Dislocations, vacancies and solute diffusion in physical based plasticity model for AISI 316L

• Published in: Mechanics of materials 2008-11, Vol.40 (11), p.907-919
• Main Authors: Lindgren, Lars-Erik, Domkin, Konstantin, Hansson, Sofia
• Format: Article
• Language: English
• Subjects: Applied sciences; Austenitic stainless steel; Diffusion; Dislocation density; Dynamic strain ageing; Elasticity. Plasticity; Exact sciences and technology; Flow stress; Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Material Mechanics; Materialmekanik; Measurement and testing methods; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Physics; Solid mechanics; Steel Forming and Surface Engineering; Structural and continuum mechanics; Stålformning och ytteknik; Vacancy concentration; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
• ISSN: 0167-6636; 1872-7743; 1872-7743
• DOI: 10.1016/j.mechmat.2008.05.005

A physical based model for the evolution of flow stress of AISI 316L from room temperature up to 1300 °C, strains up to 0.6 and strain rates from 0.0005 up to 10 s −1 is developed. One set of tests have been used for model calibration and another more complex set of tests for its validation. The model is based on a coupled set of evolution equations for dislocation density and (mono) vacancy concentration. Furthermore, it includes the effect of diffusing solutes in order to describe dynamic strain ageing (DSA). The model described the overall flow stress evolution well with exception of the details of the effect of the DSA phenomenon. Its numerical solution is implemented in a format suitable for large-scale finite element simulations.