钛合金电子束深熔焊接头的组织及缺陷

摘要

The microstructure,phase composition and cold shut defect of thick titanium alloy electron beam welded joint were studied.The results showed that the microstructure of weld zone was composed of α' phase; the heat affected zone was divided into fine-grained zone and coarse-grained zone,the microstructure of fine-grained zone was primary α phase + β phase + equiaxed α phase,and the microstructure of coarse-grained zone was primary α phase + acicular α' phase; the microstructure of base metal zone basically consisted of primary α phase,and a small amount of residual β phase sprinkled.The forming reason of cold shut was analyzed,and the precaution of cold shut was proposed.%对大厚度钛合金电子束焊接接头的显微组织、相组成和冷隔缺陷进行研究.结果表明,焊缝区组织为马氏体α'相；热影响区由细晶区和粗晶区两部分组成,细晶区组织为初生α相+β相+等轴α相,粗晶区组织为少量的初生α相+针状α'相；母材区组织基本上都是长条状和块状的初生α相,其间分布着少量残余β相.对冷隔的形成原因进行了分析,并提出了预防措施.