Method for detecting residual stress of amorphous coating
A technology of amorphous coating and residual stress, which is applied in the direction of force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problem that the residual stress of amorphous coating cannot be detected, and achieve the control of detection position and depth, test The effect of high precision and simple preparation process
Active Publication Date: 2017-08-11
ACADEMY OF ARMORED FORCES ENG PLA
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[0005] In view of this, the present invention provides a method for detecting the residual stress of an amorphous coating to solve the problem that the internal residual stress of the amorphous coating cannot be detected in the prior art
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[0058]In some residual stress detection methods in the prior art, for example, the X-ray method mainly detects the residual stress of crystal materials; for example, when the mechanical destruction method is used to measure the residual stress of structural parts, it is necessary to paste strain gauges on the surface of the sample to be tested, so as to Calculates the displacement that occurs after material removal. For the amorphous coating, its thickness generally does not exceed 500 μm, and it is not suitable to use strain gauges in terms of size and precision; and the toughness of the coating is poor. If it is destroyed by mechanical methods, a large number of Cracks release residual stress, thus affecting the final test results. That is, none of the residual stress detection methods in the prior art is suitable for the detection of the residual stress of the amorphous coating.
[0059] Based on this, the present invention provides a method for detecting residual stress o...
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Abstract
The invention provides a method for detecting a residual stress of an amorphous coating. The method comprises the steps of supplying an amorphous coating testing sample; manufacturing a lattice on the to-be-tested area of the amorphous coating testing sample; acquiring a first morphological image of the to-be-measured area; performing layer-by-layer eliminating on a material which surrounds the to-be-measured area, and acquiring the morphological image of the to-be-measured area after each material layer is eliminated; obtaining a displacement amount of each point in the to-be-measured area lattice after each material layer is eliminated according to the first morphological image and the morphological image of the to-be-measured area after each material layer is eliminated; and calculating the residual stress of the to-be-measured area after each material layer is eliminated according to the displacement amount of each point in the lattice. Through eliminating the material at the periphery of the to-be-measured area in a layer-by-layer manner, the residual stress is released. Then the residual stress of the to-be-measured area after the surrounding material is eliminated is calculated, thereby realizing detection for the residual stresses at different depths in the amorphous coating. Furthermore the residual stress in the amorphous coating is detected.
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 an amorphous 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. [0003] Due to the rapid solidification of the sprayed particles during the preparation of the coating, a large residual stress will be generated, which will greatly reduce the bonding strength between the coating and the substrate. Excessive stress directly leads to debonding and falling b...
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IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 马国政王海斗陈书赢何鹏飞王译文赵钦刘喆徐滨士
Owner ACADEMY OF ARMORED FORCES ENG PLA