Delamination toughening in a low carbon microalloyed steel plate rolled in the dual-phase region

Journal article (2019)

Authors

X. J. Shen Northeastern University China
D. Z. Li Northeastern University China
S. Tang Northeastern University China
J Chen Northeastern University China
H. Fang RST/Fundamental Aspects of Materials and Energy - AS , Novel Aerospace Materials - Aerospace Engineering
G. D. Wang Northeastern University China
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2019 X. J. Shen, D. Z. Li, S. Tang, J. Chen, H. Fang, G. D. Wang
DOI
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https://doi.org/10.1016/j.msea.2019.138342
Crystallographic texture Delamination toughening Elongated and ultrafine-grained microstructure Steel plates
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Published Date

24-10-2019

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

It is still a big challenge to obtain excellent low-temperature toughness for bulk steel materials. Delamination is an effective method to improve low-temperature toughness. In the present study, delamination toughening in a low carbon microalloyed steel plate with elongated and ultrafine-grained microstructure rolled in the dual-phase region has been investigated in detail. When toughness was measured along normal direction, the steel plate had a high upper shelf energy and no delamination occurred in the upper shelf region. A large delaminated crack parallel to rolling plane started to appear and changed the propagation path of main crack when testing temperature was lower than −60 °C. We find this kind of delamination induces a second upper shelf in the Charpy transition–temperature curve. The second upper shelf, reaching up to 300 J in the temperature range of −60 °C to −140 °C, results in excellent low-temperature toughness for the steel plate, and the ductile-brittle transition temperature is lowered to −157 °C. The developed steel plate also has high low-temperature toughness measured along transverse direction due to delamination. The effect factors on upper shelf energy, delamination mechanism and delamination toughening are discussed.