50mm厚SA508Gr.3Cl.2钢超窄间隙激光填丝焊接头组织与性能
发布时间：2018-09-14 10:40
【摘要】：采用超窄间隙坡口和光纤激光填丝多层焊工艺,焊接了50mm厚的SA508Gr.3Cl.2核电用钢,测试并分析了接头的微观组织和性能。结果表明,焊接接头无宏观缺陷;热处理后接头中部焊缝中心组织主要为上贝氏体和针状下贝氏体,母材侧热影响区的粗晶区组织为高温回火马氏体,硬度为280HV。焊接接头拉伸试样的拉伸断裂位置均位于母材,接头抗拉性能良好。接头上、中、下部位的焊缝冲击韧性均小于母材的,但焊缝冲击试样的断口形貌仍具有一定的韧性断裂特征。
[Abstract]:The ultra-narrow gap groove and fiber laser wire filling multilayer welding process were used to weld the 50mm thick SA508Gr.3Cl.2 nuclear power steel. The microstructure and properties of the joints were tested and analyzed. The results show that there is no macroscopic defect in the welded joint, the central microstructure of the weld is mainly upper bainite and acicular lower bainite after heat treatment, the coarse grain structure of the heat affected zone of the base metal side is high temperature tempered martensite, and the hardness is 280 HV. The tensile fracture locations of the welded joint tensile specimens are all located in the base metal, and the tensile properties of the joints are good. The impact toughness of weld in the upper, middle and lower parts of the joint is smaller than that of the base metal, but the fracture morphology of the weld impact specimen still has some ductile fracture characteristics.
【作者单位】： 上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室;上海电气核电设备有限公司;高新船舶与深海开发装备协同创新中心;
【基金】：国家科技重大专项(2014ZX06002001) 上海市重大技术装备研制专项(ZB-ZBYZ-03-11-0485)
【分类号】：TG456.7
[Abstract]:The ultra-narrow gap groove and fiber laser wire filling multilayer welding process were used to weld the 50mm thick SA508Gr.3Cl.2 nuclear power steel. The microstructure and properties of the joints were tested and analyzed. The results show that there is no macroscopic defect in the welded joint, the central microstructure of the weld is mainly upper bainite and acicular lower bainite after heat treatment, the coarse grain structure of the heat affected zone of the base metal side is high temperature tempered martensite, and the hardness is 280 HV. The tensile fracture locations of the welded joint tensile specimens are all located in the base metal, and the tensile properties of the joints are good. The impact toughness of weld in the upper, middle and lower parts of the joint is smaller than that of the base metal, but the fracture morphology of the weld impact specimen still has some ductile fracture characteristics.
【作者单位】： 上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室;上海电气核电设备有限公司;高新船舶与深海开发装备协同创新中心;
【基金】：国家科技重大专项(2014ZX06002001) 上海市重大技术装备研制专项(ZB-ZBYZ-03-11-0485)
【分类号】：TG456.7
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