Chromium boron surfaced nickel-iron base alloys

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

C - Chemistry, Metallurgy

23

C

117/74.5

C23C 10/54 (2006.01) C23C 12/00 (2006.01)

Patent

CA 1223780

-27- Chromium Boron Surfaced Nickel-Iron Base Alloys 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 ex- tends in two essential concentration zones to a total depth of about 40 x 10-6 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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