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    Volume 5, Issue 5 (December 2016)

    Special Issue Paper

    X-Ray and Neutron Diffraction Studies of Quenched and Partitioned (Q&P) Multiphase Steel Microstructures

    (Received 21 April 2016; accepted 30 June 2016)

    Published Online: 22 December 2016

    CODEN: MPCACD

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    Abstract

    Novel advanced steel developments in recent years have resulted in many steels with complex multiphase microstructures. Foremost currently are steels that contain significant fractions of untransformed parent austenite phase. “Quenched and partitioned” steels, commonly referred to as Q&P steels, important as potential advanced high-strength (AHS) automotive steels, are an example in which the austenite is chemically stabilized by carbon partitioning from martensite following an interrupted quench above the martensite finish temperature, Mf. It is evident that the progress of microstructural change during this novel quenching and partitioning treatment, the volume of untransformed austenite stabilized during partitioning and the behavior of this austenite according to its carbon content should be understood. In relation to these requirements, recent analysis of X-ray powder diffraction (XRD) and neutron diffraction experiments will be considered. Initially, the effect of sample preparation between the two measurement techniques is considered, followed by observation of the partitioning process in real time allowed by specially prepared Mn-containing experimental alloys, with and without a crucial silicon addition required to enable austenite retention during Q&P treatment.


    Author Information:

    Edmonds, David
    Univ. of Leeds, School of Chemical and Process Engineering, Leeds,

    Bigg, Timothy
    Univ. of Leeds, School of Chemical and Process Engineering, Leeds,


    Stock #: MPC20160057

    ISSN:2165-3992

    DOI: 10.1520/MPC20160057

    Author
    Title X-Ray and Neutron Diffraction Studies of Quenched and Partitioned (Q&P) Multiphase Steel Microstructures
    Symposium ,
    Committee E04