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Lookup NU author(s): Dr Hemantha Yeddu
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The kinetics of reversed austenite formation in 301 stainless steel and its effect on the deformation of an automobile front bumper beam are studied by using modelling approaches at different length scales. The diffusion-controlled reversed austenite formation is studied by using the JMAK model, based on the experimental data. The model can be used to predict the volume fraction of reversed austenite in a temperature range of 650 - 750 C. A 3D elastoplastic phase-field model is used to study the diffusionless shear-type reversed austenite formation in 301 steel at 760 C. The phase-field simulations show that reversion initiates at martensite lath boundaries and proceeds inwards of laths due to the high driving force at such high temperature. The effect of reversed austenite (RA) on the deformation of a bumper beam subjected to front and side impacts is studied by using finite element (FE) analysis. The FE simulations show that the presence of reversed austenite increased the critical speed at which the beam yielded and failed. RA fraction also affects the performance of the bumper beam.
Author(s): Green SL, Yeddu HK
Publication type: Article
Publication status: Published
Journal: Journal of Engineering Materials and Technology
Print publication date: 01/07/2021
Online publication date: 04/03/2021
Acceptance date: 02/02/2021
Date deposited: 14/02/2021
ISSN (print): 0094-4289
ISSN (electronic): 1528-8889
Publisher: ASME: the American Society of Mechanical Engineers
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