Nitrogen enrichment of surface and near surface regions to produ

Details Nitrogen enrichment of surface and near surface regions to produ Nitrogen enrichment of surface and near surface regions to produ

1994-10-05

1996-04-02

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148232, C23C 826

Patent

active

055036872

ABSTRACT:
Enrichment of surface and near surface regions of stainless steel components that nearly have their final shape with dissolved nitrogen at temperatures between 1000.degree. and 1200.degree. C. is provided. In this way, ferritic and martensitic structure portions in the surface zone are changed to austenite. By means of mixed crystal hardening, nitrogen increases the strength of the surface layer that is formed and that at the same time is characterized by the degree of toughness of the austenitic structure. The combination of strength and toughness leads to a significantly increased resistance to wear, especially wear due to impact, cavitation, and impingement of drops. In contrast to carbon, the resistance to corrosion of the surface layer is not adversely affected when nitrogen diffuses in, but rather is even further increased. The thermal treatment process is suitable for increasing the service life of rust proof components in flow-producing mechanisms.

REFERENCES:
patent: 4154629 (1979-05-01), Asai et al.
H.-J. Spies; "Stand und . . . Gasnitrierens"; Neue Hutte, vol. 36, No. 7, Jul. 1991, Leipzig, Germany, pp. 255-262.
H. Berns; "Nichtrostende . . . Stickstoffgehalt"; VDI Zeit-Schrift, vol. 136, No. 1/2, 1994, Dusseldorf, pp. 74-76.

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