Abstract
Mechanical characteristic of build-up material was evaluated by the tensile test. Stress-strain behavior was examined at various temperatures. It has been understood that the build-up material shows a brittle fracture at low temperature. In addition, it has been understood that low temperature strength decreases greatly by thermal oxidation at high temperature storage. The FT-IR spectrum analyses clarified that the cause of the strength degradation was an increase of carbon-oxygen double bond during the thermal oxidation process. Based on the mechanism of thermal oxidation, the strength degradation behavior was formulated by an expression based on Arrhenius rule.
