Effects of Cu addition on formability and surface delamination phenomenon in high-strength high-Mn steels
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第8期
论文作者：Min Chul Jo Jisung Yoo Min Cheol Jo Alireza Zargaran Seok Su Sohn Nack J.Kim Sunghak Lee
文章页码：44 - 51
摘 要：The formability of austenitic high-Mn steels is a critical issue in automotive applications under nonuniformly-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.
Min Chul Jo1，Jisung Yoo1，Min Cheol Jo1，Alireza Zargaran2，Seok Su Sohn3，Nack J.Kim2，Sunghak Lee1
1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology3. Department of Materials Science and Engineering, Korea University
摘 要：The formability of austenitic high-Mn steels is a critical issue in automotive applications under nonuniformly-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.
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