Abstract
This study aims to explore the very high cycle fatigue performance of GCr15 bearing steel produced by two different melting routes by ultrasonic fatigue testing. The results show that the fatigue strength of the steel fabricated by continuous casting is still slightly lower (∼4%) than that of the steel by electroslag remelting route mainly due to the difference of their inclusion characteristics. The nitride is more detrimental to fatigue performance mainly due to its internal cracking mode and lower threshold value for granular bright facet formation. Compared with other GCr15 steels in literature, the tested steels exhibit excellent fatigue performance.
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