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Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure
Sun, Y. T.1,2; Kong, X.1,2; Wang, Z. B.1
Corresponding AuthorWang, Z. B.(zbwang@imr.ac.cn)
2022-08-01
Source PublicationINTERNATIONAL JOURNAL OF PLASTICITY
ISSN0749-6419
Volume155Pages:18
AbstractSpatially gradient microstructures have shown a promising application in enhancing strengthductility synergy of engineering metals such as austenitic stainless steels. However, existing approaches are limiting in producing a thick gradient nanostructured (GNS) layer with a high strengthening capability, and the underlying deformation mechanisms are still not clear in GNS austenitic stainless steels. In this work, we developed a new approach, i.e., plate surface mechanical rolling treatment, to produce a bulk gradient nanostructure in a 304 stainless steel plate of -1.90 mm in thickness. Uniaxial tensile tests revealed that an ultra-high yield strength of -1073 MPa with a considerable uniform elongation of -21% was achieved in the GNS sample. Subsequently, the evolutions of microstructure, phase, microhardness, and local strain distribution were systematically studied in the GNS plate during tensile tests. The results demonstrated that the mechanical incompatibilities, relating with the gradient microstructure and martensiteenclosing-austenite domains, contribute to an extra strain-hardening capability, leading to the outstanding strength-ductility synergy in the GNS 304 stainless steel. Furthermore, analyses based on experimental observations and theoretical calculations revealed that dislocation activities, instead of deformation-induced martensite transformation, microstructure refinement, and twinning, play a dominant role in the strain-hardening mechanisms of the GNS plate during tension.
KeywordGradient nanostructured Austenitic stainless steel Strength-ductility synergy Strain hardening capability Strain incompatibility
Funding OrganizationNational Key Research and Development Program of China ; CAS-HK Joint Laboratory of Nanomaterials and Mechanics, and Shenyang National Laboratory for Materials Science
DOI10.1016/j.ijplas.2022.103336
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFA0204401] ; National Key Research and Development Program of China[2017YFA0204403] ; CAS-HK Joint Laboratory of Nanomaterials and Mechanics, and Shenyang National Laboratory for Materials Science
WOS Research AreaEngineering ; Materials Science ; Mechanics
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS IDWOS:000804553800001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174162
Collection中国科学院金属研究所
Corresponding AuthorWang, Z. B.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Sun, Y. T.,Kong, X.,Wang, Z. B.. Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,155:18.
APA Sun, Y. T.,Kong, X.,&Wang, Z. B..(2022).Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure.INTERNATIONAL JOURNAL OF PLASTICITY,155,18.
MLA Sun, Y. T.,et al."Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure".INTERNATIONAL JOURNAL OF PLASTICITY 155(2022):18.
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