Jawhar, M., Abbass, M., Aziz, I., Khoshnaw, F. (2023). Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles. Alustath, 41(6), 860-869. doi: 10.30684/etj.2023.137494.1351
Mustafa N. Jawhar; Muna K. Abbass; Israa A. Aziz; Fuad Khoshnaw. "Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles". Alustath, 41, 6, 2023, 860-869. doi: 10.30684/etj.2023.137494.1351
Jawhar, M., Abbass, M., Aziz, I., Khoshnaw, F. (2023). 'Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles', Alustath, 41(6), pp. 860-869. doi: 10.30684/etj.2023.137494.1351
Jawhar, M., Abbass, M., Aziz, I., Khoshnaw, F. Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles. Alustath, 2023; 41(6): 860-869. doi: 10.30684/etj.2023.137494.1351

Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles

Engineering and Technology Journal
Volume 41, Issue 6, June 2023, Pages 860-869    PDF (1.59 M)
Document Type: Research Paper
DOI: 10.30684/etj.2023.137494.1351
Authors
Mustafa N. Jawhar* 1; Muna K. Abbass1; Israa A. Aziz1; Fuad Khoshnaw2
1Production Engineering and Metallurgy Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
2School 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.

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
Pack cementation; Ni-based superalloy; NanoY2O3-ZrO2 particle; Aluminide coating; Oxidation resistance
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