Feasibility Study of Grain Size Estimation of S45C by Attenuation Measurement of 40 MHz Surface Acoustic Wave Generated by Phase Velocity Scanning of Laser Interference Fringes

Structural change in 0.45 mass % carbon steel during tempering was measured nondestructively as a change in the attenuation coefficient of 40 MHz surface acoustic waves (SAW) generated by scanning interference fringes (SIF). The SIF selectively generate the SAW at an adequate center frequency, which...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2000, Vol.39 (5S), p.3154
Main Authors: Nishino, Hideo, Furukawa, Tsutomu, Takashina, Sunao, Takemoto, Mikio
Format: Article
Language:English
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Summary:Structural change in 0.45 mass % carbon steel during tempering was measured nondestructively as a change in the attenuation coefficient of 40 MHz surface acoustic waves (SAW) generated by scanning interference fringes (SIF). The SIF selectively generate the SAW at an adequate center frequency, which is useful to distinguish the attenuation coefficients between slightly different structures. The attenuation coefficient at 40 MHz increased linearly with heating time (30, 60 and 90 min) at 750°C, representing a minute change in the structure of ferrite and pearlite grains. The method revealed a minute structural change in the ferrite-pearlite ratio and in grain size growth due to the heat treatment.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.39.3154