Modeling of work hardening behaviour of high Mn and low C polycristalline austenitic steel with twip effect

• Published in: Matéria Vol. 15; no. 2; pp. 143 - 150
• Main Authors: Spindola, M.O., Ribeiro, E.A.S., Gonzalez, B.M., Santos, D.B.
• Format: Journal Article
• Language: English
• Published: Rede Latino-Americana de Materiais 2010
• Subjects: CONSTRUCTION & BUILDING TECHNOLOGY; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; modeling and simulation; TWIP effect; annealing
• ISSN: 1517-7076; 1517-7076
• DOI: 10.1590/S1517-70762010000200009

The steel of this work, 0.06C-25Mn-3Al-2Si-1Ni steel, presenting TWIP effect, was hot and cold rolled and then annealed at temperatures between 600 and 850ºC. The microstructure examination was focused in the recrystallization during annealing for different temperatures through optical and scanning electron microscopy. The volume fraction and recrystallized grain size measurements were performed. Tensile tests were conducted at room temperature. A polycrystalline model, based on micromechanics and working hardening theory, developed by Bouaziz et al., to predict the behavior of TWIP steels under different loading paths, was applied to the current steel. The results from the model are in good agreement with mechanical test and show a total elongation above 60%, uniform elongation up to 55% and a tensile strength greater than 600 MPa, which highlights the potential of this steel for its various applications, mainly automotive industry. The model parameters are discussed and their limitations are presented.