Method for the preparation of a body of austempered ductile cast iron
US5248354A · kind A · utility
3Cited by
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1Claims
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Key dates
| Filing date | Sep 18, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Sep 18, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2281/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.