High Temperature Oxidation and Hot Corrosion Behaviour of 9Cr 1Mo Ferritic Cold Rolled Steel in Air at 900°C under Cyclic Condition

Amarish K. Shukla, Dinesh Gond, M. Bharadwaj, D. Puri

HEEP, Bharat Heavy Electricals Limited, Haridwar.(Government Of India Undertaking), India.
Metallurgical & Materials Engineering Department, Indian Institute of Technology Roorkee,India.

DOI: 10.4236/jmmce.2011.1011081                

Abstract

The oxidation behaviour of 10%, 30%, and 50% cold rolled and unprocessed 9Cr 1Mo ferritic steels in air have been studied under isothermal conditions at a temperature of 900°C in a cyclic manner. Oxidation kinetics was established for all samples on which experiment was conducted in air at 900°C under cyclic conditions for 50 cycles by thermogravimetric technique. Each cycle consisted of 1 hour heating at 900°C followed by 20 min of cooling in air. 10% cold rolled sample followed parabolic rate of oxidation while 30% cold rolled sample showed accelerated rate of weight gain. X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray (SEM/EDAX) techniques were used to characterise the oxidized sample and their scales. 10% cold rolled steel was found to be more corrosion resistance than other in air oxidation for 50 cycles.

Keywords

Hot corrosion; cold rolling; cyclic oxidation.

Conflicts of Interest

The authors declare no conflicts of interest.

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