| Synergistic alloying effects on nanoscale precipitation and mechanical properties of ultrahigh-strength steels strengthened by Ni3Ti, Mo-enriched, and Cr-rich co-precipitates | |
| Niu, M. C.1,2,3; Yin, L. C.4; Yang, K.2; Luan, J. H.5; Wang, W.2; Jiao, Z. B.3,6 | |
| Corresponding Author | Wang, W.(wangw@imr.ac.cn) ; Jiao, Z. B.(zb.jiao@polyu.edu.hk) |
| 2021-05-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 209Pages:13 |
| Abstract | The synergistic effects of Mo, Ti, and Cr on nanoscale precipitation and mechanical properties of marag-ing stainless steels were systematically studied using high-resolution scanning transmission electron mi-croscopy, atom probe tomography (APT), thermodynamic and first-principles calculations, and mechani-cal tests. Our results reveal a notable precipitation pathway involving the co-precipitation of Ni3Ti, Mo-enriched, and Cr-rich precipitates; their formations are not separated, but rather highly interacted. The APT results indicate that Mo partitions to the Ni3Ti precipitate core in the early stage of precipitation, which doubles the number density of Ni3Ti precipitates. Our calculations indicate that the Mo parti-tioning not only increases the chemical driving force, but also reduces the strain energy for nucleation, thereby accelerating N(i)3Ti precipitation. As the precipitation proceeds, Mo atoms are rejected from the Ni3Ti precipitate core to the interface between the Ni3Ti precipitates and matrix, which leads to the het-erogeneous nucleation of Mo-enriched precipitates on the outer surface of the Ni3Ti precipitates. This results in a substantial size refinement of Mo-enriched precipitates. In addition, the formation of Ni3Ti precipitates consumes Ni from the matrix, which substantially inhibits the spinodal decomposition and refines the size of Cr-rich precipitates. The cooperative strengthening of Ni3Ti, Mo-enriched, and Cr-rich co-precipitates leads to the development of new steels with a strength of 1.8 GPa; the contributions of these precipitates to the strengthening were quantitatively evaluated in terms of precipitate shearing and Orowan dislocation looping mechanisms. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| Keyword | maraging steel precipitation microstructure evolution mechanical property |
| Funding Organization | National Natural Science Foundation of China ; State Key Laboratory for Advanced Metals and Materials Open Fund ; Guangzhou International Science & Technology Cooperation Program ; Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch) at PolyU ; Youth Innovation Promotion Association of Chinese Academy of Sciences ; Innovation Project of Institute of Metal Research ; National Natural Science Foundation of China Research Fund for International Young Scientists |
| DOI | 10.1016/j.actamat.2021.116788 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51801169] ; National Natural Science Foundation of China[51472249] ; State Key Laboratory for Advanced Metals and Materials Open Fund[2017ZD01] ; Guangzhou International Science & Technology Cooperation Program[201907010026] ; Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch) at PolyU[P0013862] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017233] ; Innovation Project of Institute of Metal Research[2015-ZD04] ; National Natural Science Foundation of China Research Fund for International Young Scientists[51750110515] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000641587700010 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/161702 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang, W.; Jiao, Z. B. |
| Affiliation | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 5.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China 6.Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China |
| Recommended Citation GB/T 7714 | Niu, M. C.,Yin, L. C.,Yang, K.,et al. Synergistic alloying effects on nanoscale precipitation and mechanical properties of ultrahigh-strength steels strengthened by Ni3Ti, Mo-enriched, and Cr-rich co-precipitates[J]. ACTA MATERIALIA,2021,209:13. |
| APA | Niu, M. C.,Yin, L. C.,Yang, K.,Luan, J. H.,Wang, W.,&Jiao, Z. B..(2021).Synergistic alloying effects on nanoscale precipitation and mechanical properties of ultrahigh-strength steels strengthened by Ni3Ti, Mo-enriched, and Cr-rich co-precipitates.ACTA MATERIALIA,209,13. |
| MLA | Niu, M. C.,et al."Synergistic alloying effects on nanoscale precipitation and mechanical properties of ultrahigh-strength steels strengthened by Ni3Ti, Mo-enriched, and Cr-rich co-precipitates".ACTA MATERIALIA 209(2021):13. |
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