时效工艺对GH4169合金弹簧丝微观组织及力学性能的影响  

Effects of Aging Process on Microstructure and Mechanical Properties of GH4169 Alloy Spring Wire

作　　者：李维 高丙爽 翟心语 胥春燕[1] 于耀华 刘威 张喆 LI Wei;GAO Bingshuang;ZHAI Xinyu;XU Chunyan;YU Yaohua;LIU Wei;ZHANG Zhe(Key Laboratory of Reactor System Design Technology,Nuclear Power Institute of China,Chengdu 610213,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Shanghai No.1 Machinetool Works Co.,Ltd.,Shanghai 201306,China;Jiangsu Xinhua Alloy Co.,Ltd.,Xinghua 225722,China)

机构地区：[1]中国核动力研究设计院反应堆系统设计技术重点实验室,四川成都610213 [2]天津大学化工学院,天津300350 [3]上海第一机床厂有限公司,上海201306 [4]江苏新华合金有限公司,江苏兴化225722

出　　处：《热加工工艺》2021年第16期126-130,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(52075368)。

摘　　要：镍基高温合金制弹簧构件在航空航天和核电领域被广泛使用。研究了时效工艺对GH4169合金弹簧丝的微观组织结构以及室温和高温下的力学性能的影响。结果表明,随着时效温度的升高,碳化物的含量和γ’相的尺寸逐渐增加。合金经670℃×8 h,以50℃/h速率冷却至570℃,8 h AC时效后GH4169合金弹簧丝剪切强度可以达到1450MPa。当时效温度达到720℃时,δ相开始在晶界处析出。当温度继续升高后,δ相的含量逐渐增加,δ相周围的γ’相溶解。因此GH4169合金弹簧丝的γ’相含量降低,硬度和剪切强度下降。此外,随着温度的上升,GH4169合金弹簧丝的剪切强度和塑性同时降低。The spring-making components of nickel-based superalloy were widely used in the fields of aerospace and nuclear power. The effects of aging process on the microstructure and mechanical properties at room temperature and high temperature of GH4169 alloy spring wires were investigated. The results show that the volume fraction of carbides and size ofγ’ phase increase with an increase of aging treatment temperature. Shear strength of the spring wire aged by 670 ℃ for 8 h, 50℃/h cool+570 ℃ for 8 h, AC is 1450 MPa. However, δ phase appears at gain boundaries as the temperature increases to720℃. The volume of δ phase increases with increasing temperature, while the γ’ phase tends to dissolve in the vicinity of δphase. Therefore, both hardness and shear strength of GH4169 alloy spring wires decrease gradually due to the lack of γ’phase. Moreover, both the shear strength and ductility decrease simultaneously with increasing applied temperature.

关 键 词：GH4169合金弹簧丝 时效工艺 微观组织 剪切强度 

分 类 号：TG156.9[金属学及工艺—热处理] TG146.15[金属学及工艺—金属学]