KUTU SEMENTASYON YÖNTEMİ İLE ÜRETİLEN MONEL 400 ALAŞIMININ ÜZERİNE DÜŞÜK SICAKLIK ALUMİNYUMLAMA ETKİSİ

Year 2023, , 89 - 93, 31.12.2023

Alperen Refik Bilal Özsarı , Feyza Selamet , Tuba Yener

https://doi.org/10.22531/muglajsci.1310224

Abstract

Bu çalışmada, Monel400 alaşım üzerinde 600°C sıcaklıkta, 2, 4 ve 6 saatlik süreler boyunca düşük sıcaklıkta kutu sementasyon yöntemi ile alüminyum kaplama işlemi gerçekleştirilmiştir. Pota karışımı; alüminyum kaynağı olarak metalik Al tozu, inert dolgu olarak Al2O3 ve aktivatör olarak Amonyum Klorür (NH4Cl) kullanılarak hazırlanmıştır. Oluşan kaplamaların mikro yapıları SEM ve EDS analizleri ile karakterize edilmiş, XRD analizi ile faz analizleri gerçekleştirilmiştir. SEM analizi, kaplama tabakalarının homojen, kompakt ve gözeneksiz olduğunu ve kaplama ile matris arasında sağlam bir yapışma olduğunu ortaya koymuştur. Kaplama tabakasının kalınlığı yüzeyden matrise doğru ölçülmüş ve değerlerin 4 µm ile 10 µm arasında değiştiği gözlenmiştir. 600°C'nin alüminid tabakasının birikmesi için yeterli olduğu ve başarılı bir kaplama tabakasının elde edildiği tespit edilmiştir. Yüzeyde oluşturulan aluminit tabakasının sertlik değerleri ölçülmüş ve artan işlem süresi ve sıcaklıkla birlikte sertlik değerlerinde artış gözlenmiştir.

Keywords

Monel 400 alaşımı, Kutu sementasyonu, Süper alaşım, Alüminyumlama

LOW TEMPERATURE ALUMINIZATION EFFECT ON MONEL 400 ALLOY PRODUCED BY PACK CEMENTATION METHOD

Abstract

In this study, aluminum coating process was performed on Monel 400 alloy at a temperature of 600°C using the low-temperature pack cementation method for durations of 2, 4, and 6 hours. The mixture for the coating consisted of metallic Al powder as the aluminum source, Al2O3 as the inert filler, and Ammonium Chloride (NH4Cl) as the activator. The formed coatings were characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses to examine their microstructures, and phase analyses were conducted using and X-Ray Difraction Analyses (XRD). SEM analysis revealed that the coating layers were homogeneous, compact, and pore-free, demonstrating a strong bond between the coating and the matrix. The thickness of the coating layer was measured from the surface to the matrix, and it was observed to vary between 4 µm and 10 µm. It was determined that 600°C was sufficient for the accumulation of an aluminide layer and a successful coating layer was obtained. The hardness values of the alumina layer formed on the surface were measured, and an increase in hardness values was observed with increasing process duration and temperature.

Keywords

Monel 400 alloy, Pack cementation, Super alloy, Aluminide-based coating

References

• A. Erdogan, T. Yener, K. M. Doleker, M. E. Korkmaz, and M. S. Gök, “Low-temperature aluminizing influence on degradation of nimonic 80A surface: Microstructure, wear and high temperature oxidation behaviors,” Surfaces and Interfaces, vol. 25, no. December 2020, 2021.
• S. Rangarajan, S. Bera, and S. V. Narasimhan, “Electrochemical and surface analytical study of the formation of oxide films on monel-400 and copper in alkaline media,” Journal of Solid State Electrochemistry, vol. 2, no. 2, pp. 94–98, 1998.
• R. Darolia, “Development of strong, oxidation and corrosion resistant nickel-based superalloys: critical review of challenges, progress and prospects,” https://doi.org/10.1080/09506608.2018.1516713, vol. 64, no. 6, pp. 355–380, Aug. 2018.
• F. Bozza et al., “Diffusion mechanisms and microstructure development in pack aluminizing of Ni-based alloys,” 2013.
• F. Bozza et al., “Diffusion mechanisms and microstructure development in pack aluminizing of Ni-based alloys,” Surface and Coatings Technology, vol. 239, pp. 147–159, Jan. 2014.
• D. Kourtidou et al., “Deposition of Ni-Al coatings by pack cementation and corrosion resistance in high temperature and marine environments,” 2018.
• D. Kourtidou et al., “Deposition of Ni-Al coatings by pack cementation and corrosion resistance in high temperature and marine environments,” Corrosion Science, vol. 148, pp. 12–23, Mar. 2019.
• A. K. Parida and K. Maity, “Comparison the machinability of Inconel 718, Inconel 625 and Monel 400 in hot turning operation,” Engineering Science and Technology, an International Journal, vol. 21, no. 3, pp. 364–370, 2018.
• Y. Zhu, J. Wang, H. Liu, P. Ren, and F. Yan, “The tribocorrosion behavior of Monel 400 alloy in seawater at different temperatures,” Tribology International, vol. 189, p. 108975, Nov. 2023.
• K. Samvatsar and V. Rao, “Feasibility study for the development of Al-Si based coating on Ni-Cu alloy (UNS N04400),” Materials Today: Proceedings, vol. 64, pp. 395–401, Jan. 2022.
• K. Devendranath Ramkumar, N. Arivazhagan, and S. Narayanan, “Effect of filler materials on the performance of gas tungsten arc welded AISI 304 and Monel 400,” Materials and Design, vol. 40, pp. 70–79, 2012.
• Y. Küçük, K. M. Döleker, M. S. Gök, S. Dal, Y. Altınay, and A. Erdoğan, “Microstructure, hardness and high temperature wear characteristics of boronized Monel 400,” Surface and Coatings Technology, vol. 436, no. February, 2022.
• M. Kukliński, A. Bartkowska, and D. Przestacki, “Investigation of laser heat treated Monel 400,” MATEC Web of Conferences, vol. 219, pp. 1–8, 2018.
• T. Yener, A. Erdogan, M. S. Gök, and S. Zeytin, “Formation, characterization, and wear behavior of aluminide coating on mirrax® ESR steel by low-temperature aluminizing process,” Journal of Tribology, vol. 143, no. 1, 2021.
• T. Yener, K. Mert, A. Erdogan, M. Oge, and Y. Er, “Surface & Coatings Technology Wear and oxidation performances of low temperature aluminized IN600,” Surface & Coatings Technology, vol. 436, no. February, p. 128295, 2022.
• K. M. Döleker et al., “Enhancing the wear and oxidation behaviors of the Inconel 718 by low temperature aluminizing,” Surface and Coatings Technology, vol. 412, no. December 2020, 2021.
• T. Yener, “Chromium-Aluminide Coatings via Pack Cementation Method on Inconel 718 Alloy and Fe-Cr-Ni SuperAlloy,” Sakarya University Journal of Science, vol. 23, no. 44066, pp. 817–823, 2019.
• “Special Metals - Home.” [Online]. Available: https://www.specialmetals.com/. [Accessed: 20-Aug-2023].
• T. Yener, “Low temperature aluminising of Fe-Cr-Ni super alloy by pack cementation,” Vacuum, vol. 162, 2019.