High Temperature Deformation Characteristics of an Alumina-Forming Stainless Steel

Rui Luo, Yutong Yang, Huakang Bian, Leli Chen, Lingxiao Ouyang, Ching Tun Peng, Pei Gao, Guifang Xu, Xiaonong Cheng

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This investigation study deformation characteristics of an innovative stainless steel, alumina-forming austenitic (AFA) Fe–20Cr–30Ni–0.6Nb–2Al–Mo steel, at elevated temperature, and those isothermal hot compression tests are performed with various temperatures and strain rates. The results show that as the temperature decreases (or as strain rate rised), the stress level increases. On the other hand, in order to better predict the flow stress behavior, a modified constitutive relationship model is established based on the strain-compensated Arrhenius-type equation, and the accuracy of this modified model is examined statistically. Furthermore, by comparing with the experimental results, this modified constitutive model is proved to be able to precisely predict the high temperature flow behaviors of the AFA alloy. In addition, processing maps of this alloy are also constructed, and expanded instability regions are found with higher strain rate values (above 0.18 s−1). Moreover, from the microstructure characterization, the features of both adiabatic shear bands and flow localization are formed in those samples of instability regions. Eventually, the optimum high temperature deformation parameters can be determined as 1050–1120 0.01–0.1 s−1 and 1120–1150 °C/10−0.5–10−1.5 s−1 for this AFA alloy.

Original languageEnglish
Article number1900022
JournalSteel Research International
Volume90
Issue number7
DOIs
Publication statusPublished - 2019 Jul

Keywords

  • alumina-forming austenitic steel
  • deformation characteristics
  • microstructure
  • processing map
  • strain compensation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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