Metallurgical and Materials Transactions B

, Volume 27, Issue 3, pp 501–508 | Cite as

A process model for on-line quenching of aluminium extrusions

  • Niklas Järvstråt
  • Stig Tjøtta
Mathematical Modeling
Received:

Abstract

A complete process model for the cooling of aluminium extrusions is presented. It is capable of predicting both thermally induced distortions and possible strength reductions. The model consists of three parts: a thermal part, a metallurgical part, and a mechanical part. The thermal part includes heat-transfer and heat-conduction models and generates the temperature history needed as input to the other two parts. The metallurgical part consists of a kinematic model for the precipitation of nonhardening particles during cooling, and it predicts the resulting strength after subsequent aging. Finally, the mechanical part comprises the usual compatibility and consistency equations, as well as a unified material model that is very accurate both for rate-dependent material behavior at high temperatures and for the virtually rate-independent behavior at low temperatures. Water-cooling experiments have been performed, and finite element simulations were executed using the process model. The heat-transfer coefficient for water quenching is shown to be extremely sensitive to geometry and other cooling conditions. In addition, the cooling characteristics and the material model are factors of equal importance in the prediction of distortions.

Keywords

Material Transaction Strength Reduction Mg2Si Particle Thermal Part Generalize Plane Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1996

Authors and Affiliations

  • Niklas Järvstråt
    • 1
  • Stig Tjøtta
    • 2
  1. 1.Military Engines DivisionVolvo Aero CorporationTrollhättanSweden
  2. 2.Research and Development CentreHydro AluminiumHavikNorway

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