University of Oulu

Khorshidi, H., Kermanpur, A., Rastegari, H., Ghassemali, E., & Somani, M. C. (2021). Design of a hot deformation processing map for a Ni-free, N-bearing austenitic stainless steel. Materials Today Communications, 27, 102352.

Design of a hot deformation processing map for a Ni-free, N-bearing austenitic stainless steel

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Author: Khorshidi, H.1; Kermanpur, A.1; Rastegari, H.2;
Organizations: 1Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
2Department of Mechanical and Materials Engineering, Birjand University of Technology, South Khorasan, 97198-66981, Iran
3Department of Materials and Manufacturing, School of Engineering, Jönköping University, Jönköping, Sweden
4Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, 90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2021
Publish Date: 2023-04-22


The hot deformation characteristics of a FeCrMnN austenitic stainless steel containing 0.28 wt.% nitrogen (N) was investigated by hot compression tests using a Gleeble simulator in the temperature range of 800−1200 °C and at constant true strain rates of 0.01–10 s−1 with all specimens deformed to ∼0.9 true strain. The influence of deformation conditions on microstructural mechanisms and phase transformations was characterized. A processing map based on dynamic materials modelling (DMM) was designed and interpreted for predicting the domain of stable flow for safe, defect-free hot deformation. The results revealed the occurrence of dynamic recrystallization (DRX) in a domain extending over the temperature and strain rate ranges of 1100−1200 °C and 0.1–1 s−1, respectively, with the efficiency of power dissipation (η) of 45–55 %. Decreasing temperature and increasing strain rate led to a reduction in DRX grain size following microstructural reconstitution. Another small deterministic domain of 820−1000 °C and 0.01−0.05 s−1 was identified showing occurrence of partial DRX in shear bands leading to formation of a mixed microstructure. The instability criteria delineated the regime of unstable flow covering a large part of the processing map extending over low temperatures (800−950 °C) and high strain rates (0.1–10 s−1) that must be avoided during processing.

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Series: Materials today communications
ISSN: 2352-4928
ISSN-E: 2352-4928
ISSN-L: 2352-4928
Volume: 27
Article number: 102352
DOI: 10.1016/j.mtcomm.2021.102352
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Copyright information: © 2021 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license