Effect of heredity of central carbon segregation on sliding wear properties of GCr15 bearing steel

The microstructure heredity of carbon segregation leads to uneven distribution of carbides and cannot be completely eliminated in subsequent heat treatment, thus affecting the wear resistance of bearings. The hot acid corrosion test was carried out on the rolled and spheroidized annealing samples, and the C element distribution and microstructure of the samples were analyzed by electron probe spectrometer and scanning electron microscope (SEM). The sliding friction and wear test of bearing steel with segregation under dry friction condition was carried out by using RETC multifunctional friction and wear tester, and the wear rate was calculated by white light interferometer. The wear morphology of the samples was compared and analyzed by scanning electron microscopy (SEM) and EBSD. The influence of the heredity of central carbon segregation on the sliding friction and wear properties of GCr15 bearing steel was studied. The results show that the carbon segregation of GCr15 bearing steel has structural heredity, which makes the segregation more serious than the non-segregation, and the wear resistance is reduced.