低膨胀高温合金GH783电子束焊接头组织及性能研究  

Microstructures and mechanical properties of electron beam welded joint of low expansion superalloy GH783

作　　者：周标[1] 郭绍庆[1] 刘文慧[1] 李能[1] 余槐[1] 袁鸿[1] 

机构地区：[1]北京航空材料研究院焊接及锻压工艺研究室,100095

出　　处：《焊接》2010年第7期38-42,共5页Welding & Joining

摘　　要：采用电子束焊接的方法焊接GH783合金,焊缝枝晶间偏析生成Laves/γ相共晶,1 121℃固溶处理后大部分Laves/γ相消除,β相在枝晶间析出,标准热处理后β相的数量增加,γ’相在基体中弥散析出。焊接接头的硬度分布较为均匀,焊缝中的γ-γ’-β三相组织保证了接头的力学性能,使接头的室温抗拉强度比母材略高,650℃的抗拉强度与塑性均高于母材,750℃的抗拉强度和塑性与母材接近,接头同时具有优良的持久性能。The electron beam welding of GH783 alloy was studied in this paper. Laves/γ phases form in the interdendritic grain boundary regions of the weld metals as a result of segregation. Solution treatment of the welds at 1 121 ℃ results in homogenization of the Laves/γ/phases and the formation of β phases in the interdendritie regions. After full thermal treatment, the amount of 13 phase increases and γ' phases precipitate in the γ matrix. The hardness of the overall joint is relatively uniform. The mechanical properties of the joint are good,which is attributed to the γ-γ'-β three-phase morphology. The joint tensile strength at room temperature is slightly higher than that of the base metal, and the joint tensile strength and plasticity is better than that of the base metal at 650℃,and close to that of base metal at 750℃. The tensile ductility of the joint is also satisfactory.

关 键 词：GH783合金 电子束焊 显微组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]