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Effect of Pressure on Dendrite Structure and Characteristics of Carbides during Solidification Process of H13 Die Steel Ingot

机译：H13模钢铸铁凝固过程中碳化物树枝状结构和碳化物特性的影响

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摘要

In this paper, the effect of solidification pressure on the dendrite structure and characteristics of carbides in H13 die steel ingot was investigated by experimental and calculational methods. Based on the effect of pressure on the cooling rate, a formula is proposed to calculate the secondary dendrite arm spacing: λ_2 = 71.45 × R~(-0.37). It is applicable when the maximum value of pressure is around 2 MPa and the cooling rate is between 0.5 and 3 K/s. With increasing pressure from 0.1 to 2 MPa, the effects of pressure on the segregation ratio of V, Mo, Cr and C are little and can be neglected, which caused by the combined effect of equilibrium partition coefficient, diffusion coefficient and cooling rate. Therefore, the characteristics of carbides are determined by the decreasing the secondary dendrite arm spacing and increasing cooling rate with the increment of pressure. With increasing pressure from 0.1 to 2 MPa, the types of carbides are not change, which are MC and M_2C in H13 die steel ingot. Meanwhile, the mean area of carbides decreases obviously with increasing pressure, and the decrement in mean area at the edge is larger than that at the center of ingot.
机译：本文采用实验性和计算方法研究了凝固压力对H13模钢锭型碳化物树突结构和特性的影响。基于压力对冷却速率的影响，提出了一种公式来计算次级树枝状臂间距：λ_2= 71.45×R〜（-0.37）。当压力的最大值约为2MPa时，它适用，冷却速度在0.5和3 k / s之间。随着0.1至2MPa的压力增加，压力对V，Mo，Cr和C的分离比的影响很少，并且可以被忽略，这是由平衡分配系数，扩散系数和冷却速率的综合影响引起的。因此，碳化物的特性通过减小二级树枝架间距和增加压力的增长而确定。随着0.1〜2 MPa的压力增加，碳化物的类型不变化，即H13模钢锭的MC和M_2C。同时，随着压力的增加，碳化物的平均面积显然降低，并且边缘处的平均面积的减小大于铸锭中心的平均区域。

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  • 来源
    《ISIJ international》 |2021年第6期|1889-1898|共10页
  • 作者

    Hongchun ZHU; Huabing LI; Zhiyu HE; Hao FENG; Zhouhua JIANG; Tong HE;

  • 作者单位

    School of Metallurgy Northeastern University Shenyang China;

    School of Metallurgy Northeastern University Shenyang China State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

    School of Metallurgy Northeastern University Shenyang China;

    School of Metallurgy Northeastern University Shenyang China;

    School of Metallurgy Northeastern University Shenyang China State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

    Analysis and Testing Centre Northeastern University Shenyang China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solidification pressure; H13 die steel ingot; dendrite structure; carbides;

    机译：凝固压力;H13模钢锭;树枝状结构;碳化物;

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