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Dependency of Portevin-LeChatelier Effect and Microstructure Characteristics of 9Cr ODS Steels on Strain Rates Upon Hot Deformation

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Abstract

The flow stress and microstructure evolution of 9Cr oxide dispersion strengthened (ODS) steels were investigated by isothermal compression at 1000–1150 oC with strain rates from 0.001 to 1 s− 1. Microstructure characteristics of ODS steels under various condition were studied using the EBSD and TEM techniques. At each deformation temperature, PortevinLe--Chatelier (PLC) effect characteristics of repeated serrated stress was observed, as the strain rates were 0.01, 0.1 and 1 s− 1. The serrations fluctuated about the mean flow curve in quick succession, and the critical strain for the PLC effect was related to both the deformation temperature and strain rates. The stress drops at strain rates of 0.01 and 0.1 s− 1 were smaller than those at 1 s− 1. The strain rate affected the dynamic recovery and recrystallization of austenite grains, as well as the texture components of martensite transformed from austenite. Cap-shaped oxide particles in as-fabricated and hot deformed steels were characterized in detail. The cap parts of cap-shaped oxide particles were depleted of alloying elements, and the caps were crystal or amorphous. Large-sized oxide particles were easier to be deformed than small-sized ones. Despite of the oxide deformation, the PLC effect was still suggested to be related to the solute-dislocation interaction.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (Granted No. 52101157 and 52005456), the Shanxi Provincial Key Research and Development Project (Granted No. 202202050201016) and Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (Granted No. 20210040) for grant and financial support.

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Authors and Affiliations

  1. Shanxi Key Laboratory of Intelligent Equipment Technology in Harsh Environment, School of Mechanical Engineering, North University of China, 030051, Taiyuan, China

    Xiaosheng Zhou, Guodong Li, ZhenYa Chen & Huang Zhang

  2. Material Science Research Center, Xingtai University, Xingtai, 054001, China

    Yaran Zhang

  3. Luoyang Ship Material Research Institute, Luoyang, 471023, China

    Yanmo Li

  4. College of Mechatronic Engineering, North University of China, Taiyuan, 030051, China

    Meini Yuan

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  1. Xiaosheng Zhou
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Zhou, X., Zhang, Y., Li, Y. et al. Dependency of Portevin-LeChatelier Effect and Microstructure Characteristics of 9Cr ODS Steels on Strain Rates Upon Hot Deformation. Met. Mater. Int. 30, 182–193 (2024). https://doi.org/10.1007/s12540-023-01482-y

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