Trip effect on the modeling of Thermo-mechanical behaviour of steels during quenching process

The prediction of the residual stresses generated by heat treatment of steel parts is a complex and insufficiently controlled task due to several couplings between heat conduction, phase transformations and mechanical behaviour of material. Phase transformations during quenching induce plasticity that fairly higher than classical plasticity of multiphase material that its properties are estimated from linear law of mixture components properties. Various models were proposed to take into account of the so called transformation induced plasticity (trip) in the modeling of mechanical behavior of steel that undergoes phase transformation during quenching. In this way, two approaches for the mechanical modeling taking into account of trip are proposed. In the first approach, an increment of deformation labeled transformation induced plasticity increment is added to classic deformations increments so the plastic flow rule is modified. The second approach uses the classical thermo-elastoplastic scheme with specific evolution of yield stress of multiphase material during quenching. The validity of these approaches is discussed on the light of the results gotten from the literature. © Springer-Verlag Berlin Heidelberg 2013.