K447A+GH4169惯性摩擦焊工艺试验研究

The Study of K447A+GH4169 Inertia Friction Welding Technology

本工作针对铸造高温合金K447A+变形高温合金GH_4169异质材料惯性摩擦焊接(IFW)接头的微观组织和力学性能进行分析,结果表明,K447A+GH_4169惯性摩擦焊接头飞边主要由GH_4169一侧产生;GH_4169及K447A一侧在界面近域均形成了细小再结晶区,热处理后焊缝组织中析出细小的γ′相,GH_4169一侧焊缝中δ相几乎全部溶解,热力影响区中δ相部分回溶,时效处理后无明显析出现象;界面元素浓度检测结果显示在结合界面处形成了元素扩散过渡区。GH_4169+K447A惯性摩擦焊接头的抗拉强度与K447A相当,高温持久性能测试试验时间超过75h。

The microstructure and mechanical properties in the inertia friction welded(IFW)dissimilar joints of K447A+GH4169 were studied.The results show that the flash of K447A+GH4169 IFW joint was mainly generated by GH4169.Fine recrystallization zone was formed near the friction interface on both sides of K447A and GH4169.Fineγ′phase which was precipitated dispersed in the weld zone(WZ)after heat processing.Most ofδphase in the weld zone of GH4169 side was dissolved and part ofδphase was dissolved in thermo-mechanical affected zone(TMAZ).After aging treatment,noδphase precipitation was found in the zone of TMAZ and WZ.The result of elements interdiffusion zone by electron probe microanalysis(EPMA)was observed.The tensile strength of GH4169+K447A IFW joints were equal to K447A base metal,the time of high temperature endurance testing exceeded 75 h.