Effect of long-term aging on microstructure and hardness of DZ411 alloy

doi:10.13251/j.issn.0254-6051.2025.04.018

Abstract

Abstract: To investigate the influence of long-term aging treatment on the microstructure and hardness of DZ411 alloy, microstructural observation and hardness measurement of the DZ411 alloy following long-term aging at various temperatures were conducted using field emission scanning electron microscope and Vickers hardness testing device to quantitatively analyze the morphology, dimensions, and quantity of γ′ phases, and to investigate the relationship between the quantitative parameters of γ′ phases and the corresponding changes in hardness. The results indicate that the heat-treated alloy exhibits a microstructure featuring the coexistence of γ/γ′ phases, with the γ′ phase being cubic and evenly dispersed, alongside a sunflower-like eutectic structure containing a proportion of blocky carbides. Following the long-term aging treatment, the size of the γ′ phase increases gradually, cubicity decreases, particle density reduces, area fraction remains relatively constant, and the rate of quantitative parameters change accelerates with higher temperatures. The growth of the γ′ phase is governed by alloying element diffusion, adhering to the LSW mechanism for growth kinetics, while precipitation strengthening of the alloy is weakened, resulting in decreased hardness values.

Key words: DZ411 alloy, long-term aging, γ′ phase, hardness

CLC Number:

TG113.12

Yang Gangzhengliang, Cao Tieshan, Wang Wei, Li Ping, Zhao Jie. Effect of long-term aging on microstructure and hardness of DZ411 alloy[J]. Heat Treatment of Metals, 2025, 50(4): 128-133.

References

[1] 中国金属学会. 中国高温合金手册[M]. 北京: 中国标准出版社, 2011.
[2] Baldan A. Review progress in Ostwald ripening theories and their applications to nickel-base superalloys Part I: Ostwald ripening theories[J]. Journal of Materials Science, 2002, 37(11): 2171-2202.
[3] Baldan A. Review progress in Ostwald ripening theories and their applications to the γ′-precipitates in nickel-base superalloys Part II: Nickel-base superalloys[J]. Journal of Materials Science, 2002, 37(12): 2379-2405.
[4] 戴贤创, 李振锋, 陈继光, 等. 镍基高温合金端淬梯度冷却过程中γ′相演化规律[J]. 中国有色金属学报, 2017, 27(2): 258-264.
Dai Xianchuang, Li Zhenfeng, Chen Jiguang, et al. Gamma prime phase evolution rule during end quench cooling in nickel-based superalloy[J]. The Chinese Journal of Nonferrous Metals, 2017, 27(2): 258-264.
[5] 夏鹏成, 于金江, 孙晓峰, 等. 高温时效时间对定向凝固DZ951镍基高温合金组织和持久性能的影响[J]. 稀有金属材料与工程, 2010, 39(1): 69-71.
Xia Pengcheng, Yu Jinjiang, Sun Xiaofeng, et al. Influence of high-temperature aging time on microstructure and stress rupture property of directionally solidified DZ951 Ni-based superalloys[J]. Rare Metal Materials and Engineering, 2010, 39(1): 69-71.
[6] 韩凤奎, 燕平, 赵京晨, 等. 长期时效对DD407单晶高温合金组织和中温性能的影响[J]. 钢铁研究学报, 2011, 23(9): 55-58.
Han Fengkui, Yan Ping, Zhao Jingchen, et al. Effect of long-term aging on microstructure and medium temperature performance of single crystal superalloy DD407[J]. Journal of Iron and Steel Research, 2011, 23(9): 55-58.
[7] 曾超. 定向凝固镍基高温合金DZ444长期时效热稳定性的研究[D]. 沈阳: 沈阳理工大学, 2014.
Zeng Chao. Study on the thermal stability of directionally solidified Ni-based superalloy DZ444[D]. Shenyang: Shenyang Ligong University, 2014.
[8] Paa-rai C, Norachan J, Wangyao P, et al. Effect of long-term aging on microstructural restoration in cast nickel base superalloy, GTD-111[J]. Materials Science Forum, 2017, 4376: 426-432.
[9] 张雅静, 刘丽, 史学军, 等. 中间热处理温度对DSM11合金组织和性能的影响[J]. 钢铁研究学报, 2003, 15(7): 216-218.
Zhang Yajing, Liu Li, Shi Xuejun, et al. Effect of middle heat treatment temperature on microstructure and properties of alloy DSM11[J]. Journal of Iron and Steel Research, 2003, 15(7): 216-218.
[10] 高佩. Haynes 230镍基合金的变形行为及组织性能变化规律研究[D]. 镇江: 江苏大学, 2021.
Gao Pei. Research on deformation behavior and change rule of microstructure and properties for Haynes 230 nickel-based alloy[D]. Zhenjiang: Jiangsu University, 2021.
[11] 杨贺阳, 温红宁, 金俊松, 等. 新型镍基粉末高温合金连续加热过程中γ′相溶解行为[J]. 中国有色金属学报, 2023, 33(9) : 2861-2872.
Yang Heyang, Wen Hongning, Jin Junsong, et al. Dissolution behavior of γ′ phase of novel nickel-based powder superalloy during continuous heating[J]. The Chinese Journal of Nonferrous Metals, 2023, 33(9): 2861-2872.
[12] 温莹, 田高峰, 刘国权, 等. 镍基粉末高温合金中γ′相的形貌特征的定量表征研究[J]. 中国体视学与图像分析, 2007(3): 162-166.
Wen Ying, Tian Gaofeng, Liu Guoquan, et al. Morphology characterization of γ′ phase in a P/M nickel-base superalloy[J]. Chinese Journal of Stereology and Image Analysis, 2007(3): 162-166.
[13] 侯永涛. 690镍基合金焊丝熔敷金属组织定量研究[D]. 北京: 机械科学研究总院, 2022.
Hou Yongtao. Quantitative study on microstructure of deposited metal of 690 nickel-base alloy welding wire[D]. Beijing: General Institute of Mechanical Science Research, 2022.
[14] Osada T, Gu Y, Nagashima N, et al. Optimum microstructure combination for maximizing tensile strength in a polycrystalline superalloy with a two-phase structure[J]. Acta Materialia, 2013, 61(5): 1820-1829.
[15] 侯介山, 丛培娟, 周兰章, 等. Hf对抗热腐蚀镍基高温合金微观组织和力学性能的影响[J]. 中国有色金属学报, 2011, 21(5): 945-953.
Hou Jieshan, Cong Peijuan, Zhou Lanzhang, et al. Effect of Hf on microstructure and mechanical behavior of hot corrosion resistant Ni-based superalloys[J]. The Chinese Journal of Nonferrous Metals, 2011, 21(5) : 945-953.
[16] 赵运兴, 王薪, 刘军, 等. 新型镍基单晶高温合金的显微组织与力学性能[J]. 中国有色金属学报, 2015, 25(10): 2695-2706.
Zhao Yunxing, Wang Xin, Liu Jun, et al. Microstructure and mechanical properties of new nickel-base single crystal superalloy[J]. The Chinese Journal of Nonferrous Metals, 2015, 25(10): 2695-2706.
[17] Yu J J, Lian Z W, Chu Z K, et al. Properties and microstructures of M951 alloy after long-term exposure[J]. Materials Science Engineering A, 2009, 527(7): 1896-1902.
[18] Qin X Z, Guo J T, Yuan C, et al. Effects of long-term thermal exposure on the microstructure and properties of a cast Ni-base superalloy[J]. Metallurgical and Materials Transactions A, 2007, 38(12): 3014-3022.
[19] Xia P C, Yu J J, Sun X F, et al. The influence of thermal exposure on the microstructure and stress rupture property of DZ951 nickel-base alloy[J]. Journal of Alloys and Compounds, 2006, 443(1): 125-131.
[20] 何国爱, 丁晗晖, 刘琛仄, 等. 粉末特性对镍基粉末冶金高温合金组织及热变形行为的影响[J]. 中国有色金属学报, 2016, 26(1): 37-49.
He Guoai, Ding Hanhui, Liu Chenze, et al. Effects of powder characteristics on microstructure and deformation activation energy of nickel based superalloy[J]. The Chinese Journal of Nonferrous Metals, 2016, 26(1): 37-49.