Precipitation behavior of a novel cobalt-based superalloy subjected to prior plastic deformations

Isothermal oxidation behavior of W‐free Co–Ni–Al‐based superalloy at high temperature

“…2Mo 9 (10) Figure 11 shows the comparison of oxidation activation energy between Co-Ni-Al-based superalloys and prior Co-Al-W superalloys. [34] The activation energy of the 2Cr superalloy is close to that of the Co-9Al-7.5 W superalloy and exceeds that of most Co-Al-W superalloys with available data, indicating that Co-Ni-Al-based superalloys need to conquer a greater energy barrier at the beginning stage of oxidation progress.…”

“…Until 2015, Makineni et al [4,5] developed new W-free Co-based superalloys with additions of Mo and Nb, and then other W-free γ′-strengthened Co-based superalloys have been developed by researchers, such as Co-Nb-V, [6] Co-V-Ta, [7] Co-Al-Ta, [8] Co-Ti-Cr, [9] Co-Ni-Cr. [10] Therefore, the development of W-free Co-based superalloys by replacing W with Nb, V, Ta, and other alloying elements with the aim of reducing the density of superalloys is expected to achieve excellent high-temperature performance. [11] Adjustment of alloying elements is considered as an effective path to obtain a Co-based superalloy with excellent mechanical properties.…”

Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

“…The preheating process has three advantages, such as improving the conductivity of powder to help the electrons flow out of the build bed, minimizing thermal gradient to reduce the internal stress in the build part and maintaining a uniform temperature in the build part. Presently, EBM has been attracting wide attention because of its ability to be applied to advanced metal alloys, such as cobalt-based alloy [12,13,14], nickel-based alloy [15], titanium and titanium-based alloy [16,17], stainless steels [18,19], etc. [20,21,22].…”