The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2005
Filed:
Oct. 29, 2002
Paul E. Magnusen, Pittsburgh, PA (US);
Dhruba J. Chakrabarti, Export, PA (US);
Anne E. Zemo, Riverdale, IA (US);
Robert W. Westerlund, Bettendorf, IA (US);
Anthony Morales, Bettendorf, IA (US);
Daniel T. Moulton, Bettendorf, IA (US);
Paul E. Magnusen, Pittsburgh, PA (US);
Dhruba J. Chakrabarti, Export, PA (US);
Anne E. Zemo, Riverdale, IA (US);
Robert W. Westerlund, Bettendorf, IA (US);
Anthony Morales, Bettendorf, IA (US);
Daniel T. Moulton, Bettendorf, IA (US);
Alcoa Inc., Pittsburgh, PA (US);
Abstract
A process for improving 6XXX alloys, such as 6013, preferably includes heating, hot rolling, inter-rolling thermal treatment at a very high temperature such as 1020° F. or more, again hot rolling (with or without subsequent continuous hot rolling or cold rolling or both), solution heat treating and artificial aging. The initial heating, inter-rolling, thermal treatment and solution treatment, especially the latter two, are carried out at very high temperatures such as 1030° F. Each aforesaid hot rolling stage produces substantial metal thickness reduction. The improved sheet or plate product has a substantially reduced occurrence of reduced density features revealed in scanning electron microscope examination at 500X and exhibits improved (reduced) fatigue crack growth rate providing an advantage in aerospace applications such as fuselage skin, especially fuselage belly skin.