热处理对GH4169脉冲TIG焊接接头组织和性能的影响

Effects of Heat Treatment on Microstructure and Mechanical Properties of GH4169 pulse Tig welding joint

摘要:

采用脉冲TIG焊制备GH4169合金焊接接头，并采用4种热处理工艺对焊接接头进行热处理，对比不同热处理工艺对GH4169合金焊接接头组织和性能的影响。结果表明，焊接接头经过4种热处理工艺后，部分相发生溶解，接头常温和高温抗拉强度皆得到提高，接头硬度皆显著提高，但热处理后接头塑性显著降低。其中经过1020℃固溶处理+双级时效后的接头焊缝中Laves相发生部分溶解，且经该热处理工艺后其接头常温和高温抗拉强度提高幅度皆达到最大。

Abstract:

four different heat treatment processes were used to heat treat the welded joints,which were prepared by the pulse Tig welding. We compared the unheated joint and the joints under four different heat treatments on microstructure and mechanical Properties. The results show that after four kinds of heat treatment processes, some phases dissolve, the joint tensile strength at room temperature and high temperature is improved, and the joint hardness is significantly increased, but the joint plasticity is significantly reduced after heat treatment. Among them, after 1020℃ solution treatment + two-stage aging, the Laves phase in the joint weld partially dissolved, and the tensile strength of the joint at room temperature and high temperature increased to the maximum.