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http://dx.doi.org/10.12656/jksht.2019.32.3.118

Nondestructive Evaluation for Long-term Heat Treatment Effects on Microstructure of Co-base Superalloy by Scanning Acoustic Microscope  

lEE, JoonHee (Dep. of Advanced material and Engineering, Chosun University)
Kim, ChungSeok (Dep. of Materials Science and Engineering, Chosun University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.32, no.3, 2019 , pp. 118-123 More about this Journal
Abstract
The aim of this study investigates the feasibility of scanning acoustic microscope (SAM) with high frequency transducer for material degradation. The test specimen was prepared by artificial heat treatment of Co-base superalloy. The high frequency 200 MHz acoustic lens was used to generate the leaky surface acoustic wave (LSAW) on the test specimens. The matrix precipitates coarsened with thermal aging time, and then grow up to several tens of micrometers. The velocity of LSAW decreased with increasing aging time. Also, it has a good correlation between LSAW and hardness. Consequently, V(z) curve methods of SAM using high frequency transducer is useful tool to evaluate the heat treatment effects on microstructure.
Keywords
Nondestructive evaluation; Heat treatment; Scanning acoustic microscope; Surface wave;
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