Nondestructive method and apparatus for imaging grains in curved surfaces of polycrystalline articles

Patent · 01 January 1995

OSTI ID:869897

Carpenter, Donald A ^[1]

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1. Lenior City, TN

A nondestructive method, and associated apparatus, are provided for determining the grain flow of the grains in a convex curved, textured polycrystalline surface. The convex, curved surface of a polycrystalline article is aligned in a horizontal x-ray diffractometer and a monochromatic, converging x-ray beam is directed onto the curved surface of the polycrystalline article so that the converging x-ray beam is diffracted by crystallographic planes of the grains in the polycrystalline article. The diffracted x-ray beam is caused to pass through a set of horizontal, parallel slits to limit the height of the beam and thereafter. The linear intensity of the diffracted x-ray is measured, using a linear position sensitive proportional counter, as a function of position in a direction orthogonal to the counter so as to generate two dimensional data. An image of the grains in the curved surface of the polycrystalline article is provided based on the two-dimensional data.

• Research Organization: LOCKHEED MARTIN ENRGY SYST INC
• DOE Contract Number: AC05-84OR21400
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 5418828
• OSTI ID: 869897
• Country of Publication: United States
• Language: English

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aligned
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converging
convex
counter
crystallographic
curved
curved surface
curved surfaces
data
determining
diffracted
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dimensional
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directed
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function
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image
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intensity
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nondestructive method
orthogonal
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position
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sensitive proportional
set
slits
surface
surfaces
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two-dimensional
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x-ray beam
x-ray diffractometer