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http://dx.doi.org/10.9726/kspse.2013.17.4.072

Ultrasonic Characteristics of Degraded Compacted Graphite Iron from 873 to 1,273 K  

Lee, Soo-Chul (UR Interdisciplinary Program of Mechanical Engineering, Graduate School, Pukyong National University)
Nam, Ki-Woo (Department of Materials Science and Engineering, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.17, no.4, 2013 , pp. 72-78 More about this Journal
Abstract
Compacted graphite iron 340 was carried out the heat treatment from 873 to 1,273 K. Compacted graphite iron 340 was evaluated relationship between the sound velocity, the attenuation coefficient and the tensile strength. The obtained results are as following. The signal strength of C scan images were weak according to increasing of heat treatment temperature and time. The amplitude of A scan and B scan was also low. This can be cause that the graphite was grown into the type of vermicular, and the many of grain boundary with ultrasound scattering were increase. The sound velocity was depend upon the heat treatment temperature and time, the attenuation coefficient had nothing to do with the temperature and time. The higher the heat treatment temperature, the tensile strength and the sound velocity were decreased. However, the tensile strength was proportional to the sound velocity. The higher tensile strength, the faster the sound velocity.
Keywords
Diesel engine; Compacted graphite iron; Heat treatment; Sound velocity; Attenuation coefficient; Vermicular;
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Times Cited By KSCI : 5  (Citation Analysis)
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