日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
特集「先端材料の結晶方位分布と関連特性Ⅱ」
単純強圧延オーステナイト系ステンレス鋼中のヘテロナノ組織が集合組織と延性に及ぼす影響
三浦 博己小林 正和戸髙 義一渡邊 千尋青柳 吉輝
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2017 年 81 巻 12 号 p. 536-541

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SUS316LN austenitic stainless steel was simply and heavily cold-rolled up to 92% reduction in thickness. The microstructure developed was composed of complicated heterogeneous nano-structure; “eye-shaped” twin domains, which were surrounded by shear bands, were embedded in low-angle lamellar boundaries. The cold-rolled austenitic steel exhibited marvelous high strength of 1.95 GPa when tensile tested normal to the rolling direction, while lower strength of 1.57 GPa along the rolling direction. Moderate ductility around 10% was still retained in spite of the high strength. The superior mechanical properties of the heavily cold-rolled austenitic stainless steel would be attributed to complicated heterogeneous nano-structures. These achieved strengths were comparable with those obtained by methods of severe plastic deformation.

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