纯镍与304不锈钢激光异种焊接的工艺及其接头的组织性能
发布时间：2018-12-08 17:11
【摘要】：采用高密度Nd:YAG固态连续激光器对N6纯镍和304奥氏体不锈钢进行了焊接工艺实验,探究了激光功率和离焦量对焊缝成形的影响。对接头进行了拉伸强度和硬度的测试,并结合光学显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)等手段分析了接头的微观组织。结果表明:N6纯镍一侧热影响区晶粒长大明显,焊缝区靠近两侧熔合线附近为向焊缝中心区域生长的柱状晶,焊缝中心区域存在细小的胞晶区域;N6热影响区的显微硬度最低,焊缝的显微硬度介于N6镍母材和304不锈钢母材之间;接头拉伸断裂位置在焊缝区,抗拉强度达到N6纯镍母材的90%以上,可以满足实际情况下的使用要求。拉伸断口表现为准解理断裂。
[Abstract]:The welding process of N6 pure nickel and 304 austenitic stainless steel was studied by high density Nd:YAG solid-state CW laser. The effects of laser power and defocus on weld formation were investigated. The tensile strength and hardness of the joint were tested, and the microstructure of the joint was analyzed by means of optical microscope, (OM), scanning electron microscope, (SEM), energy spectrum analyzer (EDS) and so on. The results show that the grain size of the heat affected zone on the side of N6 pure nickel is obvious. Near the fusion line of both sides there are columnar crystals growing towards the center of the weld and there are small cellular regions in the center of the weld. The microhardness of N6 heat affected zone is the lowest, and the microhardness of weld is between N6 nickel base metal and 304 stainless steel base metal. The tensile fracture position of the joint is in the weld zone, and the tensile strength is more than 90% of that of the N6 pure nickel base metal, which can meet the practical requirements. Tensile fracture shows quasi-cleavage fracture.
【作者单位】： 中国科学院力学研究所;中国科学院大学工程科学学院;
【基金】：国家自然科学基金(11272317,11502269)
【分类号】：TG456.7
[Abstract]:The welding process of N6 pure nickel and 304 austenitic stainless steel was studied by high density Nd:YAG solid-state CW laser. The effects of laser power and defocus on weld formation were investigated. The tensile strength and hardness of the joint were tested, and the microstructure of the joint was analyzed by means of optical microscope, (OM), scanning electron microscope, (SEM), energy spectrum analyzer (EDS) and so on. The results show that the grain size of the heat affected zone on the side of N6 pure nickel is obvious. Near the fusion line of both sides there are columnar crystals growing towards the center of the weld and there are small cellular regions in the center of the weld. The microhardness of N6 heat affected zone is the lowest, and the microhardness of weld is between N6 nickel base metal and 304 stainless steel base metal. The tensile fracture position of the joint is in the weld zone, and the tensile strength is more than 90% of that of the N6 pure nickel base metal, which can meet the practical requirements. Tensile fracture shows quasi-cleavage fracture.
【作者单位】： 中国科学院力学研究所;中国科学院大学工程科学学院;
【基金】：国家自然科学基金(11272317,11502269)
【分类号】：TG456.7
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