Abstract Static strain aging behavior of cold-rolled 16Cr-5Ni supermartensitic stainless steel was investigated after it had been aged for 30 min at 400°C. In uniaxial tensile tests of 20% cold-rolled specimens, increase of yield strength to ~300 MPa and decrease of strain hardening rate were observed in the aged specimen, compared to the as-rolled specimen. In interrupted tensile tests, delayed martensitic transformation was observed in the aged specimen. Dilatometry analysis detected volume shrinkage during the 30 min holding period at 400°C indicating partitioning of carbon (C) from α’ martensite to austenite. The clustering of C in α’ martensite was confirmed by impulse internal friction technique with observation of Cottrell atmosphere formation. 3D atom probe tomography analysis revealed partitioning of C atoms into austenite and clustering of C atoms in the α’ martensite. The remarkable increase of yield strength was attributed to redistribution of C atoms during the aging treatment.

中文翻译：

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C在冷轧16Cr-5Ni超马氏体不锈钢中静态应变时效的聚集和分配

摘要 研究了冷轧16Cr-5Ni超马氏体不锈钢在400℃时效30 min后的静态应变时效行为。在 20% 冷轧试样的单轴拉伸试验中，与轧制试样相比，观察到时效试样的屈服强度增加到~300 MPa，应变硬化率降低。在间断拉伸试验中，在时效试样中观察到延迟马氏体转变。膨胀计分析检测到在 400°C 下保持 30 分钟期间的体积收缩，表明碳 (C) 从 α' 马氏体分配到奥氏体。C在α'马氏体中的聚集通过脉冲内摩擦技术和Cottrell大气形成的观察得到证实。3D 原子探针断层扫描分析显示 C 原子分配到奥氏体中，并且 C 原子在 α' 马氏体中聚集。屈服强度的显着增加归因于时效处理过程中碳原子的重新分布。