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采用热丝TIG焊和手工TIG焊分别对617B合金进行焊接工艺试验,对焊接接头进行拉伸、弯曲和硬度试验,并利用光学显微镜分析了焊接接头的微观组织.结果表明:617B合金焊接接头的延展性能良好,焊接接头力学性能和硬度值均在理想范围内;焊接接头母材和热影响区组织为单一奥氏体,并且热影响区热稳定性较好,靠近熔合区的晶粒未发现长大现象,整个热影响区宽度较窄;焊缝组织为典型的胞状枝晶形态.控制层间温度和工艺参数可成功将617B合金应用到700℃关键部件验证试验平台上,且不需要焊后热处理.
The hot-wire TIG welding and manual TIG welding were respectively used to test the welding process of 617B alloy, the tensile, flexural and hardness tests of the welded joint were carried out, and the microstructure of the welded joint was analyzed by optical microscope.The results showed that the microstructure of the 617B alloy welded joint Ductility is good, the mechanical properties and hardness of the welded joint are within the ideal range; the base metal of the welded joint and the HAZ are single austenite, and the thermal stability of the heat affected zone is good, and the grains near the fusion zone are not found And the width of the whole heat-affected zone (HAZ) is narrow, and the weld microstructure is typical dendritic dendritic morphology. The control of interlayer temperature and process parameters can successfully apply 617B alloy to the 700 ℃ key component verification test platform without welding After heat treatment.