Author(s)

K. Natori, R. Kishi, H. Shimahara, Y. Arao & T. Tanaka

Abstract

The mechanism of strain rate dependence on the Bauschinger effect in dualphase type high strength steel sheets is investigated and the influence of mesostructure differences on spring-back is estimated in this study. Compression-tensile tests at a strain rate from 0.007/s to 100/s is conducted. To differentiate between the multiphase structure-induced effect and the matrix properties, the same tests are also conducted for ferrite single phase steel. As a result, the Bauschinger effect on dual phase steel is not associated with the matrix properties independently. Moreover, it is revealed that a multiphase structure-induced effect acts a dominant function for deformation characteristics through experiments and micro observations. Keywords: sheet metal forming, Bauschinger effect, strain rate dependence, high strength steel, dual phase, multiscale analysis, mesoscale structure.

Keywords

sheet metal forming, Bauschinger effect, strain rate dependence, high strength steel, dual phase, multiscale analysis, mesoscale structure.