Abstract
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.
Highlights
Ni-based superalloys are one kind of the most promising materials developed for the high-temperature applications and are extensively used in aerospace industry for its excellent elevated temperature properties[1]
We could preliminarily infer that the superalloy sheet on deposited side had a tendency of forming a (220) texture during post-annealing
As promoted by annealed at 600 °C for 30 hours, the values reached 829 MPa, which suggested that post-heat treatment had abilities to improve the mechanical properties of this kind of sheets, and had ability to meet the requirements of metallic thermal protection system
Summary
Ni-based superalloys are one kind of the most promising materials developed for the high-temperature applications and are extensively used in aerospace industry for its excellent elevated temperature properties[1]. Ni-based superalloy sheets are able to be used for producing metallic thermal protection systems for Reusable Launch Vehicles[2,3,4,5]. The large-scale microcrystal Ni-based superalloy sheets have been developed in our group. The Electron Beam Physical Vapour Deposition (EB-PVD) process offers many desirable characteristics such as relatively high deposition rates, dense coatings, controllable composition, and low contamination[6]. The microcrystal superalloy sheets canbe fabricated by electron-beam physical vapor deposition (EB PVD) method because the technique can provide deposition rate up to 100 nm/s[8]. The materials produced by EB PVD technique are dense with controlled compositions and microstructures[7,8]. The 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
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