C Clustering and Partitioning by Static Strain Aging in Cold-Rolled 16cr-5ni Supermartensitic Stainless Steel

Hojun Gwon, Sung-Ho Kim, J. Jeon, Sung-Joon Kim
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引用次数: 2

Abstract

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.
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冷轧16cr-5ni超马氏体不锈钢的静态应变时效聚类与分配
摘要:研究冷轧16Cr-5Ni超马氏体不锈钢在400℃下时效30min后的静态应变时效行为。在20%冷轧试样的单轴拉伸试验中,时效试样的屈服强度比轧制试样提高到~300 MPa,应变硬化率降低。在中断拉伸试验中,时效试样观察到延迟马氏体转变。膨胀分析发现,在400℃下保温30分钟,体积收缩,表明碳(C)从α′马氏体向奥氏体分配。用脉冲内摩擦法和Cottrell气氛形成观测证实了C在α′马氏体中的聚类。三维原子探针层析分析显示,C原子在α′马氏体中聚集,C原子在奥氏体中分布。在时效处理过程中,C原子的重新分布导致了屈服强度的显著提高。
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