Dislocation Strengthening without Ductility Trade-off in Metastable Austenitic Steels | |
Liu JB; Jin YB; Fang XY; Chen CX; Feng Q; Liu XW; Chen YZ; Suo T; Zhao F; Huang TL; Wang HT; Wang X; Fang YT; Wei YJ(魏宇杰); Meng L; Lu J; Yang W; Wang, HT (reprint author), Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Zhejiang, Peoples R China.; Lu, J (reprint author), City Univ Hong Kong, Dept Mech & Biomed Engn, Hong Kong, Hong Kong, Peoples R China. | |
发表期刊 | SCIENTIFIC REPORTS |
2016 | |
卷号 | 6页码:35345 |
ISSN | 2045-2322 |
摘要 | Strength and ductility are mutually exclusive if they are manifested as consequence of the coupling between strengthening and toughening mechanisms. One notable example is dislocation strengthening in metals, which invariably leads to reduced ductility. However, this trend is averted in metastable austenitic steels. A one-step thermal mechanical treatment (TMT), i.e. hot rolling, can effectively enhance the yielding strength of the metastable austenitic steel from 322 +/- 18 MPa to 675 +/- 15 MPa, while retaining both the formability and hardenability. It is noted that no boundaries are introduced in the optimized TMT process and all strengthening effect originates from dislocations with inherited thermal stability. The success of this method relies on the decoupled strengthening and toughening mechanisms in metastable austenitic steels, in which yield strength is controlled by initial dislocation density while ductility is retained by the capability to nucleate new dislocations to carry plastic deformation. Especially, the simplicity in processing enables scaling and industrial applications to meet the challenging requirements of emissions reduction. On the other hand, the complexity in the underlying mechanism of dislocation strengthening in this case may shed light on a different route of material strengthening by stimulating dislocation activities, rather than impeding motion of dislocations. |
DOI | 10.1038/srep35345 |
URL | 查看原文 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000385314400001 |
WOS研究方向 | Science & Technology - Other Topics |
WOS类目 | Multidisciplinary Sciences |
项目资助者 | H. Wang acknowledges the financial support from National Natural Science Foundation of China (Nos 11322219 and 11321202), the Fundamental Research Funds for the Central Universities of China (2014XZZX003-19). J. Liu acknowledges the support from the financial support from National Natural Science Foundation of China (Nos 11202183 and 11572281), the National High Technology Research and Development Program (863) of China under Grant No. 2011AA11A101, the State Key Laboratory for Strength and Vibration of Mechanical Structures Program of Xi'an Jiaotong University (SV2014-KF-13). |
论文分区 | 一类 |
力学所作者排名 | 5+ |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/59768 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Wang, HT (reprint author), Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Zhejiang, Peoples R China.; Lu, J (reprint author), City Univ Hong Kong, Dept Mech & Biomed Engn, Hong Kong, Hong Kong, Peoples R China. |
推荐引用方式 GB/T 7714 | Liu JB,Jin YB,Fang XY,et al. Dislocation Strengthening without Ductility Trade-off in Metastable Austenitic Steels[J]. SCIENTIFIC REPORTS,2016,6:35345. |
APA | Liu JB.,Jin YB.,Fang XY.,Chen CX.,Feng Q.,...&Lu, J .(2016).Dislocation Strengthening without Ductility Trade-off in Metastable Austenitic Steels.SCIENTIFIC REPORTS,6,35345. |
MLA | Liu JB,et al."Dislocation Strengthening without Ductility Trade-off in Metastable Austenitic Steels".SCIENTIFIC REPORTS 6(2016):35345. |
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