GH4065A合金电子束焊接工艺及接头组织性能  

Electron Beam Welding Process and Microstructure and Properties of Joint of GH4065A Alloy

作　　者：赵桐 唐振云 刘巧沐 黄烁 张文云[3] 张北江[3] ZHAO Tong;TANG Zhenyun;LIU Qiaomu;HUANG Shuo;ZHANG Wenyun;ZHANG Beijiang(Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing 100024,China;AECC Gas Turbine Establishment,Chengdu 610500,China;High Temperature Material Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]中国航空制造技术研究院高能束流加工技术重点实验室,北京100024 [2]中国航发四川燃气涡轮研究院,成都610500 [3]钢铁研究总院高温材料研究所,北京100081

出　　处：《材料导报》2020年第22期22105-22110,共6页Materials Reports

基　　金：装备发展部预研项目重点实验室基金(61429080102)。

摘　　要：本工作研究了不同电子束焊接工艺条件下GH4065A合金的焊缝质量,探讨了焊接裂纹产生的原因,分析了双斑电子束焊接工艺抑制裂纹的机理,并针对焊接接头的显微组织以及力学性能进行了测试分析。研究发现,采用常规电子束焊接方法时GH4065A合金易开裂,而采用双斑电子束焊接工艺可有效实现GH4065A合金的连接,且焊缝质量满足HB7608-1998标准中I级要求。电子束焊接接头的焊缝区以细小的树枝晶为主,且存在Nb、Ti元素的偏析,γ′强化相从焊缝向近缝母材逐渐粗化,焊缝区与母材的组织差异是导致焊缝高温下拉伸塑性降低的主要原因。模拟结果表明,双斑电子束焊接工艺能够降低焊接过程中的能量集中程度,改善焊缝的冷却速度,从而减轻裂纹产生的倾向。经时效处理后电子束焊缝25~750℃的强度系数超过96%,750℃下焊接接头延伸率为9%,表明电子束焊接是实现GH4065A合金结构连接的一种有效方法。In this paper,the weld quality of GH4065A alloy under different electron beam welding(EBW)conditions was studied.The causes of welding cracks and the mechanism of crack suppression by double-spot EBW were discussed.The microstructure and mechanical properties of the welded joint were tested and analyzed.It was found that the double-spot EBW can effectively connect GH4065A alloy,and the weld quality can meet the requirements of grade I in HB7608-1998.However,the conventional EBW was easy to crack.The results showed that the weld zone(WZ)of the EBW joint was dominated by dendrites,and there was segregation of Nb and Ti elements.Theγ′strengthening phase gradually coarsened from the weld to the matrix.The difference of microstructure between the WZ and the matrix was the main reason for the reduction of tensile plasticity at high temperature.The simulation results showed that the double-spot EBW can reduce the energy concentration in the welding process,improve the cooling speed of the weld,and reduce the tendency of cracking.After aging treatment,the strength coefficient of welded joint at 25—750℃was over 96%,and the elongation of welded joint at 750℃was 9%,indicating that EBW was an effective joining method of GH4065A alloy structure.

关 键 词：GH4065A合金 电子束焊接 焊缝 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]