Method for establishing FDTD (Finite Difference Time Domain) ultrasonic detection simulation model of coarse crystal material based on EBSD (Electron Back-Scattered Diffraction) spectrum
A simulation model and method establishment technology, which is applied to the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, measurement devices, etc., can solve problems such as grain structure and orientation distortion, and affect model calculation accuracy
Active Publication Date: 2014-10-08
DALIAN UNIV OF TECH +1
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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
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[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 an FDTD (Finite Difference Time Domain) ultrasonic detection simulation model of a coarse crystal material based on an EBSD (Electron Back-Scattered Diffraction) spectrum and belongs to the technical field of ultrasonic nondestructive detection. The method comprises the following steps: obtaining a crystal orientation spectrum of the coarse crystal material by directly using the EBSD technology, selecting a threshold value for defining crystal grains in the spectrum according to an actual crystal grain structure in a macroscopic metallograph, packing the crystal grains with color corresponding to a principal orientation, and carrying out grey processing to obtain an image consisting of square pixel points, wherein the orientations of the crystal grains are represented by eulerian angles phi1, phi and phi2 corresponding to gray values and can be used for quantitatively calculating elastic anisotropic stiffness matrixes of the crystal grains. Compared with a previous model, the model has the advantages of being capable of accurately describing the structures and the orientations of the crystal grains, realizing high operation efficiency and the like; a model basis is provided for realizing purposes of defect quantification and location and quality determination in ultrasonic detection of the coarse crystal material. The method also can be used for establishing the ultrasonic simulation models of other elastic anisotropic polycrystalline materials such as austenitic welding lines and two-phase titanium alloys; the method has bright popularization 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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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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