SEDL / STP / STP1077-EB / STP19096S

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

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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.