Abstract
Low cycle fatigue (LCF) of a molybdenum alloy was investigated under force-controlled cyclic tension with a zero minimum stress within the 850 – 1300 °C temperature range using Gleeble-3800 physical simulator. Also, the work softening (hardening) behavior was examined through a monotonic tension up to fracture after the force-controlled cyclic deformation. The investigated material under a force-controlled cyclic loading tends to work softening and its tensile strength decreases until the applied stress. The LCF fracture in such conditions occurs through the unrestricted plastic (creep) strain accumulation and exhaustion of the plasticity. The Morrow-type fatigue curves were obtained from the tests. The results of work softening tests were also used to predict the fatigue life.
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