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Title: Dual Intensity Peening and Aluminum-Bronze Wear Coating Surface Enhancement
Author: WT Dingwell; AJ Lammas; H Halila, all of OH
Source: US Patent 6,267,558 B1
Publication year 2001
Document number: 2001006
Number of pages: 7
Abstract:
An article and a method for improving an article that results in a reduction or elimination of damage due to fretting from contact of similar metals. The invention
specifically reduces wear-related fretting between titanium alloy parts by lowering the stresses between mating parts. An aluminum bronze coating is applied to one of the
parts. The aluminum bronze coating provides an improvement over prior art coatings in reducing coefficient of friction between the parts. Additionally, the cumulative
stresses at the surface of the parts is reduced by a dual intensity peening treatment. This involves a first peening operation using large peening media that provides a
compressive stress to the required depth. This first peening operation is followed by a second peening operation that provides additional compressive stresses closer to the
dovetail surface. The combined metallurgical and mechanical improvement results in a system with less susceptibility to fretting damage and corresponding improved fatigue
resistance.
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