Patent application number | Description | Published |
20100221118 | INTEGRALLY BLADED ROTATING TURBO MACHINERY AND METHOD AND APPARATUS FOR ACHIEVING THE SAME - A method and an apparatus for performing the method of inducing compressive residual stress in blading members integrally formed with a rotor. The method includes using a caliper-type burnishing tool such that the caliper arms of the tool are contoured and oriented for placing the burnishing elements on opposite sides of the blading member to be treated. The blading member is burnished to introduce a pre-determined pattern of residual compressive stresses in a selected area of the blade. | 09-02-2010 |
20100248003 | Metallic article with improved fatigue performance and corrosion resistance - A metallic article with improved fatigue performance and resistance to corrosive attack and stress corrosion cracking is produced by treating a first area of a metallic article with a first surface treatment that induces a specified amount of cold work. A second, sacrificial area of the metallic article in electrical communication with the first area is treated with a second surface treatment that induces an amount of cold work higher than that of the first surface treatment. Due to the differences in cold work resulting from the different surface treatments, the second area of the metallic article is less noble than the first area and is therefore more susceptible to corrosive attack. As a result, the second sacrificial area will preferentially corrode leaving the first area protected from corrosive attack. Compressive residual stresses induced in the surface of the metallic article through the surface treatments improve the fatigue performance and resistance to stress corrosion cracking. | 09-30-2010 |
20110079070 | Method for preventing or arresting crack development and propagation - A method for preventing or arresting the development and propagation of cracks in the material surrounding a fastener. The method includes introducing compressive residual stresses in the material surrounding the fastener. The compressive residual stresses offset the high residual tensile and applied stresses which the material may be subjected to in operation and thereby prevent or arrest the development of cracks. Using the output of a sensor, the surface treatment apparatus is positioned relative to a fastener. A compression tool is impinged against the surface of the material adjacent to the fastener and rotated around the perimeter of the fastener thereby inducing a zone of compressive residual stress. | 04-07-2011 |
20110085913 | Integrally rotating turbo machinery and method and apparatus for achieving the same - A method of inducing compressive residual stress of blading members integrally formed with a rotor. The method includes using a caliper-type burnishing tool such that the caliper arms of the tool are contoured and oriented for placing the burnishing elements on opposite sides of the blading member to be treated. The blading member is burnished to introduce a pre-determined pattern of residual compressive stresses in a selected area of the blade. | 04-14-2011 |
20110223443 | Metallic components for use in corrosive environments and method of manufacturing - The present invention relates to a metallic component and method of manufacture of the component for use in a corrosive environment, such as components used in fossil fuel recovery or used in chemical facilities. The components comprise at least one metallic portion having a deep, stable layer of compressive stress for providing life extension and mitigation of fatigue and corrosion related failures. Preferably, the layer of compressive stress has a depth that exceeds the depth of any surface irregularities. | 09-15-2011 |
20120204390 | Burnishing tool and method for burnishing - A burnishing tool and method for providing a surface treatment along the surface of a work piece, the burnishing tool having a tool head comprising a bearing for supporting a rolling element and an encasement for supporting the bearing. The bearing is formed from a self-lubricating polymer such as, but not limited to, polytetrafluoroethylene based resin, ultra-high-molecular-weight polyethylene based resin. | 08-16-2012 |
20130034448 | Integrally Rotating Machinery and Method and Apparatus for Achieving the Same - An article formed with blading members comprising a rotor a a plurality of blading members integrally formed with the rotor wherein each blading member having continuous zones of compressive residual stress on the pressure side and the suction side and extending substantially along the perimeter and extending inwards, towards the center of each blading member, and wherein the continuous zones of compressive residual stress have an improved surface finish. | 02-07-2013 |
20140130321 | BURNISHING TOOL AND METHOD FOR BURNISHING - A method for providing a surface treatment along the surface of a work piece, using a burnishing tool having a tool head comprising a bearing for supporting a rolling element and an encasement for supporting the bearing. The bearing is formed from a polymer or polymer resin such as, but not limited to, polytetrafluoroethylene based resin, ultra-high-molecular-weight polyethylene based resin. | 05-15-2014 |