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论文类型：会议论文

发表时间：2003-11-03

收录刊物：EI

卷号：270-273

期号：I

页面范围：346-352

摘要：Ultrasonic characterization of 38CrMoAl samples suffered from different heat treatment processes was studied with ultrasonic velocity, relative attenuation coefficient, and power spectral analysis, respectively. The velocity of quenched microstructure is the lowest, which gradually increases with increasing tempering temperature between 200°c and 650°c after quenching process. There was a good correlation between hardness and the velocity. The velocity of normalized structure is between the velocity in medium and high temperature tempering products after quenching. The relative attenuation coefficient of quenched plus low tempered samples was the lowest and that of normalized samples was the highest. Quenched plus high tempered structures own the different law with the change of frequency. Ultrasonic power spectral technique with 1MHz central frequency was used to differentiate the above-mentioned samples. There were obvious differences in quantity, amplitude, and distribution of spectral peaks among different heat treatment products. The results of three ultrasonic methods have shown that the velocity and relative attenuation coefficient can characterize partial transformation products respectively, while the power spectral analysis could be used to differentiate all the four heat treatment samples.