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Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

机译:高Ti含量对低碳Nb微合金钢热变形期间奥氏体微结构演化的影响

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摘要

This work has focused on the study of hot working behavior of Ti-Nb microalloyed steels with high Ti contents (> 0.05%). The role of Nb during the hot deformation of low carbon steels is well known: it mainly retards austenite recrystallization, leading to pancaked austenite microstructures before phase transformation and to refined room temperature microstructures. However, to design rolling schedules that result in properly conditioned austenite microstructures, it is necessary to develop models that take into account the effect of high Ti concentrations on the microstructural evolution of austenite. To that end, in this work torsion tests were performed to investigate the microstructural evolution during hot deformation of steels microalloyed with 0.03% Nb and different high Ti concentrations (0.05%, 0.1%, 0.15%). It was observed that the 0.1% and 0.15% Ti additions resulted in retarded softening kinetics at all the temperatures. This retardation can be mainly attributed to the solute drag effect exerted by Ti in solid solution. The precipitation state of the steels after reheating and after deformation was characterized and the applicability of existing microstructural evolution models was also evaluated. Determined recrystallization kinetics and recrystallized grain sizes reasonably agree with those predicted by equations previously developed for Nb-Ti microalloyed steels with lower Ti concentrations (<0.05%).
机译:这项工作侧重于研究Ti-Nb微合金钢的热工作行为,具有高Ti含量(> 0.05%)。 Nb在低碳钢的热变形期间Nb的作用是众所周知的:主要是延缓奥氏体重结晶,导致相变前易奥氏体微结构和精制室温微观结构。然而,为了设计导致正确调节的奥氏体微结构的滚动计划,有必要开发考虑高Ti浓度对奥氏体微观结构演化的影响的模型。为此,在该工作中,进行扭转测试以研究微合金化的钢的热变形过程中的微观结构演化,以0.03%Nb和不同高Ti浓度(0.05%,0.1%,0.15%)。观察到0.1%和0.15%的Ti添加导致所有温度的延迟软化动力学。这种延迟主要归因于TI在固溶体中施加的溶质阻力效应。再加热和变形后钢的沉淀状态表征,并评估了现有的微观结构演化模型的适用性。确定的重结晶动力学和重结晶晶粒尺寸合理地与先前为Nb-Ti微合金钢的方程预测的那些相同,具有较低的Ti浓度(<0.05%)。

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