Method of determining grain size using ultrasonic waves

Details Method of determining grain size using ultrasonic waves Method of determining grain size using ultrasonic waves

1984-07-25

1985-09-10

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73602, G01N 2900

Patent

active

045398488

ABSTRACT:
The grain size is expressed by the diameter of grains demarcated at high-angle grain boundaries, such as ferrite grains in ferritic steels. Ultrasonic waves having a frequency f are propagated through an object to be examined and its attenuation constant .alpha. is determined. Using the ratio f/.alpha. and equation

REFERENCES:
patent: 4026157 (1977-05-01), Goebbels
patent: 4165649 (1979-08-01), Greer, Jr.
Conference Report, "Eighth World Conference on Nondestructive Testing", section 3F, Quantitative Determination of Grain Sizes by means of Scattered Ultrasound, pp. 1-7, Sep. 9, 1976.
R. Klinman et al., "Ultrasonic Prediction of Grain Size, Strength, and Toughness in Plain Carbon Steel," Materials Evaluation, pp. 26-32, Oct. 1980.
N. M. Bilgutay et al., "The Effect of Grain Size on Flaw Visibility Enhancement Using Split-Spectrum Processing," Materials Evaluation, pp. 808-814, May 1984.

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