What is the Effect of Reticulated Carbide on the Rerformance of Double Row Deep Groove Ball Bearings?

Due to the presence of reticulated carbide in the bearing steel material will increase the chemical composition of the steel inhomogeneity, in the heat treatment and quenching is easy to cause a lot of organizational stress, resulting in double row deep groove ball bearings parts of the deformation and cracking. The presence of reticulated carbide greatly weakened the contact between the matrix grains, so that the mechanical properties of bearing steel is reduced, especially the impact performance of the reduction, and with the increase in the level of reticulated carbide, impact performance is constantly reduced.

The reticulated carbide also has a significant effect on the bending strength limit and tensile strength limit. In addition, the contact fatigue strength decreases as the reticulated carbide level increases in bearing steels, and the contact fatigue strength of longitudinal specimens with coarse reticulated carbides decreases by about 30%. Each increase in the reticulated carbide level reduces the service life of the bearing by about 1/3.

Severe reticulated carbides cannot be eliminated during the subsequent spheroid annealing process, and the reticulated carbides can only be eliminated or improved through the normalizing process. If the reticulated carbide is light, part of the network can be broken off during the spheroid annealing process and can be spheroidized. However, the carbide particles are larger and the carbide particles in the spheroid annealed tissue are not uniform.

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