EBSD Study of Microstructural Development during Superplastic-Like Forming

Abstract

Superplastic-like forming takes advantages of both deep drawing and bulge forming. The use of non-superplastic grade materials enables it to be more compatible with existing forming process with less material and time cost. Here, a non-isothermal heating system was adopted to selectively heat up selected localized areas to form the workpiece more efficiently. Electron backscattered diffraction (EBSD) was then used to investigate the wide range of grains in the formed samples resulting from elevated-temperature and large-strain deformation. The crystallographic textures of the material before and after deformation were observed for comparison. Very little recrystallization was found in the midst of the deformed grains. Considerable amount of elongated grains with high angle boundaries were produced during deformation. Many subgrain boundaries have developed within the big grains due to dynamic recovery.