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

Min Chul Jo; Jisung Yoo; Min Cheol Jo; Alireza Zargaran; Seok Su Sohn; Nack J. Kim; Sunghak Lee

doi:10.1016/j.jmst.2020.01.021

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

Min Chul Jo, Jisung Yoo, Min Cheol Jo, Alireza Zargaran, Seok Su Sohn, Nack J. Kim, Sunghak Lee

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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.

Original language	English
Pages (from-to)	44-51
Number of pages	8
Journal	Journal of Materials Science and Technology
Volume	43
DOIs	https://doi.org/10.1016/j.jmst.2020.01.021
Publication status	Published - 2020 Apr 15

Keywords

Cu effects
Cu-rich FCC phase
Formability
High-Mn steel
Hole-expansion test
Stretch-flangeablity
Surface delamination

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics
Metals and Alloys
Materials Chemistry

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

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.",

keywords = "Cu effects, Cu-rich FCC phase, Formability, High-Mn steel, Hole-expansion test, Stretch-flangeablity, Surface delamination",

author = "Jo, {Min Chul} and Jisung Yoo and Jo, {Min Cheol} and Alireza Zargaran and Sohn, {Seok Su} and Kim, {Nack J.} and Sunghak Lee",

note = "Funding Information: This work was supported by the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government ( MOTIE ) (Grant No. P0002019 ), by the Korea University Grant for the fifth author, and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = apr,

day = "15",

doi = "10.1016/j.jmst.2020.01.021",

language = "English",

volume = "43",

pages = "44--51",

journal = "Journal of Materials Science and Technology",

issn = "1005-0302",

publisher = "Chinese Society of Metals",

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TY - JOUR

T1 - Effects of Cu addition on formability and surface delamination phenomenon in high-strength high-Mn steels

AU - Jo, Min Chul

AU - Yoo, Jisung

AU - Jo, Min Cheol

AU - Zargaran, Alireza

AU - Sohn, Seok Su

AU - Kim, Nack J.

AU - Lee, Sunghak

N1 - Funding Information: This work was supported by the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government ( MOTIE ) (Grant No. P0002019 ), by the Korea University Grant for the fifth author, and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. Publisher Copyright: © 2020

PY - 2020/4/15

Y1 - 2020/4/15

N2 - 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.

AB - 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.

KW - Cu effects

KW - Cu-rich FCC phase

KW - Formability

KW - High-Mn steel

KW - Hole-expansion test

KW - Stretch-flangeablity

KW - Surface delamination

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DO - 10.1016/j.jmst.2020.01.021

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JO - Journal of Materials Science and Technology

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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