The Paton Welding Journal, 2022, №02



2022 №02 (03)

DOI of Article 10.37434/tpwj2022.02.04

2022 №02 (05)

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The Paton Welding Journal, 2022, #2, 26-32 pages

Destruction of welded joints of single-crystal high-temperature nickel alloys at tensile testing

K.A. Yushchenko, B.O. Zaderii, I.S. Gakh, G.V. Zviagintseva, T.O. Aleksiienko

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Mechanical properties were determined and features of destruction of welded joints on single-crystals of high-temperature nickel alloys at tensile testing in the range of temperatures close to working temperatures were studied. Two characteristic temperature ranges of destruction were found: 500‒800, 800‒1200 °С. In the first temperature range welded sample destruction occurs in the base metal at mixed fracture mode: brittle, quasibrittle and ductile. In the second range destruction takes place in the weld metal, fracture is multicenter, predominantly brittle with presence of secondary cracks. The considered features are related, mainly, to changes of the initial structure of the single-crystal, as a result of solidification and at cooling of the weld metal. These mainly are formation of a multilevel substructure, refinement of dendrites, γ- and γ′-phases, eutectic formations and carbides at reduction of dendrite liquation of the weld metal.
Keywords: single-crystal, high-temperature nickel alloys, welded joint, weld, tensile testing, temperature ranges of destruction, destruction features, microstructure

Received: 02.12.2021
Accepted: 31.03.2022

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