TENSILE AND CREEP PROPERTIES OF Fe3Al-BASED ALLOY WITH DIFFERENT GRAIN SIZES
(Department of Materials Science and Engineering; Southeast University; Nanjing 210096; State Key Laboratory of Solid State Microstructures of Nanjing University; Nanjing 210008)
Abstract: The tensile and creep properties of Fe3Al rolling sheets with the same composition but different grain sizes are investigated, and the results show a complex effect of grain size on the tensile and creep properties of Fe3Al-based sheets. At RT, both strength and ductility increase with the decrease of grain size. For the recrystallized specimen, the improvement of the RT tensile properties is caused by microstructural refinement if the specimen tested is oil quenched. However, the ductility enhancement for the unrecrystallized specimen is a result of minimizing the transverse grain boundaries. At 600 ℃ for the thicker sheets, both the tensile strength and creep resistance of the specimens corresponding to larger grain size are higher than those with fine microstructure.
Key words: Fe 3Al mechanical properties microstructure