Thermal stability and strain rate sensitivity of ultra ne-grained (UFG) Fe produced by severe plastic deformation (SPD) were investigated. The UFG Fe was processed by equal-channel angular pressing (ECAP) via route Bc. After 6 passes, the grain size of UFG Fe reaches 600 nm, as con rmed by means of electron back scatter di raction (EBSD). Examination of micro-hardness and grain size of UFG Fe as a function of post-ECAP annealing temperature shows a transition from recovery to recrystallization. The critical transition temperature is approximately 500 C, and the material has a bimodal structure after annealing at this temperature. Deformation behaviors of ECAP Fe and ECAP + annealing Fe were studied under both quasi-static and dynamic compressive loadings. The UFG iron shows increased strength and reduced strain rate sensitivity compared with its coarse-grained counterparts. The appropriate post-ECAP annealing can increase strain hardening ability and cancel out thermal softening e ect with only a small loss of strength under dynamic loading.
Yuan FP,Wu XL. Annealing and strain rate effects on the mechanical behavior of ultrafine-grained iron produced by SPD[J]. THEORETICAL & APPLIED MECHANICS LETTERS,2011,1,2,:021002.
APA
袁福平,&武晓雷.(2011).Annealing and strain rate effects on the mechanical behavior of ultrafine-grained iron produced by SPD.THEORETICAL & APPLIED MECHANICS LETTERS,1(2),021002.
MLA
袁福平,et al."Annealing and strain rate effects on the mechanical behavior of ultrafine-grained iron produced by SPD".THEORETICAL & APPLIED MECHANICS LETTERS 1.2(2011):021002.
; Wu XL(武晓雷)
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