CuCoCrFeNi高熵合金薄板脉冲激光焊接接头裂纹分析
发布时间：2019-02-15 15:24
【摘要】：采用Nd:YAG脉冲激光焊机对CuCoCrFeNi高熵合金薄板进行焊接,使用激光共聚焦显微镜、扫描电镜等分析了接头的微观组织、化学成分和裂纹形成原因,并对接头的显微硬度进行了测试。结果表明,在脉冲激光焊接作用下,焊缝中心出现贯穿性裂纹和分叉裂纹,熔合线处出现液化裂纹。通过改变焊接工艺参数,采取双面焊及预热等措施都无法避免裂纹的产生。焊缝组织由胞状晶和等轴晶组成,晶粒与母材相比明显细化。在断裂位置处Cu元素含量约为其他元素含量的3倍,表明断裂与晶界处含Cu固溶体的富集程度有关。熔合线附近的硬度和母材硬度相当,均低于焊缝中心区硬度。
[Abstract]:The Nd:YAG pulsed laser welding machine was used to weld the CuCoCrFeNi high entropy alloy sheet. The microstructure, chemical composition and crack formation of the joint were analyzed by laser confocal microscope and scanning electron microscope. The microhardness of the joint was tested. The results show that the penetration crack and bifurcation crack appear in the center of the weld under the action of pulsed laser welding, and the liquefaction crack occurs at the fusion line. By changing the welding process parameters and taking measures such as double side welding and preheating, cracks can not be avoided. The microstructure of the weld is composed of cellular crystal and equiaxed crystal, and the grain size is finer than that of the base metal. The content of Cu element at the fault location is about 3 times of that of other elements, indicating that the fault is related to the enrichment of Cu solid solution at grain boundary. The hardness near the fusion line is similar to that of the base metal and is lower than that in the center of weld.
【作者单位】： 沈阳理工大学材料科学与工程学院;中科院沈阳金属研究所;
【基金】：国家重点基础研究发展计划(973计划) 资助项目(2011CB610405)
【分类号】：TG456.7
[Abstract]:The Nd:YAG pulsed laser welding machine was used to weld the CuCoCrFeNi high entropy alloy sheet. The microstructure, chemical composition and crack formation of the joint were analyzed by laser confocal microscope and scanning electron microscope. The microhardness of the joint was tested. The results show that the penetration crack and bifurcation crack appear in the center of the weld under the action of pulsed laser welding, and the liquefaction crack occurs at the fusion line. By changing the welding process parameters and taking measures such as double side welding and preheating, cracks can not be avoided. The microstructure of the weld is composed of cellular crystal and equiaxed crystal, and the grain size is finer than that of the base metal. The content of Cu element at the fault location is about 3 times of that of other elements, indicating that the fault is related to the enrichment of Cu solid solution at grain boundary. The hardness near the fusion line is similar to that of the base metal and is lower than that in the center of weld.
【作者单位】： 沈阳理工大学材料科学与工程学院;中科院沈阳金属研究所;
【基金】：国家重点基础研究发展计划(973计划) 资助项目(2011CB610405)
【分类号】：TG456.7
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