Influence of zinc coating on anisotropic mechanical properties of hot dip galvanized steel sheet DP600

Abstract

The influence of zinc coating on the anisotropic mechanical properties of hot dip galvanized steel sheet DP600 is studied by tensile test. The results show that zinc coating makes the yield strength of the steel plate decrease, but has no obvious influence on the hardening index. Compared with the bare steel sheet, in the direction of R00 direction parallel to the rolling direction, the tensile strength and yield strength of galvanized steel sheet decrease, while the elongation and thickness anisotropy coefficient increase. After comprehensive analysis, it is found that the plastic deformation ability has decreased in the direction of R00 direction. and the plastic deformation ability decreases after comprehensive analysis. In the R90 direction, the mechanical property parameters of galvanized sheet all increased, and zinc coating improves the plastic deformation ability of the steel sheet. However, in the R45 direction, the variation extent of the mechanical property parameters of galvanized steel sheet is between R00 and R90. Therefore, the influence of zinc coating on the mechanical properties of steel plate is closely related with the rolling direction, which also illustrates that the adhesion strength between the galvanized layer and steel plate substrate is affected by the surface microstructure of rolled steel sheet.