Tailoring and investigation of defined porosity properties in thin-walled 316L structures using laser-based powder bed fusion
Tailoring and investigation of defined porosity properties in thin-walled 316L structures using laser-based powder bed fusion
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DOI：
10.1007/s40964-019-00095-5
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发表时间：
2019-08
影响因子：
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通讯作者：
E. Abele;T. Reiber;M. Hampe;María Catalina Bermúdez Agudelo;Fabian Menz
中科院分区：
文献类型：
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作者：
E. Abele;T. Reiber;M. Hampe;María Catalina Bermúdez Agudelo;Fabian Menz
工艺工程应用需要一定的质量传输，因此需要具有一定孔隙度的薄壁结构。研究了用316L不锈钢进行激光粉末床熔合（PBF-LB）的潜在制造方法。通过称重和体积测量来确定总孔隙度。采用中心复合设计（CCD）方法研究了工艺参数、激光功率、扫描速度和孵化距离对孔隙度的影响。开发了一个统计上显著的回归模型，以便在设计空间内预测孔隙率值。为了确定多孔剖面的分布和大小，还使用了透射光模式下的计算机断层扫描和显微镜。渗透率也进行了分析。在设计空间内，渗透率系数为2258.26 E−12 m2，最大孔隙度为19.00%。通过CT分析可知，当区域激光能量密度在0.625 ~ 0.744 J/mm2之间时，平均孔径为4728.57 ~ 9841.38µm2。
Process engineering applications, which require a defined mass transport, call for thin-walled structures with a defined open porosity. Powder bed fusion by a laser beam (PBF-LB) is investigated as a potential manufacturing method using stainless steel 316L to produce such structures. The total porosity was determined by weighing and volume measurement. The influence of the process parameters laser power, scan speed and hatch distance on porosity was investigated by means of a design of experiments (DoE) approach using a central composite design (CCD). A statistically significant regression model was developed to allow a prediction of the porosity values within the design space. To determine the distribution and size of porous sections, computed tomography and a microscope in transmitted light mode were used as well. Permeability was also analyzed. Within the design space, a permeability coefficient of 2258.26 E−12 m2was achieved with a maximum porosity value of 19.00%. With the help of the CT analysis, it was determined that for area laser energy densities between 0.625 and 0.744 J/mm2, the average pore size from 4728.57 to 9841.38 µm2can be adapted.