Semi-automatic for ultrasonic measurement of texture
AssigneeIowa State University Research Foundation, Inc.
InventorsR. Bruce Thompson, John F. Smith, Seung S. Lee, Yan Li
Life of this patent
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Abstract
A method for measuring texture of metal plates or sheets using non-destructive ultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed. Texture or preferred grain orientation can be derived from these measurements with improved reliability and accuracy. The method can be utilized in production on moving metal plate or sheet.
Claims29
A method for measuring texture of polycrystals of various crystallite symmetries, using non-destructive ultrasonic investigation of the material, comprising the steps of:
- measuring the velocity of ultrasonic energy waves of low order modes of the material in one or more directions;
- measuring velocity dispersion of higher order modes of the material;
- and
- deriving texture characteristics from said measurements of velocity and said velocity dispersion.
The method for measuring texture of materials of crystal symmetry using non-destructive ultrasonic investigation of the material, comprising the steps of:
- imposing ultrasonic energy waves into and through the material;
- measuring the velocity said of ultrasonic energy waves of low order modes of the material in one or more directions;
- selecting one or more of the following steps;
- measuring velocity dispersion of higher order modes of the material;
- plotting the dispersion curves of higher order plate modes, and analyzing their orientation to one another;
- and
- to derive texture characteristics said from measurements of velocity said and velocity dispersion.
A method for measuring texture of materials of crystal symmetry using non-destructive ultrasonic investigation of the material, comprising the steps of:
- imposing ultrasonic energy waves into and through the material;
- measuring the velocity of ultrasonic energy waves of low order modes of the material in one or more directions;
- selecting one or more of the following steps;
- measuring velocity dispersion of higher order modes of the material;
- plotting the dispersion curves of higher order plate modes, and analyzing their orientation to one another;
- deriving coefficients W.sub.400, W.sub.420 and W.sub.440 from velocity measurements;
- deriving coefficients W.sub.420 and W.sub.440 by velocity measurements and a comparison of angular dependencies of those measurements in low order modes of the material, and coefficient W.sub.400 from measurements of dispersion of higher order modes of the material if the thickness of the material is precisely known.
A method for measuring texture of materials of crystal symmetry using non-destructive ultrasonic investigation of the material, comprising the steps of:
- imposing ultrasonic energy waves into and through the material;
- measuring the velocity of ultrasonic energy waves of low order modes of the material in one or more directions;
- selecting one or more of the following steps;
- measuring velocity dispersion of higher order modes of the material;
- plotting the dispersion curves of higher order plate modes, and analyzing their orientation to one another;
- deriving coefficients W.sub.400, W.sub.420 and W.sub.440 from velocity measurements;
- deriving coefficients W.sub.420 and W.sub.440 by velocity measurements and a comparison of angular dependencies of those measurements, and deriving coefficient W.sub.400 by plotting dispersion curves for higher order modes of the material, without precise knowledge of the thickness of the material.
Dependencies are inferred from the claim text.