TY - JOUR
T1 - Evaluating grain size in polycrystals with rough surfaces by corrected ultrasonic attenuation
AU - Li, Xiongbing
AU - Han, Xiaoqin
AU - Arguelles, Andrea P.
AU - Song, Yongfeng
AU - Hu, Hongwei
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51575541 and 61271356).
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - Surface roughness of a sample has a great effect on the calculated grain size when measurements are based on ultrasonic attenuation. Combining modified transmission and reflection coefficients at the rough interface with a Multi-Gaussian beam model of the transducer, a comprehensive correction scheme for the attenuation coefficient is developed. An approximate inverse model of the calculated attenuation, based on Weaver's diffuse scattering theory, is established to evaluate grain size in polycrystals. The experimental results showed that for samples with varying surface roughness and matching microstructures, the fluctuation of evaluated average grain size was ±1.17 μm. For polished samples with different microstructures, the relative errors to optical microscopy were no more than ±3.61%. The presented method provides an effective nondestructive tool for evaluating the grain size in metals with rough surfaces.
AB - Surface roughness of a sample has a great effect on the calculated grain size when measurements are based on ultrasonic attenuation. Combining modified transmission and reflection coefficients at the rough interface with a Multi-Gaussian beam model of the transducer, a comprehensive correction scheme for the attenuation coefficient is developed. An approximate inverse model of the calculated attenuation, based on Weaver's diffuse scattering theory, is established to evaluate grain size in polycrystals. The experimental results showed that for samples with varying surface roughness and matching microstructures, the fluctuation of evaluated average grain size was ±1.17 μm. For polished samples with different microstructures, the relative errors to optical microscopy were no more than ±3.61%. The presented method provides an effective nondestructive tool for evaluating the grain size in metals with rough surfaces.
UR - http://www.scopus.com/inward/record.url?scp=85014727118&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85014727118&partnerID=8YFLogxK
U2 - 10.1016/j.ultras.2017.02.018
DO - 10.1016/j.ultras.2017.02.018
M3 - Article
C2 - 28282635
AN - SCOPUS:85014727118
SN - 0041-624X
VL - 78
SP - 23
EP - 29
JO - Ultrasonics
JF - Ultrasonics
ER -