Establishment method of simulation model for fdtd ultrasonic testing of coarse-grained materials based on ebsd map

A simulation model and method establishment technology, which is applied in the analysis of materials, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measurement devices, and can solve problems that affect model calculation accuracy, grain structure, and orientation distortion.

Active Publication Date: 2016-06-15
DALIAN UNIV OF TECH +1
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Problems solved by technology

If the above simplified method is adopted, the grain structure and orientation will be seriously distorted, which will affect the calculation accuracy of the model

Method used

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  • Establishment method of simulation model for fdtd ultrasonic testing of coarse-grained materials based on ebsd map
  • Establishment method of simulation model for fdtd ultrasonic testing of coarse-grained materials based on ebsd map
  • Establishment method of simulation model for fdtd ultrasonic testing of coarse-grained materials based on ebsd map

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Embodiment Construction

[0032] The establishment method of FDTD ultrasonic testing simulation model for coarse-grained materials based on EBSD maps, taking the Z3CN20-09M main pipeline material of a pressurized water reactor nuclear power plant with a thickness of 96mm as an example, includes the following steps:

[0033] (1) Taking Z3CN20-09M with a thickness of 96mm as the research object, cut a sample of 96mm×12mm×2mm along the pipeline axis-radial direction, and then cut the sample into four pieces of 24mm×12mm×2mm for EBSD analysis, and the rest with Time-domain waveforms for ultrasonic testing. According to the national standard "GB / T19501-2004 General Principles of Electron Backscatter Diffraction Analysis Method", the samples were pretreated by grinding, mechanical polishing, and stress-relieving electrolytic polishing. Select 40μm scan step to perform EBSD analysis on the sample to be tested;

[0034] (2) As a microscopic measurement tool, EBSD can only scan 6mm at a time 2 Areas need to b...

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Abstract

The invention discloses a method for establishing a simulation model of FDTD ultrasonic detection of coarse-grained materials based on an EBSD map, and belongs to the technical field of ultrasonic nondestructive testing. The steps are: after obtaining the crystal orientation map of the coarse-grained material directly by EBSD technology, according to the actual grain structure in the macroscopic metallographic photograph, select the threshold angle to define the grains in the map, and align the grains with the color corresponding to the main orientation. Fill and obtain an image composed of square pixels through grayscale processing. The grain orientation is represented by the Euler angles corresponding to the gray value Φ, Indicates that it is used to quantitatively calculate the elastic anisotropic stiffness matrix of grains. Compared with previous models, this model has the advantages of accurate description of grain structure and grain orientation, high calculation efficiency, etc., and provides a model basis for solving the problems of defect quantification, location and qualitative in ultrasonic testing of coarse-grained materials. The invention can also be extended to the establishment of ultrasonic simulation models of other elastic anisotropic polycrystalline materials such as austenitic welds and duplex titanium alloys, and has good promotion and application prospects.

Description

technical field [0001] The invention relates to a method for establishing an FDTD ultrasonic detection simulation model of a coarse-grained material based on an EBSD spectrum, in particular to the technical field of ultrasonic nondestructive testing. Background technique [0002] Coarse-grained materials such as austenitic stainless steel are widely used in nuclear power and chemical industries, and their safety has attracted much attention. Due to the complex coarse grain structure and grain orientation, this kind of material has strong elastic anisotropy, which leads to serious beam deflection, structural noise, signal distortion and other phenomena in the process of ultrasonic nondestructive testing, making it difficult to accurately locate defects , quantitative and qualitative. [0003] In order to solve the above problems, researchers in this field try to establish corresponding ultrasonic testing simulation models, and describe the interaction between ultrasonic wave...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/30
Inventor 雷明凯赵天伟陈尧张东辉林莉杨会敏罗忠兵严宇周全刘丽丽
Owner DALIAN UNIV OF TECH
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