Creep Deformation Behavior and Microstructure of Laves-strengthened Ferritic Heat-resistant Steels Containing Nitrogen or Carbon

The creep deformation behavior and microstructure of a N-containing steel expected to exhibit high strength excellent oxidation resistance were investigated. Even for with W content, it was possible form martensitic by adding sufficient amount N. Comparison the microstructures C-containing confirmed that two steels have same crystal orientation relationship. precipitated Laves phase as strengthening displayed higher than conventional under relatively stress. However, superiority relative decreased low stress exponent different from those steel. This deference considered be ascribed difference variation dislocation density during deformation.