Multiphase composite coating residual stress detection method
A composite coating and residual stress technology, applied in the direction of force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problem of inability to detect the residual stress of multi-phase composite coatings, achieve accurate positioning, simple preparation process, The effect of high test accuracy
Active Publication Date: 2017-08-04
ACADEMY OF ARMORED FORCES ENG PLA
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[0005] In view of this, the present invention provides a multiphase composite coating residual stress detection method to solve the problem that the multiphase composite coating residual stress cannot be detected in the prior art
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[0053]In some residual stress detection methods in the prior art, such as the curvature method, the average value of the residual stress of the entire coating is generally measured, and different phases cannot be distinguished; the test area of the X-ray method is relatively small, but its test accuracy It is still impossible to select and distinguish the phases inside the coating.
[0054] Based on this, the present invention provides a method for detecting residual stress of a multiphase composite coating, comprising:
[0055] Provide multi-phase composite coating test samples;
[0056] Select the area to be measured on the multiphase composite coating test sample, and make a lattice on the area to be measured;
[0057] Acquiring a first topographical image of the region to be measured;
[0058] removing material surrounding the area to be measured, and acquiring a second topographical image of the area to be measured after material removal;
[0059] Acquiring the displ...
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Abstract
The present invention provides a multiphase composite coating residual stress detection method. The method includes the following steps that: a region to be measured is selected from a multiphase composite coating test sample, and a point matrix is fabricated on the region to be measured; the first shape image of the region to be measured is obtained; materials surrounding the region to be measured are removed, and the second shape image of the region to be measured after the materials are removed is obtained; the displacement amount of each point in the point matrix is obtained according to the first shape image and the second shape image; and the residual stress of the region to be measured is calculated according to the displacement amount of each point in the point matrix. With the multiphase composite coating residual stress detection method of the invention, different physical phases can be accurately distinguished in a micro-scale, and residual stress corresponding to the physical phases are measured, and therefore, the selection and distinguished of physical phases in a multiphase composite coating can be realized; the materials surrounding the multiphase composite coating are removed, strain caused by the release of the residual stress can be obtained through analysis; and therefore, the residual stress of a single-phase matter in the multiphase composite coating can be measured.
Description
technical field [0001] The invention relates to the technical field of residual stress detection, in particular to a method for detecting residual stress of a multiphase composite coating. Background technique [0002] In recent years, as an important material surface damage repair and performance enhancement technology, thermal spraying technology has been widely used in aerospace, marine ships, mining machinery, military equipment and other fields. With the rapid development of spraying technology and the increasing variety of spraying materials, composite coatings with high toughness, high hardness or other properties have gradually become an important part of thermal spraying coating systems. The so-called composite coating is to prepare two or more materials into a spray powder through a variety of processes such as agglomeration, sintering, and crushing, and then prepare the coating through a thermal spraying process. Contains a variety of phase structures with differ...
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IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 王海斗马国政陈书赢何鹏飞邢志国赵钦王译文徐滨士
Owner ACADEMY OF ARMORED FORCES ENG PLA