近α钛合金粉末选择性激光熔化成形研究

Selective Laser Melting Process Optimization of a New Titanium Alloy Powder

利用光学显微镜、扫描电镜等手段分析了选择性激光熔化(Selective Laser Melting,SLM)钛合金成形单道、单层及块体成形规律。采用不同激光功率与扫描速度的组合进行成形,研究了激光功率、扫描速度对单道熔池形貌及宽度的影响规律;通过单层试验,研究了扫描间距与熔池形貌的关系;通过块体试验,研究了致密度与线能量密度的关系,确定了最优工艺窗口。

In this paper,scan tracks as well as the properties of built parts were analyzed with the optical microscope （OM）and Scanning Electron Microscope （SEM）etc.Single tracks experiments were conducted on titanium alloy substrates using different laser power and scan speed to find out their influences on the width and morphology of single tracks.The optimum linear energy density for signal track were in the range of 0.28-0.7J/mm of.Multi-track experiments were performed.It was found that the optimum scan-ning space was 0.08mm.Blocks were fabricated to reveal the relation between the linear energy density and the part density.Finally the optimum parameters window was determined.