Effect of Cold Ring Rolling on Microstructure and Wear Resistance of GCr15 Bearing Steel with Different Solution Temperatures

By means of cold ring rolling (CRR), quenching and tempering treatments, microstructure observation, and mechanical‐property tests, the effects of CRR on the microstructure and wear resistance of GCr15 bearing steel are studied. The results show that the carbides before heat treatment are refined by CRR, and a large number of small‐sized Cr 7 C 3 carbides appear. Compared with the samples without CRR, the number of undissolved carbides in the CRR samples is obviously reduced. CRR promotes the dissolution of large‐sized carbides during solution treatments while retaining a large number of fine Cr 7 C 3 carbides when the solution treatment temperature is below 860 °C. After tempering, the amount of carbide precipitation in the CRR samples increases, and the carbide is fine and uniform. When the solution temperature is 840 °C, the tempering hardness of the CRR samples reaches the highest of 747.31 HV 1 . When the solution temperatures are above 840 °C, the tempering hardness of the CRR samples is always higher than that of the samples without CRR. When the solution temperature is 840 °C, the wear resistance of the CRR sample is the best, and the wear loss is only 0.45 × 10 −4 mg/(N·m).