Abstract
Iron-0.5% carbon was fatigued in air and in vacuum. The knee in the S-N curve at the fatigue limit occurred at about the same number of cycles in vacuum as in air but at a higher strain. Above this strain specimens lasted about ten times as long in vacuum as in air. Slip occurred in a similar manner above and below the fatigue limit and cracks formed in the slip bands in both cases. Below the fatigue limit the cracks grew a few microns long.

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