激光快速成形粉末高温合金的力学性能研究  

Study on Mechanical Properties of Superalloy by Laser Rapid Forming

作　　者：陈静[1] 赵晓明[1] 杨海欧[1] 冯莉萍[1] 林鑫[1] 黄卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第9期1664-1668,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50331010);西北工业大学英才培养计划(05XE0131)资助

摘　　要：对激光快速成形粉末高温合金的组织和性能进行了研究。结果表明,激光快速成形沉积态组织中γ′沉淀相的析出受到抑制,γ′沉淀相在γ基体中的体积分数小,γ′相的平均尺寸显著细化。在热处理制度为1165℃固溶2h空冷+760℃时效16h空冷的基础上,适当延长时效时间将有助于细小γ′沉淀相的长大,使固溶时效态组织的抗拉强度提高到P/M+HIP标准的89%,屈服强度已经接近粉末冶金水平,显示出较好的强化效果。The microstructure and mechanical properties of superalloy by laser rapid forming（LRF） from powder have been investigated in the paper. The results show that the precipitation of γ＇ is restrained during the LRF process, which is displayed that the volume fraction of γ＇ precipitation is small and the average sizes of γ＇ fine remarkably. It has been found that prolonging aging time is help to the grow up of tiny γ＇ on the basis of heat treatment process（1165 ℃, 2 h/SQ＋760 ℃, 16 h/AC）. As a result, the ultimate strength of the sample with solution-aging microstructure reached 89% of that by P/M＋HIP process, and the yield strength approaches to the value obtained by P/M＋HIP.

关 键 词：高温合金 激光快速成形 力学性能 显微组织 γ’沉淀相 固溶时效 

分 类 号：TF124.3[冶金工程—粉末冶金]