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The ultrasonic method was used to detect vermicular graphite ratio according to the relationship between them. However, there is little report how the factors affect the vermicular graphite ratio detection and ultrasonic velocity measurement. In this paper, using ECHOMETER1076 ultrasonic tester, stylus surface roughness tester and quantitative metallography, the influences of sample two-plane parallelism, probe incident angle, coupling agent type, surface roughness and matrix on the ultrasonic velocity were further studied by experiments and simulation. The parallelism and probe incident angle were found to have important influence on the ultrasonic velocity, increasing more than 4.58m/s every 0.1°. Contrarily, the influence of coupling agent, surface roughness less than 5 and pearlite percentage were little, and even neglected. So, the parallelism and probe incident angle must be kept as small as possible and the surface roughness is not more than 5. This provide a basis for accurately measuring the ultrasonic velocity and predicting the vermiculate graphite ratio. [doi:10.2320/matertrans.M2018083]

Influence Factors for the Determination of Vermicular Graphite Ratio in Cast Iron Measured by Ultrasonic Method