Abstract
This study aims to analyze the effect of thermo mechanical coupling damage in the presence of a phase change (austenite/martensite) in 35NCD16 steel. The impact of increasing mechanical traction load, accompanied by a martensitic transformation on the scale of a single grain with boundary has been studied. The prediction transformation of induced plasticity (TRIP) was evaluated by taking into account the following parameters: twenty shear directions of the martensitic plates, two values of the shear deformation of the martensitic plates, energetic and thermodynamics criteria for getting in order the transformation of the martensitic plates, elastoplastic behavior of the two areas in the first case (martensitic plate and grain boundary) and elastic behavior for the grain boundary in the second case. The numerical calculation is carried out using the finite element method (FEM), implemented in the Zebulon calculation code. The developed approach is validated using the available experimental results reported in the literature. The numerical results showed that the estimation of TRIP given by the energetics criteria with the values of the shear deformation (γ0 = 0.16) are closer to the experiment results.
Highlights
The deformation transformation is accompanied by an additional plastic deformation, or plasticity of transformation commonly called transformation of induced plasticity (TRIP)
Two types of mechanical behavior have been used, the first considers an elastoplastic behavior for the formation of martensitic plate’s area and the grain boundary, the second admits an elastic behavior for only the grain boundary
The final values of trip obtained with the three criteria, namely Average Mechanical driving Force (AMDF) (γ0 = 0.16) and Max Mechanical Driving Force (MMDF) (γ0 = 0.16) are almost equal and slightly lower compared to that given by the experience [25]
Summary
The deformation transformation is accompanied by an additional plastic deformation, or plasticity of transformation commonly called TRIP This phenomenon takes place in steels solid phase change, under the application of the stress even lower than the elastic limit of austenite [1]. The second mechanism given by Magee [10] explains the phenomenon of TRIP in the case of martensitic transformation by the variation in volume, resulting from the formation of plates during transformation, under the effect of an external weak stress (lower than the elastic limit of austenite) [11]. Several analytical and numerical models have been proposed to satisfactorily describe the value and the kinetics of the plastic transformation flow (TRIP) These models are generally based on several micro-macro approaches, without taking an interest in the fine evolution of the microstructure. The influence of the numerical calculation parameters on the final value and the TRIP kinetics have been discussed and compared with the experimental results reported in the literature [25]
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