Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel

doi:10.1016/j.jmrt.2020.05.002

IMR OpenIR

	Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel
	Sun, Chen; Fu, Pai-Xian; Ma, Xiao-Ping; Liu, Hang-Hang; Du, Ning-Yu; Cao, Yan-Fei; Liu, Hong-Wei; Li, Dian-Zhong
	2020-07-08
Source Publication	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume	9 Issue:4 Pages:7701-7710
Abstract	Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) steels with different initial states of tempering, including lath martensite microstructures and matrix carbon contents. The effects of these factors on the tempered carbides and impact toughness of the MCLA steels were investigated via optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the matrix carbon content and lath martensite substructure sizes could be effectively controlled by the austenitizing temperature. The morphologies of the tempered carbides precipitated at the boundaries were controlled by both the matrix carbon content and the lath marten site substructure sizes. Higher matrix carbon content and boundary densities increased the nucleation rate and promoted the formation of spherical carbides. The spheroidization of carbides was conducive to improving the impact toughness. However, the decrease in the density of high-angle grain boundaries and the appearance of long strip-shaped carbides drastically reduced the impact toughness. (C) 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
DOI	10.1016/j.jmrt.2020.05.002
WOS ID	WOS:000556875600007
Citation statistics
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/82725
Collection	中国科学院金属研究所
Recommended Citation GB/T 7714	Sun, Chen,Fu, Pai-Xian,Ma, Xiao-Ping,et al. Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2020,9(4):7701-7710.
APA	Sun, Chen.,Fu, Pai-Xian.,Ma, Xiao-Ping.,Liu, Hang-Hang.,Du, Ning-Yu.,...&Li, Dian-Zhong.(2020).Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,9(4),7701-7710.
MLA	Sun, Chen,et al."Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 9.4(2020):7701-7710.

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