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OALib Journal期刊
ISSN: 2333-9721
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单晶DD3与细晶GH4169高温合金摩擦焊接界面表征*
DOI: 10.11900/0412.1961.2014.00686, PP. 951-956
Keywords: 单晶高温合金,高温合金,摩擦焊,连接机理,共有晶粒
Abstract:
采用SEM,TEM及EDS对制造焊接式整体涡轮叶盘所用的单晶DD3与细晶GH4169高温合金摩擦焊接界面进行了研究.结果表明,焊合区存在一条以GH4169合金为主的摩擦变形带,两侧单晶和细晶合金的热力影响区均形成了动态再结晶晶粒;连接界面处于两侧合金的动态再结晶晶粒之间,通过连接界面上的共有晶粒和共有晶界实现了两侧合金的连接;成分过渡主要发生在连接界面处的共有晶粒内和共有晶界处.TEM分析位置的共有晶粒(C2)与相邻GH4169动态再结晶晶粒(C3)具有特殊的取向关系[1ˉ14]C2∥[1ˉ10]C3和(220)C2∥(220)C3;在摩擦焊热循环及焊后热处理作用下,共有晶粒、两侧动态再结晶晶粒都存在g'相析出,g'相呈细小的球形分布,并与g基体共格,但未发现有g"相析出.
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