Abstract
Abstract The average life to fracture of vacuum-annealed and polished α-iron specimens fatigued in push/pull with a stress cycle of ± 9 tons in−2 is 2·6 × 106 cycles. Subcritical annealing of the specimen after 106 cycles produced no significant change in the total number of cycles to fracture. Recrystallization did not occur. When the annealing temperature was raised to 920° C, so that recrystallization was induced by the phase changes, the total life to fracture significantly decreased. Recrystallization at earlier stages of the expected life rendered this decrease more pronounced, and in order to have no effect recrystallization had to be carried out at < 5% of the expected life for an uninterrupted test. Similar results were obtained with higher-stress, shorter-life specimens. Electron and optical micrographic evidence indicated that the surface topography was responsible for the failure of annealing to “renew” the specimen. The behaviour of the yield drop and yield extension provided further evidence...
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