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Effect of billet microstructure and deformation on austenite grain growth in forging heating of a medium-carbon microalloyed steel
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.jallcom.2021.159326
Fan Zhao , Hao Hu , Xinhua Liu , Zhihao Zhang , Jianxin Xie

We prepared samples with different ferrite-pearlite characteristics and deformation by heat treatment and Gleeble thermocompression respectively. Then, the different samples are rapidly heated to 1200 °C for 60 s to study the austenite grain growth. The study results show that the ferrite-pearlite characteristics has little effect on austenite grain growth. With the mean austenite grain size (MAGS) of billet microstructure increasing from 14 µm to 56 µm, the MAGS after heating only increases from 47 µm to 56 µm. With the cooling rate of billet samples increasing from 0.1 °C/s to 1.0 °C/s, the MAGS after heating has basically no change. However, the deformation of billet samples has significant effect on the austenite grain growth. With the deformation at 1150 °C increasing from 10% to 50%, the MAGS after heating decreases from 63 µm to 31 µm. In the meanwhile, the mean distance between element segregation bands decreases from 115 µm to 33 µm, and the mean width of element segregation bands decreases from 70 µm to 20 µm. Electron probe microanalysis shows that the segregation region has higher Si, Cr, Mn and V contents, which generate stronger solute drag effect on austenite grain boundaries. Deformation can crush the as-cast grains and make the segregation bands fine and dispersed, further refining the austenite grains after heating.



中文翻译:

中碳微合金钢锻造加热时坯组织和变形对奥氏体晶粒长大的影响

我们分别通过热处理和Gleeble热压制备了具有不同铁素体-珠光体特性和变形的样品。然后,将不同样品快速加热至1200°C持续60 s,以研究奥氏体晶粒的生长。研究结果表明,铁素体-珠光体的特性对奥氏体晶粒长大的影响很小。随着方坯组织的平均奥氏体晶粒尺寸(MAGS)从14 µm增加到56 µm,加热后的MAGS仅从47 µm增加到56 µm。随着钢坯样品的冷却速率从0.1°C / s增加到1.0°C / s,加热后的MAGS基本没有变化。然而,钢坯样品的变形对奥氏体晶粒的生长有重要影响。随着1150°C下的变形从10%增加到50%,加热后的MAGS从63 µm降低到31 µm。同时,元素隔离带之间的平均距离从115μm减小到33μm,元素隔离带的平均宽度从70μm减小到20μm。电子探针显微分析表明,偏析区的Si,Cr,Mn和V含量较高,对奥氏体晶界产生较强的溶质拖曳作用。变形会压碎铸态晶粒并使偏析带细化并分散,从而在加热后进一步细化奥氏体晶粒。

更新日期:2021-03-01
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