Method for the preparation of a body of austempered ductile cast

Details Method for the preparation of a body of austempered ductile cast Method for the preparation of a body of austempered ductile cast

1992-09-18

1993-09-28

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148545, 148627, 148631, 148639, C21D 500

Patent

active

052483541

ABSTRACT:
A unique method is proposed for the preparation of a body of an austempered ductile cast iron having a gradient of the mechanical property within the body by subjecting a body of a nodular graphite cast iron to an isothermal transformation treatment for austempering at a temperature in the range from 250.degree. to 450.degree. C. while the body has a temperature difference between two points or between two surfaces. The temperature difference can be produced by bringing the two points or two surfaces into contact with melts of a salt kept at different temperatures. A two-compartment salt-bath apparatus therefore is disclosed.

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