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Effect of Grain Size and Grain Orientation on Dislocations Structure in Tensile Strained TWIP Steel During Initial Stages of Deformation
Author(s) -
Dini Ghasem,
Ueji Rintaro
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100308
Subject(s) - twip , materials science , substructure , crystal twinning , grain size , dislocation , deformation (meteorology) , grain boundary strengthening , ultimate tensile strength , crystallography , orientation (vector space) , metallurgy , composite material , condensed matter physics , microstructure , grain boundary , geometry , structural engineering , mathematics , engineering , physics , chemistry
Abstract The effects of grain size and grain orientation on substructure in Fe–31Mn–3Al–3Si TWIP steel at a true strain of 0.06 were investigated. The results of the TEM observations indicated that where the grain size was 18.4 µm, the dislocations structure showed orientation dependence so that the mixture of both planar and tangled dislocations structure can be found in the deformed structure before the mechanical twinning initiation. Regardless of the grain orientation, however, the dislocation entanglements were mainly observed in the case of 2.1 µm grain size. Additionally, the reason for the suppression of the mechanical twinning as a result of the grain refinement at higher strains was described by the change of dislocations structure during initial stages of deformation.