TY - JOUR
T1 - Characterization of age hardening mechanism of low-temperature aged low-carbon steel by transmission electron microscopy
AU - Kawahara, Yasuhito
AU - Maeda, Takuya
AU - Kinoshita, Keisuke
AU - Takahashi, Jun
AU - Sawada, Hideaki
AU - Teranishi, Ryo
AU - Kaneko, Kenji
N1 - Funding Information:
One of the authors (YK) would like to acknowledge the Research Fellowship for Young Scientists from the Japan Society for Promotion of Science (JSPS) (JSPS KAKENHI Grant Number JP21J20683). All the authors extend their gratitude to collaborating researcher prof. Tomotsugu Shimokawa from Kanazawa University.
Funding Information:
One of the authors (YK) would like to acknowledge the Research Fellowship for Young Scientists from the Japan Society for Promotion of Science (JSPS) (JSPS KAKENHI Grant Number JP21J20683 ). All the authors extend their gratitude to collaborating researcher prof. Tomotsugu Shimokawa from Kanazawa University.
Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2022/1
Y1 - 2022/1
N2 - Low-temperature aging treatment at 323 K results in the dramatical increase in hardness in low-carbon ferritic steels quenched from 983 K, possibly caused by carbon clusters and/or fine ε-carbides. In this study, transmission electron microscopy (TEM) analysis was carried out to characterize the change of the microstructure during the low-temperature aging treatment. Until the early stage of the peak hardness, the carbon clusters were formed homogeneously with zig-zag structures. At the latter stage of the peak hardness, it was found that the ε-carbides were partially precipitated within the carbon clusters, which suggested that the carbon clusters might have acted as the precursors of ε-carbides. In-situ tensile TEM observations showed that dislocation motions were free-glide type, and carbon clusters and fine-carbides interacted with dislocations via cutting-type. Dislocation interaction force was also evaluated, which suggested that the lattice misfit played as important role of the interaction mechanism.
AB - Low-temperature aging treatment at 323 K results in the dramatical increase in hardness in low-carbon ferritic steels quenched from 983 K, possibly caused by carbon clusters and/or fine ε-carbides. In this study, transmission electron microscopy (TEM) analysis was carried out to characterize the change of the microstructure during the low-temperature aging treatment. Until the early stage of the peak hardness, the carbon clusters were formed homogeneously with zig-zag structures. At the latter stage of the peak hardness, it was found that the ε-carbides were partially precipitated within the carbon clusters, which suggested that the carbon clusters might have acted as the precursors of ε-carbides. In-situ tensile TEM observations showed that dislocation motions were free-glide type, and carbon clusters and fine-carbides interacted with dislocations via cutting-type. Dislocation interaction force was also evaluated, which suggested that the lattice misfit played as important role of the interaction mechanism.
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U2 - 10.1016/j.matchar.2021.111579
DO - 10.1016/j.matchar.2021.111579
M3 - Article
AN - SCOPUS:85119427946
VL - 183
JO - Materials Characterization
JF - Materials Characterization
SN - 1044-5803
M1 - 111579
ER -