Semi phenomenological modelling of the behavior of TRIP steels

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tA new semi-phenomenological model is developed based on a mean-field description of the TRIP behavior for the simulation of multiaxial loads. This model intends to reduce the number of internal variables of crystalline models that cannot be used for the moment in metal forming simulations. Starting from local and crystallographic approaches, the mean-field approach is obtained at the phase level with the concept of Mean Instantaneous Transformation Strain (MITS) accompanying martensitic transformation. Within the framework of the thermodynamics of irreversible processes, driving forces, martensitic volume fraction evolution and an expression of the TRIP effect are determined for this new model. A classical self-consistent scheme is used to model the behavior of multiphased TRIP steels. The model is tested for cooling at constant loads and for multiaxial loadings at constant temperatures. The predictions reproduce the increase in ductility, the dynamic softening effect and the multiaxial behavior of a multiphased TRIP steel.

On the Taylor–Quinney coefficient in dynamically phase transforming materials. Application to 304 stainless steel

“…in multiphase TRIP steels Lim et al, 2012) and metastable austenitic grades (Lindgren et al, 2010;Kubler et al, 2011). These two alloys are frequently used by the industry for energy absorption in crash (Rodrí-guez-Martínez et al, 2010b;Andersson, 2005) or blast protection applications Schleyer, 2005a,b, 2006) due to their ductility and work hardening ability.…”

A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates

“…Lee et al (2010) pro posed a rate dependent crystal plasticity model which considers martensitic transformation, and used it to study the influ ence of strain rate (within the range 10 4 10 1 s 1 ) on the deformation of a TRIP steel. Kubler et al (2011) developed a semi phenomenological model for the thermomechanical behavior of TRIP aided steels. The model is based on a mean field description of the plastic and transformation strains in the different phases and presents the advantage, compared to a crys tallographic model, of a reduced number of internal variables, permitting its use in the simulation of metal forming processes.…”

A Computational Investigation on Bending Deformation Behavior at Various Deflection Rates for Enhancement of Absorbable Energy in TRIP Steel

“…Mahnken et al [4] proposed a macroscopic model to simulate the interactive mechanism of phase transformation and plasticity. Kubler et al [31] introduced a semi-phenomenological model. Recent work done by Fischlschweiger et al [32] included the effect of back stress into a mean-field model for non-proportional loadings.…”