Title: Quantitative study of the Bauschinger effect in high-strength low-strain-hardening materials for metal forming applications

Authors: ManSoo Joun; Soontae Ahn; Hotae Jin; Yoheon Son; Dukjae Yoon

Addresses: School of Mechanical Engineering, Engineering Research Institute, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea ' Samhwa Steel, R&D Center, 704, Gongdan-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, Republic of Korea ' Department of Mechanical Engineering, Gyeongsang National University, 501, Jinju-daero, Jinju-si, Gyeongsangnam-do, Republic of Korea ' Youngsin Metal Industrial Co., Ltd., Ansan, Republic of Korea ' Korea Institute of Industrial Technology, Incheon, Republic of Korea

Abstract: In this paper, an experimental study of the Bauschinger effect is carried out in high-strength, low-strain-hardening materials. Pre-heat-treated ESW105 steel, which has a high initial yield stress with negligible strain-hardening capability, is employed in this study. For the sake of comparison, the Bauschinger effect is also investigated in SCM435 steel, which has typical strain-hardening capability. The Bauschinger effect tends to decrease the forming load during cylinder compression of an ESW105 workpiece initially elongated via a drawing process with proper reduction of area, but does not contribute to forming load reduction in the case of SCM435, even under the same conditions, since it is surpassed by the strain-hardening capability of the material.

Keywords: Bauschinger effect; drawn specimens; compression tests; high strength materials; strain hardening; metal forming; steel; yield stress; forming load; cylinder compression.

DOI: 10.1504/IJMPT.2017.080564

International Journal of Materials and Product Technology, 2017 Vol.54 No.1/2/3, pp.20 - 31

Received: 15 Jul 2015
Accepted: 26 Oct 2015

Published online: 31 Oct 2016 *

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