METALLURGY AND CREEP BEHAVIOR OF TYPE 310S STAINLESS STEEL AT HIGH TEMPERATURE IN DIFFERENT ATMOSPHERES AND LOADING CONDITIONS

摘要

Some large loading fixtures and furnaces intern parts are used for the heat treatment of aeronautical components. These reusable fixtures endure a succession of thermal cycles including quenching. Due to the loading and to the temperature, these devices are submitted to creep under complex atmosphere with low oxygen partial pressure content Unusual damages and high creep strain rates have been reported on components made of 310S Stainless Steel. Therefore, the mechanical behavior at high temperature of this alloy was investigated. Many data are available in the literature about isothermal creep but few take into account the effects of atmosphere, thermo-mechanical cycles and microstructure evolution due to ageing. In addition to metallurgical characterization, in situ creep tests and conventional mechanical tests were performed to study the influence of the following parameters: temperature, stress level, thermo-mechanical cycles and atmosphere.