Exploring the variable ranges of tensile strength of a high-toughness low-alloy CrNiMo steel

doi:10.1016/j.mtcomm.2025.112057

IMR OpenIR

	Exploring the variable ranges of tensile strength of a high-toughness low-alloy CrNiMo steel
	Yang, Mengchong 1,2; Jiang, Zhonghua 2; Jia, Chunni 2; Chen, Xiangjun 2
通讯作者	Jiang, Zhonghua(zhjiang12s@imr.ac.cn) ; Chen, Xiangjun(xjchen@imr.ac.cn)
	2025-03-01
发表期刊	MATERIALS TODAY COMMUNICATIONS
卷号	44 页码:12
摘要	The study systematically investigates the adjustable ranges of tensile strength in a high-toughness low-alloy CrNiMo steel through adjusting the heat-treatment process, as determined by the use of OM, SEM, TEM, XRD, and other material characterization methods. The outcomes demonstrate that the quenched specimen with lath martensite (LM), the tensile strength and -60 degrees C impact toughness of low-alloy CrNiMo steel were the highest, reaching 1233 MPa and 137 J. Subsequent to quenching of specimens with LM tempering at varying temperatures (<= 640 degrees C), the tensile strength of low-alloy CrNiMo steel demonstrated a downward trend, concurrent with a significant enhancement in low-temperature toughness. In the tempering temperature range of 640-680 degrees C, as the martensite matrix dislocation density decreased, the characteristics of its lath structure gradually disappeared. Carbides from the short bar M7C3 partially transformed into spherical carbides M23C6. Furthermore, the intermittent distribution of grain boundaries and laths gradually transformed into a diffuse distribution of ferrite in the matrix. As a result, the distribution of uniformity has been significantly improved,the impact-absorbing energy at -60 degrees C was stabilized at above 300 J. However, when tempered at 680 degrees C, the tensile strength decreased to a minimum of 612 MPa. Further increases in tempering temperature, up to 700 degrees C, resulted in the partial transformation of the tempered martensitic matrix into austenite-rich matrix, accompanied by the formation of brittle fresh martensite during the subsequent tempering process. This led to an enhancement in tensile strength, accompanied by a notable decline in low temperature impact toughness. In this study, the tensile strength of low-alloy CrNiMo steel with lath martensite as the initial microstructure can be adjusted within a wide range of 612-1233 MPa when the -60 degrees C impact-absorbing energy is >= 137 J. This can meet the "one steel for multiple uses" demands for high toughness and varying strength levels of low-alloy steel with the same composition.
关键词	Low-alloy steel M -A islands Impact toughness Carbides Brittle martensite
资助者	National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.mtcomm.2025.112057
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[52101059] ; National Natural Science Foundation of China (NSFC)[52471053] ; National Natural Science Foundation of China (NSFC)[52321001]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:001436146200001
出版者	ELSEVIER
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179739
专题	中国科学院金属研究所
通讯作者	Jiang, Zhonghua; Chen, Xiangjun
作者单位	1.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yang, Mengchong,Jiang, Zhonghua,Jia, Chunni,et al. Exploring the variable ranges of tensile strength of a high-toughness low-alloy CrNiMo steel[J]. MATERIALS TODAY COMMUNICATIONS,2025,44:12.
APA	Yang, Mengchong,Jiang, Zhonghua,Jia, Chunni,&Chen, Xiangjun.(2025).Exploring the variable ranges of tensile strength of a high-toughness low-alloy CrNiMo steel.MATERIALS TODAY COMMUNICATIONS,44,12.
MLA	Yang, Mengchong,et al."Exploring the variable ranges of tensile strength of a high-toughness low-alloy CrNiMo steel".MATERIALS TODAY COMMUNICATIONS 44(2025):12.