低炭素鋼の変態域圧延におけるフェライト占積率と粒径の予測

概要

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Static recovery and recrystallization behavior of α grains of low carbon steels have been studied by means of hot working simulator. Static recovery rate increases as carbon content increases up to 0.02mass% and is nearly constant above 0.02mass%. The critical strain for recrystallization, ε_m, decreases with decreasing initial grain size and strain rate and with increasing deformation temperature. Recrystallized grains are developed within an interval of 50 ms after straining over ε_m. Recrystallized α grain sizes decrease with decreasing initial grain size and deformation temperature, and with increasing strain. Recrystallized fraction increases with decreasing initial grain size and with increasing strain and deformation temperature. 2-step hot working tests at various temperatures above and below Ae_3 have been carried out to examine the strain induced transformation from hot worked austenite to ferrite. On the basis of these results, a prediction model of α volume fraction and grain size is developed and its availability in the case of intercritical rolling was certified.
社団法人日本鉄鋼協会の論文
1995-06-01