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Deformation-induced microstructural banding in TRIP steels
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Celottoa, S., Ghadbeigib, H., Pinnab, C., Shollock, Barbara A. and Efthymiadis, Panagiotis (2018) Deformation-induced microstructural banding in TRIP steels. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 49 (7). pp. 2893-2906. doi:10.1007/s11661-018-4650-z ISSN 1073-5623.
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Official URL: https://doi.org/10.1007/s11661-018-4650-z
Abstract
Microstructure inhomogeneities can strongly influence the mechanical properties of Advanced High Strength Steels in a detrimental manner. This study of a Transformation Induced Plasticity (TRIP) steel investigates the effect of pre-existing contiguous grain boundary networks (CGBNs) of hard second-phases and shows how these develop into bands during tensile testing using in-situ observations in conjunction with Digital Image Correlation (DIC). The bands form by the lateral contraction of the soft ferrite matrix, which rotates and displaces the CGBNs of second-phases and the individual features within them to become aligned with the loading direction. The more extensive pre-existing CGBNs that were before the deformation already aligned with the loading direction are the most critical microstructural feature for damage initiation and propagation. They induce micro-void formation between the hard second-phases along them, which coalesce and develop into long macroscopic fissures. The hard phases, retained austenite and martensite, were not differentiated as it was found that the individual phases do not play a role in the formation of these bands. It is suggested that minimizing the presence of CGBNs of hard second-phases in the initial microstructure will increase the formability.
| Item Type: | Journal Article | ||||||||
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| Alternative Title: | |||||||||
| Subjects: | T Technology > TS Manufactures | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Steel | ||||||||
| Journal or Publication Title: | Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science | ||||||||
| Publisher: | Springer New York LLC | ||||||||
| ISSN: | 1073-5623 | ||||||||
| Official Date: | July 2018 | ||||||||
| Dates: |
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| Volume: | 49 | ||||||||
| Number: | 7 | ||||||||
| Page Range: | pp. 2893-2906 | ||||||||
| DOI: | 10.1007/s11661-018-4650-z | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 27 April 2018 | ||||||||
| Date of first compliant Open Access: | 14 September 2018 | ||||||||
| RIOXX Funder/Project Grant: |
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