Process for producing a surface-hardened workpiece from sintered

Details Process for producing a surface-hardened workpiece from sintered Process for producing a surface-hardened workpiece from sintered

1993-08-02

1995-01-24

Dean, Richard O.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148225, 148226, 148230, C23C 818

Patent

active

053839790

ABSTRACT:
In a process for producing a workpiece from sintered metal, especially from sintered iron, the latter is subjected, after sintering, to a steam treatment at temperatures below 500.degree. C., especially at 430.degree.-480.degree. C., at a steam partial pressure of from 20 to 80 mbar, especially from 30 to 50 mbar, to form an oxide layer on the surface, and to subsequent surface-hardening. Workpieces, especially internally geared wheels for starters, having a wear-resistant surface and, in the core, properties unchanged by the hardening are obtained.

REFERENCES:
patent: 4738730 (1988-04-01), Ferguson
patent: 4799970 (1989-01-01), Koiso et al.

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