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论文类型：期刊论文

发表时间：2022-07-03

发表刊物：无损检测

所属单位：材料科学与工程学院

期号：2

页面范围：1-4

ISSN号：1000-6656

摘要：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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