Abstract
1. The rate of aging and hardening of austenitic steels alloyed with nitrogen depends on the solubility of nitrogen in austenite and the character of the nitride, carbides, and intermetallic phases formed. 2. Steel EP126 first forms a nitride phase with a composition of (Cr, Fe, Ni)2(Nb, W, Mo)2N and a tetragonal structure that does not take part in the aging process. The main hardening of this steel with decomposition of the austenite is due to the precipitation of Fe2W type phase.
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