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论文类型：期刊论文

发表时间：2015-09-02

发表刊物：MATERIALS AND MANUFACTURING PROCESSES

收录刊物：SCIE、EI、Scopus

卷号：30

期号：9

页面范围：1104-1108

ISSN号：1042-6914

关键字：Steel; Intermetallic; TiAl; Heating; Welding

摘要：The effect of post-weld heat treatment (PWHT) on the mechanical properties and microstructure of direct friction-welded joint between TiAl alloy and 42CrMo steel rods was investigated in this paper. It was found that solid joint between TiAl alloy and 42CrMo steel could be obtained without adding interlayer. After PWHT at 580 degrees C for 2h, the tensile strength of the joint reached 405MPa, and fracture happened through the TiAl alloy substrate with quasi-cleavage features. The tempered sorbite formed near the interface, improving the joint strength significantly. It was found that TiFe2, TiAl, and small amount of TiC brittle phases formed at the interface, and the interfacial layer was as thin as 2-5 mu m. The precipitated phases were 1 mu m in average size, and distributed discontinuously at the interface.