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Which effect in a bearing steel lattice develops subsurface cracks?

A)Rolling contact fatigue
B)Grain boundary diffusion
C)Oxidation embrittlement
D)Martensitic phase transformation

💡 Explanation

Rolling contact fatigue initiates micro-cracks within the bearing steel lattice due to repeated Hertzian stresses. These stresses exceed material's fatigue limit, therefore, cracks propagate inward rather than surface wear, which would result from adhesive wear.

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