Grain reinforcement by aluminium nitride in rail steel (TN-FM-010)

The inhibition of austenite grain growth and consequent fine ferrite grain size in steels treated with aluminium, has been attributed to the action of aluminium nitride precipitate particles (1, 2). Normalising of aluminium-treated steels in the lower austenite range results in a fine dispersion of aluminium nitride which restricts grain...