Effects of deep cryogenic treatment on the microstructure evolution, mechanical and thermal fatigue properties of H13 hot work die steel

被引:16
作者
Li, Jun [1 ]
Zhang, Xu [2 ]
Bu, Hengyong [1 ]
Qi, Huarong [1 ]
Zuo, Pengpeng [3 ]
Li, Shaohong [1 ]
Li, Mengnie [1 ]
机构
[1] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming, Yunnan, Peoples R China
[2] BYD Auto Ind Co Ltd, Zhengzhou, Henan, Peoples R China
[3] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang, Jiangsu, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 27卷
基金
中国国家自然科学基金;
关键词
Deep cryogenic treatment; Thermal fatigue; Microstructural evolution; Crack propagation; Numerical simulation; WEAR-RESISTANCE; CARBIDE PRECIPITATION; AISI-H13; STEEL; SIMULATION; BEHAVIOR; TOOL; TRANSFORMATION; CRACKING; ALLOYS; FIELD;
D O I
10.1016/j.jmrt.2023.11.236
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The service life of hot work die steel is significantly influenced by its microstructure and thermal fatigue properties. This paper explores the impact of deep cryogenic treatment (DCT) on H13 hot work die steel's microstructural evolution and mechanical as well as thermal fatigue properties. The results demonstrate that a portion of unstable retained austenite transforms into martensite during deep cryogenic treatment and numerous finely dispersed carbides precipitate from the matrix, thereby enhancing hardness. Analysis of the average crack length and distribution of thermal fatigue test samples reveals that the average crack length and crack density of DCT-treated samples are lower than those of non-DCT-treated samples. Thermal fatigue cracks in the specimens primarily originated from trigeminal grain boundaries and the carbides are found at the crack tips. DCT facili-tates the precipitation of fine and dispersed carbides, imparting a robust pinning effect on boundary migration and thereby impeding the initiation and propagation of thermal fatigue cracks. Furthermore, deep cryogenic treatment results in a reduction in the number of M23C6 type carbides with large particles and an increase in smaller M6C type carbides during the thermal fatigue test. This indicates a positive influence on the carbide distribution and further contributes to the improved thermal fatigue resistance of the hot work die steel.
引用
收藏
页码:8100 / 8118
页数:19
相关论文
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