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2020 №11 (04) DOI of Article
10.37434/as2020.11.05
2020 №11 (06)

Automatic Welding 2020 #11
Avtomaticheskaya Svarka (Automatic Welding), #11, 2020, pp. 27-31

Development of the technology of reconditioning the sealing element of nozzle blades from difficult-to-weld high-temperature nickel alloy of ZHS6 type by microplasma powder surfacing

K.A. Yushchenko, O.V. Yarovitsin, O.O. Nakonechniy, I.R. Volosatov, O.O. Fomakin, G.D. Khrushchov
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

In order to ensure the technological strength at reconditioning of the side sealing element of a sector of nozzle blades from ZhS6K alloy with the required deposition volume of 7…13 cm3, a less heat-resistant material with sufficient deformability was selected. At microplasma powder surfacing it is characterized by the following level of values of short-time strength relative to the deposited metal ZhS6K: at 20 °С – 0.7…0.8; at 1000 °С – 0.5…0.55. Compared to the known technological solutions based on filler materials of ІN625 type, it allowed increasing the level of deposited metal high-temperature strength by practically 2 times at 1000 °С at effective limitation of high-temperature ductility ε1000 °С ≤ 1.0…1.5 %. Proceeding from the described materials science studies, PWI developed a new repair technology of microplasma powder surfacing that has successfully passed experimental-practical trials at SE «Lutsk Repair Plant «Motor». 10 Ref., 2 Tabl., 5 Fig.
Keywords: high-temperature nickel alloy ZhS6K, microplasma powder spraying of 7…13 cm3 volume, deformability, technological strength, short-time strength values, repair technology


Received: 07.10.2020

References

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