Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness

doi:10.1016/j.actamat.2021.116878

CORC > 金属研究所 > 中国科学院金属研究所

	Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness
	Zhang, Honglin 1,2; Sun, Mingyue 1,3; Liu, Yuxuan 4; Ma, Dongping 5; Xu, Bin 1,3; Huang, Mingxin 4; Li, Dianzhong 1; Li, Yiyi 1
刊名	ACTA MATERIALIA
	2021-06-01
卷号	211 页码:14
关键词	Maraging steel Precipitation Austenite reversion ultrafine grain APT
ISSN号	1359-6454
DOI	10.1016/j.actamat.2021.116878
通讯作者	Sun, Mingyue(mysun@imr.ac.cn) ; Huang, Mingxin(mxhuang@hku.hk)
英文摘要	A novel heat treatment route consisting of a low-temperature solution followed by an over-aging treatment at 500 degrees C is proposed to develop a high-strength, high-cryogenic-toughness maraging steel by forming an ultrafine-grained martensite (alpha') and austenite (gamma) dual-phase microstructure. Compared to the same maraging steel subjected to the conventional heat treatment with a mostly martensitic microstructure, the present dual-phase microstructure offers a remarkable increase by 12 times of cryogenic impact energy (similar to 140 J at 77 K), while the yield strength is not reduced obviously. A large amount of ultrafine-grained austenite (about 50% volume fraction) are formed in the present steel due to the reversed transformation of martensite to austenite during the over-aging process at 500 degrees C. It is surprised that the present steel with such a high fraction of austenite still possesses a high yield strength comparable to the conventional maraging steel with a mostly martensitic microstructure. Intensive nanoprecipitates are found not only in martensite but also in austenite phases, indicating both phases have high strength. This is confirmed by nanoindentation test, showing similar hardness values in both martensite and austenite phases. Such intensive nanoprecipitates in both phases ensure the high yield strength of the present steel. The excellent cryogenic toughness of the present steel mainly origins from: (i) the pronounced amount of reversed austenite that are intrinsically tough due to their face-centered cubic (fcc) structure; (ii) transformation-induced plasticity (TRIP) toughening as some austenite grains transforming to marten-site during impact test; (iii) the ultrafine-grained structure of both martensite and austenite phases. The present heat treatment route offers a potential solution for processing large engineering components for cryogenic application that require a long heat treatment duration to achieving uniform mechanical properties in the components. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Key R&D Program of China[2018YFA0702900] ; National Key R&D Program of China[2019YFA0209900] ; National Natural Science Foundation of China[U1508215] ; National Natural Science Foundation of China[51774265] ; National Natural Science Foundation of China[U1764252] ; National Science and Technology Major Project of China[2019ZX06004010] ; Key Program of the Chinese Academy of Sciences[ZDRWCN20171] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDC04000000] ; LingChuang Research Project of China National Nuclear Corporation ; Program of CAS Interdisciplinary Innovation Team ; Youth Innovation Promotion Association, CAS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000670355500003
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; National Science and Technology Major Project of China ; Key Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; LingChuang Research Project of China National Nuclear Corporation ; Program of CAS Interdisciplinary Innovation Team ; Youth Innovation Promotion Association, CAS
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/159927]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sun, Mingyue; Huang, Mingxin
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 4.Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China 5.China Aerodynam Res & Dev Ctr, Mianyang 621000, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Honglin,Sun, Mingyue,Liu, Yuxuan,et al. Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness[J]. ACTA MATERIALIA,2021,211:14.
APA	Zhang, Honglin.,Sun, Mingyue.,Liu, Yuxuan.,Ma, Dongping.,Xu, Bin.,...&Li, Yiyi.(2021).Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness.ACTA MATERIALIA,211,14.
MLA	Zhang, Honglin,et al."Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness".ACTA MATERIALIA 211(2021):14.