単相ステンレス鋼の再結晶および高温変形挙動

概要

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This study is aimed to investigate the recrystallization for grain refinement and the hot tensile behaviour of single phase stainless steels, namely ferritic Fe-17Cr(SUS430), austenitic Fe-18Cr-8Ni(SUS304) and Fe-25Cr-20Ni(SUS310) so as to examine their possibilities of superplasticity. The influence of reduction in area and annealing conditions on static recrystallization was investigated. Subsequently, m value and total elongation were measured for evaluation of superplasticity, after hot tension tests were carried out for recrystallized stainless steels sheet at various temperatures below the recrystallization temperature and with various strain rates. A critical working reduction in area required for recrystallization was about 25% for SUS430, a few % for SUS304 and 20% for SUS310. The fine grain size was obtained under the optimum recrystallization condition for SUS310, though it was not obtained for the other two types of stainless steels. Among single phase stainless steels, only SUS310 with the recrystallized fine grain size showed superplastic behaviour and its maximum elongation exceeded 200% at 1088 K with the initial strain rate of 4.2×10^<-4>s^<-1>.
社団法人日本鉄鋼協会の論文
1989-07-01