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Effects of Cu addition on formability and surface delamination phenomenon in high-strength high-Mn steels

Title
Effects of Cu addition on formability and surface delamination phenomenon in high-strength high-Mn steels
Authors
Jo, Min CheolYoo, JisungJo, Min CheolZargaran, AlirezaSohn, Seok SuKim, Nack J.Lee, Sunghak
Date Issued
Apr-2020
Publisher
JOURNAL MATER SCI TECHNOL
Abstract
The formability of austenitic high-Mn steels is a critical issue in automotive applications under non-uniformly-deformed environments caused by dynamic strain aging. Among austenite stabilizing alloying elements in those steels, Cu has been known as an effective element to enhance tensile properties via controlling the stacking fault energy and stability of austenite. The effects of Cu addition on formability, however, have not been sufficiently reported yet. In this study, the Cu addition effects on formability and surface characteristics in the austenitic high-Mn TRIP steels were analyzed in consideration of inhomogeneous microstructures containing the segregation of Mn and Cu. To reveal determining factors, various mechanical parameters such as total elongation, post elongation, strain hardening rate, normal anisotropy, and planar anisotropy were correlated to the hole-expansion and cup-drawing test results. With respect to microstructural parameters, roles of (Mn,Cu)-segregation bands and resultant Cu-rich FCC precipitates on the formability and surface delamination were also discussed.
URI
http://oasis.postech.ac.kr/handle/2014.oak/103511
ISSN
1005-0302
Article Type
Article
Citation
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, vol. 43, page. 44 - 51, 2020-04
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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