The development of Fe_3Al base heat resistant alloys with specificstrength as high as Ti alloys

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The study is aimed at developing heat resistant Fe_3Al base alloys with high specific strength to replace commercial Ti alloys and heat resistant steels. The objective of this study was two-fold. First, to study the strengthening mechanism of thermomechanically processed Fe_3Al alloys. Second, to investigate high temperature strength and microstructural stability of thermomechanically processed Fe_3Al alloys. The main results are :(1) The introduction of relatively fine κ-Fe_3AlC carbide particles into the matrix during warm rolling promotes the subdivision of matrix grains and is thus effective for strengthening the alloys at relatively low temperatures.(2) The addition of a small amount of Mo into the alloys is beneficial to enhance 0.2% proof stress below 600℃ and the microstructural stability at high temperatures.