The ultrasonic velocity in 20~# steel graphitized specimens is measured in order to determine the possibility of ultrasonic evaluating graphitization in low-carbon steel.
研究结果表明:随着石墨化程度的加剧,超声波速度随时效时间按照指数规律递减。
On line Measurement of the Concentration of Strong Acid by Using Ultrasonic Velocity;
由于强酸中超声波速度在一定浓度上存在着极值现象，因此超声波测量溶液浓度的技术只适用于某些浓度范围。
