2022 №02 (03) DOI of Article
2022 №02 (05)

The Paton Welding Journal 2022 #02
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:

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


1. Hurada, H. (2003) High temperature materials for gas turbines. The present and future. In: Proc. of Int. Gas Turbine Congress-2003 (Tokyo, November 2-7).
2. Kablov, E.N., Petrushin, N.V., Svetlov, I.L., Demonis, I.M. (2007) Cast high-temperature nickel alloys for promising aviation gas-turbine engines. Tekhnologiya Lyogkikh Splavov, 2, 6-16 [in Russian].
3. Kablov, E.N., Petrushin, N.V., Elyutin, E.S. (2011) Single- crystal high-temperature alloys for gas turbine engines. Vestnik MGU, Ser. Mashinostroenie, 38-52 [in Russian].
4. (2006) Cast blades of gas turbine engines (alloys, technology, coatings). Ed. by E.N. Kablov. 2nd Ed. Moscow, Nauka [in Russian].
5. Kopelev, S.Z., Galkin, M.N., Kharin, A.A., Shevchenko, I.V. (1993) Thermal and hydraulic characteristics of cooled gas turbine blades. Moscow, Mashinostroenie [in Russian].
6. Fitzpatrick, G.A., Broughton, T. (1986) «Rolls-Royse Wide Chord Fan Blade» Int. Conf. on Titanium Products and Applications (San Francisco, California, USA, October 1986).
7. Yushchenko, K.A., Zadery, B.A., Gakh, I.S. et al. (2018) Prospects of development of welded single-crystal structures of heat-temperature nickel alloys. The Paton Welding J., 11-12, 83-90.
8. Wang, N., Mokadem, S., Rappaz, M., Kurr, W. (2004) Solidification cracking of superalloy single- and bi-crystals. Acta Materialia, 52, 3137-3182.
9. Park, J.W., Vitec, J.M., Bobu, S.S., David, S.A. (2004) Stray grain formation, thermomechanical stress and solidification cracking single crystal nickel base superalloy weds. Sci. and Technol. of Welding and Joining, 9(6), 472-482.
10. Anderson, T.D., DuPont, J.N. (2011) Stray grain formation and solidification cracking susceptibility of single crystal Nibase superalloy CMSX-4. Welding J., 2, 27-31.
11. Yushchenko, K.A., Zadery, B.A., Zvyagintseva, A.V. et al. (2008) Sensitivity to cracking and structural changes in EBW of single crystals of heat-resistant nickel alloys. The Paton Welding J., 2, 6-13.
12. Yushchenko, K.A., Zadery, B.A., Gakh, I.S. et al. (2013) On nature of random orientation of grains in welds of single crystals of high-temperature nickel superalloys. Metallofizika i Novejshie Tekhnologii, 35(10), 1347-1357 [in Russian].
13. Yushchenko, K.A., Zadery, B.A., Gakh, I.S. et al. (2013) Influence of weld pool geometry on structure of metal of welds on high-temperature nickel alloy single crystals. The Paton Welding J., 5, 45-50.
14. Zvyagintseva, A.V. (2007) Structural and phase transformations in high-temperature nickel alloys and their role in formation of cracks in welded joints. In: Syn. of Thesis for Cand. of Tekh. Sci. Degree. Kiev [in Russian].
15. 15.(1961) Radiography in physical materials science. Ed. by Yu.A. Bagryansky. Moscow, Metallurgizdat [in Russian].
16. Krivoglaz, M.A. (1983) Diffraction of X-ray beams and neutrons in abnormal crystals. Kiev, Naukova Dumka [in Russian].
17. Karasevskaya, O.P. (1999) Orientation X-ray experimental method of phase analysis. Metallofizika i Novejshie Tekhnologii, 21, 8 [in Russian].
18. Panin, V.E., Egorushkin, V.E., Panin, A.V. (2006) Physical mesomechanics of deformable solid body as the multilevel system. I: Basic physics of multilevel approach. Fizicheskaya Mezomekhanika, 9(3), 9-22 [in Russian].
19. Rybin, V.V. (2002) Fundamentals of formation of mesostructures during developed plastic deformation. Voprosy Materialovedeniya, 1(29), 11-33 [in Russian].
20. Hall, E.O. (1951) The deformation and ageing of mild steel. III: Discussion of results. Proc. Phys. Soc. B., 64, 747-753.
21. Petch, N.J. (1953) The cleavage strength of polycrystals. J. Iron Steel., 174, 25-28.
22. Trefilov, V.I., Milman, Yu.V., Firstov, S.A. (1975) Basic physics of strength of refractory metals. Kiev, Naukova Dumka [in Russian].
23. Jin-lai, Lіu et al. (2011) Influence of temperature on tensile behavior and deformation mechanism of Re-containing single crystal superalloy. Trans. Nonferrous Met. Soc. China, 21, 1518−1523.