摘要:
采用高频感应加热的方式,在Ar气保护条件下,用Ag-Cu-Ti钎料实现了TiAl基合金与40Cr钢的钎焊连接;采用扫描电镜、电子探针、X射线衍射分析等手段对断口、界面、生成相进行了分析,并且测试了接头的抗拉强度。结果表明,在界面上有Ti(CuAl)2、Ag[s,s]、TiC等反应相生成,典型接头界面结构为TiAl/Ti(CuAl)2+Ag[s,s]/Ag[s,s]/TiC/40Cr);断裂位置及接头的抗拉强度随保温时间而变化;当钎焊连接温度为1143 K,保温时间0.9 ks时接头抗拉强度值最高,达到298 MPa,断裂主要发生在Ti(CuAl)2层内部。
Abstract:
Induction brazing of TiAl to 40Cr under the protection of Ar gas was carried out with Ag-Cu-Ti filler metal. Fracture surface, inter facial microstructures and formation phases of brazed joints were investiga ted by means of scanning electron microscopy, electron probe microanaly sis and X-ray diffraction, and the joint strength was determined by tensile testing method. The results show that Ti(CuAl)2,Ag[s,s],TiC form in the brazing seam and the typical interface structure of brazed joints is TiAl/Ti (CuAl)2+Ag [s, s]/Ag [s, s]/TiC/40Cr. The tensile strength and fracture path of the brazed joints change with brazing time. When the joint is brazed at 1 143 K for 0.9 ks, joint tensile strength as high as 298 MPa is obtained and the fracture occurs in the Ti(CuAl)2 zone.
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