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Indexed by:期刊论文

Date of Publication:2022-07-03

Journal:无损检测

Affiliation of Author(s):材料科学与工程学院

Issue:2

Page Number:1-4

ISSN No.:1000-6656

Abstract:Over-spheroidization of pearlite will cause the degradation of material mechanical properties,whereas the conventional linear ultrasonic testing is not sensitive to this microstructure change.To achieve different spheroidization states of pearlite,different heat treatment profiles were applied to T8 steel samples.The nonlinear coefficientβwas measured correspondingly by the experimental system.Results showed that there was no notable change in ultrasonic velocity and attenuation coefficient with the increase of the spheroidization degree of pearlite. However,the nonlinear coefficient β showed a significant increase and it can be used to characterize the microstructure evolution of the material.

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