中国激光, 2017, 44 (12): 1202003, 网络出版: 2017-12-11
X100管线钢光纤激光焊接头的显微组织及性能 下载: 614次
Microstructures and Properties of X100 Pipeline Steel Joints by Fiber Laser Welding
激光技术 激光焊接 微观组织 力学性能 微合金钢 laser technique laser welding microstructure mechanical properties microalloyed steel
摘要
通过激光焊接X100管线钢试验, 研究了热输入对焊接接头显微组织和硬度的影响, 并对典型的全熔透样品进行了力学性能分析。研究结果表明, 当热输入达到1.5 kJ·cm-1时, 可获得全熔透焊缝, 熔宽和热影响区的宽度分别达到1.8 mm和1.0 mm。一定范围内的热输入对焊接接头各个微区的显微组织影响不明显, 焊缝区、粗晶区和细晶区的硬度均高于母材的, 混晶区的硬度低于母材的。拉伸断裂的位置出现在母材。激光全熔透焊接接头的冲击功达到母材水平, 热影响区的冲击功达到母材的66%, 均为典型的韧性断裂。
Abstract
With the experiment of laser welding of X100 pipeline steels, the influence of heat input on the microstructure and hardness of welded joints is studied, and the mechanical properties of typical samples with full penetration are analyzed. The study results show that the full penetration welds can be obtained when the heat input reaches 1.5 kJ·cm-1 and the corresponding welding width and heat-affected zone width reach 1.8 mm and 1.0 mm, respectively. In a certain range of heat inputs, the influence of heat input on the microstructures of welded joints in each micro-area is not obvious. The microhardnesses of the weld zone, the coarse grain zone and the fine grain zone are all higher than that of the base metal, while the microhardness of the mixed zone is lower than that of the base metal. The tensile fracture occurs in the base metal. The impact energy of welded joints with full penetration reaches the level of the base metal, and the impact energy of the heat affected zone reaches 66% of that of the base metal, all of which are typical ductile fractures.
郭鹏飞, 王晓南, 朱国辉, 赵艳君, 张敏, 陈长军. X100管线钢光纤激光焊接头的显微组织及性能[J]. 中国激光, 2017, 44(12): 1202003. Guo Pengfei, Wang Xiaonan, Zhu Guohui, Zhao Yanjun, Zhang Min, Chen Changjun. Microstructures and Properties of X100 Pipeline Steel Joints by Fiber Laser Welding[J]. Chinese Journal of Lasers, 2017, 44(12): 1202003.