热处理对GH690-Re合金组织与性能的影响  

Effect of heat treatment on microstructure and mechanical properties of GH690-Re alloy

作　　者：周海涛[1] 钟芳华[1] 李家华[2] 邵兴明 彭勇[1] 刘瑞蕊[1] 彭谦之[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]东北大学材料冶金学院,辽宁沈阳110004 [3]江苏新华合金电器有限公司,江苏泰州225300

出　　处：《材料热处理学报》2013年第3期89-93,共5页Transactions of Materials and Heat Treatment

基　　金：国家火炬计划(2011GH30513);江苏省科技计划(SBE201000527)

摘　　要：采用金相显微镜(OM)、扫描电子显微镜(SEM)、拉伸试验机等研究了热处理对GH690-Re合金组织与性能的影响。结果表明:与热轧态组织相比,经热处理后GH690-Re合金组织有所粗化。合金的最佳热处理工艺是在1050℃固溶45 min+720℃时效9 h,组织为单相奥氏体基体+γ'析出相,晶粒大小比较均匀。室温条件下材料的抗拉强度为655 MPa,屈服强度为300MPa,合金的高强度主要来源于时效过程中从过饱和固溶体中析出的γ'相引起的析出强化。Effect of heat treatment on microstructure and mechanical properties of GH690-Re alloy were investigated by optical microscope, scanning electron microscopy（SEM） and tensile test. The results show that the microstrueture has been coarsened after heat treatment compared with that of the hot-rolled alloy. The optimal heat treatment process is solid solution treatment at 1050℃ for 45 rain and then aging at 720℃ for 9 h. The microstructure of the heat-treated alloy is single-phase austenite matrix with γ＇ precipitates and its grain size is uniform, and the tensile strength and yield strength of the studied alloy are 655 MPa and 300 MPa at room temperature, respectively. The high strength of the alloy mainly comes from the precipitatation strengthening of γ‘ phase precipitated from oversaturated solid solution during aging.

关 键 词：热处理 GH690-Re合金 显微组织 力学性能 

分 类 号：TG166.7[金属学及工艺—热处理]