Substructure Development and Deformation Twinning Stimulation through Regulating the Processing Path during Multi‐Axial Forging of Twinning Induced Plasticity Steel

Abstract

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 ( P ɛ ¼ 0.8), however, an unexpected increase is realized at the end of first MAF pass ( P ɛ ¼ 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.

Effects of constrained groove pressing on mechanical properties of a TWIP steel

“…They found that the formation of nanograins, nanotwins, and segregation of solute to grain boundaries during HPT are responsible for enhanced strengthening. Akbarian et al [23] used multi-axial forging (MAF) at room temperature to process Fe-29.1Mn-0.039C-2.4Al-0.3Si TWIP steel, and investigated the mechanical properties and microstructural changes. Etemad et al [24] used accumulative roll bonding (ARB) to produce nano/ultrafine grain Fe-31Mn-3Al-3Si TWIP steel sheets at room temperature.…”

The Correlation of Macrostructure, Microstructure, and Texture with Room Temperature Mechanical Properties of a Twinning‐Induced Plasticity Automotive Steel after Friction Stir Spot Welding/Processing

“…Deformation twinning strongly depends on grain size and orientations, and more attention should be paid to microstructure and texture evolution caused by the severe deformation and plastic dissipation during FSSW/P of TWIP steel. Bimodal grain structures obtained during FSSW/P exhibit superior combination of strength and ductility through high work hardening capacity of coarse grains along with the strengthening ability of fine grains.…”