Abstract
A study has been made of the precipitation reactions in Fe-30 wt pct alloys containing up to 5 wt pct Nb. The as-quenched structures of these alloys consist, of austenite, martensite in twinned as well as in massive form, and Ni3Nb and Fe2Nb precipitates. On aging at 700° and 800°C the main precipitation reaction results in the formation of hexagonal Laves phase Fe2Nb, but Ni3Nb in both bct and orthorhombic structures also precipitates. The precipitation of Fe2Nb is a heterogeneous process and results in a considerable increase in the hardness of the alloy.
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