激光能量密度对SLM成形TA15合金孔隙及力学性能的影响  

Effect of Laser Energy Density on the Porosity and Mechanical Properties of SLM Formed TA15 Alloy

作　　者：杨来侠[1] 慎松 戴杰 谢启东 王晨霖 李庆宇 陈祯 Yang Laixia;Shen Song;Dai Jie;Xie Qidong;Wang Chenlin;Li Qingyu;Chen Zhen(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,Shaanci,China;College of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanci,China;China Aviation Development Power Corporation,Xi'an 710049,Shaanzi,China;National Institute Corporation of Additive Manufacturing,Xi'an 710018,Shaanzi,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]西安交通大学机械工程学院,陕西西安710049 [3]中国航发动力股份有限公司,陕西西安710021 [4]西安增材制造国家研究院有限公司,陕西西安710018

出　　处：《应用激光》2025年第1期36-45,共10页Applied Laser

基　　金：陕西省教育厅2022年度服务地方专项科研计划项目(22JC053);陕西省教育科学“十四五”规划2021年度课题(SGH21Y0522)。

摘　　要：针对激光选区熔化技术(SLM)制造TA15(Ti-6.5Al-2Zr-Mo-V)零件存在孔隙的问题,采用不同激光功率及扫描速度制备TA15试样,通过对比不同体能量密度下孔隙的微观形貌,揭示了体能量密度对孔隙形成的影响规律,通过分析Schmid因子及断口形貌,建立了体能量密度、孔隙、力学性能之间的关系。实验结果表明:试样的致密度和力学性能随着体能量密度的增大呈先增大后减小的变化趋势。在100~125 J/cm^(3)之间制造TA15试样的致密度最高(≥99.9%),此时的抗拉强度为1189 MPa±22 MPa,屈服强度为871.22 MPa±18 MPa,延伸率为7.42%±1.2%。体能量密度≤100 J/cm^(3),小孔隙彼此相互连接形成区域性不规则孔隙链,这类孔隙链是恶化试件力学性能的主要原因;体能量密度≥125 J/cm^(3),形成独立零散分布的球形气孔。减少孔隙可以提升SLM制造TA15零件的力学性能,使其应用范围更广。This study investigates the defects in TA15(Ti-6.5Al-2Zr-Mo-V)components produced by selective laser melting(SLM).TA15 samples were fabricated using varying laser powers and scanning speeds to examine the influence of volume energy density on pore and crack formation.The microscopic morphology of pores at different energy densities was analyzed,and the relationship between energy density and mechanical properties was determined through fracture morphology analysis.Results indicate that specimen density and mechanical properties initially increase with volume energy density before decreasing.The highest relative density(≥99.9%)for SLM-fabricated TA15 specimens was achieved at 100—125 J/cm^(3),corresponding to a tensile strength of 1189 MPa±22 MPa,yield strength of 871.22 MPa±18 MPa,and elongation of 7.42%±1.2%.At volume energy densities≤100 J/cm^(3),interconnected small pores form regional irregular pore chains,negatively affecting mechanical properties.Above 125 J/cm^(3),pores are independently scattered and spherical,suggesting that pore reduction enhances the mechanical properties of SLM-produced TA15 parts,broadening their application potential.

关 键 词：激光选区熔化 TA15合金 致密度 孔隙 

分 类 号：TG146.23[一般工业技术—材料科学与工程]