Microstructure Evolution of Electron Beam Physical Vapour Deposited Ni-23.5Cr-2.66Co-1.44Al Superalloy Sheet During Annealing at 600 °C

microstructure evolution of electron beam physical vapour deposited (eb-pvd) ni？23.5cr？2.66co？1.44al superalloy sheet during annealing at 600 °c was investigated. the results showed that the as-deposited alloy was composed of only g phase. after annealing at 600 °c, the locations of diffraction peaks were still the same. the (220) diffraction peak of the deposition side increased with annealing time. the sheet on deposited side had a tendency toward forming (220) texture during post-annealing. no obvious texture was observed at as-deposited and annealed sheet at 600 °c in substrate side. the count and size of "voids" decreased with time. the size of grains increased obviously with annealing time. the ultimate tensile strength of eb-pvd ni-23.5cr-2.66co-1.44al alloy sheet increased from 641 mpa to 829 mpa after annealing at 600 °c for 30 hours.