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Abstract The research on the high cycle mechanical fatigue test of GCr15 bearing steel under vacuum degassing and electroslage remelting processes was studied. It was observed that under the condition of 107 times fatigue life，the bending fatigue strength of ESR bearing steel was 1 085 MPa，which was higher than that of vacuum degassing steel（1 000 MPa）. The fatigue fracture surface was characterized and analyzed by scanning electron microscope. The size of the inclusions derived from the electroslag process was 3.4-25.6 μm，while that of the vacuum degassing process was 13.3-71.9 μm. It is demonstrated that the size of large particle inclusions（DS） and their distribution are the key factors affecting the fatigue strength and life of bearing steels by studying the relationship between the characteristics of entire fatigue process，such as crack initiation core inclusions，the crack expanding fish-eye，the instantaneous fracture zone and the fatigue strength and the life of spin bending fatigue fracture. It was pointed out that reducing the size of large particle inclusions in bearing steel，controlling its distribution and increasing crack tolerance were still the development direction of metallurgical control of high-end bearing steel in the future.
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Received: 27 March 2018
Published: 20 November 2018
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2018, Vol. 53 
