Abstract The corrosion resistance of 17-4PH stainless steel obtained by Selective Laser Melting was investigated. It was found that the as-built SLM-ed steel was entirely ferritic, not martensitic as expected. Re-austenitized SLM-ed steel recovered the martensitic microstructure. The two SLM-ed steels (as-built and re-austenitized) had the same general corrosion resistance which was correlated with their similar chemical composition. The martensitic re-austenitized SLM-ed steel had superior general corrosion behavior than the wrought martensitic steel. This was due to the nearly absence of MnS inclusions in the re-austenitized SLM-ed steel, while their presence in the wrought steel destabilized the passive film.

中文翻译：

---

显微组织和硫化锰对选择性激光熔化 17-4 PH 不锈钢在酸性氯化物介质中耐蚀性的影响

摘要 研究了选区激光熔化法制备的17-4PH不锈钢的耐腐蚀性能。发现完工的 SLM 钢完全是铁素体，而不是预期的马氏体。再奥氏体化的 SLM 处理钢恢复了马氏体显微组织。两种经过 SLM 处理的钢（竣工和再奥氏体化）具有相同的总体耐腐蚀性能，这与其相似的化学成分相关。与锻造马氏体钢相比，马氏体再奥氏体化 SLM 钢具有更好的全面腐蚀行为。这是因为再奥氏体化的 SLM 钢中几乎没有 MnS 夹杂物，而它们在锻钢中的存在使钝化膜不稳定。