Abstract
An austenitic stainless steel has been subjected to large amplitude strain paths containing a strain reversal.
During the tests, apart from the stress and the strain also magnetic induction was measured to monitor the transformation of austenite to martensite.
From the in-situ magnetic induction measurements an estimate of the stress partitioning among the phases is determined.
When the strain path reversal is applied at low strains, a classical Bauschinger effect is observed. When the strain reversal is applied at higher strains, a higher flow stress is measured after the reversal compared to the flow stress before reversal. Also a stagnation of the transformation is observed, meaning that a higher strain as well as a higher stress than before the strain path change is required to restart the transformation after reversal.
The observed behavior can be explained by a model in which for the martensitic transformation a stress induced transformation model is used.
The constitutive behavior of both the austenite phase and the martensite is described by a Chaboche model to account for the Bauschinger effect.
In the model mean-field homogenization of the material behavior of the individual phases is employed to obtain a constitutive behavior of the two-phase composite.
The overall applied stress, the stress in the martensite phase and the observed transformation behavior during cyclic shear are very well reproduced by the model simulations.
| Original language | English |
|---|---|
| Pages (from-to) | 9-18 |
| Number of pages | 10 |
| Journal | Computer methods in materials science |
| Volume | 15 |
| Issue number | 1 |
| Publication status | Published - 2015 |
Keywords
- METIS-309144
- IR-94154