STP1169: Strain-Aging Susceptibility of a Steel Repair Weld Using Internal Friction

    Pan, Z-L
    Scientist and senior scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba

    Ritchie, IG
    Scientist and senior scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba

    Bailey, N
    Principal research metallurgist, The Welding Institute, Cambridge,

    Pages: 13    Published: Jan 1992


    Abstract

    Measurements of the concentrations of free impurity interstitials in ferritic steels are of considerable importance in the evaluation of the strain-aging susceptibility of the steels. Traditionally, determination of interstitial concentrations has been carried out by measurement of the heights of the carbon and nitrogen Snoek peaks using internal friction techniques. However, in the case of steels containing significant concentrations of nitride or carbide formers in substitutional solid solution, pre-precipitation clustering of free impurity interstitials around the substitutional impurities leads to extraordinary Snoek peaks. Such is the case in steel repair welds containing 1.5% by weight manganese. Nevertheless, by studying both the Snoek spectrum and the interaction of the impurity interstitials with dislocations, the susceptibility to strain aging can be assessed.

    Keywords:

    nitrogen and carbon interstitials, Snoek peaks, strain aging, internal friction, mild steels, steel welds, composite oscillator, materials damping, internal stress, mechanical properties


    Paper ID: STP17984S

    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP17984S


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