Heterogeneous nanostructure developed in heavily cold-rolled stainless steels and the specific mechanical properties

• DOI: 10.1016/j.scriptamat.2017.02.016
• Publication Date: 2017-02-20T11:04:38Z
• Authors: H. Miura; M. Kobayashi; Y. Todaka; C. Watanabe; Y. Aoyagi; N. Sugiura; N. Yoshinaga
• Keywords: 0203 mechanical engineering; 02 engineering and technology

Abstract Stainless steels were cold rolled to 92% reduction. The microstructure developed in a stable austenitic stainless steel was complicated heterogeneous nanostructure composed of lamellar-twin domains, shear bands and low-angle lamellar boundaries. Cold-rolled duplex stainless steel, however, exhibited more complicated and mixed microstructure where ferritic lamellar and the heterogeneous nanostructure of austenite were alternatively stacked. The heavily cold-rolled stainless steels followed by ageing exhibited marvelous high tensile strength over 2.6 GPa perpendicular to the rolling direction, although around 2 GPa along the rolling direction. Even while such high strength, moderate plastic elongation over 5% was attained.