Precipitation in dilute chromium-nitrogen alloys

Precipitation in chromium-nitrogen alloys containing 0.011 and 0.014% nitrogen has been followed by resistivity and hardness measurements on specimens quenched from 1200°C and aged between 125° and 400°C. Precipitation followed a single-stage, diffusion controlled process, which in the early stages obeyed the equation W = kfn in which the shape-dependent exponent n had a mean value 1.38, approximating to the value 32 derived by Zener for...