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Dendrite Segregation Changes in High Temperature Homogenization Process of As-cast H13 Steel

机译：H13铸钢高温均质过程中枝晶偏析的变化

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摘要

The microstructural evolution and microhardness changes of the H13 ingot during homogenization process were investigated to characterize the dendrite segregation changes by optical microscopy (OM), scanning electron microscopy (SEM), electronic probe micro-analyzer (EPMA), X-Ray diffraction (XRD) and microhardness testing. The results showed that the severe dendrite segregation existed in H13 ingot, and there were a large amount of coarse non-equilibrium eutectic carbides (MC and M_7C_3) in dendrite region. After the soaking time of 15 h at 1 200℃, the dendrites almost disappeared, the contents of eutectic carbides decreased sharply. The values of segregation ratio SR were 1.20 for Cr, 1.26 for Mo and 1.41 for V which were the critical values of SR that marked the end of homogenization. After 20 h, a small amount of MC carbides still distributed at the grain boundaries. The SR values almost remained constant with the values of 1.10, 1.14 and 1.14 for Cr, Mo and V element respectively. The homogenization kinetics was established and it matched well with the experimental data. The microhardess in different soaking time reflected well the dendrite segregation changes, it decreased from 817.8 HV to 645.7 HV and then increases to 752.5 HV, finally it decreases gradually.
机译：通过光学显微镜（OM），扫描电子显微镜（SEM），电子探针显微分析仪（EPMA），X射线衍射仪（XRD）研究了H13锭在均质化过程中的组织演变和显微硬度变化，以表征枝晶的偏析变化。 ）和显微硬度测试。结果表明，H13钢锭存在严重的枝晶偏析，在枝晶区有大量的粗大的非平衡共晶碳化物（MC和M_7C_3）。在1200℃保温15小时后，枝晶几乎消失，共晶碳化物含量急剧下降。 Cr的偏析比SR的值为1.20，Mo的偏析值为1.26，V的偏析值为1.41，这是标志着均质化结束的SR的临界值。 20小时后，少量的MC碳化物仍分布在晶界处。 Cr，Mo和V元素的SR值几乎保持恒定，分别为1.10、1.14和1.14。建立了均质动力学，并与实验数据很好地吻合。在不同浸泡时间下的显微硬度很好地反映了枝晶偏析的变化，从817.8 HV降低到645.7 HV，然后增加到752.5 HV，最后逐渐降低。

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