A correction method for array ultrasonic focusing imaging of heterogeneous tissue in metal additive manufacturing
A metal additive and ultrasonic focusing technology, which is applied in the direction of using sonic/ultrasonic/infrasonic waves for material analysis, material analysis, and processing of detected response signals, which can solve the failure of traditional array ultrasonic focusing methods, defect high-resolution imaging detection, phase Distortion, etc.
Active Publication Date: 2021-07-20
WUHAN UNIV
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[0004] The purpose of the present invention is to provide an array ultrasonic focus imaging correction method for metal additively manufactured heterogeneous tissue, to solve the problem caused by the abnormal time delay and phase distortion of the ultrasonic signal generated by the additively heterogeneous tissue. The problem of failure of the ultrasonic focusing method, and finally realize the high-resolution imaging detection of internal defects of additive parts
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Embodiment 1
[0031] A method for correcting arrayed ultrasonic focus imaging of heterogeneous tissue by metal additive manufacturing, the steps of which include:
[0032] S1. Construct the spatial structure model of the heterogeneous medium:
[0033] Using the laser direct energy deposition additive method to print a certain thickness of stainless steel additive parts samples, cut a certain length of samples along the printing growth direction of the additive parts samples, and use the electron backscatter diffraction technique (EBSD) to obtain the crystal Grain orientation distribution map, set the area with similar grain orientation as a homogeneous area, as a homogeneous layer, measure the layer thickness d and grain tilt angle α of each homogeneous layer i (i=1, 2...N, N is the total number of layers), construct a spatial structure model composed of the layer thickness of the homogeneous layer and the angle of grain inclination, such as figure 1 shown;
[0034] S2. Measure the elasti...
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The invention discloses an array ultrasonic focusing imaging correction method for metal additively manufactured heterogeneous tissue. The steps include: constructing a spatial structure model of a heterogeneous medium; measuring the elastic constant of a transversely isotropic structure; using X-rays Diffraction calibration method measures the 5 elastic constants of the transverse isotropy of the sample to form the elastic matrix C; sets the initial angle of ultrasonic incidence at the position of the first array element of the array ultrasound; calculates the sound ray termination point F' of the focal plane along the direction; Reversely calculate the end point P' of the sound ray on the plane of the excitation position; cyclically calculate the sound propagation time between the excitation point and the focus point; calculate the array ultrasound time-delay matrix; superimpose the ultrasonic signal according to the delay matrix to obtain a modified focus image. The invention can solve the failure problem of the traditional array ultrasonic focusing method caused by the signal phase distortion caused by the heterogeneous tissue of the additive material, and realize the high-resolution imaging detection of the internal defect of the additive material product.
Description
technical field [0001] The invention belongs to the field of printing detection and relates to an ultrasonic array focused imaging technology, in particular to an array ultrasonic focused imaging correction method for metal additive manufacturing of heterogeneous tissues. Background technique [0002] Metal additive manufacturing is a transformative and core technology for advanced manufacturing and smart manufacturing. The reciprocating cycle characteristics of "point-by-point scanning / layer-by-layer accumulation" of metal additive manufacturing inevitably produce various special process defects that are different from traditional manufacturing. The lack of quality inspection methods in the additive manufacturing process has become a major bottleneck restricting its technological development and promotion and application. [0003] Array ultrasonic testing technologies include laser phased array ultrasonic, piezoelectric phased array ultrasonic and fully focused ultrasonic,...
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IPC IPC(8): G01N29/44
CPCG01N29/4463
Inventor 张俊李晓红杨兵丁辉
Owner WUHAN UNIV