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首页> 外文期刊>Metals and Materials International >Assessment of Austenite Static Recrystallization and Grain Size Evolution during Multipass Hot Rolling of a Niobium-Microalloyed Steel
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Assessment of Austenite Static Recrystallization and Grain Size Evolution during Multipass Hot Rolling of a Niobium-Microalloyed Steel

机译：铌微合金钢多道次热轧过程中奥氏体静态再结晶和晶粒尺寸演变的评估

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摘要

Double-deformation isothermal tests and multipass continuous-cooling hot torsion tests were used to study the evolution of austenite microstructures during isothermal and non-isothermal hot deformation of an Nb microalloyed steel. These tests, coupled with microstructural characterization, have verified that the no-recrys-tallization temperature (T_(nr)) corresponds roughly to the temperature where recrystallization starts to be incomplete during rolling. An accurate method to estimate the recrystallized fraction during hot rolling based on stress-strain data, and which does not require metallographic studies, is proposed. The results of this method have been successfully compared to metallographic measurements, the values of non-isothermal fractional softening and the accumulated stress measured in the plots of mean flow stress (MFS) versus the inverse of temperature. A remarkable austenite grain refinement occurs in the first hot rolling passes after reheating. The correlation of isothermal and continuous cooling tests is better understood if the effect of grain size on recrystallization and precipitation is taken into account.
机译：利用双变形等温试验和多道次连续冷却热扭转试验研究了Nb微合金钢在等温和非等温热变形过程中奥氏体组织的演变。这些测试，加上微观结构表征，已经证明无重结晶温度（T_（nr））大致对应于轧制过程中重结晶开始不完全的温度。提出了一种基于应力-应变数据估算热轧过程中再结晶分数的准确方法，该方法无需金相研究。该方法的结果已成功地与金相测量，非等温分数软化值和在平均流动应力（MFS）相对于温度倒数的曲线中测得的累积应力进行了比较。再加热后的第一个热轧道次中发生了明显的奥氏体晶粒细化。如果考虑晶粒尺寸对重结晶和沉淀的影响，则可以更好地理解等温和连续冷却试验的相关性。

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