A Method for Detection of Residual Stress of Solidification Spots
A technology of residual stress and detection method, applied in the direction of force/torque/work measuring instrument, measuring device, instrument, etc., can solve the problem of inability to detect residual stress of solidification spots, etc., achieve accurate control, high test accuracy, and simplify the detection process Effect
Active Publication Date: 2020-08-28
ACADEMY OF ARMORED FORCES ENG PLA
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[0004] In view of this, the present invention provides a method for detecting residual stress of solidification spots to solve the problem that the residual stress of solidification spots cannot be detected in the prior art
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[0052] In some residual stress detection methods in the prior art, such as X-ray and neutron diffraction methods, the depth of residual stress in materials is much greater than 5 μm, and generally speaking, the thickness of solidification spots is less than 4 μm, so the above two methods are selected When measuring the residual stress of the solidification spot, the influence of the residual stress of the matrix cannot be avoided. To measure the stress of solidification spots, you first need to find the position to be measured. However, since the distribution of solidification spots on the surface of the substrate is random, spaced apart from each other, and the size is very small, this process usually needs to be completed under a high-power microscope. However, the current detection equipment related to X-ray, neutron diffraction, and curvature method is to measure the stress on the surface of homogeneous materials, and it is difficult to locate the solidification spots. The...
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Abstract
The invention provides a residual stress testing method for a solidified spot. The method comprises the steps of supplying a solidified spot testing sample; manufacturing a lattice on the to-be-tested area of the solidified spot testing sample; acquiring a first morphological image of the to-be-tested area; performing layer-by-layer eliminating on the material which surrounds the to-be-tested area, and acquiring a morphological image of the to-be-tested area after each material layer is eliminated; according to the first morphological image and the morphological image of the to-be-tested area after each material layer is eliminated, acquiring the displacement amount of each point in the lattice of the to-be-tested area after each material layer is eliminated; and according to the displacement amount of each point in the lattice, calculating the residual stress of the to-be-tested area after each material layer is eliminated. Through eliminating the material which surrounds the to-be-tested area in a layer-by-layer manner, the residual stress is released; and then the residual stress of the to-be-tested area after the surrounding material is eliminated is calculated, thereby realizing testing for the residual stresses at different depths in a solidified spot, and furthermore measuring the residual stress of the solidified spot.
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 solidification spots. Background technique [0002] Residual stress is an important factor affecting the performance of plasma sprayed coatings, such as the bonding strength of the coating, rolling contact fatigue life, etc. Therefore, it is necessary to effectively control and detect the residual stress of the coating during the coating preparation process. In essence, a thermal spray coating is formed by a large number of droplets rapidly hitting the substrate, spreading and cooling, and overlapping and stacking layer by layer. Therefore, a single solidification spot can be regarded as the most basic unit of coating formation. The magnitude of the residual stress of a single solidification spot can largely determine the magnitude of the residual stress after the coating is formed. [0003] The current solidification s...
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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