Patent ID: 8367217

Claim:
An article comprising: (i) a substrate material comprising iron alloys; and (ii) an electrodeposited substance forming a metallic layer and/or patch on said substrate material said metallic layer and/or patch comprising cobalt and nickel containing a minimum Co content of 75% per weight, up to 25% per weight; of Ni, W in the range of 0 to 25% per weight, P in the range of about 0 to 25% per weight; and boron in the range of between 0 to 5% per weight, wherein said metallic layer and/or patch has a microstructure which is fine-grained with an average grain size between 2 and 5,000 nm and/or amorphous; wherein said metallic layer and/or patch exhibits a tensile or compressive internal stress in the range of between 2.5 and 30 ksi, and has a thickness between 6.4 micron and 254 micron, and has a porosity in the range of between 0 and 1.5%; wherein said article comprising the substrate material and the electrodeposited substance exhibits a fatigue life cycle number equivalent to or exceeding a fatigue life cycle number of one of either an uncoated substrate material or equivalent thickness engineering hard chromium coated substrate material having a hardness between 600 and 1,000 VHN, when tested at an applied stress of between ⅓ and ⅔ of the yield strength of said uncoated substrate material; wherein said fatigue life cycle number is an axial fatigue cycle number or a rotating beam fatigue cycle number; and wherein the equivalent thickness engineering hard chromium coated substrate material has the same thickness as the electrodeposited substance.