C对MGH956合金TIG原位合金化焊接的影响  

Effect of C on TIG In-situ Alloying Welding of MGH956 Alloy

作　　者：任丹[1] 雷玉成[1,2] 刘发强[1] 李猛刚[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏省高端结构材料重点实验室,江苏镇江212013

出　　处：《材料工程》2014年第10期40-46,共7页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51075191);江苏省高校博士创新基金项目(CXLX12-0638)

摘　　要：对MGH956合金添加自制填充粉末进行TIG原位合金化焊接，分析了TIG焊接过程中C的原位合金化机制和行为。结果表明：在TIG焊原位反应的过程中，C对N的分压作用降低了N在焊接熔池中的溶解度，从而消除了氮气孔；同时焊接熔池中的C与Ti通过相关机制生成了50～100nm的TiC颗粒，并均匀分布在焊缝中。因此当填充材料中含有适量的C进行焊接时，不仅可以细化晶粒，同时能够显著提高焊缝的力学性能，从而改善焊接接头的综合性能。MGH956 alloy was welded by TIG in-situ alloying welding with homemade filler material. The in-situ alloying mechanism and behavior of C in the TIG welding process were mainly analyzed. The results show that the partial pressure effect of C to N can reduce the solubility of N in the welding pool. This eliminates the nitrogen porosity in welding process. TiC particles with the size of 50-100 nm form and distribute uniformly in the weld. Addition of moderate C to filler material can refine the grains size and improve the mechanical properties of weld. Thus the comprehensive properties of the weld are improved.

关 键 词：ODS合金 TIG 原位反应 C 

分 类 号：TG422.3[金属学及工艺—焊接]