|Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron|
|Yuan FP(袁福平); Jiang P(姜萍); Wu XL(武晓雷); Yuan, FP; Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
|Source Publication||INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
|Abstract||In the present study, evolution of adiabatic shear band (ASB) and annealing effect on the evolution of ASB in ultra-fine-grained (UFG) Fe under dynamic shear loading were investigated. The UFG Fe was processed by equal-channel angular pressing (ECAP) via route B-C. After 6 passes, the grain size of UFG Fe reaches similar to 500 nm, as confirmed by means of Transmission Electron Microscopy (TEM). Examination of microhardness and grain size of UFG Fe shows a transition from recovery to grain growth at annealing temperature of approximately 400 degrees C. The high-strain-rate response of UFG Fe was characterized by hat-shaped specimen set-up in Hopkinson bar experiments. With increased shear deformation, the evolution of ASB was found to be a two-stage process, namely a nucleation stage followed by a thickening stage. In the thickening stage, ASB evolution is accompanied by increasing in both thickness and micro-hardness of ASB. The increased micro-hardness in ASB and TEM observations inside ASB indicate that grains in the shear band are further refined. Once the shear band is initiated, cracks also nucleate and propagate within ASB, which produces failure in the material. After 450 degrees C post-ECAP annealing, development of ASB and crack propagation were inhibited under dynamic shear loading. The results indicated that the ductility under dynamic shear loading can be significantly improved by appropriate post-ECAP annealing without losing the strength of the UFG Fe.|
|Keyword||Adiabatic Shear Band
Equal-channel Angular Pressing
Dynamic Shear Loading
|Funding Organization||The authors would like to acknowledge the financial support from 973 Project of China (2012CB932203, 2012CB937500 and 6138504621) and NSF of China (11002151 and 11072243).
|Corresponding Author||Yuan, FP; Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.|
Yuan FP,Jiang P,Wu XL,et al. Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron[J]. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,2012,50:1-8.
袁福平,姜萍,武晓雷,Yuan, FP,&Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China..(2012).Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron.INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,50,1-8.
袁福平,et al."Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron".INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 50(2012):1-8.
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