Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 06, 2021
In this study, the creep rupture time and creep properties of Ti43Al5V4Nb were evaluated at 1033 K (760°C), which was designed usage limited temperature and 923 K (650°C), which was close to the usage temperatures for the material at actual components. The creep strain curve at 923 K showed a smaller percentage of tertiary stage creep than that at 1033 K. The fracture surface of the crept specimen at 1033 K had many dimples due to ductile fracture mode, and the fracture surface at 923 K showed intergranular cracking due to brittle fracture mode. Creep rupture time was calculated using the θ method proposed by Evans et al. By considering both stress and temperature in the θ parameter, the minimum strain rate under arbitrary stress and temperature conditions could be calculated. The creep rupture life in the range from 923 K to 1073 K could be predicted within a factor of 2 scatter band by using the Monkman-Grant rule.
