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    Volume 5, Issue 5 (December 2016)

    Special Issue Paper

    EBSD Characterization of Pilgered Alloy 800H After Heat Treatment

    (Received 2 May 2016; accepted 30 June 2016)

    Published Online: 22 December 2016

    CODEN: MPCACD

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    Abstract

    Austenitic stainless steel alloy 800H pipes were received in an as-pilgered condition. The pilgering process produces high levels of cold work through complex deformation processes. The pipes are subsequently solution annealed. To assess the influence of heat-treatment parameters on 800H, samples of the as-pilgered material were heat treated in the temperature range 600°C–1200°C for varying lengths of time. Using electron backscatter diffraction (EBSD), the recrystallization dynamics and grain size of all samples was measured. Additionally, the kernel average misorientation and grain orientation spread methods were employed to qualitatively analyze fine details in the strain levels in the matrix of both deformed and recrystallized grains. For 1-h anneal times, it was found that recrystallization of 800H initiates above heat-treatment temperatures of 800°C, and complete recrystallization of deformed material occurs above heat-treatment temperatures of 950°C. No significant increases in average grain size were observed until temperatures reached in excess of 1000°C. Increasing the heat-treatment time to more than 1 h had a negligible effect on the grain size for every heat-treatment temperature that was assessed. In high-temperature applications, pipes typically fail because of diffusion-based creep mechanisms. Therefore, accurate control of the grain size and microstructure during heat treatments is obligatory. This work provides a framework for controlling manufacturing processes to produce favorable microstructures in 800H for creep-based applications.


    Author Information:

    Beardsley, A. L.
    Dept. of Mechanical Engineering, Univ. of Canterbury, Christchurch,

    Bishop, C. M.
    Dept. of Mechanical Engineering, Univ. of Canterbury, Christchurch,

    Kral, M. V.
    Dept. of Mechanical Engineering, Univ. of Canterbury, Christchurch,


    Stock #: MPC20160062

    ISSN:2165-3992

    DOI: 10.1520/MPC20160062

    Author
    Title EBSD Characterization of Pilgered Alloy 800H After Heat Treatment
    Symposium ,
    Committee E04