Volume 17, Issue 3 (May 1989)

    Influence of Heat Treatment on Structure and Oxidation Behavior of Zr-2.5Nb

    (Received 5 April 1988; accepted 31 October 1988)

    CODEN: JTEOAD

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    Abstract

    This paper presents the influence of different heat treatments on the microstructure and isothermal oxidation behavior of Zr-2.5Nb in oxygen. The quenched structure consisted of martensitic α′. Upon tempering the quenched alloy at 500°C for up to 100 h, βNb precipitated in the matrix, at twin and α′ needle boundaries. At higher tempering temperatures and after longer periods, Nb-rich βZr also precipitated. Specimens slowly cooled from the β-phase showed the least resistance to oxidation. The oxidation behavior also varied with the tempering time and temperature. The increased oxidation rate of specimens tempered at 500°C for 1000 h or at 600°C, as compared to those tempered at 500°C for shorter times, has been attributed to formation of Nb containing oxides on the coalesced Nb-rich precipitates and to cracking.


    Author Information:

    Ramanathan, LV
    Instituto de Pesquisas Energetícas e Nucleares, C.P. 11049, Cidade UniversitariaUniversity of Manchester, São Paulo,

    Costa, I
    Instituto de Pesquisas Energetícas e Nucleares, C.P. 11049, Cidade UniversitariaUniversity of Manchester, São Paulo,

    Monteiro, WA
    Instituto de Pesquisas Energetícas e Nucleares, C.P. 11049, Cidade UniversitariaUniversity of Manchester, São Paulo,


    Stock #: JTE11108J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11108J

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    Author
    Title Influence of Heat Treatment on Structure and Oxidation Behavior of Zr-2.5Nb
    Symposium , 0000-00-00
    Committee B10