STP1077: Acoustic Emission During Tensile Deformation and Fracture in Austenitic Alloys

    Raj, B
    Headresearch scientist, Indira Gandhi Centre for Atomic Research, Kalpakkam,

    Jayakumar, T
    Headresearch scientist, Indira Gandhi Centre for Atomic Research, Kalpakkam,

    Pages: 24    Published: Jan 1991


    Abstract

    The nature of the Acoustic Emission (AE) generated during tensile deformation and fracture of two austenitic alloys i.e., AISI type 316 Stainless Steel (SS) and Nimonic alloy PE-16 are presented and discussed. Effects of second phases on the AE are considered. For 316 SS, the second phases are carbides and inclusions. For PE-16, the second phases are carbides and coherent precipitates i.e., Ni3(Al,Ti). Time and frequency domain analyses have been used to characterise the dislocation behaviour. Correlations of dynamic strain ageing in 316 SS with AE signal are presented. A method to amplify the weak AE signals in 316 SS is highlighted. The studies in PE-16 have shown that AE can be correlated with the type of interactions i.e., whether Orowan looping and/or particle shearing is operating.

    Keywords:

    acoustic emission, stainless steel, deformation, fracture, alloy PE-16


    Paper ID: STP19096S

    Committee/Subcommittee: E07.04

    DOI: 10.1520/STP19096S


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