Abstract
In the present work, the high-temperature deformation behavior of a U720LI alloy was investigated by means of hot compression tests at temperatures of 1060–1180 °C, strain rates of 0.001–10s−1 under true strain of 0.8. The Arrhenius-type model, considering the dissolution of γ′ precipitates, was established on the basis of the friction and adiabatic heating corrected flow stress data. The hot deformation activation energies for quasi-γ phase and γ+γ′ dual-phase microstructures were determined as 417 kJ mol−1 and 687 kJ mol−1, respectively. The high activation energy for γ+γ′ dual-phase microstructures was mainly attributed to the precipitation hardening effect of γ' (Ni3(Al,Ti)) particles which hindered dislocation slip via the pinning effect during hot deformation. The processing map was developed based on the dynamic material model. According to the detailed microstructural investigations, the optimum hot deformation domains of U720LI alloy were identified as 1080–1100 °C/0.01–0.3s−1 for γ+γ′ dual-phase microstructure and 1140–1160 °C/0.01–0.1s−1 for quasi-γ phase microstructure, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.