Krishnan K Sankaran

US Patent:

8323427, Dec 4, 2012

Filed:

Sep 14, 2009

Appl. No.:

12/559206

Inventors:

Kevin T. Slattery - St. Charles MO, US
Krishnan K. Sankaran - Saint Louis MO, US
James B. Castle - Saint Charles MO, US
Christopher S. Huskamp - Saint Louis MO, US

Assignee:

The Boeing Company - Chicago IL

International Classification:

C22F 1/04

US Classification:

148523, 148522, 148549, 148552, 148559, 148688

Abstract:

Disclosed embodiments disclose processes for making shaped metal alloy parts, and deal more particularly with forming features and reducing residual stresses in such parts. Residual stresses introduced into a metal alloy part by heat treatment, which may include solution annealing and quenching, are reduced by processes that plastically deform the part while forming part features. An embodiment comprises: producing a metal alloy blank; subjecting the blank to a process that introduces residual stresses into the blank and plastically deforming the blank to reduce the residual stresses in the blank. Embodiments comprise: subjecting a part to a heat treatment that introduces residual stresses in the part; and age forming the part to shape the part and reduce the residual stresses, incrementally forging at least one feature into the part and reducing the residual stresses in the part, friction welding the part, or gauge rolling the cast part to desired dimensions.