IMECH-IR  > 非线性力学国家重点实验室
Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite
Chen L(陈柳); Yuan FP(袁福平); Jiang P(姜萍); Xie JJ(谢季佳); Wu XL(武晓雷); Wu XL(武晓雷)
Source PublicationMaterials Science and Engineering A-Structural Materials Properties Microstructure and Processing
2014
Volume618Pages:563-571
ISSN0921-5093
AbstractA micro-duplex structure consisting of austenite and ferrite was produced by equal channel angular pressing and subsequent intercritical annealing. As compared to coarse-grained (CG) counterpart, the strength and ductility of micro-duplex samples are enhanced simultaneously due to smaller grain sizes in both phases and more uniformly distributed austenite in ferrite matrix. The average yield stress and uniform elongation are increased to 540 MPa and 0.3 as compared to 403MPa and 0.26 of its CG counterpart respectively. The Hall–Petch coefficients of austenite and ferrite grain boundaries were quantitatively measured as 224.9 and 428.9 MPa μm1/2 respectively. In addition, a Hall–Petch type coefficient was used to describe the ability of phase boundary to obstruct dislocation motion, which was measured as 309.7 MPa μm1/2. Furthermore, the surface-to-volume ratio of phase boundary in micro-duplex structure was estimated to be 1.17×106 m−1, which is increased by an order of magnitude as compared to 1.2×105 m−1 of its CG counterpart. Based on the strain gradient theory, a model was proposed to describe the effect of surface-to-volume ratio of phase boundary on strain hardening rate, which shows a good agreement with the experimental results.
KeywordDuplex Stainless Steel Equal Channel Angular Pressing Strain Hardening Modeling Phase Boundary
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000344439500069
Funding OrganizationThe authors would like to thank the financial supports by 973 Program of China (Nos. 2012CB932203 and 2012CB937500) and NSFC (Grants nos. 51301187, 11222224, 11021262 and 11072243).
DepartmentLNM材料介观力学性能的表征
Classification一类
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49115
Collection非线性力学国家重点实验室
Corresponding AuthorWu XL(武晓雷)
Recommended Citation
GB/T 7714
Chen L,Yuan FP,Jiang P,et al. Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite[J]. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,2014,618:563-571.
APA Chen L,Yuan FP,Jiang P,Xie JJ,Wu XL,&武晓雷.(2014).Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite.Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,618,563-571.
MLA Chen L,et al."Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite".Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 618(2014):563-571.
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