Abstract The pitting corrosion resistance of 316L stainless steel (316L SS) additively manufactured by selective laser melting (SLM) has been reported to be substantially higher than its commercial counterpart due to the elimination of MnS inclusions. Here we report that the pitting corrosion resistance of the SLM-produced 316L SS declines drastically after thermal post-processing above 1000 °C. This unanticipated drastic decline in pitting resistance is explained based on the formation of deleterious MnS inclusions in the SLM-produced 316L SS after high-temperature thermal post-processing. This finding may have wide implications for determining suitable post-processing and industry application conditions for SLM-produced 316L SS.

中文翻译：

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增材制造的 316L 不锈钢在高温后处理后的耐点蚀性急剧下降

摘要 据报道，由于消除了 MnS 夹杂物，通过选择性激光熔化 (SLM) 增材制造的 316L 不锈钢 (316L SS) 的耐点蚀性大大高于其商业同类产品。在这里我们报告说，SLM 生产的 316L SS 的耐点蚀性在 1000°C 以上的热后处理后急剧下降。这种出乎意料的耐点蚀性急剧下降的解释是基于 SLM 生产的 316L SS 在高温热处理后形成有害的 MnS 夹杂物。这一发现可能对确定 SLM 生产的 316L SS 合适的后处理和工业应用条件具有广泛的意义。