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The effect of variation in the pouring temperature on the bending fatigue properties of “precision-cast” fatigue specimens of alloy X-40 when tested at room temperature, 1200 F, and 1600 F, is reported. The average unnotched fatigue strength of the low-pouring-temperature fine-grained material, is appreciably superior to that of the high-pouring-temperature material at room temperature and at 1200 F but only slightly superior at 1600 F. At all temperatures, the variation between the notched fatigue strengths of the two is less than for the unnotched. The notch sensitivity of carefully ground notches was greater at 1200 F than at either room temperature or 1600 F, where it was very small. Machined notches have higher fatigue strengths at room temperature and 1200 F than carefully ground notches. Some tensile strengths are also reported.
Toolin, P. R.
Research Engineer, Westinghouse Research Laboratories, East Pittsburgh, Pa.