Article | REF: BM5043 V1

Fatigue of ferrous alloys - Influencing factors

Author: Jian LU

Publication date: January 10, 2003

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4. Surface finish

It has long been known that roughly machined mechanical parts fail faster than perfectly polished ones. This is because fatigue cracks usually initiate on the surface of mechanical parts before leading to failure. It should be noted that, during the machining of a mechanical part, the creation of surface roughness is always accompanied by a change in the structural state of the material's surface layers (work hardening, thermal phenomena) and a change in the state of stresses (residual stresses).

Evolution of surface finish factor K s as a function of tensile strength R m and roughness Rt
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Surface finish