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

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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°C 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°C with strain rate between 0.003 and 0.01 s−1.

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Acknowledgements

This work was financially supported by the International Thermonuclear Experimental Reactor Program Special Project (Nos. 2015GB107003 and 2015GB119001), and the National Natural Science Foundation of China (Nos. 11672200, 51674175, and U1660201), and the Science and Technology Program of Tianjin, China (No. 18YFZCGX00070).

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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin Key Lab of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China

    Yu Shao, Li-ming Yu, Yong-chang Liu, Zong-qing Ma & Hui-jun Li

  2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Jie-feng Wu

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  1. Yu Shao
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Correspondence to Li-ming Yu or Yong-chang Liu.

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Shao, Y., Yu, Lm., Liu, Yc. et al. Hot deformation behaviors of a 9Cr oxide dispersion-strengthened steel and its microstructure characterization. Int J Miner Metall Mater 26, 597–610 (2019). https://doi.org/10.1007/s12613-019-1768-y

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  • DOI: https://doi.org/10.1007/s12613-019-1768-y

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