TRIP steel typically contains four different phases, ferrite, bainite, austenite and martensite. During deformation the metastable retained austenite tends to transform to stable martensite. The accompanying transformation strain has a beneficial effect on the ductility of the steel during forming. By changing the alloy composition, the rolling procedure and the thermal processing of the steel, a wide range of different morphologies and microstructures can be obtained. Interesting parameters are the amount of retained austenite, the carbon content of the austenite, the stability of the austenite as well as its hardness. A constitutive model is developed for TRIP steel which contains four different phases. The transformation of the metastable austenite to martensite is taken into account. The phase transformation depends on the stress in the austenite. Due to the differences in hardness of the phases the austenite stress is not equal to the overall stress. An estimate of the local stress in the austenite is obtained by homogenization of the response of the phases using a self-consistent mean-field homogenization method. Overall stress-strain results as well as stress-strain results for individual phases are compared to measurements found in literature for some TRIP steels. The model is then used to explore the influence of some possible variations in microstructural composition on the mechanical response of the steel.
|Title of host publication||International Conference on the Technology of Plasticity, ICTP 2011|
|Editors||A.E. Tekkaya, G. Hirt|
|Place of Publication||Aachen|
|Number of pages||6|
|Publication status||Published - 25 Sep 2011|
|Event||10th International Conference on Technology of Plasticity, ICTP 2011 - Aachen, Germany|
Duration: 25 Sep 2011 → 30 Sep 2011
Conference number: 10
|Conference||10th International Conference on Technology of Plasticity, ICTP 2011|
|Period||25/09/11 → 30/09/11|
- Mean field homogenization
- Martensitic transformation
Perdahcioglu, E. S., & Geijselaers, H. J. M. (2011). Prediction of the mechanical behaviour of TRIP steel. In A. E. Tekkaya, & G. Hirt (Eds.), International Conference on the Technology of Plasticity, ICTP 2011 (pp. 1-4). Aachen.