Effect of heat treatment system on microstructure and hardness of GH4698 superalloy

doi:10.13251/j.issn.0254-6051.2024.05.034

Abstract

Abstract: Change law of microstructure and hardness of GH4698 superalloy under different heat treatment systems was studied. The results show that for the GH4698 superalloy standard heat treatment system, the primary aging cooling rate has a little effect on the size, content, spacing of γ′ precipitated phase and hardness. In the primary aging stage, the larger the cooling rate, the smaller the γ′ phase size and the higher the hardness. When the primary aging temperature is near 1000 ℃, the γ′ phase with size of 80-260 nm can precipitate effectively, which is more conducive to the subsequent secondary aging. In the secondary aging stage and in the temperature range of 725-775 ℃, the γ′ phase finer than 80 nm can fully precipitate, but when the temperature is below 725 ℃ and above 775 ℃, the γ′ phase finer than 80 nm cannot precipitate effectively.

Key words: GH4698 superalloy, heat treatment, aging temperature, mechanical properties

CLC Number:

TG15

Zhang Rui, Zhang Xiaochen, Zhang Zheng, Cui Wenming, Yang Jiadian, Liu Yanxu, Wang Jixing, Bai Jiayuan. Effect of heat treatment system on microstructure and hardness of GH4698 superalloy[J]. Heat Treatment of Metals, 2024, 49(5): 204-209.

References

[1]师昌绪, 仲增墉. 中国高温合金五十年[M]. 北京: 冶金工业出版社, 2006.
[2]李蓬川. 大型航空模锻件的生产现状及发展趋势[J]. 大型铸锻件, 2011(2): 39-45.
Li Pengchuan. Production status and development trend of heavy aviation die forging[J]. Heavy Casting and Forging, 2011(2): 39-45.
[3]黄乾尧, 李汉康. 高温合金[M]. 北京: 冶金工业出版社, 2000.
[4]梁永纯, 袁超, 郭建亭, 等. 长期时效对GH4698合金组织和性能的影响[C]//中国金属学会高温材料分会. 动力与能源用高温结构材料论文集——第十一届中国高温合金年会论文集. 北京: 冶金工业出版社, 2007: 4.
[5]林鹏, 马党参, 孙立国, 等. 热处理对热锻模材料GH4698组织和性能的影响[J]. 材料热处理学报, 2021, 42(3): 94-103.
Lin Peng, Ma Dangshen, Sun Liguo, et al. Effect of heat treatment on microstructure and properties of hot forging die material GH4698[J]. Transactions of Materials and Heat Treatment, 2021, 42(3): 94-103.
[6]秦鹤勇, 王卫红, 吴兰福, 等. 燃气轮机用GH4698合金φ1200 mm涡轮盘热处理研究[C]//中国金属学会高温材料分会. 动力与能源用高温结构材料——第十一届中国高温合金年会论文集. 北京: 冶金工业出版社, 2007: 4.
[7]秦鹤勇, 焦兰英, 张北江, 等. GH4698合金的热处理制度[J]. 钢铁研究学报, 2007, 19(2): 39-42, 51.
Qin Heyong, Jiao Lanying, Zhang Beijiang, et al. Heat treatment of superalloy GH4698[J]. Journal of Iron and Steel Research, 2007, 19(2): 39-42, 51.
[8]满蛟, 丛涛, 孙福民, 等. GH4698合金的热处理[J]. 金属热处理, 2014, 39(11): 114-116.Man Jiao, Cong Tao, Sun Fumin, et al. Heat treatment of GH4698 alloy[J]. Heat Treatment of Metals, 2014, 39(11): 114-116.
[9]赵义瀚, 彭建强, 张小伍, 等. 固溶时间对GH4698合金组织与性能的影响[J]. 金属热处理, 2016, 41(8): 4.
Zhao Yihan, Peng Jianqiang, Zhang Xiaowu, et al. Effect of solution holding time on microstructure and mechanical properties of GH4698 superalloy[J]. Heat Treatment of Metals, 2016, 41(8): 4.
[10]Chang Keh-Minn, Liu Xingbo. Effect of γ′ content on the mechanical behavior of the WASPALOY alloy system[J]. Materials Science and Engineering A, 2001, 308(1/2): 1-8.
[11]李海柱. GH4698合金热加工过程晶粒及晶界特征演变[D]. 秦皇岛: 燕山大学, 2022.
Li Haizhu. Evolution of grain and grain boundary character of GH4698 alloy during hot working[D]. Qinhuangdao: Yanshan University, 2022.
[12]Singh A R P, Nag S, Chattopadhyay S, et al. Mechanisms related to different generations of γ′ precipitation during continuous cooling of a nickel base superalloy[J]. Acta Materialia, 2013, 61(1): 280-293.
[13]Jiang He, Yang Liang, Dong Jianxin, et al. The recrystallization model and microstructure prediction of alloy 690 during hot deformation[J]. Materials and Design, 2016, 104: 162-173.
[14]Sims C T, Stoloff N S, Hangel W. Superalloy[M]. New York: Wiley, 1987.
[15]Furrer D. Fecht H. Ni-based superalloys for turbine discs[J]. JOM- the Journal of the Minerals Metals and Materials Society, 1999, 51(2): 14-17.
[16]郭淑玲. 热加工历程对GH4698显微组织的影响[D]. 秦皇岛: 燕山大学, 2021.
Guo Shuling. Effect of hot working process on microstructure of GH4698[D]. Qinhuangdao: Yanshan University, 2021.