reference | Related Articles | Metrics

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  Development outline 2035 of China heat treatment Heat Treatment of Metals    2025, 50 (1): 1-5.   Abstract （76）      PDF （1038KB）（81）       Knowledge map    Related Articles | Metrics

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  Hot deformation behavior of Inconel617 alloy Ding Zuojun, Ren Wenhao, Zhang Guo, Zheng Yue, He Xikou Heat Treatment of Metals    2025, 50 (2): 8-14.   doi:10.13251/j.issn.0254-6051.2025.02.002 Abstract （35）      PDF （3246KB）（31）       Knowledge map    Hot compression simulation tests of Inconel617 alloy were carried out using Gleeble-3800 thermal simulation test machine in the range of deformation temperature of 950-1200 ℃ and strain rate of 0.001-1 s-1. The hot deformation behavior under different deformation conditions were analyzed. The results show that the Inconel617 alloy exhibits obvious work hardening characteristics at the initial stage of deformation. As the strain increases, the flow stress increases to the peak value and then gradually decreases, showing dynamic softening dominated by dynamic recrystallization. The hot deformation constitutive equation of the Inconel617 is constructed based on the Arrhenius model modified by the hyperbolic sine function. The hot deformation activation energy Q is 418.4 kJ/mol. The hot working map of the Inconel617 alloy is constructed, and the appropriate hot working range is determined: deformation temperature of 1080-1170 ℃, strain rate of 0.012-1 s-1. 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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  Creep rupture property at 550 ℃ and microstructure evolution of 316H stainless steel forging for generation IV reactor Zhang Zhifeng, Zhao Jiqing, Wang Xiaofang, Wang Yunhai, Yang Gang Heat Treatment of Metals    2025, 50 (2): 15-22.   doi:10.13251/j.issn.0254-6051.2025.02.003 Abstract （28）      PDF （5069KB）（23）       Knowledge map    Creep rupture strength of 316H stainless steel forging was tested by rupture test machines at 550 ℃, and the fracture morphology and microstructure of the fracture specimens were analyzed by optical electron microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The results indicate that the 316H stainless steel forging has high creep rupture strength at 550 ℃, the creep rupture stress after 10 000 h determined through the isothermal extrapolation method is 314 MPa, which significantly exceeds the ASME design criteria. The fracture morphology of the 316H stainless steel forging consists of both dimple and intergranular fracture patterns. As the fracture duration increases, the proportion of intergranular fracture progressively rises, and the origin of the fractures transitions from non-metallic inclusions into second-phase particles at the grain boundaries. The 316H steel forging displays good structural stability throughout the 550 ℃ rupture test. As the applied stress reduces and fracture duration extends, the grain size progressively increases, the grain boundary area diminishes, and only a small amount of M23C6 and σ phases are precipitated at the grain boundaries Reference | Related Articles | Metrics

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  Influence of Mn on high-temperature mechanical properties of low Ni duplex stainless steel Yang Yuheng, He Jianguo, Song Zhigang, Feng Han, Lü Jiesheng, Wu Xiaohan, Gu Yang, Zhu Yuliang Heat Treatment of Metals    2025, 50 (2): 23-28.   doi:10.13251/j.issn.0254-6051.2025.02.004 Abstract （20）      PDF （5047KB）（23）       Knowledge map    High-temperature tensile tests were conducted on 17Cr-2Ni-2Mo-0.2N-xMn (x=2, 3, 4) duplex stainless steel at 900-1300 ℃ and 1 s-1, and thermal compression tests were conducted with 50%, 60%, and 70% deformation at 900-1300 ℃ and 1 s-1, respectively, to investigate the effect of Mn content on its high-temperature mechanical properties. The results indicate that at a deformation temperature of 900 ℃, ferrite undergoes dynamic recrystallization, while austenite only undergoes partial dynamic recrystallization. At a deformation temperature of 1200 ℃, ferrite mainly undergoes dynamic recovery, while austenite undergoes dynamic recrystallization. All specimens exhibit varying degrees of dynamic recovery or dynamic recrystallization during high-temperature deformation, with secondary hardening occurring in the final stage of the thermal compression test. In the thermal compression test, when the Mn content increases from 2% to 4%, the dynamic recrystallization behavior of 17Cr duplex stainless steel first intensifies and then slows down in the temperature range of 900-1100 ℃. However, at deformation temperatures of 1200 ℃ and higher, the effect of Mn content on the dynamic recrystallization behavior is relatively small. At the temperature range of 1150-1200 ℃, the thermal tensile deformation resistance decreases initially and then increases with the rise of manganese content, with 3% manganese providing the best hot working performance. Reference | Related Articles | Metrics

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  Analysis on friction and wear properties of materials for circular gear of harmonicgear reducers Shao Zhuhao, Yang Dawei, Wu Yongjin, Liu Zhao, Zhao Liang Heat Treatment of Metals    2024, 49 (1): 47-52.   doi:10.13251/j.issn.0254-6051.2024.01.007 Abstract （54）      PDF （3885KB）（225）       Knowledge map    Friction behaviors of two nodular cast irons (QT1 and QT2) and 40Cr steel used for domestic circular gear were studied by quantitative analysis of alloy composition, microstructure and wear resistance. The results show that for the QT1 and QT2 cast irons, the matrix is composed of pearlite, retained austenite and acicular ferrite, while the spheroidal graphite has very high nodularity and fine size. The worn positions of the QT1 and QT2 cast irons are concentrated with small fluctuations, and the maximum worn surface depths are 3.7 μm and 2.6 μm respectively. The wear morphologies of the 40Cr steel are furrows with varying depths and large fluctuations, and the maximum depth is 7.6 μm. Compared to the 40Cr steel, the QT1 and QT2 cast irons have excellent wear performance and lower friction coefficient. Domestic harmonic reducer enterprises can use nodular cast iron as circular gear material instead of the 40Cr steel. Reference | Related Articles | Metrics

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  Effect of tempering parameters on microstructure and mechanical properties of G95Cr18 martensitic stainless steel Liu Yongbao, Zhou Lina, Liu Ming, Gao Xiang, Shi Dongdan Heat Treatment of Metals    2023, 48 (7): 103-110.   doi:10.13251/j.issn.0254-6051.2023.07.018 Abstract （59）      PDF （5056KB）（104）       Knowledge map    Effect of tempering parameters on microstructure of the G95Cr18 steel was investigated by means of OM, SEM and XRD. In addition, the effects of different tempering temperatures and times on hardness, tensile properties and impact property were studied by using Vickers hardness tester, electronic universal testing machine and drop hammer impact testing machine. The results show that the retained austenite content of the G95Cr18 steel decreases gradually with the increase of tempering temperature. When the tempering temperature is 200 ℃, the decomposition amount of retained austenite is less than 3.6%, which is caused by the increase of thermal stability due to the carbon partitioning effect. When the tempering temperature is higher than 400 ℃, the retained austenite content can meet the requirement of＜6%.The hardness of the G95Cr18 steel first decreases and then increases with the increase of tempering temperature, and the secondary hardening temperature is 400 ℃. With the tempering temperature increasing, the impact absorbed energy of the G95Cr18 steel increases first and then decreases. When the tempering temperature is 300 ℃, the impact absorbed energy reaches the maximum, which is 7.1 J. When the tempering temperature is lower than 300 ℃, increasing tempering times has little effect on the microstructure and strength and toughness of the G95Cr18 steel. When the tempering temperature reaches 500 ℃, the comprehensive properties of the G95Cr18 steel decreases with tempering times increasing. Reference | Related Articles | Metrics

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  Effect of post welding heat treatment on microstructure and mechanical properties of P92 welded joints Zhao Yongtao1,2，Zhang Shaohui2，Dong Junhui1，Liu Zongchang2 HTM    doi:10.13251/j.issn.0254-6051.2015.07.007

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  CCT and TTT curves of a carbide-free bainitic steel Yang Siyuan, Li Aiguo, Luo Ping, Zhang Wenliang, Li Xianjun, Zhang Minghao, An Weicheng, Wang Kaize Heat Treatment of Metals    2025, 50 (2): 74-80.   doi:10.13251/j.issn.0254-6051.2025.02.011 Abstract （15）      PDF （6289KB）（20）       Knowledge map    Continuous cooling transformation and isothermal transformation tests of undercooled austenite were carried out on a carbide-free bainitic tested steel by using the DIL-805A phase transformation tester. The CCT and TTT curves of the tested steel were obtained. The results show that the starting and ending transformation temperatures of austenite of the tested steel are 760 ℃ and 860 ℃, respectively, and the starting transformation temperature of martensite is approximately 300 ℃. When the cooling rate is between 0.1-15 ℃/s, the undercooled austenite mainly transforms to bainite+martensite complex structure. When the cooling rate is between 15-50 ℃/s, the undercooled austenite transforms into martensite. The microhardness of the tested steel increases with the increase of cooling rate, up to 742 HV0.5. When the tested steel undergoes isothermal transformation, the bainite transformation temperature range is 300-400 ℃, and the "nose tip" temperature is about 360 ℃. 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 aging time on microstructure and mechanical properties of 7175 aluminum alloy Ji Qingtao, Sun Youzheng, Yang Hui, Zhao Zhongchao, Shi Xiaoming Heat Treatment of Metals    2024, 49 (9): 242-246.   doi:10.13251/j.issn.0254-6051.2024.09.039 Abstract （57）      PDF （5155KB）（52）       Knowledge map    Microstructure and mechanical behavior of the 7175 aluminum alloy during aging process at 120 ℃ for different time were systematically studied by means of OM, SEM, TEM, Vickers hardness tester and universal tensile testing machine. The results show that after solution treatment and aging, the microstructure of 7175 aluminum alloy is typical fibrous structure, with no obvious recrystallization occurring, and there is no obvious difference in grain morphology and second phase during aging. As the aging time increases, the size of precipitated phase at the grain boundary gradually increases, the particle size of precipitated phase in the grain increases, with the average particle size changing from 5.87 nm to 8.38 nm. When aged at 120 ℃, the hardness of 7175 aluminum alloy reaches the peak at 16 h, and the peak hardness is 196.5 HV. When aged at 120 ℃ for 16 h, the precipitated phase in the grain is much quantity, small and evenly distributed, which effectively improves the hardness of the alloy. At the same time, the yield strength of the alloy increases rapidly from 471 MPa to 490 MPa, when the aging time is 10-16 h, and the change of yield strength tends to be flat when the aging time is greater than 16 h. Reference | Related Articles | Metrics

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  Effect of heating time on surface oxidation and decarburization of 60Cr13 stainless steel cutting tools Ji Xianbin, Pan Jixiang, Li Zhaoguo, Wei Haixia, Qian Zhangxin Heat Treatment of Metals    2025, 50 (1): 31-35.   doi:10.13251/j.issn.0254-6051.2025.01.004 Abstract （57）      PDF （3078KB）（33）       Knowledge map    Effect of different heating time (20, 40 min) on surface oxidation and decarburization of 60Cr13 stainless steel cutting tools at 1050 ℃ was studied. The results show that at heating temperature of 1050 ℃, a longer holding time results in severe internal oxidation and grain boundary oxidation on the surface of the 60Cr13 stainless steel cutting tools, with an oxide layer thickness of 15-17 μm. In addition, extending the heating time intensifies the oxidation reaction in high-temperature environments, the oxygen continuously diffuses into the interior of the steel, while the carbon atoms in steel migrate outward. Due to the diffusion rate of carbon atoms exceeding the oxidation rate, the surface decarburization process is intensified, reducing the carbon content in the surface layer, resulting in a decrease in the surface hardness of the 60Cr13 stainless steel cutting tools. Reference | Related Articles | Metrics

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  Microstructure and properties of high-strength corrosion-resistant Fe-based medium entropy alloys Dai Chunduo, Li Jiangwen, Guo Chengyu, Zhang Yong, Sun Meihui, Li Tianyi, Gong Li, Pan Yue Heat Treatment of Metals    2025, 50 (1): 12-21.   doi:10.13251/j.issn.0254-6051.2025.01.002 Abstract （68）      PDF （4511KB）（40）       Knowledge map    Using Python language to edit Thermal-Calc instructions for efficient calculation of alloy phase composition, two iron-based medium entropy alloys with L21 precipitation ratio greater than 15% were obtained according to design principles. Adopting large deformation cold rolling combined with medium temperature aging process for microstructure control to achieve excellent strength plasticity matching. The results show that the tensile strength and elongation of No.1 alloy are 1592 MPa and 17.50%, respectively, while that of No.2 alloy are 1682 MPa and 13.50%, respectively. At the same time, both the alloys form stable passivation films in a 3.5wt% NaCl solution, with a pitting potential close to 0 V(vs SCE) and good corrosion resistance. The main matrix phase of the two alloys is FCC solid solution, with a small amount of BCC phase. The combination of large deformation cold rolling and medium temperature aging results in the alloy having an incomplete recovery of fine grain structure, accompanied by the formation of multiphase and multi-scale precipitation phases, which form a soft and hard coordination with the FCC matrix to improve the strength and plasticity of the alloy. The combined effect of precipitation strengthening, dislocation strengthening and grain refinement strengthening enhances the strength of alloys. The high plasticity of the alloy is due to the relief of stress concentration during medium temperature aging. The good plasticity of the FCC matrix can effectively slow down the formation and propagation of cracks. In addition, the low mismatch between Heusler_L21 phase and the matrix can also slow down the formation of microcracks at the phase boundary, allowing the two medium entropy alloys to maintain high plasticity. Reference | Related Articles | Metrics