Résumé:
The need to extend the service life of mechanical
parts at a reduced cost has led to the use of thermochemical
treatment to ensure surface properties with good core ductility
of the treated parts. The objective of this study is to
characterize the microstructure and micromechanics of the
growing nitrided layer of 30CrMo12 steel frequently used in
aeronautical construction. An experimental study on nitriding
was conducted in which the steel used underwent a
thermochemical nitriding treatment. The treated samples were
characterized by optical microscopy, scanning electron
microscopy, X-ray diffraction, and microhardness tests. The
characterization results showed a considerable improvement in
the surface properties (maximum hardness of 1119 HV and
wear resistance) of the treated samples. The thermochemical
nitriding treatment technique has the power to achieve a
nitrided layer of maximum thickness, which increases the
resistance to wear and friction as well as mechanical fatigue.
