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Strain hardening behaviors and strain rate sensitivity of gradient-grained Fe under compression over a wide range of strain rates
Yuan FP(袁福平); Chen P; Feng YP; Jiang P(姜萍); Wu XL(武晓雷); Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
Source PublicationMECHANICS OF MATERIALS
2016
Volume95Pages:71-82
ISSN0167-6636
AbstractIn the present work, gradient-grained Fe was synthesized by means of surface mechanical grinding treatment, and then the compression behaviors of the coarse-grained Fe and the gradient-grained Fe were investigated under both quasi-static and dynamic loading conditions over a wide range of strain rates (from 5 x 10(-4) to 10(4) s(-1)). After surface mechanical grinding treatment, equiaxed ultrafine grains, elongated lamellar ultrafine grains, full-developed sub-grains with dense dislocations walls, non-fully-developed dislocation cells, and deformed coarse grains are sequentially observed along the depth from the treated surface. The grain/cell size increases while the measured micro-hardness decreases along the depth for the gradient-grained Fe. The gradient-grained structure shows apparent strain hardening behaviors at all strain rates up to 10(4) s(-1) although the strain hardening exponent (n) for the gradient-grained Fe is smaller than that of the coarse-grained Fe at the same strain rate. This apparent hardening behavior is attributed to the hardening from both the coarse-grained center and the surface gradient layers when the strain localization trend for the ultrafine-grained surface layers is suppressed by the coarse-grained center. The extra hardening might be due to the back stress hardening associated with the constraint and mechanical incompatibility between different layers in the gradient-grained structure. The dynamic strain rate sensitivity of the gradient-grained Fe is observed to be slightly larger than that of the coarse-grained Fe, which is controversial to the general observation that strain rate sensitivity should decrease with reduction of grain size for BCC metals. The geometrically necessary dislocations associated with the back stress hardening and the grain size gradient result in additional increase in dislocation density, which may be the reason for the enhanced dynamic strain rate sensitivity in the gradient-grained Fe even it has smaller average grain size compared to the coarse-grained Fe. The present results should provide insights for the applications of gradient-grained structure under dynamic conditions. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordDynamic Loading Strain Hardening Behaviors Strain Rate Sensitivity Gradient-grained Structure Coarse-grained Structure
DOI10.1016/j.mechmat.2016.01.002
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000372558000006
WOS KeywordDynamic loading ; Strain hardening behaviors ; Strain rate sensitivity ; Gradient-grained structure ; Coarse-grained structure
WOS Research AreaMaterials Science ; Mechanics
WOS SubjectMaterials Science, Multidisciplinary ; Mechanics
Funding OrganizationThe authors would like to acknowledge the financial support from the National Key Basic Research Program of China under grants no. 2012CB932203 and no. 2012CB937500 ; and NSFC under grants no. 11222224, no. 11472286, 11072243, 11572328, and no. 11021262. The authors would like to thank Dr. Husheng Zhang for helping to conduct the dynamic compression experiments.
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/311007/59557
Collection非线性力学国家重点实验室
Corresponding AuthorYuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Yuan FP,Chen P,Feng YP,et al. Strain hardening behaviors and strain rate sensitivity of gradient-grained Fe under compression over a wide range of strain rates[J]. MECHANICS OF MATERIALS,2016,95:71-82.
APA 袁福平,Chen P,Feng YP,姜萍,武晓雷,&Yuan, FP .(2016).Strain hardening behaviors and strain rate sensitivity of gradient-grained Fe under compression over a wide range of strain rates.MECHANICS OF MATERIALS,95,71-82.
MLA 袁福平,et al."Strain hardening behaviors and strain rate sensitivity of gradient-grained Fe under compression over a wide range of strain rates".MECHANICS OF MATERIALS 95(2016):71-82.
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