Zhen Rui, Li Liqun, Gong Yunhao, Gong Jianfeng, Huang Yichen, Chang Shuai
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 15001, China.
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China.
Materials (Basel). 2024 Dec 22;17(24):6268. doi: 10.3390/ma17246268.
This investigation focuses on Selective Laser Melting (SLM)-fabricated thin-walled Ta10W alloy components. Given the inherent limitations of SLM in producing large-scale, complex components in a single operation, laser welding was investigated as a viable secondary processing method for component integration. The study addresses the critical issue of weldability in additively manufactured tantalum-tungsten alloys, which frequently exhibit internal defects due to process imperfections. Comprehensive analyses were conducted on weldability, microstructural evolution, texture intensity, and mechanical properties for welds oriented along both traveling and building directions. Results demonstrate that welds oriented along the traveling direction exhibit superior performance characteristics, including enhanced tensile strength, increased yield strength, improved elongation, and reduced texture intensity compared to building direction welds. Notably, grain orientation alignment between the weld zone and base material was observed consistently in both directional configurations.
本研究聚焦于选择性激光熔化（SLM）制造的薄壁Ta10W合金部件。鉴于SLM在单次操作中生产大规模复杂部件存在固有局限性，研究了激光焊接作为部件集成的可行二次加工方法。该研究解决了增材制造钽钨合金中可焊性这一关键问题，此类合金常因工艺缺陷而出现内部缺陷。对沿行进方向和构建方向的焊缝的可焊性、微观结构演变、织构强度和力学性能进行了全面分析。结果表明，与构建方向焊缝相比，沿行进方向的焊缝表现出更优异的性能特性，包括更高的抗拉强度、更高的屈服强度、更好的伸长率以及更低的织构强度。值得注意的是，在两种方向配置中均一致观察到焊缝区与母材之间的晶粒取向排列。
