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Phase-field modeling of austenite grain size effect on martensitic transformation in stainless steels

Lookup NU author(s): Dr Hemantha Yeddu

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Abstract

A 2D elastoplastic phase-field model is developed to study the effect of prior austenite grain size on martensitic microstructure evolution in stainless steel. The effects of strain hardening and strengthening by grain size reduction (Hall-Petch effect) have been included in the model. The results show that martensite units form in different packets oriented in different crystallographic directions in simulated coarse grains, whereas uni-directional martensitic growth is observed in simulated fine grains. The number of packets and martensite block width increase with increasing grain size. With a decreasing grain size the martensitic transformation start temperature decreases, indicating strengthening of austenite. Once the transformation is initiated, at a given time, simulated fine grains give rise to higher volume fraction of martensite compared to simulated coarse grains. The von Mises equivalent stress and plastic strain are large in simulated fine grains compared to those in simulated coarse grains. The simulation results are in good agreement with experimental results.

Publication metadata

Author(s): Yeddu HK

Publication type: Article

Publication status: Published

Journal: Computational Materials Science

Year: 2018

Volume: 154

Pages: 75-83

Print publication date: 01/11/2018

Online publication date: 26/07/2018

Acceptance date: 20/07/2018

Date deposited: 23/07/2018

ISSN (print): 0927-0256

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.commatsci.2018.07.040

DOI: 10.1016/j.commatsci.2018.07.040

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