Densification behavior of gas and water atomized 316L stainless steel powder during selective laser melting
Densification behavior of gas and water atomized 316L stainless steel powder during selective laser melting
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DOI：
10.1016/j.apsusc.2010.02.030
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发表时间：
2010-04-15
影响因子：
6.7
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
--
作者：
Li, Ruidi;Shi, Yusheng;Jiang, Wei
选择性激光熔化（SLM）过程中的致密化是决定SLM零件最终应用的重要因素。研究了不同工艺条件下的致密化过程，并对致密化机理进行了探讨。结果表明，较高的激光功率、较低的扫描速度、较窄的开口间距和较薄的层厚可以使熔凝表面更加光滑，从而获得更高的致密化效果;与水雾化粉末相比，气雾化粉末的氧含量较低，堆积密度较高，因而具有更好的致密化效果。即使扫描轨迹是连续的并且润湿得非常好，也可以在较宽的影线间距下生成大量规则形状的孔。探讨了致密化机理，提出了抑制球化现象、提高扫描轨迹重叠率和减少微裂纹等致密化金属零件的方法。(C)2010爱思唯尔有限公司版权所有。
The densification during selective laser melting (SLM) process is an important factor determining the final application of SLM-part. In the present work, the densifications under different processing conditions were investigated and the densification mechanisms were elucidated. It was found that the higher laser power, lower scan speed, narrower hatch spacing and thinner layer thickness could enable a much smoother melting surface and consequently a higher densification.The gas atomized powder possessed better densification than water atomized powder, due to the lower oxygen content and higher packing density of gas atomized powder. A large number of regular-shaped pores can be generated at a wider hatch spacing, even if the scanning track is continuous and wetted very well. The densification mechanisms were addressed and the methods for building dense metal parts were also proposed as follows: inhibiting the balling phenomenon, increasing the overlap ratio of scanning tracks and reducing the micro-cracks. (C) 2010 Elsevier B.V. All rights reserved.