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.
作者
白云瑞
胡钰昊
钟燕
郭会明
李福林
付锐
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)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第6期108-113,共6页
Heat Treatment of Metals
关键词
GH4096合金
热暴露
组织演化
GH4096 alloy
thermal exposure
microstructure evolution
作者简介
白云瑞(1989-),男,工程师,主要研究方向为发动机材料的应用,E-mail:747300632@qq.com。
