The Effect of Long-Term Annealing on Microstructure of Aluminide Coatings Deposited on MAR M200 Superalloy by CVD Method

Abstract:

The paper presents the influence of long-term heat treatment on aluminide coating. The MAR M-200 nickel superalloy was use as base material. The aluminide coating was deposited in low-activity chemical vapour deposition process using Ion Bond BPX Pro 325s device with following parameters: temperature 1040°C, time 12 hours, pressure 150 mbar. The samples (14 mm diameter) were annealed at 1020°C in vacuum for 12, 16 and 20 hours respectively. The XRD phase analysis and SEM microstructural observation with EDS analysis were conducted. The phase composition analysis showed that after deposition the NiAl phase is a main component of the coating. After the 20-hour-long annealing presence of Ni₃Al phase in the coating was observed. Changes in structure of coatings and Al content during heat treatment were detected as well. The maximum duration of heat treatment performed for Ni superalloy with aluminide coating without significant changes in coating phase composition and microstructure is 16 hours.

• Periodical: Key Engineering Materials (Volumes 592-593)
• Pages: 477-480
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.592-593.477
• Online since: November 2013
• Authors: Andrzej Nowotnik, Jan Sieniawski, Marcin Zawadzki, Marek Goral*
• Keywords: Aluminide Coatings, CVD, Heat Treatment

References

[1] G.W. Goward Surface and Coatings Technology 108-109 (1998) pp.73-79.

[2] M.J. Pomeroy, Materials and Design 26 (2005) pp.223-231.

[3] G.W. Goward, D.H. Boone, Oxidation of Metals, Vol. 3, No. 5, (1971).

[4] Squillace, R. Bonetti, N.J. Archer, J.A. Yeatman , Surface and Coatings Technology 120-121 (1999) pp.118-123.

DOI: 10.1016/s0257-8972(99)00347-3

[5] Wen-Pin Sun, H.J. Lin, Min-Hsiung Hon , Metallurgical and Materials Transactions A, Vol. 17, No. 2, pp.215-220.

[6] B.M. Warnes, A.L. Purvis, D.L. Near, United States Patent No. US 6, 793, 966 B2, (Sep. 21, 2004).

[7] B.M. Warnes, D.C. Punola, Surface and Coatings Technology 94-95 (1997) pp.1-6.

[8] M. Mojaddami, S. Rastegari, H. Arabi, H. Rafiee, Surface Engineering, Volume 28, Issue 10, November 2012, Pp. 772-777.

DOI: 10.1179/1743294412y.0000000064

[9] F.H. Latief, K. Kakehi, Materials and Design, Vol. 52, December 2013, Pp. 134-142.

[10] R. Sitek, H. Matysiak, J. Ferenc, K. J Kurzydłowski, Materials Science Forum, Vol. 636-637, 2010, Pp. 1011-1018.

DOI: 10.4028/www.scientific.net/msf.636-637.1011

[11] A. Nowotnik, M. Goral, M. Pytel, K. Dychton, Diffusion and Defect Data Pt. B: Solid State Phenomena, Vol. 197, 2013, Pp 95-100.