Effect of the annealing temperature and the thickness of carburizing layer on the obtained chromium carbides

Year 2016, Volume: 2 Issue: 2, 28 - 32, 30.12.2016

Rabah Boubaaya Younes Benarıoua Omar Allaouı

Abstract

Low carbon steel substrates were surface
hardened by carburizing in solid medium, and then thin layers of chromium were
deposited by electrolytic way. After chromium deposition, the samples were
exposed to isothermal annealing at temperatures between 500 and 1100 °C for 1
and 2 hours duration. The obtained thin layers were characterized by X-rays
diffraction, optical microscopy and Vickers micro-hardness.

The obtained results showed that chromium layers
are transformed into chromium carbide by metastable phases of transition. At
500 °C annealing temperature thin films retain their monophasic character Crα,
and they almost keep the same hardness values. When temperature range is
between 700 and 900 °C the incipient phase appears and is increased while the
chromium mother phases decrease. After annealing at 1100 °C, the chromium layer
is completely converted into chromium carbides that would be responsible for
the increase of the hardness and adhesion layer / substrate.

Keywords

Diffusion Precipitation

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