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介绍测量超声波声速的意义、淬火温度及时间和回火温度对声速的影响。分析了各试样的显微组织 ,淬火和回火工艺影响声速的机理
Describe the significance of measuring the speed of ultrasonic sound, quenching temperature and time and tempering temperature on the sound velocity. The microstructure of each sample, the mechanism of quenching and tempering process affecting sound velocity were analyzed