微細結晶粒を有する SUS304 の高温変形挙動に及ぼす残留マルテンサイトの影響

概要

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The high temperature deformation properties of two stainless steels, austenite single phase and austenite/martensite dual phases have been studied. These two materials were not conventionally produced but reversely transformed into austenite phase from martensite phase which was induced by large plastic deformation on austenitic stainless steel SUS304 (similar to AISI304) below the temperature of Md point. Tensile tests on both alloy sheets with initial grainsize refined below 1μm by such above processing have been conducted at different temperatures from 923K to 1023K at strain rates ranging from 3.0×10^<-5> to 1.0×10^<-2> s^<-1>. These both materials exhibit a maximum elongation exceeding 200 pct with very low flow stress. The dual phase material shows more elongation and less flow stress in comparison with the single phase material, and the lower testing temperatures or the higher strain rates, the larger this tendancy becomes clearly. This is the reason why a slight martensite phase which is included in the dual phase material prevents the grain size of austenite phase from coasening during large deformation.
社団法人日本鉄鋼協会の論文
1997-03-01