Hot deformation behaviors of a 9Cr oxide dispersion-strengthened steel and its microstructure characterization

Yu Shao; Li-ming Yu; Yong-chang Liu; Zong-qing Ma; Hui-jun Li; Jie-feng Wu

doi:10.1007/s12613-019-1768-y

Volume 26 Issue 5

May 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(5): 597-610

Yu Shao, Li-ming Yu, Yong-chang Liu, Zong-qing Ma, Hui-jun Li, and Jie-feng Wu, Hot deformation behaviors of a 9Cr oxide dispersion-strengthened steel and its microstructure characterization, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 597-610. https://doi.org/10.1007/s12613-019-1768-y

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Yu Shao, Li-ming Yu, Yong-chang Liu, Zong-qing Ma, Hui-jun Li, and Jie-feng Wu, Hot deformation behaviors of a 9Cr oxide dispersion-strengthened steel and its microstructure characterization, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 597-610. https://doi.org/10.1007/s12613-019-1768-y

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Research Article

Hot deformation behaviors of a 9Cr oxide dispersion-strengthened steel and its microstructure characterization

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Corresponding authors:
Li-ming Yu E-mail: lmyu@tju.edu.cn

Yong-chang Liu E-mail: ycliu@tju.edu.cn
Received: 21 August 2018; Revised: 19 December 2018; Accepted: 27 December 2018

Abstract

Abstract

The hot deformation behaviors of a 9Cr oxide dispersion-strengthened (9Cr-ODS) steel fabricated by mechanical alloying and hot isostatic pressing (HIP) were investigated. Hot compression deformation experiments were conducted on a Gleeble 3500 simulator in a temperature range of 950-1100℃ and strain rate range of 0.001-1 s^-1. The constitutive equation that can accurately describe the relationship between the rheological stress and the strain rate of the 9Cr-ODS steel was established, and the deformation activation energy was calculated as 780.817 kJ/mol according to the data obtained. The processing maps of 9Cr-ODS in the strain range of 0.1-0.6 were also developed. The results show that the region with high power dissipation efficiency corresponds to a completely recrystallized structure. The optimal processing conditions were determined as a temperature range of 1000-1050℃ with strain rate between 0.003 and 0.01 s^-1.
- hot deformation;
- constitutive equations;
- processing maps;
- microstructural evolution

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