Crack Paths 2012

Figure 3. Fatigue initiators in bearing steel. Sizes of balls indicate ¥area of inclusion.

Multiple crack initiation

round a spherical cave for

oxide inclusion in 100Cr6

bearing steel fatigue

tested for 642 million

cycles at 735 M P a(R=-1).

Crack 3 lies on clearly

different plane and has

grown below 1 and 2,

thus causing retardation

and nonsymmetrical crack

growth.

Figure 4. Crack paths round the inclusion associated with the longest endurance.

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