Investigation of microstructure and tensile properties of as-processed TZM alloy at elevated temperature

Highlights: • As-processed TZM alloy were annealed for different temperatures observed by SEM. • The micro-hole aggregation and growth of fracture was used to explain ductile crack behavior through tensile test. • Strength and plasticity of forged TZM alloy could be increased by tensile test after annealing than rolled TZM alloy. • {112} was greater than {110} slip system in neck area for forged TZM alloy according EBSD technology. The high-temperature tensile properties and microstructures of as-processed (forged and rolled) TZM alloy were studied during thermoplastic deformation by uniaxial tensile tests at different annealing temperatures (850–1450 °C). The recrystallization phenomenon observed for rolled TZM alloy about 1300 °C and forged TZM alloy about 1400 °C. The forged state as an example, the annealing forged TZM alloy performed cup-shaped fracture by SEM being stretched at 1600 °C and studying the initiation, aggregation and growth of micropores during the fracture process were performed. ODF map was used to accurately prove the orientation distribution density in any orientation of forged TZM alloy space after annealing. The activation of the forged TZM alloy sliding system was related to the structure of the material, the deformation method and the force direction. Meanwhile, the high-resolution Electron backscatter diffraction (EBSD) technique was used to study thermoplastic deformation behavior and microstructure evolution of forged TZM alloy under different annealing temperatures in Channel5 software, getting a deeper deformation mechanism of forged TZM alloy during thermal deformation.