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Substructure Development and Deformation Twinning Stimulation through Regulating the Processing Path during Multi‐Axial Forging of Twinning Induced Plasticity Steel
Author(s) -
Akbarian Shima,
ZareiHanzaki Abbas,
Abedi Hamid Reza,
Unnikrishnan Rahul,
Moat Richard
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800453
Subject(s) - twip , crystal twinning , materials science , substructure , work hardening , plasticity , deformation (meteorology) , forging , metallurgy , composite material , formability , slip (aerodynamics) , deformation mechanism , dynamic recrystallization , strain hardening exponent , recrystallization (geology) , microstructure , hot working , structural engineering , thermodynamics , physics , engineering , paleontology , biology
Multi‐axial forging (MAF) at room temperature is employed to investigate the effects of deformation processing path and the amount of imposed strain on the deformation mechanisms of a twinning‐induced plasticity (TWIP) steel. The results indicate that the twin frequency is decreased by applying the 2nd compression (∑ ɛ = 0.8), however, an unexpected increase is realized at the end of first MAF pass (∑ ɛ = 1.2). This is attributed to the change in strain path and orientation dependence of deformation twinning. The latter is phenomenal considering the previous researches reporting the suppression of twinning at the early stage of deformation ( ɛ < 0.4). The same sequence is followed during the second pass of MAF process. Interestingly, the progressive and continues substructure development along with dynamic Hall–Petch effect results from deformation twinning leads to an appreciable grain refinement. The latter is accompanied by the sharp drop of hardening rate in corresponding flow curves. The microtexture analysis indicates the strengthened texture of the 1 pass‐processed specimens which is weaken at the end of 2 pass due to the recrystallization and increasing the number of texture component. The current work also explores the room temperature mechanical properties of the multi axial forged workpiece through elaborating the miniaturized tensile testing method.