Abstract
An experimental investigation of an influence of different composition and microstructure of both thin compound and case layers, obtained as a result of plasma nitriding with different parameters, on contact and bending fatigue properties of a nitriding steel was conducted separately with the aid of contact fatigue tests of gears models and tests of individual teeth in bending. Contact fatigue properties at loads close to fatigue limit did not depend on the type of phases contained in the layer. Values of microhardness of case layers were in a good correlation with the total volume content of particles. Fatigue limit in bending decreased with the higher content of particles, unlike limited fatigue life at loads 10 % above the fatigue limit, which increased with the particles content. Contact damage mechanism at near-fatigue-limit load, pitting, differed from that at higher loads spalling.
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