Regulation of Microstructure and Properties of 4Cr5MoSiV1 Die Steel by Composite Rolling and Cryogenic Treatment

FENG Meilong; ZHANG Jieqi; SHI Hong

doi:10.3969/j.issn.1674-6457.2025.10.023

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (10) : 224-233. DOI: 10.3969/j.issn.1674-6457.2025.10.023

Refractory Metal Forming

Regulation of Microstructure and Properties of 4Cr5MoSiV1 Die Steel by Composite Rolling and Cryogenic Treatment

FENG Meilong^*, ZHANG Jieqi, SHI Hong

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Abstract

The work aims to explore the impact of different heat treatment temperatures and composite cryogenic treatment on the performance of 4Cr5MoSiV1 die steel, with the goal of optimizing the heat treatment process to achieve a good balance between strength and toughness. After cold rolling deformation, the die steel samples were heat-treated at three different temperatures of 950, 1 000 and 1 050 ℃, followed by composite cryogenic treatment. Scanning Electron Microscopy (SEM), Electron Backscatter Diffraction (EBSD), and Energy Dispersive Spectroscopy (EDS) were employed to observe the microstructure, carbide morphology, and elemental distribution. Tensile testing and hardness measurements were conducted to evaluate the mechanical properties of the samples. As the heat treatment temperature increased, the carbides gradually dissolved into the matrix. The samples treated at 950 ℃ exhibited the best plasticity, while the samples treated at 1 050 ℃ showed the highest strength and hardness, with a tensile strength of 2 GPa and hardness of 640.4HV. The composite cryogenic treatment played a positive role in enhancing mechanical properties, further optimizing carbide precipitation and improving microstructure stability. The results of this study provide a theoretical basis for optimizing the heat treatment process of die steel and offer valuable guidance for their practical use in engineering applications.

Key words

4Cr5MoSiV1 / cryogenic treatment / microstructure / carbides / mechanical properties

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FENG Meilong, ZHANG Jieqi, SHI Hong. Regulation of Microstructure and Properties of 4Cr5MoSiV1 Die Steel by Composite Rolling and Cryogenic Treatment[J]. Journal of Netshape Forming Engineering. 2025, 17(10): 224-233 https://doi.org/10.3969/j.issn.1674-6457.2025.10.023

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Funding

Science and Technology Research Project of Jiangxi Provincial Department of Education (GJJ2404912); Research Project of Jiujiang Vocational and Technical College (2022003)