This study determined that the homogenisation temperature range of experimental as-cast H13 steel was from 1150 to 1230 °C, whilst the effect of homogenisation temperature range on the microstructural evolution and microhardness was tested. The enrichment of alloying elements in the dendrite segregation region decreased the solidus temperature of matrix, whose total content determined the maximum homogenisation temperature. The secondary dendrite branches were most dissolved at 1150 °C, and overheating appeared at 1230 °C in the segregation region. Moreover, the primary carbides underwent shrinking, passivation, fragmentation and dissolution. The secondary carbides M₂₃C₆ and M₆C were formed at the interfaces of MC/γ and M₇C₃/γ, respectively. As the homogenisation temperature increased from 1150 to 1230 °C, the value of microhardness gradually decreased from 771 to 740 HV. Nevertheless, the standard deviation value decreased first and then increased, which reached the minimum 32 HV at 1200 °C, indicating that the hardness homogeneity was the best.

这项研究确定了实验铸态H13钢的均质温度范围是1150至1230°C，同时测试了均质温度范围对显微组织演变和显微硬度的影响。枝晶偏析区合金元素的富集降低了基体的固相线温度，其总含量决定了最大均质温度。次生枝晶分支在1150°C时溶解最多，在偏析区在1230°C出现过热。此外，初级碳化物经历了收缩，钝化，破碎和溶解。二次碳化物中号₂₃ Ç ₆和M ₆ C下在MC的界面形成/γ和M ₇ C ^₃ /γ。随着均质温度从1150℃升高到1230℃，显微硬度值从771 HV逐渐降低到740 HV。然而，标准偏差值先下降然后上升，在1200°C时达到最低32 HV，表明硬度均匀性最佳。