粉体性能及选区激光熔化打印工艺对AlSi10Mg合金致密化行为的影响
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摘要
本研究重点探索了AlSi10Mg合金的粉体性能以及选区激光熔化(SLM)打印工艺对AlSi10Mg合金粉体致密化行为的影响。通过对两种粒度组成不同的球形AlSi10Mg合金粉体在选区激光熔化(SLM)工艺过程中致密化行为的研究,发现AlSi10Mg粉体粒度组成对SLM打印过程中的致密化程度有关键性影响:粗粉含量较高,更有利于较高致密度的SLM打印件的制备。通过选取上述两种粉体中SLM打印性能较高的AlSi10Mg粉体,采用Box-Behnken响应曲面实验设计系统探索了SLM工艺参数对打印件致密度的影响规律,获得了SLM打印工艺参数与打印件相对密度的定量关系模型。研究发现,SLM打印参数中对AlSi10Mg合金相对密度的影响程度从大到小依次为:激光功率、扫描速度、扫描间距;当激光功率为375 W、扫描速度为2 000 mm/s、扫描间距为50μm时,AlSi10Mg打印件的相对密度值可达到98.26%,抗拉强度可达487 MPa。
This study is focused on the investigation of the effects of powder properties and selective laser melting(SLM) processing parameters on densification behavior of AlSi10 Mg alloy. The densification behavior of the SLM processed samples made from two kinds of AlSi10 Mg alloy powders with different particle size distributions was studied, the results show that particle size distribution of AlSi10 Mg powder is critical to the densification behavior during SLM processing, and the higher content of coarser particles results in the higher density of SLM processed samples. By choosing the AlSi10 Mg powders with better SLM processed density, the effect of SLM processing parameters on the density was investigated by using Box-Behnken response surface methodology. A quantitative relationship model between SLM processing parameters and the relative density of SLM processed samples was obtained. It is found that among the SLM processing parameters, laser power has the most significant influence on the relative density of SLM processed samples, followed by scanning speed, and hatch space. When the laser power is 375 W, scanning speed is 2 000 mm/s, and hatch space is 50 μm, the relative density and tensile strength of AlSi10 Mg printed samples can reach 98.26% and 487 MPa, respectively.
This study is focused on the investigation of the effects of powder properties and selective laser melting(SLM) processing parameters on densification behavior of AlSi10 Mg alloy. The densification behavior of the SLM processed samples made from two kinds of AlSi10 Mg alloy powders with different particle size distributions was studied, the results show that particle size distribution of AlSi10 Mg powder is critical to the densification behavior during SLM processing, and the higher content of coarser particles results in the higher density of SLM processed samples. By choosing the AlSi10 Mg powders with better SLM processed density, the effect of SLM processing parameters on the density was investigated by using Box-Behnken response surface methodology. A quantitative relationship model between SLM processing parameters and the relative density of SLM processed samples was obtained. It is found that among the SLM processing parameters, laser power has the most significant influence on the relative density of SLM processed samples, followed by scanning speed, and hatch space. When the laser power is 375 W, scanning speed is 2 000 mm/s, and hatch space is 50 μm, the relative density and tensile strength of AlSi10 Mg printed samples can reach 98.26% and 487 MPa, respectively.
引文
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