基于TA15电弧熔丝制件的激光沉积连接力学性能研究

Research on Mechanical Properties of Laser Deposition Connection Based on TA15 Titanium Alloy Arc Additive Parts

对TA15电弧熔丝制件的激光沉积连接件的拉伸性能和疲劳性能进行研究。通过对比不同线能量密度参数下拉伸试验数据,获得该工艺组合下成形连接的近优工艺参数激光功率1200 W、扫描速度800 mm/s、光斑直径3 mm。优参下进行增材激光沉积连接,获得连接接头的拉伸性能抗拉强度933 MPa、屈服强度861.7 MPa、断后伸长率5.5%,疲劳极限482 MPa。同时,根据连接件性能数据、断口位置,分析连接工艺、热处理制度等对连接接头性能的影响规律,获得异质材料连接接头的断后伸长率无法真实反应其塑性等结论。以上研究成果为未来依靠集成增材制造技术,实现飞机大型整体结构制备奠定了研究基础。

This article investigates the tensile and fatigue properties of laser deposition connectors or TA15 arc fused parts.By comparing the tensile testing data under different linear energy density parameters,the near optimal process parameters of forming connection under this process combination are:laser power 1200 W,scanning speed 800 mm∕s,and spot diameter 3 mm.The tensile properties of the joint obtained by laser deposition bonding with additive under the optimal parameters are:tensile strength 933 MPa,yield strength 861.7 MPa,elongation after fracture 5.5%,and fatigue limit 482 MPa.At the same time,based on the performance data and fracture location of the connecting parts,the influence of connection process,heat treatment system,and other factors on the performance of the connecting joint is analyzed,and the conclusion is drawn that the elongation after fracture of the heterogeneous material connecting joint cannot truly reflect its plasticity.The above research results have laid a research foundation for the future implementation of large-scale integrated aircraft structure preparation relying on integrated additive manufacturing technology.