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首页> 外文期刊>Materials Science and Engineering >Identification and characterization of spatter particles and their effect on surface roughness, density and mechanical response of 17-4 PH stainless steel laser powder-bed fusion parts
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Identification and characterization of spatter particles and their effect on surface roughness, density and mechanical response of 17-4 PH stainless steel laser powder-bed fusion parts

机译：鉴定和表征飞溅颗粒及其对17-4 pH不锈钢激光粉床融合件的表面粗糙度，密度和机械响应的影响

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摘要

As an emerging additive manufacturing (AM) process, laser powder-bed fusion (LPBF) provides a new prospect for production of complex metallic parts. Laser-material interaction and melt pool dynamics govern the physics behind the LPBF process. However, instabilities in melt pool dynamics lead to the formation and ejection of spatter particles, which are known to change the powder-bed characteristics thus affecting the quality of printed parts. In this work, a comparative study is performed on the virgin and spatter powder particles where two types of spatter particles so-called: under-size (US) and over-size (OS) spatters are studied. Chemical composition, crystallographic phases, microstructure and morphology of the virgin powder as well as the US and OS spatters of 17-4 martensitic/precipitation hardened (PH) stainless steel (SS) powders are studied in detail. Particle analysis results show a significant morphology and size difference between the virgin (D90 - 60 mu m) powder, US (D90 - 80 mu m) and OS (D90 - 130 mu m) spatters. Effect of spatter particles on the surface roughness, density and tensile response of printed parts is also studied. Compared to the parts printed in the non-spatter rich (NSR) region, parts printed in the spatter rich (SR) zone show a 15% and 28% increase in surface roughness for tensile and cylindrical samples, respectively. In addition, higher porosity is observed in these parts with larger pores. Moreover, tensile response shows an abrupt failure resulting in a reduction in ductility due to the presence of large pores (similar to 100 mu m) observed on the fracture surface and x-ray computed tomography results.
机译：作为一种新兴添加剂制造（AM）工艺，激光粉床融合（LPBF）为复合金属部件的生产提供了新的前景。激光物质互动和熔体池动力学管理LPBF过程背后的物理。然而，熔融池动力学中的不稳定性导致形成和喷射飞溅颗粒，已知可以改变粉末床特性，从而影响印刷部件的质量。在这项工作中，对比较研究进行了在原始和飞溅粉末颗粒上进行的，其中两种类型的飞溅颗粒所谓的：尺寸（美国）和过尺寸（OS）飞溅物。详细研究了原始粉末以及17-4马氏体/沉淀的US和OS飞溅物的化学成分，结晶阶段，微观结构和形态，并进行了淬火（pH）不锈钢（PH）不锈钢（SS）粉末。颗粒分析结果显示了处女（D90-60μm）粉末，US（D90-80 mu m）和OS（D90-130 mu m）飞溅之间的显着形态和大小差异。还研究了喷溅颗粒对印刷部件表面粗糙度，密度和拉伸响应的影响。与在非喷溅富（NSR）区域印刷的部件相比，富含富有的零件印刷的零件（SR）区域分别显示拉伸和圆柱样品的表面粗糙度增加15％和28％。此外，在这些部件中观察到更高的孔隙率孔隙。此外，拉伸响应显示出突然的故障导致导致延展性的降低，由于在断裂表面和X射线计算机断层扫描结果上观察到的大孔（类似于100μm）。

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