Home Metallic Materials - Kovové materiály 2015 Metallic Materials Vol. 53 (2015), no. 6, pp.443-450

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Metallic Materials Vol. 53 (2015), no. 6, pp.443-450

Title: Application of plasma nitriding on low-alloy (50CrV4+QT) steel in order to improve its fatigue resistance
Author: M. KUFFOVA, P. ČELKO

Abstract: The presented work is focused on the fatigue endurance improvement by using plasma nitriding. In this research the microstructure and fatigue properties of low-alloyed steel 50CrV4+QT were evaluated. The low-alloyed (manganese-chromium-vanadium) steel is commonly used after heat treatment – quenching and tempering – QT(.7). This steel is widely used for highly loaded machines and parts of road vehicles: crankshafts of diesel engines, shafts of driving gears, connecting shafts, pins, springs, axle shafts and piston rods. Steel is suitable for quenching and tempering and contains chemical elements which predetermine it to the chemical-thermal treatment: plasma nitriding. The fatigue limit was determined at the rotating beam fatigue. The fatigue limit improvement at 1 × 107 cycles was 44 %. Explanation of the improvement is based on stabilized gradient of properties in treated layer.

Keywords: plasma nitriding, low-alloy steel 50CrV4, rotating beam fatigue tests, fatigue endurance
Published online: 25-Jan-2016
Year: 2015, Volume: 53, Issue: 6 Page From: 443, Page To: 450
doi:10.4149/km_2015_6_443


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