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Emergent failure transition of pearlitic steel at extremely high strain rates

文献类型：期刊论文

作者Liang, Lun-Wei2,3,4; Dai, Shi-Cheng2,4; Chen, Yan2,4; Wang, Hai-Ying2,4; Wang, Yun-Jiang2,4; Dai, Lan-Hong1,2,4; Dai LH(戴兰宏); Wang HY(汪海英); Chen Y(陈艳); Wang YJ(王云江)
刊名COMPUTATIONAL MATERIALS SCIENCE
出版日期2023-02-25
卷号219页码:13
关键词Pearlitic steels Fracture Crack Dislocation nucleation Molecular dynamics
ISSN号0927-0256
DOI10.1016/j.commatsci.2022.112005
通讯作者Wang, Yun-Jiang(yjwang@imech.ac.cn) ; Dai, Lan-Hong(lhdai@lnm.imech.ac.cn)
英文摘要It is a common wisdom that metallic materials become brittle once being deformed quickly. However, here we reveal an abnormal strain-rate-induced brittle-ductile-delamination transition in a widely used pearlitic steel with unique structure of alternative arrangement of nanoscale ductile ferrite and brittle cementite through extensive molecular dynamics simulations. In contrast to the brittle cleavage fracture in conventional crystalline alloys, the brittle fracture in pearlitic steel at relatively low strain rate is mediated by the nanoscale cavitation ahead of crack tip, akin to the widely observed fracture mode in metallic glasses. As the strain rate increases, fracture mode transforms to a dislocation nucleation mediated ductile mechanism. At extremely high strain rate, it is found that the fracture mode turns to be collective delamination at the interfaces, leading to a surprising "delamination toughening". The abnormal brittle-to-ductile transition with increasing deformation rate is physically rationalized by a mechanistic model, which is based on a scenario of energetic competition between the interface cleavage and the dislocation nucleation in the vicinity of crack tip. Once the strain rate exceeds a critical value, fracture transitions to dislocation nucleation dominated. When strain rate increases to extremely high values, there is no enough time for either crack propagation or dislocation nucleation, and the collective delamination of interfaces occurs which involves only instantaneous bond breaking at weakly bonded regions, i. e. the interface. The unravelled phenomenon challenges the conventional knowledge of materials deformation and failure which might shed light on coordinating unanticipated utilities of the ultrastrong pearlitic steels in extreme environments.
WOS关键词FERRITE-CEMENTITE INTERFACE ; MOLECULAR-DYNAMICS ; DEFORMATION MECHANISMS ; FRACTURE-BEHAVIOR ; STRENGTHENING MECHANISMS ; DISLOCATION NUCLEATION ; METALLIC GLASSES ; CRACK-TIP ; BCC IRON ; SIMULATIONS
资助项目NSFC[11988102] ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences ; Science Challenge Project ; Youth Innovation Promotion Association of of the Chinese Academy of Sciences ; opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology) ; [11790292] ; [11972346] ; [12072344] ; [XDB22040302] ; [XDB22040303] ; [QYZDJSSW-JSC011] ; [TZ2016001] ; [2017025] ; [KFJJ18-14M]
WOS研究方向Materials Science
语种英语
WOS记录号WOS:000925244700001
资助机构NSFC ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences ; Science Challenge Project ; Youth Innovation Promotion Association of of the Chinese Academy of Sciences ; opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology)
源URL[http://dspace.imech.ac.cn/handle/311007/91697]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Wang, Yun-Jiang; Dai, Lan-Hong; Dai LH(戴兰宏); Wang YJ(王云江)
作者单位1.Univ Chinese Acad Sci, Sch Future Technol, Beijing 101408, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
3.Sany Automobile Mfg Co Ltd, Changsha 410100, Peoples R China
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Liang, Lun-Wei,Dai, Shi-Cheng,Chen, Yan,et al. Emergent failure transition of pearlitic steel at extremely high strain rates[J]. COMPUTATIONAL MATERIALS SCIENCE,2023,219:13.
APA Liang, Lun-Wei.,Dai, Shi-Cheng.,Chen, Yan.,Wang, Hai-Ying.,Wang, Yun-Jiang.,...&Wang YJ.(2023).Emergent failure transition of pearlitic steel at extremely high strain rates.COMPUTATIONAL MATERIALS SCIENCE,219,13.
MLA Liang, Lun-Wei,et al."Emergent failure transition of pearlitic steel at extremely high strain rates".COMPUTATIONAL MATERIALS SCIENCE 219(2023):13.

入库方式： OAI收割

来源：力学研究所

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