EFFECT OF TUNGSTEN ADDITION ON MECHANICAL PROPERTIES OF Fe3Al-BASED ALLOYS
(Department of Materials Science and Engineering,Southeast University, Nanjing210096, P. R. China)
Abstract: The microstructure and mechanical properties of Fe3Al-based alloys containing tungsten were investigated. Tungsten added to Fe3Al-based alloys results in significant increases of tensile strength and creep rupture life, but slight decrease of RT ductility. The addition of tungsten combined with niobium or molybdenum is more effective on improving creep resistance and yield strength at the high temperature of 600℃. Microstructure observations indicate that the addition of tungsten causes the microstructure refinement and formation of M6C type precipitates which strengthen both the matrix and grain boundaries.
Key words: Fe3Al W mechanical properties