www.geartechnology.com/articles/20208-austempered-nodular-cast-irons
Austempered Nodular Cast Irons
March 1, 1985
Austempering heat treatments
(austenitizing followed by rapid cooling
to the tempering temperature) have been
applied to nodular irons on an experimental basis for a number of years, but commercial interest in the process has
only recently come to the surface.