中国激光, 2017, 44 (11): 1102006, 网络出版: 2017-11-17
50 mm厚SA508Gr.3Cl.2钢超窄间隙激光填丝焊接头组织与性能 下载: 811次
Microstructures and Properties of 50 mm Thick SA508Gr.3Cl.2 Steel Welding Joints by Ultra-Narrow-Gap Laser Welding with Filler Wire
激光技术 光纤激光 SA508Gr.3Cl.2钢 超窄间隙激光填丝焊接 微观组织 力学性能 laser technique fiber laser SA508Gr.3Cl.2 steel ultra-narrow-gap laser welding with filler wire microstructure mechanical properties
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50 mm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280 HV。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
By the multi-pass fiber laser welding technique with filler wire based on the ultra-narrow-gap grooves, the 50 mm thick SA508Gr.3Cl.2 nuclear power steel is welded, and the microstructures and properties of joints are tested and analyzed. The results show that there are no macro defects inside the welded joints. After heat treatment, the central organization of the welds in the middle of joints mainly consists of upper bainite and acicular lower bainite, the coarse grain area in the heat affected zone near the base material consists of high-temperature tempered martensite, and the microhardness of this area is 280 HV. The tensile fracture position of welding joints is located in the base material, which indicates that the tensile strength of joints is good. The impact toughness of the welds in the top, middle and bottom area of joints are smaller than that of the base material, but the fracture morphology of the impact specimen extracted from the welds has certain characteristics of toughness fracture.
张益文, 张茂龙, 孙志远, 黄坚, 姚成武, 金鑫. 50 mm厚SA508Gr.3Cl.2钢超窄间隙激光填丝焊接头组织与性能[J]. 中国激光, 2017, 44(11): 1102006. Zhang Yiwen, Zhang Maolong, Sun Zhiyuan, Huang Jian, Yao Chengwu, Jin Xin. Microstructures and Properties of 50 mm Thick SA508Gr.3Cl.2 Steel Welding Joints by Ultra-Narrow-Gap Laser Welding with Filler Wire[J]. Chinese Journal of Lasers, 2017, 44(11): 1102006.