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THE EFFECT OF MECHANICAL HEAT TREATMENT ON THE CYCLIC STRENGTH OF HEAT-RESISTANT ALLOYS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The effect of mechanico-thermal treatment MTT on the fatigue strength of EI867 and EI437B nickel alloys has been investigated and the optimal conditions of MTT for these alloys have been determined. Specimens of EI867 nickel alloy were annealed at 1220 degrees C for 5 hr, air cooled, and aged at 950 degrees C for 8 hr. Specimens of EI437B nickel alloy were annealed at 1080 degrees C for 8 hr, air cooled and aged at 700 degrees C for 16 hr. The heat-treated specimens were slowly stretched 0.04 mmmin at 500-900 degrees C up to 0.2-4 percent elongation. After stretching the specimens were held at 500-900 degrees C for 24 hr. So prepared specimens were fatigue tested at 700-900 degrees C under fluctuating loads at 2900 cyclesmin. Author
APPROVED FOR PUBLIC RELEASE