Characterization of inclusions in GCr15 bearing steel by ASPEX and rotary bending fatigue methods
SHI Zhi-yue1， XU Hai-feng1， XU Da1， YU Feng1， WANG Chang2， CAO Wen-quan1
（1. Institute of Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China；
2. Center Laboratory， Central Iron and Steel Research Institute， Beijing 100081， China）
Abstract：In order to explore the best application conditions of those two methods and understand the information of inclusions in bearing steel the ASPEX test and rotating-bending fatigue test of GCr15 bearing steel under vacuum degassing process was investigated. The information of the inclusions including type，shape，size and distribution was analyzed. It was found that using these two methods the inclusion types were found almost same with the spherical inclusions in the GCr15 were rich in Ca，Al and S，and also a small number of sharp TiN inclusions with sharp edges. Using ASPEX for multi-faceted multiple scanning，it was found that the distribution of the maximum size spheroidal B-type alumina inclusions was basically in accord with the result of the rotating-bending fatigue test. According to the test results and the principle of two detection methods，the ASPEX method is more effective for the overall analysis of inclusions in steel，such as inclusion size，shape，type，distribution，etc，meanwhile the application of fatigue method is more advantageous for the detection of large-sized rigid inclusions.
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2019, Vol. 54 
