Chromium boron surfaced nickel-iron base alloys

Details Chromium boron surfaced nickel-iron base alloys Chromium boron surfaced nickel-iron base alloys

1983-07-08

1984-11-27

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having composition, density, or hardness gradient

428656, 428666, 428667, B32B 514

Patent

active

044851480

ABSTRACT:
Chromium boron diffusion coatings on nickel iron alloys uniquely provide them with improvement in high cycle fatigue strength (up to 30%) and erosion resistance (up to 15 times), compared to uncoated alloy. The diffused chromium layer extends in two essential concentration zones to a total depth of about 40.times.10.sup.-6 m, while the succeeding boron layer is limited to 50-90% of the depth of the richest Cr layer nearest the surface. Both coatings are applied using conventional pack diffusion processes.

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Cubberly, W. H. et al., Metals Handbook 9th Edition, vol. 3, Am. Soc. for Metals; p. 5, (1980).

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