Uphill quenching to reduce residual stress in a heat treatable aluminium alloy

J. S. Robinson*, C. E. Truman, A. O’Donovan, J. Rebelo Kornmeier

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)
61 Downloads (Pure)

Abstract

Three rectilinear blocks of the aluminium alloy 7449 were characterised using neutron and X-ray diffraction. One block was heat treated normally and two blocks were subject to uphill quenching from −196°C to 100°C. Boiling water and steam were used to rapidly increase the temperature of the blocks to reverse the thermal gradients introduced by cold water quenching. It was possible to detect the beneficial influence of uphill quenching on residual stress using either fluid. The influence of steam was very effective but localised and limited to the surface in close proximity to the steam jet. For more uniform stress relief, multiple steam jets will be required to ensure the entire surface receives a significant thermal input.

Original languageEnglish
Pages (from-to)1864 -1871
Number of pages8
JournalMaterials Science and Technology (United Kingdom)
Volume35
Issue number15
Early online date14 Aug 2019
DOIs
Publication statusPublished - 13 Oct 2019

Keywords

  • Aluminium alloy 7449
  • heat treatment
  • neutron diffraction
  • residual stress
  • uphill quenching

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