Document Type : Research Paper

Authors

1 Production Engineering and Metallurgy Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

2 School of Engineering and Sustainable Development, De Montfort University, United Kingdom

Abstract

The pack cementation process was used to create a type of Y2O3+ZrO2 doped Cr-Co-modified aluminide coating that takes advantage of the synergistic effects of nano Y2O3 and ZrO2 particles. A Ni-based superalloy (type IN625 type) was coated with pack powder containing: Al as a source of aluminum; Cr as a source of chromium, Co as a source of cobalt, NH4Cl as a source of activator; nano Y2O3-ZrO2 as a source of reactive element oxide; and Al2O3 as a source of filler metal. The process was carried out for 6 hours at 1100oC temperature. The microstructure characterization of the coating was performed by SEM, EDS, and XRD. It was found that the cross-section of the coating obtained was uniform and free from cracking. The maximum hardness value was found at the outer layer (997H.V.) and decreased toward the core sample core (366H.V.). The coating's microstructure consists of an outer layer, a transition layer, and an IDZ. The average coating thickness is 132.37, 36.11, and 37.65µm for the outer layer, transition layer, and IDZ, respectively. The XRD analysis of the coating system after 6 hours at 1100oC revealed phases formed by AlNi3, CoO, Al-Cr-Co, and Cr4NiZr. The n (growth rate time constant) and Kp (parabolic rate constant) values increase with increased oxidation temperature. It was found that adding Zr and Y to the Cr-Co-modified aluminide coating might increase the oxidation resistance.

Graphical Abstract

Highlights

  • Nano Y2O3 and ZrO2 particles were used in diffusion coating by the single-step pack cementation process
  • Effects of Y2O3 and ZrO2 on mechanical properties and oxidation resistance of coated Inconel 625 superalloy were analyzed
  • Microstructure of coated IN625 superalloy consists of an outer layer, a transition layer, and an interdiffusion zone
  • Adding Y2O3 and ZrO2 to the Cr-Co-modified aluminide coating might increase the oxidation resistance

Keywords

Main Subjects

  1. Lee, M .Terner, E .Copin, P. Lours, H.U. Hong, A novel approach to the production of NiCrAlY bond coat onto IN625 superalloy by selective laser melting, Addit. Manuf., 31 (2020) 100998. https://doi.org/10.1016/j.addma.2019.100998
  2. Visuttipitukul, N. Limvanutpon2 and P. Wangyao, Aluminizing of Nickel-Based Superalloys Grade IN 738 by Powder Liquid Coating, Mater. Trans., 51 (2010) 982 - 987. https://doi.org/10.2320/matertrans.M2009382
  3. Galiullin, A. Chyrkin, R. Pillai, R. Vaßen and W.J. Quadakkers, Effect of alloying elements in Ni-base substrate material on interdiffusion processes in MCrAlY-coated systems, Surf. Coat. Technol., (2018). https://doi.org/10.1016/j.surfcoat.2018.07.020
  4. A. Pint, J.A. Haynes, and T.M. Besmann, Effect of Hf and Y alloy additions on aluminide coating performance, Surf. Coat. Technol., 204 (2010) 3287–3293. https://doi.org/10.1016/j.surfcoat.2010.03.040
  5. Basuki, F. Mohammad, A. Fauzi and D. Prajitno, Hot Corrosion of Aluminide Coated Ti-Al-Cr-Nb-Zr-Y Intermetallic Alloys, Adv.Mater. Res., 1112 (2015) 363-366. https://doi.org/10.4028/www.scientific.net/AMR.1112.363
  6. R. Khajavi Mr Khajavi and Mr Pasha, Aluminide Coatings for Nickel Based Superalloys, Surf. Eng., 20 (2013) 261-265. https://doi.org/10.1179/026708404X4672
  7. Visuttipitukul, N. Limvanutpong, P. Wangyao, Aluminizing of Nickel-Based Superalloys Grade IN 738 by Powder Liquid Coating, Mater. Trans., 51 (2010) 982 to 987. https://doi.org/10.2320/matertrans.M2009382
  8. Panpan, S. Xiaoyong, H. Linli, Y. Tao, F. Yuqing, Research Progress of Pt-modified Aluminide Coating on Nickel-base Superalloys J. Chin. Soc. Corros. Prot., 42 (2022) 186-192. https://doi.org/10.1016/S0257-8972(03)00871-5
  9. Zielinska, J. Sieniawski, M. Zagula-Yavorska , M. Motyka, Influence of Chemical Composition of Nickel Based Superalloy on the Formation of Aluminide Coatings, Arch. Metall. Mater., 56 (2011) 193-197. https://doi.org/10.4028/www.scientific.net/SSP.227.365
  10. Scendo, K. S.Samson and H. Danielewski, Corrosion Behavior of Inconel 625 Coating Produced by Laser Cladding, Coatings, 11( 2021). https://doi.org/10.3390/coatings11070759
  11. Zhu, Y. X. Zhang, J. F. Wang , L.M. Luo, High-Performance Al–Si Coatings Toward Enhancing Oxidation Resistance of Tungsten by Halide-Activated Pack Cementation, Front. Mater., 2020. https://doi.org/10.3389/fmats.2020.00136
  12. Bozza, F., Bolelli, G., Giolli, C., Giorgetti, A., Lusvarghi, L., Sassatelli, Diffusion mechanisms and microstructure development in pack aluminizing of Ni-based alloys, Surf. Coat. Technol., 239 (2014) 147–159. https://doi.org/10.1016/j.surfcoat.2013.11.034
  13. Cheng, J. C., Yi, S. H., Park J. S., Simultaneous coating of Si and B on Nb-Si-B alloys by a halide activated pack cementation method and oxidation behaviors of the alloys with coatings at 1100oC, J. Alloy Compd., 644 (2015) 975–981. https://doi.org/10.1016/j.jallcom.2015.05.003
  14. B. Gatea M. k. Abbass, Effect of Pack Cementation Coating on Hot Corrosion Resistance of Low Alloy Steel, Eng. Technol., 27 (2009) 332-346.
  15. N .Chaia, C Cossu, L.M. Ferreira, C.J .Parrisch, J.D. Cotton, Protective aluminide coating by pack cementation for Beta 21-S titanium alloy, Corros. Sci., 160 (2019) https://doi.org/10.1016/j.corsci.2019.108165
  16. Moosa, J. Karim and A. Hoobi, Oxidation Properties in CO2 of Inconel Alloy 600 Coated by Simultaneous Aluminizing-Chromizing Process, Chinese J. Aeronaut., 20 (2007) 134-139. https://doi.org/10.1016/S1000-9361(07)60020-X
  17. Moosa , H. Al-Alqawie, Oxidation of Sinple and Pt- Modificd Diffusion Coating on Inconel Alloy 600 in Air, Eng. Technol., 24 (2005) 909-917. https://doi.org/10.13140/RG.2.1.2665.3203
  18. A. Alkadir,M. N. Jawhar, Improvement of Oxidation Resistance of Inconel 600 Alloy by Pack Cementation Process, Adv.Technol., 9 (20187). https://doi.org/10.4172/0976-4860.1000208
  19. Zhang, J. Sun ,Y. Zhou, Cyclic oxidation and hot corrosion of Al2O3-Y2O3 dispersed low temperature chromising coating, Trans. Nonferrous Met. Soc. China, 23 (2013) 2923-2928. https://doi.org/10.1016/S1003-6326(13)62815-0
  20. Leng, R. Pillai, P. Huczkowski, D. Naumenko , W.J. Quadakkers, Microstructural evolution of an aluminide coating on alloy 625 during wet air exposure at 900°C and 1000°C, Surf. Coat. Technol., 354 (2018) 268–280. https://doi.org/10.1016/j.surfcoat.2018.09.043
  21. N. jawhar, I. A. Aziz,M. K. Abbass, Synthesis and Characterizations of Modified Y2O3 Nanoparticles Aluminide Coating on Nickel Alloy IN625, AIP Conf. Proc., 2660 (2022) 020118. https://doi.org/10.1063/5.0107713
  22. K. Tolpygo, K.S. Murphy and D.R. Clarke, Effect of Hf, Y and C in the underlying superalloy on the rumpling of diffusion aluminide coatings, Acta Mater., 56 (2008) 489–499. https://doi.org/10.1016/j.actamat.2007.10.006
  23. Zhan,Y. He, Li Li , H. Liu ,Y. Dai, Low-temperature formation and oxidation resistance of ultrafine aluminide coatings on Ni-base superalloy, Surf. Coat. Technol., 203 (2009) 2337–2342. https://doi.org/10.1016/j.surfcoat.2009.02.127
  24. Fan, H. Yu , T. Wang, Z. Wu ,Y. Liu, Preparation and Isothermal Oxidation Behavior of Zr-Doped, Pt-Modified Aluminide Coating Prepared by a Hybrid Process, Coatings, 8 (2018) 1-12. https://doi.org/10.3390/coatings8010001