1988 Volume 74 Issue 6 Pages 1097-1104
Mapping of low cycle fatigue mechanisms at elevated temperatures was attempted for a better understanding of low cycle fatigue behavior of an austenitic stainless steel at elevated temperatures. Results of strain-controlled, uniaxial low cycle fatigue tests on solution treated stainless steel of type 310 were used in the present analysis. The experiments were performed under the conditions of 15 different temperatures from room temperature to 800°C, and 4 strain rates from 6.7 × 10-3 s-1 to 6.7 × 10-6 s -1. Modes of dislocation structure and fracture were classified according to stress amplitude and fatigue life respectively and plotted on temperature-strain rate diagram. By superposing the two maps, it becomes easy to find the principal factors which govern the fatigue life under any conditions of temperature and strain rate. The proposed idea of mapping is believed to have wide applicability, e.g. for selecting materials and predicting fatigue behavior under service conditions.
