钛铝基金属间化合物熔焊工艺性的研究进展

综述了钛铝基金属间化合物(主要是Ti3Al，TiAl)熔焊连接技术的研究现状，主要涉及电子束焊、激光焊和氩弧焊等方法，指出钛铝基金属间化合物的焊接性不存在本质上不可焊的问题。无论采用何种熔焊方法连接此类合金，焊态下焊接接头的组织和性能一般不理想，焊缝和热影响区很容易脆化。控制冷速是成功连接此类材料的关键，同时受该类材料的物理冶金学特点限制，其组织转变动力机制、氢脆、间隙元素的引入对其焊接性的影响尚未引起注意。

Research Progress in Fusion Welding Technology of Titanium Aluminide Based Intermetallic Compound

Development of research on fusion welding technology of titanium aluminide based intermetallic compounds are summarized mainly dealing with electron beam welding, laser welding and argon arc welding. The difficult weldability of titanium aluminide based alloy is pointed out. Wh ichever fusion weldng procedure is selected, ideal microstructu re and performance of the welded joints is difficult to be obtained and emb rittlement is easy to form in the weld and the heat affected zone. Controlling c ooling rate is a key factor to join this materials successfully. No enough atten tions are drawn on effect of microstructure transformation kinetics, hydrogen em brittlemen t and elements introduction on this materials weldability because of the lack of data on metallurgical studies.