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Hot Deformation Behavior and Microstructure Evolution of 14Cr ODS Steel

State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, China
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Materials 2018, 11(6), 1044; https://doi.org/10.3390/ma11061044
Received: 21 May 2018 / Revised: 9 June 2018 / Accepted: 11 June 2018 / Published: 20 June 2018
Hot deformation tests of 14Cr oxide dispersion strengthened (ODS) steel fabricated by mechanical alloying and hot isostatic pressing (HIP) were performed on a Gleeble-1500D simulator at temperatures ranging from 1050 to 1200 °C with the strain rate range of 0.001−1 s−1. The relationship between the rheological stress and the deformation condition was studied, and a processing map at the true strain of 0.5 was proposed. Microstructure evolution during the deformation process and the effects of deformation conditions on microstructures were also investigated, as well as the stability of nanoparticles. Results show that the 14Cr ODS steel possesses positive strain rate sensitivity. The flow stress increases with the decrease of deformation temperature and the increase of strain rate. The recrystallization process is promoted by the increase of deformation temperature and the reduction of strain rate. Nanoparticles possess excellent stability during the deformation process and are coherent with the matrix. View Full-Text
Keywords: ODS steel; hot deformation; constitutive equation; microstructure evolution; nanoparticles ODS steel; hot deformation; constitutive equation; microstructure evolution; nanoparticles
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MDPI and ACS Style

Zhao, Q.; Yu, L.; Ma, Z.; Li, H.; Wang, Z.; Liu, Y. Hot Deformation Behavior and Microstructure Evolution of 14Cr ODS Steel. Materials 2018, 11, 1044.

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