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Mechanical properties and nanostructures in a duplex stainless steel subjected to equal channel angular pressing
Chen L(陈柳); Yuan FP(袁福平); Jiang P(姜萍); Wu XL(武晓雷); Wu, XL; Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2012-08-15
Volume551Pages:154-159
ISSN0921-5093
AbstractThe nanostructure and resultant mechanical property were studied in an UNS S32304 duplex stainless steel subjected to equal channel angular pressing. The successive refinement of original grains was observed to happen in dual phases, i.e., austenite and ferrite, during 4-pass pressing. Both phases exhibit similar lamellar features of microstructures by the formation of dislocation boundaries and their mis-orientation evolution with increasing strains. The deformation twinning and martensitic transformation as well were observed to happen in austenite. The transversal spacing of elongated grains is 79 nm in austenite and 130 nm in ferrite, respectively. After annealing at 973 K for 20 min, the elongated grains tend to become equiaxed, and the average size of nanograins increases to 108 nm in austenite and 235 nm in ferrite, respectively. The tensile tests show that the yield strength of the dual-phase nanostructure is 1460 MPa after 4-pass pressing, as compared to 403 MPa of its coarse-grained counterpart, but with uniform elongation of merely 2%. After annealing at 973 K, the uniform elongation increases to 7% with the yield strength of 1100 MPa. In addition, different stages of strain hardening were observed in various microstructures during tensile testing, and the corresponding plastic responses were discussed.
KeywordNanostructure Equal Channel Angular Pressing Mechanical Property Duplex Stainless Steel Dual-phase Steels Severe Plastic-deformation Nanocrystalline Materials Tensile Properties Attrition Treatment Grain-refinement Surface-layer Microstructure Evolution Ductility
Subject Area损伤、破坏机理和微结构演化
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000306824700024
Funding OrganizationThe financial supports by 973 Program of China (Nos. 2012CB932203, 2012CB937500 and 2010CB631004) and NSFC (Grants Nos. 11002151, 10721202 and 11072243) are gratefully acknowledged.
DepartmentLNM材料介观力学性能的表征
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/46711
Collection非线性力学国家重点实验室
Corresponding AuthorWu, XL; Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Chen L,Yuan FP,Jiang P,et al. Mechanical properties and nanostructures in a duplex stainless steel subjected to equal channel angular pressing[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2012,551:154-159.
APA 陈柳,袁福平,姜萍,武晓雷,Wu, XL,&Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China..(2012).Mechanical properties and nanostructures in a duplex stainless steel subjected to equal channel angular pressing.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,551,154-159.
MLA 陈柳,et al."Mechanical properties and nanostructures in a duplex stainless steel subjected to equal channel angular pressing".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 551(2012):154-159.
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