Recent progress on primary carbides in AISI H13 hot work mold steel

MAO Ming-tao; GUO Han-jie; SUN Xiao-lin; WANG Fei

doi:10.13374/j.issn2095-9389.2018.11.002

Volume 40 Issue 11

Nov. 2018

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Article Navigation > Chinese Journal of Engineering > 2018 > 40(11): 1288-1299

MAO Ming-tao, GUO Han-jie, SUN Xiao-lin, WANG Fei. Recent progress on primary carbides in AISI H13 hot work mold steel[J]. Chinese Journal of Engineering, 2018, 40(11): 1288-1299. doi: 10.13374/j.issn2095-9389.2018.11.002

Citation:

MAO Ming-tao, GUO Han-jie, SUN Xiao-lin, WANG Fei. Recent progress on primary carbides in AISI H13 hot work mold steel[J]. Chinese Journal of Engineering, 2018, 40(11): 1288-1299. doi: 10.13374/j.issn2095-9389.2018.11.002

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Recent progress on primary carbides in AISI H13 hot work mold steel

doi: 10.13374/j.issn2095-9389.2018.11.002

MAO Ming-tao^1,2,3,
GUO Han-jie^{1,2
,
,},
SUN Xiao-lin³,
WANG Fei³

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2) Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China;
3) Central Iron & Steel Research Institute, Beijing 100081, China

Received Date: 2018-05-29

Abstract

Abstract

This paper reviewed the recent development of primary carbides in H13 steel from the aspects of solidification segregation theory, solidification method, production process, and alloy design. The relationship between the production process of H13 steel and the characteristics of primary carbides was clarified. During the solidification of H13 steel, primary carbides can be easily generated by dendritic segregation. The primary carbides in H13 steel can be divided into polygonal, stripy, blocky, and eutectic structures according to the different shapes and can be divided into MC, M₂C, M₇C₃, and M₂₃C₆ according to the different structures. The primary carbides can also be classified as Mo-rich, V-rich, and Ti/Nb-rich carbides according to the different compositions. Primary carbides are detrimental to the performance of H13 steel because cracks can easily form around primary carbides during service of the materials. The widely used methods of controlling the primary carbides in H13 steel under industrial production conditions, including solidification control, modification treatment, high-temperature diffusion of the ingot, and alloy composition optimization, were introduced. Modification treatment and solidification control are able to control the size and quantity of primary carbides but are unable to avoid the precipitation of primary carbides entirely. The stability of primary carbides can be relieved by composition optimization. High-temperature homogenization treatment of ingot is the most important means of controlling primary carbides in H13 steel. However, the heating temperature and holding time need further investigation.
- H13 hot work die steel,
- primary carbide,
- microsegregation,
- precipitation thermodynamics,
- high temperature homogenization,
- composition optimization

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References(24)

References

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