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Effect of Ni alloying on the microstructural evolution and mechanical properties of two duplex light-weight steels during different annealing temperatures : experiment and phase-field simulation

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Rahnama, Alireza, Kotadia, Hiren and Sridhar, Seetharaman (2017) Effect of Ni alloying on the microstructural evolution and mechanical properties of two duplex light-weight steels during different annealing temperatures : experiment and phase-field simulation. Acta Materialia, 132 . pp. 627-643. doi:10.1016/j.actamat.2017.03.043

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Official URL: http://dx.doi.org/10.1016/j.actamat.2017.03.043

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Abstract

This paper presents a study of two lightweight steels, Fe-15Mn-10Al-0.8C-5Ni and Fe-15Mn-10Al-0.8C where strength is dependent upon the microstructure of 2nd phase precipitates. We investigate the effects of annealing temperature from 500 °C to 1050 °C on the precipitation of ordered phases size and morphology through phase-field modelling and experimental studies based on laboratory scale annealing and characterization. The chemical composition of carbides and B2 compounds as a function of isothermal annealing temperature and the matrix within which they formed are elucidated in this study. It is found that nano-sized disk-shaped B2 particles form at higher annealing temperatures (e.g. 900 °C and 1050 °C). The simulation results on carbides demonstrated the effects of energetic competition between interfacial energy and elastic strain energy on the morphological evolution of carbides. In addition to that, different ordering behaviours observed depending on the Ni content into the steel. The results demonstrate processing route designed through the phase-field simulations led to a better combination of strength and ductility. The tensile testing results indicate an increase in the strength and elongation when B2 precipitate morphology changes from micro-size faceted shape to nano-size disk-like particles.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lightweight steel -- Microstructure -- Testing
Journal or Publication Title: Acta Materialia
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 1359-6454
Official Date: 15 June 2017
Dates:
DateEvent
15 June 2017Published
21 April 2017Available
18 March 2017Accepted
Volume: 132
Page Range: pp. 627-643
DOI: 10.1016/j.actamat.2017.03.043
Status: Peer Reviewed
Publication Status: Published
Funder: Warwick Manufacturing Group, High Value Manufacturing Catapult

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