GH4096合金在长期热暴露过程中的组织演化  

Microstructure evolution of GH4096 alloy during long-term thermal exposure

作　　者：白云瑞 胡钰昊 钟燕 郭会明 李福林[2] 付锐[2] Bai Yunrui;Hu Yuhao;Zhong Yan;Guo Huiming;Li Fulin;Fu Rui(AECC GAS Turbine Establishment,Chengdu Sichuan 610500,China;High Temperature Material Research Institute,Central Iron&Steel Research Institute,Beijing 100081,China)

机构地区：[1]中国航发四川燃气涡轮研究院,四川成都610500 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《金属热处理》2020年第6期108-113,共6页Heat Treatment of Metals

摘　　要：基于粉末冶金René88DT合金的成分,采用新型定向凝固铸锭变形工艺研制了GH4096合金,并研究了其固溶时效热处理后在700~900℃长期热暴露过程中γ’相的粗化和晶界析出相的析出行为。结果表明:GH4096合金在700℃热暴露时具有良好的组织稳定性,晶内γ’相的尺寸稳定在70 nm左右,未发现明显的长大行为,晶界上未发现析出相;750℃热暴露500 h以上时,二次γ’相开始出现聚集长大现象,晶界开始出现不连续析出相,但γ’相的长大速度和晶界析出相的析出速度均比较低;800℃以上长期热暴露时,γ’相的粗化速度和晶界析出相的析出长大速度明显加快。长期热暴露后晶内二次γ’相的尺寸与Larsen-Miller参数近似呈线性关系,晶界析出相以M3B2和μ相为主。Based on the composition of powder metallurgy René88 DT alloy,GH4096 alloy was prepared by using a new deformation process.The coarsening of the γ’phase and the precipitation behavior of the grain boundary precipitated phase in the solution treated and aged GH4096 alloy during long-term thermal exposure between 700-900℃were studied.The results show that the GH4096 alloy has good microstructure stability during thermal exposure at 700℃.The size of the intragranularγ’particles is stable at about 70 nm,and no precipitated phase is observed at the grain boundaries.The secondary γ’phases begin to grow by a coalescence process,and the discontinuous phases begin to precipitate on the grain boundaries after exposure at 750℃for 500 h,however,the growth rate of γ’phase and the precipitation rate of grain boundary precipitates are relatively low.When the exposure temperature is above 800℃,The coarsening rate of γ’phase and the precipitation and growth rate of grain boundary precipitates are obviously accelerated.After long-term thermal exposure,the relationship between the size of the secondary γ’phase and Larsen Miller parameter is approximately linear,and the main precipitates are M3 B2 and μphase.

关 键 词：GH4096合金 热暴露 组织演化 

分 类 号：TG132.3[一般工业技术—材料科学与工程]