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Representative volume element (RVE) studies for the simulation of mechanical effects related to transformation induced plasticity

Wednesday (28.09.2016)
11:15 - 11:30
Part of:

Transformation induced plasticity (TRIP) is an essential feature of the class of martensitically transforming steels and is of great interest to material researchers as well as to industry, e.g. in automotive engineering. The advantageous combination of strength and ductility and hence the enhanced formability of TRIP-steels provide the potential for weight optimization. For the investigation of the TRIP effect the commercial steel grade MarvalX12 [1] – a maraging steel exhibiting characteristic TRIP behavior with a complete transition from austenite into martensite - has been chosen.

A representative volume element (RVE) based on [2] and [3] has been set up and discretized where each element represents an initially austenitic domain that is subjected to martensitic transformation simulated by an instantaneous toggling of the element's properties. The transformation sequence of these elements is determined by the evolution of the phase fraction rate, which is a function of temperature, stress as well as plastic and transformation strains. The transformation hardening relation, developed by [4] and modified in the present work determines the shape of the kinetics itself including the beginning of the phase change, where the slow nucleation phase turns into the sharp growth phase of the martensitic domains. The application of such a comprehensive kinetics expression for the RVE model allows the simulation of the complex transformation behavior taking into account the temperature, stress and strain influence.

The model is capable of reproducing the experimentally determined behavior of MarvalX12 for a wide range of loading cases including non-proportional loading paths. It can also be used to calibrate the macroscopic mean-field model developed in [2].

[1] K. Nagayama, T. Terasaki, K. Tanaka, F. Fischer, T. Antretter, G. Cailletaud and F. Azzouz, Materials Science & Engineering, pp. 25-37, (2001)

[2] M. Fischlschweiger, G. Cailletaud and T. Antretter, International Journal of Plasticity, pp. 53-71, (2012)

[3] E. Hasenhütl, Diploma Thesis, Montanuniversität Leoben (2012)

[4] M. Fischlschweiger, T. Antretter and G. Cailletaud, Mechanics Research Communications, pp.84-88, (2013)

Alexander Sannikov
Materials Center Leoben Forschung GmbH