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Effect of flash processing on recrystallization behavior and mechanical performance of cold-rolled IF steel
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-09-05 , DOI: 10.1007/s12613-020-2023-2
Peng-yu Wen , Jian-sheng Han , Hai-wen Luo , Xin-ping Mao

Flash processing (FP) has attracted considerable attention due to its high efficiency, economic advantages, and the extraordinary opportunity if offers to improve the mechanical properties of steel. In this study, we investigated the influences of FP on the recrystallization (REX) behavior and mechanical performance of cold-rolled IF steel. Using a thermomechanical simulator, we performed both single-stage FPs, at heating rates of 200°C/s and 500°C/s, and two-stage FP, with an initial preheating to 400°C at a rate of 5°C/s and then to peak temperatures at a rate of 200°C/s. In comparison to continuous annealing (CA), single-stage FP can effectively refine the recrystallized grain sizes and produce a similar or even sharper γ (ND (normal direction)//{111}) texture component. In particular, the heating rate of 500°C/s led to an increase in the yield strength of about 23.2% and a similar ductility. In contrast, the two-stage FP resulted in a higher REX temperature as well as a certain grain refinement due to the stored strain energy, i.e., the driving force of REX, which was largely consumed during preheating. Furthermore, both stronger {110}<110> and weaker γ texture components appeared in the two-stage FP and were believed to be responsible for the early necking and deterioration in ductility.



中文翻译:

闪光处理对IF冷轧钢再结晶行为和力学性能的影响

闪速加工(FP)由于其高效率,经济优势以及提供改善钢的机械性能的绝佳机会而备受关注。在这项研究中,我们调查了FP对冷轧IF钢的再结晶(REX)行为和力学性能的影响。使用热机械模拟器,我们以200°C / s和500°C / s的加热速率执行了单级FP,并以5°C的初始预热至400°C的速率执行了两级FP。 / s,然后以200°C / s的速率达到峰值温度。与连续退火(CA)相比,单级FP可以有效地细化重结晶的晶粒尺寸,并产生相似甚至更锐利的γ(ND(法线方向)// {111})织构分量。尤其是,500℃/ s的加热速率导致屈服强度提高约23.2%,并具有类似的延展性。相反,由于在预热过程中大量消耗了所存储的应变能,即REX的驱动力,两级FP导致了更高的REX温度以及一定的晶粒细化。此外,在两阶段FP中出现了较强的{110} <110>和较弱的γ织构分量,它们被认为是造成早期缩颈和延展性的原因。

更新日期:2020-09-06
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