Increasing the precision of measurements of the velocity of acoustic vibrations in ultrasonic analysis of cast-iron articles

Kachanov, V. K.; Соколов, И. В.; Kontsov, R. V.; Voronkova, L. V.

doi:10.1007/s11018-012-9877-2

Cited by 2 publications

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“…The calculated results according to equation (8) were also shown in Table 1. It can be seen the coef cient of variation is below 0.3%, which indicates the repeatability of the system is very good.…”

Section: )mentioning

confidence: 99%

“…However, most of the ultrasonic probes must be directly contacted with the detected specimen, and only when the distance of the ultrasonic propagation directing to the specimen was accurately measured, the ultrasonic velocity could be calculated. [7][8][9] In fact, the length of the detected specimen is often different, which will bring some dif culties to detect the vermicular graphite percent.…”

Section: Introductionmentioning

confidence: 99%

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System and Experiment on Fast Testing Vermicular Graphite Percent in Cast Iron Based on Ultrasonic Longitudinal Wave

et al. 2016

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Vermicular graphite percent is an important index of evaluating the vermiculation of graphite in cast iron. Quantitative metallographic method is commonly used to test the vermicular graphite percent, but it can only detect certain parts of the cast iron specimen. Therefore, an ultrasonic system was designed to detect the degree of the vermiculation in cast iron according to the relationship between the ultrasonic propagation velocity and the vermicular graphite percent, and it is composed of the sink lled with ultrasonic coupling agent, ultrasonic emitting probe, ultrasonic receiving probe, high-frequency signal generator, ultrasonic signal acquisition unit and computer. Without measuring the length of the cast iron specimen, the propagation velocity can be calculated by three different kinds of propagation time. A speci c relation between the vermicular graphite percent η and the propagation velocity ν was got by experiments. When the propagation velocity is below 5700 m s , they have a linear relationship, namely η = −v/1.53 + 5800/1.53. The comparative experiments showed that the coef cient of variation and the error were below 0.3% and 4%, respectively, which indicated the repeatability and accuracy of the system are very good.

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Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%