Microstructural Evolution during Homogenization and Hot Deformation for As‐Cast H13 Steel,Steel Research International

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Microstructural Evolution during Homogenization and Hot Deformation for As‐Cast H13 Steel
Steel Research International ( IF 1.9 ) Pub Date : 2020-12-07 , DOI: 10.1002/srin.202000439
Yahui Han ₁ , Changsheng Li ₁ , Jinyi Ren ₁ , Chunlin Qiu ₁ , En Li ₁ , Shuaishuai Chen ₁

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The hot compression experiments are accomplished to investigate the microstructural evolution of as‐cast H13 steel during homogenization treatment and hot deformation. At a certain homogenization temperature, the dynamic recrystallization (DRX) volume fraction increases with increasing strain and deformation temperature and decreasing strain rate. However, the DRX is also easy to proceed at a high strain rate of 5 s⁻¹ due to the high shear stress. The recrystallization is inhibited in a dendrite segregation region. The residual dendrite segregation left after homogenization treatment will improve the recrystallization nucleation rate during the subsequent deformation. The recrystallization grains preferentially nucleate in the dendrite region, and the grain growth is inhibited by the dendrite segregation. The partial homogenization before deformation is beneficial to achieve the fine microstructure.

中文翻译：

铸造H13钢均质化和热变形过程中的组织演变

完成热压缩实验以研究铸态H13钢在均质化处理和热变形过程中的组织演变。在一定的均质温度下，动态重结晶（DRX）的体积分数随应变和变形温度的升高以及应变速率的降低而增加。但是，DRX也易于在5 s ^-1的高应变速率下进行由于高剪切应力。在枝晶偏析区域中抑制了再结晶。均质处理后残留的枝晶偏析将改善后续变形过程中的再结晶成核速率。重结晶晶粒优先在枝晶区域中成核，并且晶粒生长被枝晶偏析抑制。变形前的部分均质化有利于获得良好的微观结构。

更新日期：2020-12-07

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