| Ultrafine-grained dual-phase maraging steel with high strength and excellent cryogenic toughness | |
| Zhang, Honglin1,2; Sun, Mingyue1,3; Liu, Yuxuan4; Ma, Dongping5; Xu, Bin1,3; Huang, Mingxin4; Li, Dianzhong1; Li, Yiyi1 | |
| Corresponding Author | Sun, Mingyue(mysun@imr.ac.cn) ; Huang, Mingxin(mxhuang@hku.hk) |
| 2021-06-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 211Pages:14 |
| Abstract | 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. |
| Keyword | Maraging steel Precipitation Austenite reversion ultrafine grain APT |
| Funding Organization | 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 |
| DOI | 10.1016/j.actamat.2021.116878 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000670355500003 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/159928 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Sun, Mingyue; Huang, Mingxin |
| Affiliation | 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 |
| Recommended Citation 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. |
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