Method and device for measuring metal pipe texture

A technology of metal pipes and the same metal, applied in the preparation of test samples, material analysis using radiation diffraction, etc., can solve the problem that the influence of diffraction intensity cannot be corrected

Active Publication Date: 2012-10-10
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to provide a direct measurement method for measuring the texture of a metal pipe with a curved surface shape, that is, to use the same kind of metal powder without texture with the same radius of curvature as the surface of the pipe without damage and maintaining the original state of the surface Standard sample, correcting the influence of defocus and surface shape on the X-ray diffraction intensity, accurately measuring the variation of the diffraction intensity produced by the internal crystal structure of the tube with the spatial orientation, it overcomes the difficulty that the influence of the shape of the curved surface sample on the X-ray diffraction intensity cannot be corrected, Realize direct and accurate measurement of pipe texture, effectively solve the problem of texture measurement of curved surface materials, simplify operation steps, and improve test accuracy and efficiency

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  • Method and device for measuring metal pipe texture
  • Method and device for measuring metal pipe texture

Examples

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Effect test

Embodiment 1

[0028] Texture determination of titanium alloy pipe: the outer diameter of the titanium alloy pipe sample is 16mm, and the wall thickness is 0.9mm. The non-textured standard sample is titanium powder below 600 mesh, with a purity of 99.8%. Put the titanium powder into the filling area of ​​the cylindrical sample holder little by little. The projected size of the filling area is 8X15mm, and the depth is 0.5mm. The pipes are the same, and the powder is compacted using a semi-cylindrical die. The surface of the powder standard sample is required to have the same curvature as the pipe material, and it is used as a non-textured standard sample. Using the same test conditions, on the X-ray diffractometer, fix the goniometer on the diffraction direction of the {0002} crystal plane, use the Ula ring reflection method to measure the diffraction intensity of the pipe and the non-textured standard sample, and the tilt angle χ From 0° to 75°, rotation angle From 0° to 360°, the step siz...

Embodiment 2

[0030] Texture determination of titanium alloy pipe: the outer diameter of the titanium alloy pipe sample is 19.050mm, and the wall thickness is 0.991mm. The non-textured standard sample is titanium powder below 600 mesh, with a purity of 99.8%. Put the titanium powder into a cylindrical molding mold little by little. The diameter of the mold cavity is the same as the outer diameter of the pipe sample, and the pressing pressure is 200MPa. After demolding, the obtained The standard sample is a cylindrical compact with a length of 20 mm and a diameter of 19.050. Using the same test conditions, on the X-ray diffractometer, fix the goniometer on the diffraction direction of the {0002} crystal plane, use the Ula ring reflection method to measure the diffraction intensity of the pipe and the non-textured standard sample, and the tilt angle χ From 0° to 75°, rotation angle From 0° to 360°, the step size is 5°. Plot the {0002} pole figure with corrected strength. Continue to measu...

Embodiment 3

[0032] Determination of the texture of the aluminum alloy pipe: the outer diameter of the cold-rolled aluminum alloy pipe sample is 10mm, and the wall thickness is 3mm. The non-textured standard sample is aluminum powder below 600 mesh, with a purity of 98%. Put the aluminum powder into the filling area of ​​the cylindrical sample holder little by little. The projected size of the filling area is 3X15mm, and the depth is 0.2mm. The pipes are the same, and the powder is compacted using a semi-cylindrical die. The surface of the powder standard sample is required to have the same curvature as the pipe material, and it is used as a non-textured standard sample. Using the same test conditions, on the X-ray diffractometer, fix the goniometer on the diffraction direction of the {110} crystal plane, use the Ula ring reflection method to measure the diffraction intensity of the pipe and the non-textured standard sample, and the tilt angle χ From 0° to 75°, rotation angle From 0° to ...

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Abstract

The invention belongs to measuring technology and relates to the improvement of a method for measuring metal pipe texture. The method comprises the steps of: processing a standard sample rack, compacting metal powder on a columnar sample rack as an amorphous standard sample, drawing a pole figure with an X ray reflection method, measuring different diffracted intensities of a pipe and a standard sample with different tilting angles x and different rotation angles, calibrating relative pole density in the pole figure by using correction intensity after compensation, drawing a pole figure of a certain crystal plane {HKL} of the pipe to obtain a complete pole figure and an orientation distribution function ODF of the texture. The invention assists in solving a problem that impact of curved surface sample shapes on X ray diffraction intensities can not be corrected, and precise measurement of the metal pipe texture is realized.

Description

technical field [0001] The invention relates to a technique for measuring the texture of metal materials, in particular to a texture testing method and device for measuring metal pipes and other materials with curved surfaces. Background technique [0002] Pipelines widely serve various fields of social production and life, and in pipeline engineering, metal pipes occupy an undoubted dominant position. The internal pipeline of the equipment, the instrument pipe and the road isolation railing and many other aspects. [0003] The steel pipe has a hollow cross-section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, when the bending and torsional strength is the same, it is lighter in weight. It is an economical section material and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes...

Claims

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Application Information

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IPC IPC(8): G01N23/20G01N1/36
Inventor 张旺峰王玉会颜孟奇李艳
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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