University of Oulu

Dong, H., Li, Z. C., Somani, M. C., & Misra, R. D. K. (2021). The significance of phase reversion-induced nanograined/ultrafine-grained (Ng/ufg) structure on the strain hardening behavior and deformation mechanism in copper-bearing antimicrobial austenitic stainless steel. Journal of the Mechanical Behavior of Biomedical Materials, 119, 104489. https://doi.org/10.1016/j.jmbbm.2021.104489

The significance of phase reversion-induced nanograined/ultrafine-grained (NG/UFG) structure on the strain hardening behavior and deformation mechanism in copper-bearing antimicrobial austenitic stainless steel

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Author: Dong, H.1; Li, Z. C.2; Somani, M. C.3;
Organizations: 1Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, 500 W. University Avenue, University of Texas at El Paso, El Paso, TX, 79968, USA
2School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
3Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, FI-90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2022020317457
Language: English
Published: Elsevier, 2021
Publish Date: 2023-03-23
Description:

Abstract

The unique concept of phase reversion involving severe deformation of parent austenite into martensite, followed by annealing for a short duration, whereby the strain-induced martensite reverts to austenite, was adopted to obtain nano-grained/ultrafine-grained (NG/UFG) structure in a Cu-bearing biomedical austenitic stainless steel resulting in high strength-high ductility combination. Work hardening and accompanying deformation mechanism are two important aspects that govern the mechanical behavior of biomedical devices. Thus, post-mortem electron microscopy of the strained region was carried out to explore the differences in the deformation mechanisms induced by grain refinement, while the strain hardening behavior was analyzed by Crussard-Jaoul (C-J) analysis of the tensile stress-strain data. The strain hardening behavior consisted of four stages and was strongly affected by grain structure. Twinning-induced plasticity (TWIP) was the governing deformation mechanism in the NG/UFG structure and contributed to good ductility. In striking contrast, transformation-induced plasticity (TRIP) contributed to high ductility in the coarse-grained (CG) counterpart and was the governing strain hardening mechanism. When the grain size is less than ~1 μm, the increase in the strain energy and the austenite stability significantly reduce the possibility of strain-induced martensite transformation such that there is a distinct transition in deformation mechanism from nanoscale twinning in the NG/UFG structure to strain-induced martensite in CG structure. The differences in the deformation mechanisms are explained in terms of austenite stability — strain energy relationship.

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Series: Journal of the mechanical behavior of biomedical materials
ISSN: 1751-6161
ISSN-E: 1878-0180
ISSN-L: 1751-6161
Volume: 119
Article number: 104489
DOI: 10.1016/j.jmbbm.2021.104489
OADOI: https://oadoi.org/10.1016/j.jmbbm.2021.104489
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: R.D.K. Misra gratefully acknowledges financial support from the National Science Foundation, USA through grant number DMR 1602080. M.C. Somani would like to express his gratitude to the Academy of Finland for allowing him to conduct this research under the auspices of the Genome of Steel (Profi3) through project #311934.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2021 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/