A method for quantitatively characterizing the grain size of the main phase structure of multiphase materials
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A technique for quantitative characterization, grain size, used in the analysis of materials, material analysis using wave/particle radiation, measurement devices, etc.
Active Publication Date: 2021-02-19
SHOUGANG CORPORATION
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[0007] The purpose of the present invention is to provide a method for quantitatively characterizing the grain size of the main phase structure of the multi-phase material, which solves the problem of sample preparation of the multi-phase material relative to the single structure
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Embodiment 1
[0023] In this example, a sample of 20# steel hot-rolled plate is prepared, and the EBSD surface scanning data is obtained by scanning electron microscope observation, and the main phase grain analysis is performed on the scanned area on the basis of phase composition analysis. The specific technical steps are:
[0024] 1. Preparation of Specimen
[0025] 1.1 Cut and grind the sample:
[0026] A precision cutting machine is used to cut out the sample to be tested; a mechanical grinding machine is used to grind the sample, and the sandpaper is ground from coarse to fine to No. 1500, and water is used as lubrication and removal of pollutants.
[0027] 1.2 Mechanical polishing:
[0028] A mechanical polishing machine is used, the wetting agent is water, and the polishing abrasive is artificial diamond polishing agent, and low-speed polishing can reduce stress.
[0029] 1.3 Electropolishing
[0030] Referring to Table A.1 of YB / T4377-2014, the formula and conditions of use of ...
Embodiment 2
[0050] In this embodiment, a sample is prepared for 16Mn steel, the structure is observed with a scanning electron microscope, EBSD surface scanning data is obtained, and the grain size quantitative analysis of the scanned area is performed on the basis of phase composition analysis.
[0051] The specific technical steps are:
[0052] Steps 1 and 2 are performed in the same manner as in Example 1.
[0053] 3. EBSD surface scan data analysis
[0054] 3.1 Removal of noise and mislabeling
[0055] Use Oxford Instruments (Channel 5) data processing module, put this project into the phase analysis interface, use to remove most of the noise points, first remove singular points, and then use to remove noise points to get a complete surface scan result.
[0056] 3.2 Phase analysis
[0057] Through the comparison of the diffraction contrast image and the scanning image, in the diffraction contrast image such as figure 2 Find the diffraction contrast range corresponding to pearlite...
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Abstract
The invention discloses a method for quantitatively characterizing the grain size of the main phase structure of a multi-phase material, which belongs to the technical field of physical performance inspection of metal materials. Through the preparation of the sample, a cross-sectional sample with a microcosmic difference between the main phase structure and the second phase structure is obtained; then the EBSD surface scan is performed, and the calibration rate of the main phase structure is higher than 90%, and the calibration rate of the second phase is lower than 10%, even No diffraction pattern; finally analyze the EBSD surface scanning data, remove mislabeled points, singular points and noise points in the scanning results, and then set the calibrated data points of the second phase as zero solutions by removing small grains, or use The second corresponding contrast range in the diffraction contrast diagram is set as the zero solution, and then the noise removal process is repeated to conduct quantitative analysis on the grains of the main phase structure. The advantage is that it can not only clearly and intuitively display the microscopic morphology of the main phase grains of the multiphase material, but also quantitatively characterize the grain size.
Description
technical field [0001] The invention belongs to the technical field of metal material physical performance inspection, and in particular relates to a method for quantitatively characterizing the grain size of the main phase structure of a multiphase material. In particular, it relates to a method for quantitatively characterizing the grain size of the main phase structure of a multiphase material by using EBSD. Background technique [0002] For the two-phase structure of multi-phase materials, hypoeutectoid steel is taken as an example. The two-phase structure of ferrite and pearlite is obtained in the hot-rolled state. Generally, the main phase ferrite grains are evaluated by optical microscope after metallographic etching. Ferrite grains are graded by using the method, the grade difference is half grade, and the grain size results are discontinuous grades; the imager is mostly used for quantitative analysis of structure or inclusions, but there is no relevant report on aut...
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