Correlation between Ultrasonic Attenuation and Fracture Toughness of Steels
An ultrasonic index has been found for direct NDT estimation of the fracture toughness of three different steels; one forged bainitic and two rolled: ferritic-pearlitic and acicular ferritic. Direct correlations have been found between ultrasonic attenuation and Critical Stress Intensity Factor in plain strain (KIC), Ductile Fracture Appearance Transition Temperature of Charpy-V curve (FATT) and Shelf Energy of the Charpy-V curve itself (KV).
A direct correlation has also been found between fracture toughness indices and grain size. To obtain these results a new method has been developed for measuring ultrasonic attenuation at room temperature on thin specimens even at high absorption.
KeywordsFracture Toughness Stress Intensity Factor Acicular Ferritic Ultrasonic Attenuation Bainite Structure
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