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Formability prediction of interstitial-free steel via miniaturized tensile specimen for Rapid Alloy Prototyping

Lintao Zhang, Will Harrison Orcid Logo, Talal Abdullah, Shahin Mehraban, Nicholas Lavery Orcid Logo

Applied Mathematical Modelling, Volume: 124, Pages: 713 - 733

Swansea University Authors: Lintao Zhang, Will Harrison Orcid Logo, Talal Abdullah, Shahin Mehraban, Nicholas Lavery Orcid Logo

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DOI (Published version): 10.1016/j.apm.2023.08.022

Abstract

This study aims to investigate the feasibility of using non-standard miniaturized tensile specimens (MTS) to characterize the formability features of interstitial-free (IF) steel, specifically DX57 steel. The motivation behind this research is to gain insight into the accuracy of predicted values fo...

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Published in: Applied Mathematical Modelling
ISSN: 0307-904X
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa64105
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Abstract: This study aims to investigate the feasibility of using non-standard miniaturized tensile specimens (MTS) to characterize the formability features of interstitial-free (IF) steel, specifically DX57 steel. The motivation behind this research is to gain insight into the accuracy of predicted values for the steel's formability using the designed non-standard MTS, which could potentially be used to test materials obtained from rapid alloy prototyping (RAP) routines. Tensile tests were conducted using both standard bars and non-standard MTS with different angles to the rolling directions (0°, 45°, and 90°) and the experiment results were used to determine the material properties for the following numerical simulations, which were based on the cross-die deep drawing concept. The results show that the non-standard MTS over-predicted the strain hardening exponent compared to the values obtained from the standard tensile bars. For the same punch stroke, the non-standard miniatured tensile specimen under-predicted the punch force. However, for the deformed blank, the thickness variation along different paths was compared, and the maximum thickness value difference was found to be less than 5%. In terms of the forming limit diagram (FLD), the MTS's prediction is very close to the standard test-piece's prediction; the overall major-minor strain status of the deformed blank is similar. The results of this research provide confidence in the ability to evaluate formability from small-scale tensile tests for heterogeneous alloys such as synthetic IF steels developed during RAP.
Keywords: Steel development, Rapid alloy prototyping, Cross-die deep drawing, Interstitial-free steel, Forming limit diagram
College: Faculty of Science and Engineering
Funders: The authors would like to thank EPSRC for funding the Rapid Alloy Prototyping Prosperity Partnership project (EP/S005218/1 - ACCELERATING ALLOY DEVELOPMENT THROUGH DELIVERING NOVEL PROTOTYPING SOLUTIONS) which made this work possible. The authors would also like to thank the Welsh Government, European Regional Development Fund (ERDF) and SMART Expertise Wales for funding Materials Advanced Characterisation Centre (MACH1) where the work was carried out.
Start Page: 713
End Page: 733

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