Mechanical Study of a Chrome-Molybdenum Steel with Hard Coating
DOI:
https://doi.org/10.46842/ipn.cien.v25n1a10Keywords:
adherence, boriding, delaminationAbstract
The thermochemical treatment of boron is evaluated at temperatures of 950 and 1000°C, with an exposure time of 2 and 0.5 h; the adhesion of the layer is analyzed using the Rockwell C technique by the German VDI 3198 standard and a qualitative classification is obtained. By optical microscopy the growth and morphology of the FeB/Fe₂B layer on the surface of the material is observed; the presence of FeB/Fe₂B phases was determined by X-ray diffraction (XRD). The scanning electron microscopy (SEM) technique shows the distribution of the alloy elements in the substrate FeB / Fe₂B layer formed on the surface of the medium carbon steel. The elastic modulus and hardness obtained with nanoindentation tests on the generated two-phase layer. The aim of this research is to characterize the morphology, adhesive and mechanical behavior of the boride coating formed on an AISI 4140 steel by means of the dehydrated paste technique, with low diffusion times that prevent the formation of too much of the fragile FeB phase.
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