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

Journal Article


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.

Publication Date


  • 2019

Citation


  • Gao, Q., Zhang, H., Li, H., Zhang, X., Qu, F., Jiang, Y., . . . Jiang, C. (2019). Hot deformation of alumina-forming austenitic steel: EBSD study and flow behavior. Journal of Materials Science, 54(11), 8760-8777. doi:10.1007/s10853-019-03513-9

Scopus Eid


  • 2-s2.0-85062656776

Start Page


  • 8760

End Page


  • 8777

Volume


  • 54

Issue


  • 11

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.

Publication Date


  • 2019

Citation


  • Gao, Q., Zhang, H., Li, H., Zhang, X., Qu, F., Jiang, Y., . . . Jiang, C. (2019). Hot deformation of alumina-forming austenitic steel: EBSD study and flow behavior. Journal of Materials Science, 54(11), 8760-8777. doi:10.1007/s10853-019-03513-9

Scopus Eid


  • 2-s2.0-85062656776

Start Page


  • 8760

End Page


  • 8777

Volume


  • 54

Issue


  • 11