激光熔化沉积修复GH4169合金的组织与拉伸性能  

Microstructure and tensile property of laser melting deposited GH4169 alloy

作　　者：刘彦涛[1] 宫新勇[1] 赵霄昊 曹晔[1] 张永忠[1] 

机构地区：[1]北京有色金属研究总院复合材料中心,北京100088

出　　处：《金属热处理》2015年第2期91-98,共8页Heat Treatment of Metals

基　　金：国家重点基础研究发展计划(973计划)(2011CB606305)

摘　　要：通过激光熔化同步输送的GH4169合金粉末,在锻态GH4169合金基板上沉积出薄壁试样,分析了GH4169合金的微观组织、相组成,测试了拉伸性能。结果表明,所制备试样的沉积层和界面组织致密、无缺陷;激光沉积态组织为沿沉积高度方向生长的柱状枝晶组织,沉积态组织经过直接时效(DA)或固溶+时效(STA)处理后,枝晶间Laves相含量基本没有变化,经过均匀化+固溶+时效(HSTA)处理后,组织向等轴晶转变,Laves相含量减少;试样经过STA处理后,抗拉强度最高,达到锻态的84.5%,断后伸长率为锻态的96.7%,原始沉积态试样断后伸长率最高,高于锻态101.7%。Thin wall samples of GH4169 alloy were deposited on forged GH4169 alloy substrate by laser melting deposition of synchronously fed GH4169 metallic powders. Microstructure and phase composition of deposited GH4169 alloy were analyzed, and tensile properties were tested. The results show that the deposited material and interface region are fully dense and defect-free. The microstrueture of as-deposited material is columnar dendritic along the build-up direction. The content of Laves phase between the dendrites region does not change essentially after direct aging（DA） or solid solution and aging（STA） treatment, while the microstructure transits to equiaxed grain and Laves phase decreases after homogenization and solid solution and aging （ HSTA ） treatment. The specimen after STA treatment has the highest tensile strength, reaching 84. 5% of the forged state, and elongation reaching 96. 7%. The as-deposited specimen has the highest elongation, which is 101.7% higher than that of the forged state.

关 键 词：激光熔化沉积修复 GH4169合金 界面 显微组织 拉伸性能 

分 类 号：TN249[电子电信—物理电子学] TF124[冶金工程—粉末冶金]