The effects of precycling and surface removal were investigated. Both the fatigue life and fatigue limit were dependent on the severity of precycling. Cycling with stress amplitude below the fatigue limit after precycling showed a dependence of the logarithmic number of cycles to failure on the fracture of prefatigue damage. The interdependence of fatigue life and fatigue limit to precycling history was attributed to microcrack formation, principally restricted to a surface layer of less than 100 mu m. Fatigue damage could be either partially or totally eliminated by surface removal. The alpha / beta interphase region of the surface layer appeared to offer preferred sites for dislocation pile-ups and crack initiation. 4 refs.
|Original language||English (US)|
|Number of pages||6|
|Journal||Metallurgical transactions. A, Physical metallurgy and materials science|
|State||Published - Jan 1 1983|
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