Improving mechanical properties and high-temperature oxidation of press hardened steel by adding Cr and Si

Rong Zhu; Yonggang Yang; Baozhong Zhang; Borui Zhang; Lei Li; Yanxin Wu; Zhenli Mi

doi:10.1007/s12613-023-2796-1

Volume 31 Issue 8

Aug. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(8): 1865-1875

Rong Zhu, Yonggang Yang, Baozhong Zhang, Borui Zhang, Lei Li, Yanxin Wu, and Zhenli Mi, Improving mechanical properties and high-temperature oxidation of press hardened steel by adding Cr and Si, Int. J. Miner. Metall. Mater., 31(2024), No. 8, pp. 1865-1875. https://doi.org/10.1007/s12613-023-2796-1

Cite this article as:

Rong Zhu, Yonggang Yang, Baozhong Zhang, Borui Zhang, Lei Li, Yanxin Wu, and Zhenli Mi, Improving mechanical properties and high-temperature oxidation of press hardened steel by adding Cr and Si, Int. J. Miner. Metall. Mater., 31(2024), No. 8, pp. 1865-1875. https://doi.org/10.1007/s12613-023-2796-1

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Research Article

Improving mechanical properties and high-temperature oxidation of press hardened steel by adding Cr and Si

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Corresponding authors:
Yanxin Wu E-mail: zhenli_mi@163.com

Zhenli Mi E-mail: wuyanxin@ustb.edu.cn
Received: 18 September 2023; Revised: 22 November 2023; Accepted: 23 November 2023; Available online: 25 November 2023

Abstract

Abstract

This work investigated the effect of Cr and Si on the mechanical properties and oxidation resistance of press hardened steel. Results indicated that the microstructure of the Cr–Si micro-alloyed press hardened steel consisted of lath martensite, M₂₃C₆ carbides, and retained austenite. The retained austenite and carbides are responsible for the increase in elongation of the micro-alloyed steel. In addition, after oxidation at 930°C for 5 min, the thickness of the oxide scales on the Cr–Si micro-alloyed press hardened steel is less than 5 μm, much thinner than 45.50 μm-thick oxide scales on 22MnB5. The oxide scales of the Cr–Si micro-alloyed steel are composed of Fe₂O₃, Fe₃O₄, mixed spinel oxide (FeCr₂O₄ and Fe₂SiO₄), and amorphous SiO₂. Adding Cr and Si significantly reduces the thickness of the oxide scales and prevents the generation of the FeO phase. Due to the increase of spinel FeCr₂O₄ and Fe₂SiO₄ phase in the inner oxide scale and the amorphous SiO₂ close to the substrate, the oxidation resistance of the Cr–Si micro-alloyed press hardened steel is improved.
- Cr–Si micro-alloyed press hardened steel;
- mechanical properties;
- oxidation resistance;
- amorphous SiO₂

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