Bearing damage can result from spalling due to inadequate lubrication or plastic deformation from excessive load.
1. Spalling, loss of small flakes of material due to fatigue. In this case, it is caused by inadequate lubrication in particular film thickness and/or lubricant cleanliness, which causes metal-to-metal contact
2. Plastic deformation, damage occurs when a load exceeds the yield strength of the material (load too high)
reference : Bearing damage and failure analysis by SKF
"Note, BSFM is the highest. This means that not only the ball is damaged but other components are also damaged, in this case the outer is also damaged. But the dominant remains on the ball" - said Agus Wibowo and I also agree