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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 AuthorWang, W.(wangw@imr.ac.cn) ; Jiao, Z. B.(zb.jiao@polyu.edu.hk)
2021-05-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume209Pages:13
AbstractThe 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.
Keywordmaraging steel precipitation microstructure evolution mechanical property
Funding OrganizationNational 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
DOI10.1016/j.actamat.2021.116788
Indexed BySCI
Language英语
Funding ProjectNational 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 AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000641587700010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161702
Collection中国科学院金属研究所
Corresponding AuthorWang, W.; Jiao, Z. B.
Affiliation1.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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