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

Abstract:

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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

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Price:

$35.00

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