Process for austempering ductile iron

Details Process for austempering ductile iron Process for austempering ductile iron

1996-11-05

1998-05-19

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148612, C21D 500

Patent

active

057530556

ABSTRACT:
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.

REFERENCES:
patent: 4891076 (1990-01-01), Kovacs
patent: 5522949 (1996-06-01), Widmer et al.

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