炭素鋼オーステナイトの線材圧延における再結晶(熱間加工と再結晶)(<特集>再結晶・粒成長)

概要

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In order to clarify the structural change during high-speed sequential hot rolling, the prior-austenitic microstructures of quenched carbon steel with 0.44 to 0.83%C content were studied by (a) mill-motor-stop experiment in a wire-rod mill, (b) experimental one-pass high-speed rolling and (c) hot deformation simulator experiment. From the results it was concluded as follows : 1) After passing through a train of wire-rod rolling, austenite is fully recrystallized and the grain diameter, d, is approximately predicted from ZENER-HOLLOMON parameter Z, d reducing with higher Z. 2) Especially in higher Z, the grain diameter is larger than that of dynamically recrystallized austenite, possibly showing the contribution of static growth of grain after partial dynamic recrystallization. 3) Even in lower Z, the distribution of the grain diameter is positioned to the larger side of the dynamically recrystallized grain. This phenomenon is possibly due to the grain growth after dynamic recrystallization. 4) The fraction of recrystallization is higher in the wire-rod rolling than in the simulator experiment. This possibly shows the effect of additional strain in the caliber rolling.
社団法人日本鉄鋼協会の論文
1984-11-01