Hot Dip Aluminizing of 9Cr-1Mo Steels and their Heat Treatment

Abstract:

Article Preview

Coupons of 9Cr-1Mo steels of type SA 387 Grade 9 class 2 were hot dip aluminized using Al bath at a temperature of 700 °C for 30 seconds. The samples were further heat treated at 750 °C for durations of 1, 3 and 5 hours, respectively. The samples were characterized using X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy. The investigation showed that as coated samples contain an aluminum top coat, a reaction layer and substrate material. Within the reaction layer, two distinct regions corresponding to Fe2Al5 and Fe4Al13 were identified. Chromium up to 2 at% was observed. After heat treatment Al coat was not existing. Two distinct layers, corresponding to a thick Fe2Al5 and a thin FeAl were observed at shorter heat treatment duration. Under longer heat treatment durations, multiple phases, namely, Fe2Al5, FeAl, Fe3Al and solid solution of Al in Fe were observed.

Info:

Periodical:

Materials Science Forum (Volumes 830-831)

Edited by:

P. Ramesh Narayanan and S.V.S. Narayana Murty

Pages:

143-146

DOI:

10.4028/www.scientific.net/MSF.830-831.143

Citation:

J. Patel et al., "Hot Dip Aluminizing of 9Cr-1Mo Steels and their Heat Treatment", Materials Science Forum, Vols. 830-831, pp. 143-146, 2015

Online since:

September 2015

Export:

Price:

$35.00

* - Corresponding Author

[1] W. Yan, W. Wang, Y. –Y. Shan, K. Yang, Microstructural stability of 9-12% Cr ferrite/ martensite heat resistant steels, Front. Mater. Sci. 7(1) (2013) 1-27.

DOI: 10.1007/s11706-013-0189-5

[2] Annexure I of FCIPT/TBM-A1/Reports/01 (Facilitation Centre for Industrial Plasma technologies for Test Blanket Module) Rev 00 (2008) 1-18.

[3] H.R. Shahverdi, M.R. Ghomashchi, S. Shabestari, J. Hejazi, Microstructural analysis of interfacial reaction between molten aluminum and solid iron, J. Mater. Process. Tech. 124 (2002) 345-352.

DOI: 10.1016/s0924-0136(02)00225-x

[4] Y. -Y. Chang, W. -J. Cheng, C. -J. Wang, Growth and surface morphology of hot dip Al-Si on 9Cr-1Mo steel, Mater. Character. 60 (2009) 144-149.

DOI: 10.1016/j.matchar.2008.08.003

[5] M. Emami, H.R. Shahverdi, S. Hayashi, M.J. Torkamany, A combined hot dip aluminized/Laser alloying treatment to produce Iron-rich aluminides on alloy steel, Met. Matls. Trans. A, 44A (2013) 3176-3184.

DOI: 10.1007/s11661-013-1666-2

[6] M. -B. Lin, C. -J. Wang, A.A. Volinsky, Isothermal and thermal cycling oxidation of hot dip aluminide coating on flake/spheroidal graphite cast iron, Sur. and Coat. Technol. 206 (2011) 1595-1599.

DOI: 10.1016/j.surfcoat.2011.06.010

[7] S.C. Deevi, V.K. Sikka, C.T. Liu, Processing, properties, and applications of nickel and iron aluminides, Prog. Mater. Sci. 42 (1997) 177-192.

[8] C.G. Mackamey, J.A. Horton, C.T. Liu, Effect of alloying on aqueous corrosion and mechanical behavior of iron aluminide, J Mater Sci., 31, 1996, 5207-5213.

In order to see related information, you need to Login.