The influence of plastic deformation on the elastic properties that determine the magnitude of springback following forming was investigated using dynamic modulus analysis. For this study, the elastic modulus of TRIP 700 steel was measured continuously at 35 C and a loading frequency of 1.0 Hz for 1,000 minutes following deformation by cold rolling to varying levels up to 27 %. The elastic modulus increased at an exponentially decaying rate during these experiments and with a magnitude that increased with pre-strain. These observations are consistent with the hypothesis that deformation creates microstructural defects that contribute compliance when the stress state changes and that these defects are removed by annealing at this low temperature.
Citation: Journal of Materials Engineering and Performance
Pub Type: Journals
anelastic, dynamic modulus analysis, elastic modulus, forming, modulus recovery, springback, TRIP steel