Abstract The microstructural optimization for selective laser melted 15-5PH stainless steel via heat treatment to enhance corrosion resistance was investigated. The results showed that after aging treatment, Cu-rich nanoparticles (about 10 nm) diffusely precipitated, and approximately 18∼25 % austenite was distributed near the molten pool boundary. The surface potential of the austenite was approximately 15 mV higher than that of martensite by scanning Kelvin probe force microscopy. However, the austenite phase disappeared and the new NbC-(Mn, Si)O duplex particles precipitated after solution treatment and aging treatment, which decreased the pitting corrosion resistance and passive film stability of the SLM 15-5PH stainless steel.

中文翻译：

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通过热处理提高选择性激光熔化15-5PH马氏体不锈钢的耐腐蚀性

摘要 研究了通过热处理提高选择性激光熔化15-5PH不锈钢的显微组织优化以提高耐腐蚀性。结果表明，时效处理后，富Cu纳米颗粒（约10 nm）扩散析出，约18~25%的奥氏体分布在熔池边界附近。通过扫描开尔文探针力显微镜，奥氏体的表面电位比马氏体的表面电位高约 15 mV。但在固溶处理和时效处理后奥氏体相消失并析出新的NbC-(Mn,Si)O双相颗粒，降低了SLM 15-5PH不锈钢的耐点蚀性和钝化膜稳定性。