Improving the stamping formability of rolled titanium/iron composite sheets by annealing

Abstract

Rolled sheets are not suitable for stamping due to their poor formability. In this research, the stamping formability of the rolled titanium/iron composite sheet was improved by annealing. The mechanism for improving the stamping formability was studied by analyzing the changes in the microstructure, texture, and interface. It was found that after annealing at 660 °C for 1 h, the stamping formability was significantly improved, namely plasticity was improved, anisotropy was decreased and the interface showed good bonding properties. Another important finding of this study was that the textural evolution of the metal layers also influenced the occurrence of interfacial delamination during stretching. The decrease in the angle of inclination of the normal grain in the titanium layer and the increase in the γ-fiber in the iron layer resulted in a decreasing trend in the thickness thinning of the composite sheet. Therefore, although a significant reduction in the interfacial peel strength occurred after annealing, no premature interfacial delamination occurred.