Abstract
The effects of degree of reduction by cold-drawing and annealing temperature on the fatigue strength of red brass,cartridge brass and Albrac at 10,000,000 cycles were studied on rotating-beam fatigue tester. The following results were obtained ; (1) Cold-drawing increases the fatigue strength of the alloys but excessive working reduces the fatigue strength. The relations between the fatigue strength and degree of reduction up to 50 per cent are shown in Fig. 5. (2) Low-temperature annealing treatment after cold-drawing is more effective for heightening the fatigue strength. (3) The fatigue strength increased by cold working is not effected or only slightly increased with annealing treatment up to recrystallzation temperature and decreases with annealing treatment over recrystallzation temperature. The fatigue strength reduced by excessive cold working increases with annealing teratment up to recrystallzation temperature and then decreases with annealing treatment over recrystallzation temperature. Those results are shown in Fig. 9.
