In this study, the rate of dislocation accumulation in the tensile strained twinning induced plasticity steel was calculated via the X-ray diffraction measurements and compared with other face-centered cubic metals and alloys. The results indicated that the X-ray diffraction technique was an alternative method to estimate the dislocation density. Moreover, flow stress analysis of Fe–31Mn–3Al–3Si twinning-induced plasticity steel with the grain size of about 18 μm indicated that, beside a direct effect of the dislocation interactions on the flow stress, another strengthening mechanism was also required to describe the flow behavior. For this reason, the strengthening contribution due to the formation of mechanical twins was considered as a reduction of dislocation mean free path. Interestingly, the estimated flow stress equation consisting of the strengthening effects of both dislocation interactions and dynamic microstructure refinement due to mechanical twinning (i.e., the dynamic Hall–Petch effect) were in good agreement with the experimental data and equation proposed by Ludwigson for low stacking fault energy materials.

Flow Stress Analysis of TWIP Steel via the XRD Measurement of Dislocation Density. G.Dini, R.Ueji, A.Najafizadeh, S.M.Monir-Vaghefi: Materials Science and Engineering A, 2010, 527[10-11], 2759-63