TY - JOUR
T1 - Formation of core-shell type structure in Duplex Martensitic Steel
AU - Kaneko, Kenji
AU - Maeda, Takuya
AU - Kawahara, Yasuhito
AU - Ichino, Kazuhiro
AU - Masumura, Takuro
AU - Tsuchiyama, Toshihiro
AU - Shirahata, Hiroyuki
AU - Uemori, Ryuji
N1 - Funding Information:
The authors would like to thank the Japan Science and Technology Agency (JST) for support (JST-CREST Grant Number JPMJCR18R2). This work was partly supported by JSPS KAKENHI Grant Numbers JP 18K18953. The authors wish to acknowledge the facilities, and the scientific and technical assistance, of the Ultramicroscopy Research Center (URC) of Kyushu University.
Publisher Copyright:
© 2020
PY - 2021/3/1
Y1 - 2021/3/1
N2 - Microstructures of both as-quenched and intercritical-annealed medium-Mn steel were investigated by transmission electron microscopy to acquire a better understanding of γ–ɛ and γ–α′ martensitic transformations. The orientation relationships among each phases were determined as (1¯10)α′//(0001)ε,[111]α′//[112¯0]ε for the case of as-quenched sample, and (1¯10)α′//(1¯11)γ//(0001)ε,[111]α′//[110]γ//[112¯0]ε for the case of intercritical-annealed sample, respectively. In addition, the presences of core-shell type microstructures with the gradient of Mn concentration were confirmed with ɛ–martensite being surrounded by retained γ. Mn concentration of each phase was found dependent on the growth of reversed γ controlled by Mn diffusion during intercritical annealing. It was strongly suggested that the gradient of Mn concentration occurred during intercritical annealing affected the phase stability, which resulted in the formation of ε/γ core-shell microstructures.
AB - Microstructures of both as-quenched and intercritical-annealed medium-Mn steel were investigated by transmission electron microscopy to acquire a better understanding of γ–ɛ and γ–α′ martensitic transformations. The orientation relationships among each phases were determined as (1¯10)α′//(0001)ε,[111]α′//[112¯0]ε for the case of as-quenched sample, and (1¯10)α′//(1¯11)γ//(0001)ε,[111]α′//[110]γ//[112¯0]ε for the case of intercritical-annealed sample, respectively. In addition, the presences of core-shell type microstructures with the gradient of Mn concentration were confirmed with ɛ–martensite being surrounded by retained γ. Mn concentration of each phase was found dependent on the growth of reversed γ controlled by Mn diffusion during intercritical annealing. It was strongly suggested that the gradient of Mn concentration occurred during intercritical annealing affected the phase stability, which resulted in the formation of ε/γ core-shell microstructures.
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U2 - 10.1016/j.scriptamat.2020.10.044
DO - 10.1016/j.scriptamat.2020.10.044
M3 - Article
AN - SCOPUS:85095408965
VL - 193
SP - 112
EP - 116
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
ER -