CARACTERÍSTICAS DO ENCRUAMENTO DO AÇO TWIP ALTO Mn E BAIXO CARBONO LAMINADO A FRIO E RECOZIDO
Résumé
There is a current need for the automotive industry for materials that combine high formability, high strength
and low specific weight in order to reduce fuel consumption and increase passenger safety. In this context, appears
the TWIP steel (TWinning Induced Plasticity), defined as a steel with high content of manganese and, yet, silicon and
aluminum (2% to 4%) in its composition. Its main feature is the formation of twining under stress. In this study, it was
investigated how the characteristics of hardening work of the steel C-0,06, Mn-25, Al-3, Si-2, Ni-1, with TWIP effect, hot
and cold rolling and annealing at temperatures varying between 600°C and 850°C, influences their mechanical properties.
This research used optical micrography and scanning electron microscopy (SEM) for assessment of grain size and volume
fraction of recrystallized grains. To complement this study, tensile tests were performed. The hardening work study
uses the approach of Hollomon associated with the Considère criterion. The sample annealing to 850°C shows a work
hardening exponent of 0.55, 66% of total elongation and maximum strength of 700 MPa.