Abstract
Acoustic emission (AE) monitoring in conjunction with fracture toughness testing of chevron-notched specimens was employed to investigate crack growth in four steels prepared by electroslag-remelt casting. 15-5PH, AISI 4140, D6AC, and AISI 440C were investigated. AE data were recorded and correlated with variations in fracture toughness test behavior and fracture surface topography. AE parameters such as total counts, count rate, amplitude distribution, etc., were used to characterize flow and fracture processes. AE measurements were observed to have good correlation with crack growth parameters and the energetics of discrete cracking events.
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