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Corrosion Behavior of 316L Stainless Steel Fabricated by Selective Laser Melting Under Different Scanning Speeds

机译:不同扫描速度下选择性激光熔化制造的316L不锈钢的腐蚀行为

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摘要

This work discussed the effects of different scanning speeds (800, 1083, 1200 and 1400 mm/s) on the microstructure of 316L stainless steel manufactured by selective laser melting (SLM) and the related corrosion behavior. Results showed that there were more voids with faster scanning speeds, and there were oxide powder and non-melt silicon inside the defects. The SLM 316L exhibited a full gamma austenite phase filled with sub-grains, and the average grain size of SLM-1083 mm/s 316L was approximately 42 mu m, three times larger than that of the quenched 316L. The pitting potentials for the SLM 316L were all approximately 300 mV higher than that of the quenched due to the modification of inclusions in SLM, but the corrosion rate for the SLM 316L was faster, which was attributed to the voids and unstable passive film. The number of pitting sites increased with the scanning speed, and the pits occurred preferentially at the voids in SLM 316L.
机译:该工作讨论了通过选择性激光熔化(SLM)和相关腐蚀行为制造的316L不锈钢的微观结构的不同扫描速度(800,1083,1200和1400mm / s的影响。 结果表明,扫描速度更快,缺陷内部有更快的空隙,并且缺陷内部存在氧化物粉末和非熔体硅。 SLM 316L表现出填充有亚颗粒的全γ奥氏体相,并且SLM-1083mm / s 3161的平均晶粒尺寸约为42μm,比淬火316L的三倍大。 由于SLM中的夹杂物的改变,SLM 316L的蚀电位全部约为300mV,但是由于SLM中的夹杂物的改变,但SLM 316L的腐蚀速率较快,其归因于空隙和不稳定的无源膜。 凹坑点的数量随扫描速度而增加,并且凹坑优先发生在SLM 316L中的空隙。

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