Abstract
Rotating beam fatigue tests over the temperature range 20-450°C were made on low carbon steel in annealed and low-temperature-quenched conditions. The relationship σw=Cw+kwd-1/2 which describes the dependence of the fatigue limit σw on the grain diameter d has been proved in this series of experiments to apply up to about 400°C. Both of the two constants Cw and kw reached the maximum at 350-375°C and the minimum at about 200°C. The existence of the maximum in the values Cw and kw is found to be caused by a rapid strain ageing. The fatigue strength at 450°C was independent of the grain size. Below 400°C, σw is increased by quenching. The increase in σw is induced by an increase in Cw, not in kw, which is little influenced by quenching. The increase in Cw only may be explained as the consequence of precipitation hardening due to quench-ageing developed prior to fatigue stressing .
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