Funct. Mater. 2021; 28 1: 76-83.

doi:https://doi.org/10.15407/fm28.01.76

Establishment of structure and operational properties of borated layers on 40X steel obtained from paste by induction heating

S.Knyazev1, O.Rebrova1, V.Riumin2, V.Nikichanov2, A.Rebrova1

1National Technical University Kharkiv Polytechnic Institute, 2 Kirpicheva Str., 61002 Kharkiv, Ukraine 2Kharkiv National University of Civil Engineering and Architecture, 40 Sumskaya Str., 61002 Kharkiv, Ukraine

Abstract: 

Structural studies of borated layers on 40X steel obtained from pastes using high-speed heating (~ 500-1000°C/s) by high-frequency currents are presented. The structural features of the layer formed under conditions of high-speed heating are revealed. Some morphological differences between the layers obtained with high-speed heating were revealed. Fe2B borides obtained by heating to 1300°C at a rate of 500°C/s have a rounded shape and are included in the matrix structure of the eutectic. Fe2B borides obtained by heating to 1150°C at a rate of 950°C/s, have a regular shape with straight edges. In both cases, the matrix structure of the borated layer has a cellular morphology, which indicates the mechanism of intergranular diffusion. The elemental composition of the diffusion layer has been established. According to the results of testing the samples by erosion-abrasive wear, the most resistant of the considered borated layers is the layer obtained by high-speed heating at 1150°C with the highest ductility resource.

Keywords: 
borating, borides, intergranular diffusion, microhardness, high frequency currents.
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