| 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.
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| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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| 2012-08-15 | |
| Volume | 551Pages:154-159 |
| ISSN | 0921-5093 |
| Abstract | The 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. |
| Keyword | Nanostructure 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 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000306824700024 |
| Funding Organization | The financial supports by 973 Program of China (Nos. 2012CB932203, 2012CB937500 and 2010CB631004) and NSFC (Grants Nos. 11002151, 10721202 and 11072243) are gratefully acknowledged. |
| Department | LNM材料介观力学性能的表征 |
| Classification | 一类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/46711 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Wu, 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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