Microstructure Evolution and Deformation Behavior of High Strength Titanium Clad Steel Plate in the Thermal Compression

Abstract

This research involves conducting unidirectional axial thermal compression experiments on high‐strength titanium‐clad steel plates (TCSPs) at different temperatures and strain rates. Thermally compressed samples are evaluated for macromorphology, microstructure, macroscopic texture, and dislocation density. Deformation consistency is observed in α‐titanium under certain conditions, but not in β‐titanium. Pearlite is the main deformation microstructure near the steel interface, expanding with temperature. Striped grain clusters are observed in the α‐titanium near the interface, enhancing deformation uniformity; furthermore, the prevalence of striped grains increases with higher strain rates. However, dynamic recrystallization in β‐titanium hinderes deformation consistency. The fiber presence of texture <111>//ND ensures consistent deformation consistency, whereas the plate texture {0001} <100> in the α‐titanium encourages it. During the deformation process at a consistent rate of strain, it is observed that both matrices initially exhibit a rise, followed by a decline in dislocation density as the temperature increases, peaking at 850 °C. Dislocation density rises as strain rate increases, while temperature remaines constant. At temperatures exceeding 850 °C, bonding strengths decrease with deformation rate and remain comparable. Bonding strengths decreases at 800 °C due to intermetallic compound formation.