Assessment of the mechanical properties of the high-temperature area in the heat-affected zone during surfacing of a difficult-to-weld nickel-based superalloy

Keywords

nickel-based superalloy, fusion welding, high-temperature region of the heat-affected zone, longitudinal static tensile test, critical fracture strain.

Cite as

Yarovytsyn O. V., Cherviakov M. O., Khrushchov H. D., and Volosatov I. R. Assessment of the mechanical properties of the high-temperature area in the heat-affected zone during surfacing of a difficult-to-weld nickel-based superalloy. Physicochemical Mechanics of Materials. 2025. 61(2), 118-124.

https://doi.org/10.15407/pcmm2025.02.118

Abstract

A method for assessing the mechanical properties and deformation capacity of the high-temperature area of the heat-affected zone (HAZ) during fusion welding of the ZhS6-type hard-to-weld polycrystalline nickel-based alloys was developed. The proposed method is based on the use of a miniature plane proportional two-layer specimen, cut from a nickel-based superalloy plate with a single layer of deposited metal on its edge. The gauge section of such a specimen contains longitudinally interfused layers of the base metal and the highly ductile deposited metal of Inconel 625 alloy. Through longitudinal tensile tes­ting of such specimens within the 20–1100°C temperature range, the critical fracture strain for the high-temperature area of the HAZ was experimen­tally determined, and the corresponding ultimate tensile strength was calculated. It is established that, at tempera­tures of 600–1000°C, the high-temperature area of the HAZ in ZhS6U and ZhS6K nickel-based superalloys exhibits a low-ductility state, with a critical fracture strain of 0.3–1%. It is shown that the obtained results expand the understanding of hot crack formation mechanism during fusion welding, compared to previous studies con­ducted using the standard Varestraint test method.

References

1. P. D. Zhemanyuk, I. A. Petrik, and S. L. Chigilejchik, “Experience of introduction of the tech¬nology of reconditioning microplasma powder surfacing at repair of high-pressure turbine blades in batch production,” The Paton Welding J., No. 8, 43-46 (2015). https://doi.org/10.15407/tpwj2015.08.08
2. K. A. Yushchenko, O. V. Yarivytsyn, G. D. Khrushchov, I. A. Petryk, and S. L. Chygyleichyk, “Research and optimization of serial repair of blades of aircraft gas turbine engine D-18T by microplasma powder surfacing,” Kosmichna Nauka i Tekcnologiya [in Ukrainina], Is. 3 (28), 3-16 (2022). https://doi.org/10.15407/knit2022.03.003
3. ISO 17641-1: 2004 Destructive Tests on Welds in Metallic Mmaterials – Hot Cracking Tests for Weldments – Arc Welding Processes – Part 1: General, ISO copyright office (2004).
4. C. Sims, N. Stoloff, and W. Hagel, Superalloys II. High-Temperature Materials for Aerospace and Industrial Power, John Wiley & Sons, New York (1987).
5. J. N. DuPont, J. C. Lippold, and S. D. Kiser, Welding Metallurgy and Weldability of Nickelbase Alloys, John Wiley & Sons, New York (2009). https://doi.org/10.1002/9780470500262
6. A. F. Belyavin, V. V. Kurenkova, and D. A. Fedotov, “Fatigue life of deposited repair welds on single-crystal high temperature nickel alloy under cyclic oxidation,” The Paton Welding J., No. 2, 12-23 (2014). https://doi.org/10.15407/tpwj2014.02.02
7. K. A. Yushchenko, O. V. Yarovitsyn, O. O. Nakonechnyi, I. R. Volosatov, O. O. Fomakin, and G. D. Khrushchov, “Development of the technology of reconditioning the sealing element of nozzle blade sector from difficult-to-weld high-temperature nickel alloy of ZhS6 type by microplasma powder surfacing,” The Paton Welding J., No. 11, 25-28 (2020). https://doi.org/10.37434/tpwj2020.11.05
8. N. Czech, F. Staif, V. S. Savchencko, and K. A. Yushchenko, “Evaluation of the Weldability of the Gas Turbine Blade Materials IN 738LC and Rene 80,” Materials Solutions’97 on Joining and Repair of Gas Turbine Components, ASM International®, Ohio (1997), pp. 7-10
9. K. A. Yushchenko, V. S. Savchenko, L. V. Chervyakova, S. David, and J. Vitek, “Investigation of weldability of nickel superalloys and development of repair technology for gas turbine blades,” The Paton Welding J., No. 6, 2-5 (2005).
10. I. A. Petryk, Welding and Brazing Restoration Processes of Gas Turbine Engine Blades Made of Difficult-to-Weld Nickel- and Titanium-based Alloys, Phd Thesis, [in Ukrainina], Kyiv (2007).
11. ISO/TR 17641-3: 2005 Destructive Tests on Welds in Metallic Materials – Hot Cracking Tests for Weldments – Arc Welding Processes – Part 3: Externally Loaded Tests, ISO copyright office, 2005.
12. ОСТ Standard. 1 90126-85. Heat-Resistant Casting Alloys of Vacuum melting, [in Russian] (1985).
13. ISO/ASTM 52900:2015(E). Standard Terminology for Additive Manufacturing – General Principles – Terminology. ISO copyright office. – 2015.
14. K. A. Yushchenko, A. V. Yarovitsyn, N. O. Chervyakov, A. V. Zvyagintseva, I. R. Volosatov, and G. D. Khrushchov, “Evaluation of short-term mechanical properties of a joint of difficult-to-weld nickel high-temperature alloys of ZhS6 type,” The Paton Welding J., No. 7, 29-35 (2019). https://doi.org/10.15407/tpwj2019.07.07
15. Roger C. Reed, The Superalloys Fundamentals and Applications, Cambridge University Press (2006).