DC FieldValueLanguage
dc.contributorDepartment of Mechanical Engineeringen_US
dc.contributorChinese Mainland Affairs Officeen_US
dc.creatorNiu, MCen_US
dc.creatorYin, LCen_US
dc.creatorYang, Ken_US
dc.creatorLuan, JHen_US
dc.creatorWang, Wen_US
dc.creatorJiao, ZBen_US
dc.date.accessioned2021-06-16T06:36:06Z-
dc.date.available2021-06-16T06:36:06Z-
dc.identifier.issn1359-6454en_US
dc.identifier.urihttp://hdl.handle.net/10397/90340-
dc.language.isoenen_US
dc.publisherPergamon Pressen_US
dc.subjectMaraging steelen_US
dc.subjectMechanical propertyen_US
dc.subjectMicrostructure evolutionen_US
dc.subjectPrecipitationen_US
dc.titleSynergistic alloying effects on nanoscale precipitation and mechanical properties of ultrahigh-strength steels strengthened by Ni3Ti, Mo-enriched, and Cr-rich co-precipitatesen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume209en_US
dc.identifier.doi10.1016/j.actamat.2021.116788en_US
dcterms.abstractThe synergistic effects of Mo, Ti, and Cr on nanoscale precipitation and mechanical properties of maraging stainless steels were systematically studied using high-resolution scanning transmission electron microscopy, atom probe tomography (APT), thermodynamic and first-principles calculations, and mechanical 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 partitioning not only increases the chemical driving force, but also reduces the strain energy for nucleation, thereby accelerating Ni3Ti 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 heterogeneous 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.en_US
dcterms.accessRightsembargoed accessen_US
dcterms.bibliographicCitationActa materialia, 1 May 2021, v. 209, 116788en_US
dcterms.isPartOfActa materialiaen_US
dcterms.issued2021-05-01-
dc.identifier.scopus2-s2.0-85102252548-
dc.identifier.artn116788en_US
dc.description.validate202106 bcwhen_US
dc.description.oaNot applicableen_US
dc.identifier.FolderNumbera0935-n03-
dc.identifier.SubFormID2174-
dc.description.fundingSourceOthersen_US
dc.description.fundingTextP0013862, P0020370en_US
dc.description.pubStatusPublisheden_US
dc.date.embargo2023.05.01en_US
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