Residual stress and microstructural variations in thick aluminium alloy forgings

J. S. Robinson, C. E. Truman, S. Hossain, R. Wimpory

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The most critical stage in the heat treatment of high strength aluminium alloys is the rapid cooling necessary to form a supersaturated solid solution. During cold water quenching of thick sections, the thermal gradients are sufficient to cause inhomogeneous plastic deformation which in turn leads to the development of large residual stresses. Two 215 mm thick rectilinear forgings made from 7075 and 7010 were heat treated, and the through thickness residual stresses measured by neutron diffraction and deep hole drilling. The distribution of residual stresses was found to be similar for both alloys varying from highly triaxial and tensile in the core to a state of biaxial compression in the surface. The 7010 forging exhibited significantly larger tensile stresses in the core. 7075 is a much more quench sensitive alloy when compared to 7010. This results in loss of supersaturation by second phase precipitation during quenching in the core of the 7075 forging.

Original languageEnglish
Title of host publicationStress Evaluation in Materials Using Neutrons and Synchrotron Radiation - Selected, peer reviewed papers from the Int. Conf. on Stress Evaluation Using Neutrons and Synchrotron Radiation Proceedings
EditorsA.R. Pyzalla, A. Borbely, H. Peter Degischer
PublisherTrans Tech Publications Ltd
Pages45-50
Number of pages6
ISBN (Electronic)9780878493609
DOIs
Publication statusPublished - 2008
EventInternational Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation - Vienna, Austria
Duration: 24 Sep 200726 Sep 2007

Publication series

NameMaterials Science Forum
Volume571-572
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceInternational Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation
Country/TerritoryAustria
CityVienna
Period24/09/0726/09/07

Keywords

  • 7010 7075 aluminium alloy
  • Deep hole drilling
  • Quench sensitivity
  • Thick forgings

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