激光与光电子学进展, 2015, 52 (10): 101402, 网络出版: 2015-10-08
相同激光线能量对焊缝组织和性能的影响 下载: 501次
Influence of Laser with Same Line Energy on the Microstructure and Properties of welded
光学制造 激光焊接 线能量 形貌 组织和性能 optical fabrication laser welding line energy appearance microstructure and property
摘要
在相同线能量条件下对E36 高强钢和304 奥氏体不锈钢进行了激光对焊。采用光学显微镜(OM)、扫描电镜(SEM)、X 射线仪(XRD)对焊接接头的形貌,金相组织进行了分析,并对焊缝的显微硬度和抗拉强度进行了评价。结果表明:焊接线能量和激光功率密度同时对焊接接头的宏观形貌起着决定性作用。焊接速度对焊接接头的微观晶粒形态影响较大。焊缝主要是由马氏体组织和少量碳化物组成。304 侧熔合区的组织主要是由奥氏体和少量δ -铁素体组成,E36 侧热影响区生成了板条马氏体、贝氏体和铁素体组织。激光功率为1 kW 时,焊缝硬度较其他条件低且拉伸试样在焊缝处断裂,而其他试样均在E36 基体上断裂。
Abstract
High-strength steel E36 and stainless steel 304 are welded by laser welding with the same line energy. Microstructure and fracture morphology of welded joint are investigated by means of optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the mechanical properties of the weld are evaluated by micro-hardness and tensile strength testing. The results show that both heat input and laser power density play a crucial role in macro-morphology of welded joint. Welding speed has a significant impact on micro grain morphology. Weld zone is made up of martensite and some carbide particles. There are mainly austenites and a bit δ -ferrites on the 304 fusion zone while lath-shaped martensite, bainite and ferrites are produced on the heat affected zone of E36. When the laser power is 1 kW, micro-hardness of the welding seam is lower than that of the others, and the tensile specimen break occurs at the seam, while the other specimens occur at the side of E36.
刘东宇, 李东, 李凯斌, 陈倩倩. 相同激光线能量对焊缝组织和性能的影响[J]. 激光与光电子学进展, 2015, 52(10): 101402. Liu Dongyu, Li Dong, Li Kaibin, Chen Qianqian. Influence of Laser with Same Line Energy on the Microstructure and Properties of welded[J]. Laser & Optoelectronics Progress, 2015, 52(10): 101402.