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Abstract

Fracture toughness indices and ultrasonic attenuation of a steel depend on many variables including grain size, microstructure, inclusion content and heat treatment. The aim of this research is thus to ascertain on three steels the correlations existing between mechanical parameters and ultrasonic attenuation, so as to develop a non-destructive testing method for determining fracture toughness indices. An ultrasonic index has been found for direct NDT estimation of the fracture toughness of steels. Direct correlations have been found between u.s. attenuation and K(IC), FATT and KV values (transition temperature and shelf energy of Charpy-V curve). A direct correlation has also been found between fracture toughness indices and grain size. To obtain these results, a new method was developed for measuring ultrasonic attenuation at room temperature on thin specimens, even at high absorption.

Additional information

Authors: CANELLA G, CENTRO SVILUPPO MATERIALI S.P.A., ROMA (IT);TADDEI M CENTRO SVILUPPO MATERIALI S.P.A., ROMA (IT), CENTRO SVILUPPO MATERIALI S.P.A., ROMA (IT)
Bibliographic Reference: EUR 12173 IT (1990) 107 PP., MF, ECU 8 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
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