Abstract
1. The variation of the notch sensitivity with the notch radius differs for quenched steels tempered at high and low temperatures. With a large notch radius the notch sensitivity of steel tempered at high temperature is close to unity and decreases sharply with decreasing notch radius. The notch sensitivity of steels tempered at low temperature remains low both with sharp and blunt notches. 2. The reason for the sharp reduction of the notch sensitivity with a small notch radius after tempering at high temperature is the formation of nonpropagating cracks. 3. After low-temperature tempering the second-order residual stresses favor nucleation of a fatigue crack at some distance from the surface, which in the presence of a stress gradient in the notch leads to an increase of the fatigue limit of notched samples and lower sensitivity to stress concentrations.
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