熱間圧延直後の再結晶オーステナイト粒度におよぼす圧延歪み速度の影響(熱間加工と再結晶)(<特集>再結晶・粒成長)

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The effect of rolling strain rate on the grain size of austenite recrystallized immediatelly after hot rolling was investigated in the temperature range of 1000 to 1200℃. An increase in roll speed and/or a decrease in the specimen thickness before reduction was found to contribute to the refinement of recrystallized austenite grains. It suggested that austenite grain size also changed with roll radius. These results indicate that austenite grain size depends on roll radius, roll speed, and the slab thickness, in addition to generally known factors such as rolling temperature, rolling reduction, and initial grain size. It is known that recrystallized austenite grain size after hot rolling is well related with rolling reduction when rolling temperature and initial grain size are held constant. In this experiment where the specimen thickness before reduction, roll speed, and roll radius were variable factors, a good correlation was obtained between austenite grain size and rolling strain rate. We found that austenite grain size number (N) was hardly affected by the alloying elements such as C, Mn, Nb, V, Mo, and Ti, but was approximately related to rolling strain rate (<ε^^.>^^-) by : N=-8.3<ε^^.>^^-^<-1/2>+0.33N_0+0.010(1200-T)+8.8 where N_0 is initial grain size number and T is rolling temperature. <ε^^.>^^-=2πn/(60√<r>)・√<R/(H_0)>・ln(1/(1-r)) where n is roll speed (rpm), r is rolling reduction, R is roll radius (mm), and H_0 is thickness before reduction (mm).
社団法人日本鉄鋼協会の論文
1984-11-01

熱間圧延直後の再結晶オーステナイト粒度におよぼす圧延歪み速度の影響(熱間加工と再結晶)(<特集>再結晶・粒成長)

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