Abstract
Fatigue lifetime of 14 109 bearing steel in a high-cycle region in tension-compression has been studied experimentally. The aim was to determine the SN curve including fatigue limit, to perform fractographic observation and to analyze crack initiation sites, to discuss the large scatter of lifetime data, which is inherent to high strength steels, and to check the empirical area method to predict fatigue limit for this type of steel.
Highlights
Bearings are important machine parts, which have to sustain an extremely high number of loading cycles during their lifetime
Structural steel 14 109, which has frequently been used for bearing bodies, balls and cylindrical roller bearings, fulfills these requirements
This steel is an equivalent of the European 100Cr steel, US E52100 through-hardening steel or Japanese SUJ2 and SUJ4 steels
Summary
Bearings are important machine parts, which have to sustain an extremely high number of loading cycles during their lifetime. Structural steel 14 109, which has frequently been used for bearing bodies, balls and cylindrical roller bearings, fulfills these requirements. This steel is an equivalent of the European 100Cr steel, US E52100 through-hardening steel or Japanese SUJ2 and SUJ4 steels. The characteristic feature is higher content of C and Cr, which is an important prerequisite for superior mechanical properties. In spite of the fact that this steel belongs to the group of common structural steels, it still attracts research attention from the point of view of the relation among microstructure, mechanical properties and machining technology [1]
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