The purpose of this paper is to investigate effects of layer thickness on densification, surface morphology, microstructure and mechanical and corrosion properties of 420 stainless steel fabricated by laser-powder bed fusion (L-PBF).,Standard specimens were printed at layer thickness of 10, 20 and 30 µm to characterize Archimedes density, surface roughness, tensile strength, elongation, hardness, microstructural phases and corrosion performance in the as-printed and heat-treated condition.,Archimedes density slightly increased from 7.67 ± 0.02 to 7.70 ± 0.02g/cm3 and notably decreased to 7.35 ± 0.05 g/cm3 as the layer thickness was changed from 20 µm to 10 and 30 µm, respectively. The sensitivity to layer thickness variation was also evident in properties, the ultimate tensile strength of as-printed parts increased from 1050 ± 25 MPa to 1130 ± 35 MPa and decreased to 760 ± 35 MPa, elongation increased from 2.5 ± 0.2% to 2.8 ± 0.3% and decreased to 1.5 ± 0.2, and hardness increased from 55 ± 1 HRC to 57 ± 1 HRC and decreased to 51 ± 1 HRC, respectively. Following heat treatment, the ultimate tensile strength and elongation improved but the general trends of effects of layer thickness remained the same.,Properties obtained by L-PBF are superior to reported properties of 420 stainless steel fabricated by metal injection molding and comparable to wrought properties.,This study successfully the sensitivity of mechanical and corrosion properties of the as-printed and heat-treated parts to not only physical density but also microstructure (martensite content and tempering), as a result of changing the layer thickness. This manuscript also demonstrates porosity evolution as a combination of reduced energy flux and lower packing density for parts processed at an increasing layer thickness.

中文翻译：

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层厚对420不锈钢激光粉床熔合的影响

本文的目的是研究层厚对激光粉末床融合 (L-PBF) 制造的 420 不锈钢的致密化、表面形貌、微观结构以及力学和腐蚀性能的影响。 10、20 和 30 µm 来表征阿基米德密度、表面粗糙度、拉伸强度、伸长率、硬度、微观结构相和在印刷和热处理条件下的腐蚀性能。阿基米德密度从 7.67 ± 0.02 略微增加到 7.70 ± 0.02 g/cm3 并且随着层厚分别从 20 µm 变为 10 µm 和 30 µm，显着降低至 7.35 ± 0.05 g/cm3。对层厚变化的敏感性在性能方面也很明显，打印件的极限抗拉强度从1050±25 MPa增加到1130±35 MPa并减少到760±35 MPa，伸长率从2.5±0.2%增加到2.8±0.3%并减少到1.5±0.2，硬度增加从 55 ± 1 HRC 到 57 ± 1 HRC 和下降到 51 ± 1 HRC，分别。热处理后，极限抗拉强度和伸长率有所提高，但层厚度影响的总体趋势保持不变。,L-PBF 获得的性能优于通过金属注射成型制造的 420 不锈钢的性能，可与锻造性能相媲美.,这项研究成功地研究了印刷和热处理零件的机械和腐蚀特性不仅对物理密度而且对微观结构（马氏体含量和回火）的敏感性，由于改变层厚。这份手稿还展示了孔隙率的演变是由于层厚增加而加工的零件的能量通量降低和堆积密度降低的组合。