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Method for evaluating forms, sizes and distributions of free cementites in aluminum killed steel

A technology of free cementite, aluminum killed steel, used in the analysis of materials, preparation of test samples, material analysis using wave/particle radiation, etc. Stamping formability and other issues

Inactive Publication Date: 2013-01-09
SHOUGANG CORPORATION
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Problems solved by technology

[0002] With the development of the automobile industry and the home appliance industry, there is a relatively broad development prospect for low-carbon annealed steel plates, especially low-carbon aluminum-killed steels are widely used in ordinary inner and outer plates of cars and home appliances because of their good performance and low alloy cost. It has been widely used, but aluminum killed steel also has obvious shortcomings, that is, the formation and control of free cementite particle shape, size and distribution in the annealing process, some scholars believe that coarse carbide particles (free cementite) The presence of will cause cracking near the grain boundary during the stamping process and ultimately affect its stamping performance
Therefore, it is necessary to qualitatively and quantitatively analyze the content, shape, size and distribution of free cementite in low-carbon aluminum-killed steel. The traditional method is to use metallographic method to etch out free cementite and observe it under an optical microscope. Morphology and distribution, but there are not many characterization methods to evaluate the morphology, size and distribution of free cementite qualitatively and quantitatively

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  • Method for evaluating forms, sizes and distributions of free cementites in aluminum killed steel

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Embodiment Construction

[0023] Size, Morphology and Distribution of Free Cementite Particles in SPCC Aluminum Killed Steel

[0024] 1. Sample preparation. According to the EBSD sample preparation requirements, first cut the block sample into a thin slice sample with a length of 10mm, a width of 10mm, and a thickness of 1mm to ensure that the upper and lower surfaces are parallel, then pre-grind and polish the surface, and then perform electrolytic polishing to remove the stress layer on the surface. Make sure the kikuchi pattern is clearly visible.

[0025] 2. Electron beam status. In order to obtain a fine beam spot, parameters such as accelerating voltage, probe current, and working distance need to be adjusted. The best conditions selected for this test are: accelerating voltage 15kV, probe current 2.5nA, and the diameter of the beam spot is less than 100nm at this time. The distance is 15mm, the inclination angle of the sample stage is 70°, and the 3# objective lens diaphragm is selected at the...

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Abstract

The invention relates to a method for evaluating forms, sizes and distributions of free cementites in aluminum killed steel, belongs to the technical field of free carbon detection in steel, and solves the problems of qualitative and quantitative representations of the forms, the sizes and the distributions of the free cementites in the aluminum killed steel. A representation method comprises the following steps of: carrying out EBSD (Electron Back-Scattered Diffraction) face scanning on a sample after carrying out electrolytic polishing on the sample, receiving a diffraction signal by an EBSD probe and forming an image, and thus obtaining a pattern contrast quality map which represents the qualities of Kikuchi patterns by different contrasts; as the surface stresses are residual on free cementite particles, the Kikuchi patterns are vague, and most of the particles represent zero solution characteristics; compared with the patterns of ferrites, the differences of the pattern contrasts of the Kikuchi patterns are obviously larger; and thus the data analyzing is carried out on the sizes and the forms of the free cementite particles and the distributions of the free cementite particles in a matrix by virtue of the characteristics and EBSD processing software, and the content, the sizes and the distributions of the free cementite particles in a selected region are measured.

Description

technical field [0001] The invention belongs to the technical field of free carbon detection in steel, in particular to a method for evaluating the form, size and distribution of free cementite in aluminum-killed steel. ) qualitative and quantitative characterization of the morphology, size and distribution of free cementite in aluminum-killed steel. Background technique [0002] With the development of the automobile industry and the home appliance industry, there is a relatively broad development prospect for low-carbon annealed steel plates, especially low-carbon aluminum-killed steels are widely used in ordinary inner and outer plates of cars and home appliances because of their good performance and low alloy cost. It has been widely used, but aluminum killed steel also has obvious shortcomings, that is, the formation and control of free cementite particle shape, size and distribution in the annealing process, some scholars believe that coarse carbide particles (free cem...

Claims

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Application Information

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IPC IPC(8): G01N23/203G01N1/28
Inventor 崔桂彬鞠新华郝京丽
Owner SHOUGANG CORPORATION
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