Method for quantitatively characterizing grain size of main phase structure of complex phase material
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A quantitative characterization, grain size technique for applications in the analysis of materials, material analysis using wave/particle radiation, measuring devices, etc.
Active Publication Date: 2018-04-10
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 relates to a method for quantitatively characterizing the grain size of a main phase structure of a complex phase material, and belongs to the technical field of metal material physicalproperty inspection. By means of sample preparation, a section sample having microscopic difference between the main phase structure and a second-phase structure is prepared; EBSD surface scanning iscarried out, the calibration rate of the main phase structure is higher than 90%, the calibration rate of the second phase is lower than 10%, or even no diffraction pattern exists; finally, EBSD surface scanning data analysis is carried out to remove false points, singular points and noise points in a scanning result, then the calibrated data points of a second phase are set as a zero solution through a small particle removing mode, or a lining degree range corresponding to the second phase in a diffraction contrast graph is set as a zero solution, the noise point removal process is repeated,and grains of the main phase structure are quantitatively analyzed. The method has the advantages that the microscopic morphology of the main phase grains of the complex phase material can be clearlyand visually displayed, and quantitative characterizing is conducted on 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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