揭示静磁场对大规模 H13 热作模具钢中碳化物析出和机械性能的影响

Chengkuan Ma, Mingliang Zhang, Yi Zhang, Zhonghao Sun, Qiang Li, Tianxiang Zheng, Bangfei Zhou, Zhe Shen, Biao Ding, Chunmei Liu, Yunbo Zhong
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引用次数: 0

摘要

为了评估静磁场在电渣重熔大型 H13 钢技术发展中的潜在应用优势,对 H13 钢的碳化物、夹杂物、溶质偏析和力学性能进行了分析。结果表明,采用轴向静磁场(ASMF)后,碳化物的面积分数和尺寸减小,元素(C、Mo、V 和 Cr)的偏析率降低。其原因是,ASMF 的应用可缩短局部凝固时间,减小枝晶间距,减轻枝晶间偏析程度,从而限制了碳化物生成和进一步生长的时间和空间。使用 ASMF 后,H13 钢中的夹杂物越来越少。ASMF改善了夹杂物迁移到渣-金属界面的动力学条件和清除过程,从而使熔滴更小,金属池更浅。此外,锻造退火后的样品表明,使用 ASMF 后,H13 钢的平均晶粒尺寸减小,机械性能显著提高。在没有使用 ASMF 的情况下,强度和伸长率的乘积为 22,599 MPa pct。施加 60 mT ASMF 后,强度和伸长率的乘积增至 28,770 MPa pct。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Unraveling the Influence of Static Magnetic Field on Carbide Precipitation and Mechanical Properties in Large-Scale H13 Hot Work Die Steel

Unraveling the Influence of Static Magnetic Field on Carbide Precipitation and Mechanical Properties in Large-Scale H13 Hot Work Die Steel

In order to evaluate the potential application advantages of static magnetic field on the development of electroslag remelted large-scale H13 steel technology, the carbides, inclusions, solute segregation and mechanical property of H13 steel were analyzed. The results demonstrated that the implementation of axial static magnetic field (ASMF), the area fraction and size of carbides decreased, and the segregation rate of the elements (C, Mo, V and Cr) decreased. The reason is that the application of ASMF could shorter the local solidification time, decrease the dendrite spacing, alleviate the degree of interdendritic segregation, which limits the time and space for the generation and further growth of carbides. After ASMF was applied, there were lesser and smaller inclusions in H13 steel. Smaller droplet and shallower metal pool are the consequence of utilizing ASMF, which improves the kinetic conditions and removal process that inclusions migration to the slag-metal interfaces. Moreover, samples after forged annealing showed that the average grain size of H13 steel decreased when ASMF was applied, which significantly enhances the mechanical properties. In the absence of ASMF, the product of strength and elongation was 22,599 MPa pct. After applying 60 mT ASMF, the product of strength and elongation increased to 28,770 MPa pct.

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