Analysis of Microstructure, Texture Evolution, and the Mechanism of Grain Refinement of Commercially Pure Titanium During Cold Rolling: Experiment and Simulation

Abstract

A comprehensive understanding of the microstructures and texture evolutions during the rolling process is of great significance for the preparations of high‐quality commercially pure titanium (CP‐Ti) sheets. Therefore, in the present work, the effects of rolling reductions on the microstructures and textures of CP‐Ti are investigated by optical microscope, electron backscatter diffraction, and X‐ray diffraction. A crystal plasticity finite element model (CPFEM) is developed to accurately predict the rolling deformation behaviors of CP‐Ti sheets. The results show that the slip and twinning including , compression twins and extension twins are prone to plastic deformations during the whole rolling process. The c‐axes of grains gradually tilt toward the transverse direction and the grains gradually deviate from the original //rolling direction (RD) to //RD. As a result, the mixed textures of and are developed in the specimen. The grain refinements are closely linked with the developments of and twins. In addition, the twin fractions and texture evolutions are well predicted by the CPFEM model. These results documented in this work should not only help to elucidate the microstructures and texture evolutions of CP‐Ti, but also shed important light on improving its properties.

Indentation of Commercial Pure Titanium Processed by Cold Rolling

“…To enhance its comprehensive mechanical performance, cold rolling method combined with heat treatment is applied to refine grain sizes of commercial pure titanium (CP-Ti) [14][15][16]. Sun et al [17] investigated the impacts of the rolling reductions on the textures and microstructures evolutions of CP-Ti sheets and developed an accurate crystal plasticity finite element model to predict its rolling deformation behaviors. The results showed that the twins, including the extension twins and compression twins, and the slip become more likely contribute to the plastic deformations during the total rolling process.…”