Formation of Deformation Twin and Sub Gain for Strengthening of CP-Ti through RCSR with Multiple Number of Passes

This research looks at the microstructure and mechanical properties of commercially pure titanium that has been subjected to the Repetitive Corrugation and Straightening by Rolling (RCSR) and Intermediate Annealing processes.The RCSR methodology offers notable advantages, including process simplicity, operation at room temperature, and seamless integration with existing industrial rolling systems.Unlike other severe plastic deformation (SPD) techniques that require complex and specialized tooling, RCSR stands out as a more practical and industry-friendly approach.Scanning Electron Microscope was used to analyse the microstructure of deformed specimens that had multiple passes.The image revealed that deformation twining and sub grain formation were observed after RCSR, and that this increased as the number of passes increased.The intermediate annealing allowed the number of passes to be increased from 10 to 14. Vickers hardness tester was used to determine the microhardness.Due to the dynamic recrystallization (DRX) process, the microhardness was increased by 87 percent after 14 passes when compared to base metal without RCSR.After 14 passes,the specimen has become stronger and has formed a surface crack.This comprehensive study uniquely investigates the microstructural evolution and hardness properties of CP-Ti subjected to up to 14 passes of RCSR at room temperature, followed by an immediate annealing process.