A process for austempering ductile iron

Details A process for austempering ductile iron A process for austempering ductile iron

C - Chemistry, Metallurgy

21

D

C21D 1/20 (2006.01) C21D 5/00 (2006.01) C21D 1/60 (2006.01)

Patent

CA 2218788

A process for austempering ductile iron includes austenitizing a ductile iron casting of low alloy content followed by quenching the workpiece for a controlled period of time in a quench medium such as water, an aqueous polymer solution or a medium speed quench oil. The workpiece is then austempered in an air tempering furnace, resulting in a ausferrite microstructure essentially free of pearlite and martensite, and with mechanical properties meeting ASTM designation A897-90 "Standard Specification for Austempered Ductile Iron Castings." The process eliminates the need for a molten salt bath for quenching and tempering.

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