间接选择性激光烧结与选择性激光熔化对比研究

采用选择性激光烧结（Selective laser sintering，SLS）和选择性激光熔化（Selective laser melting，SLM）工艺，分别进行了铁基合金粉末的快速成形试验，对比分析了SLS与SLM成形机理、相应的工艺参数以及它们对测试件成形过程、金相组织与力学性能的影响。结果表明：由于成形机理不同，相对于SLS技术，采用SLM能够制造高致密度、组织均匀、力学性能良好的金属零件，但容易出现翘曲变形、裂纹与球化现象。通过制定合适的材料与工艺参数能够避免上述缺陷。

Comparisons of Indirect Selective Laser Sintering with Selective Laser Melting

Selective Laser Sintering and Selective Laser Melting were applied to carry on rapid prototyping experiments with Fe-base alloy powders. Their different formation mechanisms and corresponding technology parameters were investigated, and their effect on the formation process, microstructure and mechanical properties of metal parts was studied as well. Due to different formation mechanisms, the results show that metal parts with higher density, uniform structure and better mechanical performance can be manufactured by SLM in contrast with SLS, but there exist warpage, crack and bailing phenomenon in the formation process easily, which can be avoided by choosing appropriate material and technology parameters.