Automatic Welding, 2024, №04

2024 №04 (03)

DOI of Article 10.37434/as2024.04.04

2024 №04 (05)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #4, 2024, pp. 32-41

High-temperature creep testing of difficult-to-weld nickel-based superalloy samples with micro-plasma powder deposition

O.V. Yarovytsyn, M.O. Chervyakov, O.O. Nakonechnyi, O.O. Fomakin, S.O. Voronin, O.F. Yavdoshchina

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: yarovytsyn@ukr.net

The procedure of high-temperature uniaxial сrеер testing for welded joints of “base-deposited metal” made of difficult-to-weld nickel-based superalloys of ZhS32 type, containing more than 60 vol. % of the strengthening γ΄-phase, has been developed. It allows using witness samples to estimate the сrеер strength level at temperatures of 975 and 1000°С for the conditions of restoration of the edges of serial blades of modern aircraft gas turbine engines by micro-plasma powder welding deposition process. Its development took into account the need to go to larger sizes and, accordingly, the higher restraint conditions of the welded workpieces for manufacture of samples for mechanical tests, compared to typical conditions of serial restoration of the blade edge in industry, and some methods for hot cracks prevention were also proposed. Its feature is the use of “dovetail” type grips for samples with the working part of 7.5-9.0 mm2, which allows significantly reducing their size. The proposed approach of choosing the shape and dimensions of the sample, the technique of preparing and forming the welded workpieces necessary for it by micro-plasma powder deposition allows significantly reducing the heat input, bringing the deposition modes of the witness samples closer to the industrial modes of serial restoration of the edges of blades of aircraft gas turbine engines. Due to that, it was possible to avoid the known manifestations of the tendency to crack formation during the deposition process and post weld heat treatment in the welded joints of the “base-deposited metal” of the nickel-based superalloys with directional crystallization, which are the workpieces for subsequent production of such witness samples. The developed procedure was tested to evaluate the creep strength of ZhS32 deposited metal samples and “50% base (ZhS26-VI or Zh32-VI) + 50% deposited (ZhS32) metal” samples at 975°C and 1000°C on the base of 40 hours holding and comparison of the relevant experimental data with the technical condition requirements for these cast nickel-based superalloys. 22 Ref., 3 Tabl., 11 Fig.
Keywords: micro-plasma powder welding deposition, welded joint of “base-deposited metal”, difficult-to-weld nickel-based superalloys, сrеер strength

Received: 04.04.2024
Received in revised form: 18.05.2024
Accepted: 08.07.2024

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