The influence of corrosion damage on the thermal fatigue resistance of superalloys

The aim of the research is to develop a method for evaluating the effect of high-temperature corrosion damage on the thermal fatigue resistance of samples made of heat-resistant alloys on the nickel bas used for blades and disks of gas turbine units. For preliminary application of corrosion damage, the specimens were exposed to a corrosive environment at high temperatures. The metal microstructure of the samples before thermal fatigue tests (after accumulation of corrosion damage and production of one polished surface) was studied by digital metallography. Thermal fatigue tests were carried out in vacuum on plane corset specimens. Heating of the axially fixed specimens is performed by passing electric current. The specified cyclic heating/cooling program was maintained automatically during the entire test. Test programs with temperature changes within the cycle in the ranges of 100 ↔ 850, 100 ↔ 900, 100 ↔ 1000°C without delay and 100 ↔ 800, 100 ↔ 900, 100 ↔ 1000, 100 ↔ 1100, 500 ↔ 1000, 500 ↔ 1050°C with delay at the maximum temperature from 2 to 15 min were considered. The performed tests of specimens with corrosion damages of different intensity have shown a significant influence of the corrosion layer and separate delay time at the maximum cycle temperature on the thermal fatigue resistance of materials. A method for taking into account the effect of corrosion damage on thermal fatigue resistance has been developed using a four-term deformation criterion of thermal fatigue failure by taking into account the linear dependence of the criterion parameters on the thickness of the corrosion layer. The proposed method was initially tested on two heat-resistant alloys KhN56KVMTYuB and VZhM4-VI with varying degrees of corrosion damage.

1. Nikitin V. I. Corrosion and protection of gas turbine blades. — Leningrad: Mashinostroenie, 1987. — 272 p. [in Russian].

2. Getsov L. B. Materials and strength of gas turbine parts. Vol. 1. Materials, properties, damage, deformation and fracture models / Altenbach H., Naumenko K., Eds. — Cham: Springer, 2021. — 469 p. DOI: 10.1007/978-981-16-0534-5

3. Naprienko S. A., Filonova E. V., Chabina E. B., Gorlov D. S. Influence of gas environment on the fracture process of locking joints of working blades of land-based gas turbine plants / Probl. Mashinostr. Nadezhn. Mashin. 2021. No. 3. P. 86 – 94 [in Russian].

4. Getsov L. B., Balandina M. Yu., Grishchenko A. I., et al. The Rehbinder effect in tests of superalloys in contact with molten salts / Industr. Lab. Mater. Diagn. 2021. Vol. 87. No. 10. P. 54 – 62 [in Russian]. DOI: 10.26896/1028-6861-2021-87-10-54-62

5. Li Q., Liu F., Li Y., et al. A study of the hot salt corrosion behavior of three nickel-based single-crystal superalloys at 900°C / Crystals. 2024. Vol. 14. No. 4. P. 307. DOI: 10.3390/cryst14040307

6. Cruchley S., Li H. Y., Evans H. E., et al. The role of oxidation damage in fatigue crack initiation of an advanced Ni-based superalloy / Int. J. Fatigue. 2015. Vol. 81. P. 265 – 274. DOI: 10.1016/j.ijfatigue.2015.08.016

7. Mudgal D., Singh S., Prakash S. Cyclic hot corrosion behavior of Superni 718, Superni 600, and Superco 605 in sulfate and chloride containing environment at 900°C / Metallogr. Microstruct. Anal. 2015. Vol. 4. No. 1. P. 13 – 25. DOI: 10.1007/s13632-014-0182-0

8. Cervellon A., Yi J. Z., Corpace F., et al. Creep, fatigue, and oxidation interactions during high and very high cycle fatigue at elevated temperature of nickel-based single crystal superalloys / Superalloys. — Cham: Springer, 2020. P. 18. DOI: 10.1007/978-3-030-51834-9_18

9. Ruiz-Sabariego J. A., Pommier S. Oxidation assisted fatigue crack growth under complex non-isothermal loading conditions in a nickel base superalloy / Int. J. Fatigue. 2009. Vol. 31. Nos. 11 – 12. P. 1724 – 1732. DOI: 10.1016/j.ijfatigue.2009.03.009

10. Tong J., Dalby S., Byrne J., et al. Creep, fatigue and oxidation in crack growth in advanced nickel base superalloys / Int. J. Fatigue. 2001. Vol. 23. No. 10. P. 897 – 902. DOI: 10.1016/s0142-1123(01)00049-4

11. Sotov A. V., Pronichev N. D., Smelov V. G., et al. Development algorithm of the technological process of manufacturing gas turbine parts by selective laser melting / Izv. Samar. NTs RAN. 2017. Vol. 19. No. 4-1. P. 96 – 104 [in Russian].

12. Garibov G. S., Grits N. M., Vostrikov A. V., Fedorenko E. A. Development of a new VV751P high-strength alloy for advanced gas-turbine engines / Tekhnol. Leg. Splavov. 2009. No. 1. P. 34 – 39 [in Russian].

13. Ber L. B. Temperature-time diagrams of γ-solid solution disintegration in pm Ni-based superalloys EP741NP and VV751P, their plotting and usage at quenching of disc blanks / Tekhnol. Leg. Splavov. 2017. No. 4. P. 5 – 19 [in Russian].

14. Petrushin N. V., Ospennikova O. G., Svetlov I. L. Single-crystal Ni-based superalloys for turbine blades of advanced gas turbine engines / Aviats. Mater. Tekhnol. Nauch.-Tekhn. Zh. — Moscow: VIAM, 2017. P. 72 – 102 [in Russian]. DOI: 10.18577/2071-9140-2017-0-s-72-103

15. Belyaev M. S., Petrushin N. V. High-cycle fatigue of single crystals of nickel-base superalloy VZHM / Materialovedenie. 2017. No. 12. P. 10 – 17 [in Russian].

16. Movenko D. A., Zavodov A. V., Laptev A. V., Loshchinina A. O. Changing the single crystal Ni-based superalloy structure during high-temperature salt corrosion at 750°C / Metalloved. Term. Obrab. Met. 2024. No. 5. P. 21 – 28 [in Russian]. DOI: 10.30906/mitom.2024.5.21-28

17. Golubovskii E. R., Volkov M. E. Fatigue of single crystal Ni-based superalloy VZHM-4 and VZHM-5 at elevated temperatures / Aviats. Dvig. 2018. No. 1. P. 51 – 58 [in Russian]. DOI: 10.54349/26586061_2018_1_51

18. Semenova A. A., Grishchenko A. I., Semenov A. S. Influence of the crystallographic orientation of FCC single crystals on plastic strain under uniaxial monotonic and cyclic thermomechanical loading / PNRPU Mech. Bull. 2023. No. 5. P. 81 – 98 [in Russian]. DOI: 10.15593/perm.mech/2023.5.08

19. Getsov L. B., Dobina N. I., Rybnikov A. I., et al. Thermal fatigue resistance of a monocrystalline alloy / Strength Mater. 2008. Vol. 40. No. 5. P. 538 – 551. DOI: 10.1007/s11223-008-9076-1

20. Getsov L. B., Semenov A. S., Golubovsky E. R., et al. Features and uniform description of I, II, and III stages of the creep in single-crystal superalloys / Industr. Lab. Mater. Diagn. 2020. Vol. 86. No. 3. P. 44 – 54 [in Russian]. DOI: 10.26896/1028-6861-2020-86-3-44-54

21. Semenov A. S., Grishchenko A. I., Kolotnikov M. E., Getsov L. B. Finite-element analysis of thermal fatigue of gas turbine blades. Part 2. Results of computations / Vestn. UGATU. 2019. Vol. 23. No. 2(84). P. 61 – 74 [in Russian].

22. Getsov L. B., Rybnikov A. I., Semenov A. S. Thermal fatigue strength of heat-resistant alloys / Thermal Engineering. 2009. Vol. 56. No. 5. P. 412 – 420. DOI: 10.1134/s0040601509050103

23. Getsov L. B., Laptev A. B., Puzanov A. I., Shelyapina N. M. Sulfide oxide corrosion of modern heat-resistant alloys / Russ. Aeronautics. 2019. Vol. 62. No. 4. P. 689 – 695. DOI: 10.3103/s1068799819040214

24. Semenov A. S., Getsov L. B. Thermal fatigue fracture criteria of single crystal heat-resistant alloys and methods for identification of their parameters / Strength Mater. 2014. Vol. 46. No. 1. P. 38 – 48. DOI: 10.1007/s11223-014-9513-2

25. Getsov L. B., Semenov A. S. On the safety margins of gas turbine engine parts under thermal cyclic loading / Aviats. Dvig. 2023. Vol. 18. No. 1. P. 79 – 98 [in Russian]. DOI: 10.54349/26586061_2023_1_79

26. Semenov A. S., Grishchenko A. I., Kolotnikov M. E., Getsov L. B. Finite element analysis of thermal cyclic strength of gas turbine blades. Part 1: Material models, failure criteria, parameter identification / Vestn. UGATU. 2019. Vol. 23. No. 1(83). P. 70 – 81 [in Russian].

27. Gao T., Jing J., Chen C., et al. A practical nonlinear damage accumulation method to predict the life and crack propagation of blade subjected to multilevel cyclic fatigue loads / J. Strain Anal. Eng. Design. 2020. Vol. 55. Nos. 3 – 4. P. 86 – 98. DOI: 10.1177/0309324719900598

28. Getsov L. B., Semenov A. S., Besschetnov V. A., et al. Long-term strength determination for cooled blades made of monocrystalline superalloys / Thermal Eng. 2017. Vol. 64. No. 4. P. 280 – 287. DOI: 10.1134/s0040601517040048

29. Semenov A. S., Semenov S. G., Getsov L. B. Methods of Computational determination of growth rates of fatigue, creep, and thermal fatigue cracks in poly- and monocrystalline blades of gas turbine units / Strength Mater. 2015. Vol. 47. No. 2. P. 268 – 290. DOI: 10.1007/s11223-015-9657-8

30. Getsov L. B., Mikhailov V. E., Semenov A. S., et al. Numerical determination of the service life of rotor and stator blades of gas turbine plants. Part 2. Single-crystal materials / Gazoturb. Tekhnol. 2011. No. 8(101). P. 18 – 25 [in Russian].

31. Getsov L. B., Semenov A. S., Ignatovich I. A. Thermal fatigue analysis of turbine discs on the base of deformation criterion / Int. J. Fatigue. 2017. Vol. 97. P. 88 – 97. DOI: 10.1016/j.ijfatigue.2016.12.018

32. Shanyavskiy A. A. Fatigue crack propagation in turbine disks of EI698 superalloy / Frattura ed Integrita Strutturale. 2013. Vol. 24. P. 13 – 25. DOI: 10.3221/igf-esis.24.03

33. Choi H., Lim H. J., Yun G. J. An integrated unified elasto-viscoplastic fatigue and creep damage model with characterization method for structural analysis of nickel-based high-temperature structure / Int. J. Damage Mech. 2023. Vol. 32. No. 1. P. 73 – 102. DOI: 10.1177/10567895221124324