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Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility
Wu XL(武晓雷); Yang MX(杨沐鑫); Yuan FP(袁福平); Chen L; Zhu YT; Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationACTA MATERIALIA
2016
Volume112
ISSN1359-6454
AbstractWe report a design strategy to combine the benefits from both gradient structure and transformation induced plasticity (TRIP). The resultant TRIP-gradient steel takes advantage of both mechanisms, allowing strain hardening to last to a larger plastic strain. 304 stainless steel sheets were treated by surface mechanical attrition to synthesize gradient structure with a central coarse-grained layer sandwiched between two grain-size gradient layers. The gradient layer is composed of submicron-sized parallelepiped austenite domains separated by intersecting epsilon-martensite plates, with increasing domain size along the depth. Significant microhardness heterogeneity exists not only macroscopically between the soft coarse-grained core and the hard gradient layers, but also microscopically between the austenite domain and epsilon-martensite walls. During tensile testing, the gradient structure causes strain partitioning, which evolves with applied strain, and lasts to large strains. The gamma -> alpha' martensitic transformation is triggered successively with an increase of the applied strain and flow stress. Importantly, the gradient structure prolongs the TRIP effect to large plastic strains. As a result, the gradient structure in the 304 stainless steel provides a new route towards a good combination of high strength and ductility, via the co-operation of both the dynamic strain partitioning and TRIP effect. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
DOI10.1016/j.actamat.2016.04.045
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000377326400032
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationThis work was financially supported by the National Natural Science Foundation of China (NSFC) under grant Nos. 11572328, 11222224, 11472286, the 973 Programs under grant Nos. 2012CB932203, 2012CB937500, and 6138504. Y.Z. was supported by the US Army Research Office (W911 NF-12-1-0009), the US National Science Foundation (DMT-1104667), and the Nanjing University of Science and Technology.
DepartmentLNM材料介观力学性能的表征
Classification一类
RankingTrue
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59508
Collection非线性力学国家重点实验室
Corresponding AuthorWu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Wu XL,Yang MX,Yuan FP,et al. Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility[J]. ACTA MATERIALIA,2016,112.
APA 武晓雷,杨沐鑫,袁福平,Chen L,Zhu YT,&Wu, XL .(2016).Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility.ACTA MATERIALIA,112.
MLA 武晓雷,et al."Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility".ACTA MATERIALIA 112(2016).
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