Robert L. Ferguson
An investigation was conducted to evaluate the effects of surface roughness on fatigue properties of low-carbon N-155 alloy with a grain size of A.S.T.M. 6 of S-816 alloy with a grain size of A.S.T.M. 6 to 7. Fatigue studies were conducted at 80, 1200, 1350, and 1500 degrees F. In addition, an investigation of the effect of surface abrasion upon nature, direction, magnitude, and depth of residual stresses and of the effect of time and temperature upon the relief of these stresses was conducted.
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