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Influence of Strain Rate on Tensile Characteristics of SUS304 Metastable Austenitic Stainless Steel 被引量:1
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作者 Xifeng LI Jun CHEN +2 位作者 Liyan YE Wei DING Pengchao SONG 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2013年第6期657-662,共6页
The microstructure characteristics and plastic deformation behavior of SUS304 metastable austenitic stainless steel sheets have been investigated during tensile process at different strain rates at room temperature. T... The microstructure characteristics and plastic deformation behavior of SUS304 metastable austenitic stainless steel sheets have been investigated during tensile process at different strain rates at room temperature. The yield stress continuously increases with strain rates due to low fraction of martensite transformed from austenite at 0.2% plastic stain. While the ultimate tensile stress (UTS) and elongation gradually decreases and then slightly increases with increase in strain rate from 0.0005 s-1 to 0.i s-1, which is attributed to the variation of the martensite fraction that is affected seriously by adiabatic heating. A higher temperature increase in the tensile specimens restricts the martensitic transformation at high strain rate. The strain rate of 0.1 s-1 is considered as a transition deformation rate from quasi-static state to plastic forming, where the transformed martensitic content is very small in a higher strain rate range. Anomalous stress peaks in the later half stage of deformation occur at a very low strain rate (i.e., 0.0005 s-1) result from X-shaped strain localization repeatedly sweeping over the specimen. With increasing strain rates, the variation of dimple number density follows similar trend as that of UTS and ductility because martensite fraction mostly influences void nucleation and growth. 展开更多
关键词 sus304 metastable austenitic stainless steel Strain rate Mechanical prop-erties Martensite fraction DIMPLE
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