Experimental and numerical studies for plastic deformation of grain oriented silicon steel

Abstract

Grain Oriented silicon steels having (110)[001] Goss texture are usually produced by cold rolling processes at a rolling reduction above 80%, which can develop surface crack and failure and eventually cause yield drop. Thus, it is essential to characterize a deformation behavior of silicon steels under various forming conditions. In this study, tensile tests for the different specimen direction were carried out at a strain rate 0.00038/s and in temperature range from room temperature to 300℃. A digital image correlation (DIC) method combined with the miniaturized tensile stage was used to characterize deformation field of the single crystal specimen. After which, to observe the effect of the temperature, stress-strain curve was obtained through dic results. The initial and final crystallographic orientations of the tensile specimen were measured in a field-emission microscopy(FE-SEM) by using electron backscatter diffraction (EBSD). A phenomenological modification of constitutive model has been made to predict deformation response of single crystals under tensile loading.