Scale Bridging Modeling of Plastic Deformation and Damage Initiation in Polycrystals

A constitutive model for transformation induced plasticity (TRIP)-assisted steels is proposed that considers the elastic-plastic deformation of ferrite and austenite, the austenite-martensite phase transformation and the elastic deformation of martensite. Within this model, an explicit relation between martensite nucleation and plastic deformation within an austenite grain has been established based on the inverse Nishiyama-Wassermann relationship. In particular, strain-induced martensite nucleation and stress-assisted martensite growth have been included in one model with the help of a thermodynamic principle. Furthermore, the formulation of the stress-assisted martensite growth has been enhanced to include commonly observed physical mechanisms infl uencing the martensite transformation and global mechanical behavior of low alloyed TRIP-assisted steels. With this model, we found consistently with experiment that the TRIP effect enhances the effective work hardening rate and hence is benefi cial for improving strength and ductility of steels. The mechanical anisotropy produced by stress-assisted and strain-induced phase transformations are signifi cantly different. We observed that austenite grains transform to martensite more quickly under tension than under compression. Furthermore, the infl uence of alloy composition, martensite lamellar structure, transformation rate and active transformation systems on the strength and ductility of low alloyed TRIP-assisted steels has been investigated. We fi nd that this refi ned model reliably captures the infl uence of alloy composition, temperature, and martensite lamellar structure. It is shown that the choice of the orientation relationship between austenite and the martensite does not signifi cantly infl uence the global mechanical behavior of TRIP-assisted steel.

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Scale Bridging Modeling of Plastic Deformation and Damage Initiation in Polycrystals

Cited by 3 publications

References 29 publications

Numerical modeling of dual phase microstructure behavior under deformation conditions on the basis of digital material representation

Numerical modeling of dual phase microstructure behavior under deformation conditions on the basis of digital material representation

Fracture toughness testing at the micro-scale − The effect of the unloading compliance method

A study of deformation and phase transformation coupling for TRIP-assisted steels

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