Microstructural and micromechanical characterizations of the growing nitrided layer of 30CrMo12 steel

Abstract

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.