TRIP and phase evolution for the pearlitic transformation of the steel 100Cr6 under. step-wise loads

Abstract

The investigation of complex material behaviour of steel like transformation-induced plasticity (TRIP) and stress-dependent phase transformation (SDPT) is a large field of current research. The simulation of the material behaviour of work-pieces in complex situations requires a knowledge as deep as possible about such phenomena. In addition, there are effects in the case of non-constant stress which cannot be explained by the widely used Leblond model for TRIP. Therefore, we consider a TRIP model taking into account back stress due to TRIP itself. Based on experimental data for the isothermal pearlitic transformation of the steel 100Cr6 (SAE52100) under step-wise loads we calculate material parameters for the extended TRIP model. Regardless of the preliminary character of the performed tests, all experiments show a back-stress effect with a decrease of the TRIP strain after unloading.Keywords: steel, TRIP, back stress, stress-dependent phase transformation, step-wise load

Comparison of different approaches to transformation‐induced plasticity in steel

“…2), the model II allows this decrease, generating a backstress [9,27,28]. l Both models do not allow different values of j for tension, compression and torsion [29,25,26].…”

“…A full load up to the end gives nearly the same results for the model (26) with and without backstress ( Figure 2). We note that these two model versions require different j values ( [28] for discussion and further references). It remains for future work, to perform simulations for the Leblond model II, comparing with our approach presented in 3.1.…”

Simulation of anisotropic dilation behaviour of layered and banded steel samples during phase changes

“…is a material parameter which can be determined by simple experiments [7]; see [8,9] for data. The model is kept simple here, see [10,11] for more complex models, including back stress, discussion and literature. 874 A. Schmidt et al…”