Abstract High-performance high nitrogen stainless steel (HNS) with ultra-high strength up to ∼1.7 GPa and excellent corrosion resistance was successfully obtained by friction stir processing. The simultaneous enhancement in strength and corrosion resistance was mainly attributed to the grain ultra-refinement. Uniform ultrafine-grained microstructure (∼225 nm) significantly improved the repassivation behavior of HNS. With significantly increased element diffusion rate and element content, the passive film formed on the ultrafine-grained HNS showed high resistance to the nucleation and growth of pits. Grain ultra-refinement was confirmed to be an effectual method for improving corrosion resistance of HNS without sacrificing strength.

中文翻译：

---

晶粒超细化对超高强度高氮不锈钢腐蚀行为的影响

摘要 通过搅拌摩擦加工成功获得了具有高达~1.7 GPa 超高强度和优异耐腐蚀性的高性能高氮不锈钢（HNS）。强度和耐腐蚀性的同时提高主要归功于晶粒的超细化。均匀的超细晶粒微观结构（~225 nm）显着改善了 HNS 的再钝化行为。随着元素扩散速率和元素含量的显着增加，在超细晶粒 HNS 上形成的钝化膜对凹坑的成核和生长表现出很高的抵抗力。晶粒超细化被证实是一种在不牺牲强度的情况下提高 HNS 耐腐蚀性的有效方法。