Abstract
A mold steel for plastic injection was subjected to low cycle fatigue (LCF) tests at temperatures of 25, 200, and 250 °C. LCF tests were carried out at a total strain amplitude (Δet/2) from 0.004 to 0.012 under a constant strain rate of 0.01 s–1. Transmission electron microscope images showed that cyclic loading accelerated dislocation recovery as the LCF test temperature increased. The LCF life increased as a result of improvement in the ductility associated with dislocation recovery as the test temperature increased. The LCF behavior at the test temperature range followed the Coffin–Manson equation. Empirical equation was proposed to predict the LCF life of the mold steel within the test temperature range. Empirical equation was proposed to predict the LCF life of the mold steel considering the total strain amplitude and test temperature, and the calculated LCF life was in good agreement well with the experimental results.
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