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    Volume 6, Issue 5 (October 2017)

    Special Issue Paper

    Uphill Quenching of Aluminum Alloys

    (Received 21 December 2016; accepted 6 March 2017)

    Published Online: 05 October 2017

    CODEN: MPCACD

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    Abstract

    Uphill quenching is often not well understood and there are relatively few publications on the topic. Uphill quenching was originally developed by Alcoa approximately 50 years ago for aluminum alloys. It has also been referred to as “deep freezing” or “tri-cycle stress relieving.” Uphill quenching has been reported to provide residual stress reduction that may exceed 80 %. Therefore, uphill quenching is typically used to achieve dimensional stability in several critical types of aluminum parts. Uphill quenching is typically applied after quenching and before aging. The uphill quenching process consists of the immersion of the part into a cryogenic environment and after cooling is immediately followed by transferring to a hot-steam fixture to obtain a temperature gradient that maintains the mechanical properties gained with the heat treatment. When performed properly, uphill quenching results in low residual stresses and improved dimensional stability. This paper provides an overview of the uphill quenching process and its application in the heat treatment of critical aluminum alloy components such as large aerospace components.

    Author Information:

    Mattos, W. S.
    Universidade de São Paulo, Escola de Engenharia de São Carlos, São Carlos, SP

    Federal Institute of São Paulo, Aircrafts Maintenance Technology, São Carlos, SP

    Totten, G. E.
    Portland State University, Department of Mechanical and Materials Engineering, Portland, OR

    Canale, L. C. F.
    Universidade de São Paulo, Escola de Engenharia de São Carlos, São Carlos, SP


    Stock #: MPC20160125

    ISSN:2379-1365

    DOI: 10.1520/MPC20160125

    Author
    Title Uphill Quenching of Aluminum Alloys
    Symposium ,
    Committee B07