University of Oulu

Järvenpää, A., Ghosh, S., Khosravifard, A., Jaskari, M., & Hamada, A. (2021). A new processing route to develop nano-grained structure of a TRIP-aided austenitic stainless-steel using double reversion fast-heating annealing. Materials Science and Engineering: A, 140917. https://doi.org/10.1016/j.msea.2021.140917

A new processing route to develop nano-grained structure of a TRIP-aided austenitic stainless-steel using double reversion fast-heating annealing

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Author: Järvenpää, Antti1; Ghosh, Sumit2; Khosravifard, Ali3;
Organizations: 1Kerttu Saalasti Institute, Future Manufacturing Technologies (FMT), University of Oulu, Pajatie 5, FI-85500, Nivala, Finland
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, 90014, Oulu, Finland
3Metallurgical and Materials Engineering Department, School of Engineering, Shiraz Branch, Islamic Azad University, Box 71993-1, Shiraz, Iran
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202102124684
Language: English
Published: Elsevier, 2021
Publish Date: 2021-02-12
Description:

Abstract

A novel processing route comprising double reversion annealing (DRA) was designed for developing bulk nano-grained (NG) structure of an austenitic stainless steel (Type 301LN). The new processing concept of DRA comprised two subsequent intrinsic type processes i.e., two times cold reductions (∼53 % and 63 %) followed by fast induction heating (∼200 °C/s) and short duration annealing at different temperatures (first at 690 °C/60s and second at 750–900 °C/0.1–1s). The NG structure revealed a remarkable improvement of the mechanical properties compared to the counterparts processed by single reversion annealing. Furthermore, outstanding combination of strength and formability is achieved for the DRA structures, significantly higher than those of high-Mn TWIP steels, low-alloy TRIP steels and 304 stainless steel. For instance, a superior combination of yield strength (∼950–1030 MPa) and formability index (11.8–12.5 mm) obtained after DRA at 750 °C/0.1s and 800°C/1 s, respectively. However, the corresponding values are 300 MPa and 12 mm for TWIP steels, 500 MPa and 10 mm for TRIP steels, and 270 MPa and 12 mm for 304 stainless steel. In order to reveal the effect of DRA on the stretch formability, Erichsen cup testing was conducted of both the initial and DRA steel specimens. Moreover, Erichsen cup testing also simulated by the finite element method (FEM) to survey further details of their deformation.

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Series: Materials science & engineering. A, Structural materials: properties, microstructure and processing
ISSN: 0921-5093
ISSN-E: 1873-4936
ISSN-L: 0921-5093
Volume: In press
Article number: 140917
DOI: 10.1016/j.msea.2021.140917
OADOI: https://oadoi.org/10.1016/j.msea.2021.140917
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Copyright information: © 2021 The Author(s). Published by Elsevier B.V. Under a Creative Commons license, Attribution 4.0 International (CC BY 4.0).
  https://creativecommons.org/licenses/by/4.0/