Modelling the effect of strain rate on the thermomechanical behaviour of AISI 304 stainless steel

Abstract

The present work deals with the interdependences between the strain rate and the strain hardening on stainless austenitic steels. Uniaxial tension tests were conducted on a 304 stainless steel at different strain rates in order to analyse the influence of this parameter on the strain hardening and on the material formability. For the strain rates levels analysed (10 -4 to 10 -1 s -1 ) it was also observed that increasing the strain rate from 10 -4 up to 10 -1 s -1 leads to a 25 % difference in uniform tension elongation revealing the curve-crossing phenomenon. Namely, strain rates equal or higher than 10 -2 lead to a stagnation of strain hardening after a tensile strain of about 0.2. In order to investigate the results obtained, microstructural and thermal analyses were conducted and numerical simulations were performed. It was observed that the decreasing of formability of the material is essentially due to thermal aspects. In the discussion, the experimental and numerical results are analysed in terms of thermal softening, phase transformation and strain rate sensibility.

Prediction of stored energy in polycrystalline materials during cyclic loading

“…The choices of m = 26 and _ c 0 ¼ 1 Â 10 À3 are made to be in line the experimental data reported by Andrade-Campos et al (2005) and Chen et al (2004). The influence of the temperature on the slip resistance is determined by the parameters p 1 and p 2 in (15).…”

Effect of Strain Rate, Adiabatic Heating and Phase Transformation Phenomena on the Mechanical Behaviour of Stainless Steel

“…It appears when changes in strain hardening occur for one of the two curves (or for both curves). This phenomenon was already pointed out by the authors [23], but it was not well experimentally documented.…”

“…Numerous models have been developed for stainless steels (see, e.g. Refs [22–31]). Not all of these approaches include the martensitic phase transformation.…”