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Microstructure and mechanical properties of friction welds between TiA l alloy and 40Cr steel rods 被引量:4

TiAl合金/40Cr钢摩擦焊接头的组织与力学性能(英文)
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摘要 Direct friction welding of Ti Al alloy to 40 Cr steel rods was conducted, and the microstructure and mechanical properties of the resultant joints in as-welded and post-weld heat treatment(PWHT) states were investigated. The martensitic transformation occurred and brittle Ti C phase formed near the interface due to C agglomeration, which degraded the joint strength and increased the microhardness at the interface in as-welded state. Feathery and Widmanstatten structure generated near the interface on Ti Al alloy side. After PWHT at 580 °C and 630 °C for 2 h, the sorbite formed and C dispersed at the interface, leading to the increase of the joint strength from 86 MPa in as-welded state to 395 MPa and 330 MPa, respectively. The heat-treated specimen fractured with quasi-cleavage features through the zone 1 mm away from the interface on TiA l alloy side, but the as-welded specimen failed through the interface. 讨论了焊后热处理对Ti Al合金与40Cr热轧钢摩擦焊接头显微组织及力学性能的影响。焊态下,钢侧界面层附近发生马氏体转变,界面层中碳原子富集生成Ti C,降低了接头的力学性能;Ti Al合金侧形成了羽毛状及魏氏体组织。经580°C和630°C保温2 h焊后热处理,界面层附近形成回火索氏体组织,碳弥散分布,接头的抗拉强度由焊态时的86 MPa分别提高至395 MPa和330 MPa。焊态下,接头沿界面层断裂;热处理后,接头呈准解理断裂,断裂位置位于Ti Al合金侧,距界面层约1 mm。
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3126-3133,共8页 中国有色金属学报(英文版)
基金 Project(51374048)supported by the National Natural Science Foundation of China Project(2011CB013402)supported by the National Basic Research Program of China Project(AWPT-Z01)supported by the State Key Laboratory of Advanced Welding and Joining,China
关键词 TiAl alloy STEEL dissimilar metal joining friction welding post-weld heat treatment TiAl合金 异种金属焊接 摩擦焊 焊后热处理
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