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Hot deformation of alumina-forming austenitic steel: EBSD study and flow behavior

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Abstract

The flow behavior of alumina-forming austenitic steel was studied using axisymmetric hot compression on a Gleeble-3500 thermomechanical simulator. The temperature range was 900–1200 °C, and strain rate range was 0.1–100 s−1. The microstructures after deformation were investigated by electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). The deformation temperature and strain rate have a significant influence on the flow stress. A constitutive equation, describing the flow stress as a function of deformation temperature and strain rate, has been developed, and the hot deformation activation energy was confirmed as 579.4 kJ/mol. Dynamic recrystallization (DRX) progress had been finished after increasing hot deformation temperature to 1100 °C at a strain rate of 100 s−1, leading to the obvious transformation from low-angle grain boundaries (LAGBs) to high-angle grain boundaries (HAGBs), and a relatively stable fraction of HAGBs was obtained. At a strain rate of 100 s−1, the β-fiber at {011}<211> transited to {112}<111> (C orientation), and finally a recrystallized orientation of {100}<100> formed after absolute DRX. GDRX is the primary DRX mechanism, but DDRX mechanism is dominant with the increase in deformation temperature at a high strain rate of 100 s−1.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Numbers: 51871042, 51501034) and the Fundamental Research Funds for the Central Universities (Grant Number: N172304041).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, People’s Republic of China

    Qiuzhi Gao, Xin Zhang, Fu Qu, Yujiao Jiang, Ziyun Liu & Chenchen Jiang

  2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, People’s Republic of China

    Qiuzhi Gao, Xin Zhang, Fu Qu, Yujiao Jiang, Ziyun Liu & Chenchen Jiang

  3. Daotian High Technology Co., Ltd, Qinhuangdao, 066004, People’s Republic of China

    Hailian Zhang

  4. School of Materials Science & Engineering, Tianjin University, Tianjin, 300354, People’s Republic of China

    Huijun Li

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  1. Qiuzhi Gao
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  4. Xin Zhang
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Correspondence to Qiuzhi Gao or Huijun Li.

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Gao, Q., Zhang, H., Li, H. et al. Hot deformation of alumina-forming austenitic steel: EBSD study and flow behavior. J Mater Sci 54, 8760–8777 (2019). https://doi.org/10.1007/s10853-019-03513-9

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