Characterization of the relation among the mechanical behavior and the texture features in high martensitic dual phase steels

Abstract

Dual Phases are martensite-ferrite steels. In the present study the formability and the mechanical properties of two different dual phase steels with high content of martensite (60% and 80%) were analyzed to obtain a better understanding of the relationship among texture, microstructure and plastic anisotropy in these steels. The formability was evaluated by the measurement of the Lankford coefficients and the formability limit curves (FLD). The results were related to the crystallographic texture that was determinated by X-ray diffraction and by Electron Back Scattering Diffraction (EBSD) analysis in order to evaluate the possible influence of the presence of martensite. The intensity of texture components and the values of planar and normal anisotropy show the better formability of the steel with higher content of martensite. © 2005 ISIJ.