Sunface Exfoliation and Flaking Reason Analysis on Rollers of Full Ball Bearing

Rollers of the full ball bearing which only being used for 5 days failed with surface exfoliation and flaking. By adopting macro examination, metallographic examination,chemical compositions analysis and hardness test the failure reason was analyzed. The result indicate that not sufficient tempering, steep carburized layer hardness gradient, nouniform centre microstructure and lower centre hardness were all main reasons that resulted in the surface exfoliation and flaking of the rollers.