Abstract

MINGWEI, Li et al. Microstructure Evolution of Electron Beam Physical Vapour Deposited Ni-23.5Cr-2.66Co-1.44Al Superalloy Sheet During Annealing at 600 °C. Mat. Res. [online]. 2013, vol.16, n.1, pp. 88-93.  Epub Oct 26, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000145.

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.

Keywords : Physical Vapour Deposited (EB-PVD); Ni-based superalloy; annealing; microstructure.