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Method for Measuring Martensite Content in Duplex Steel Using Electron Backscatter Diffraction Technique

A technology of electron backscattering and technical measurement, which is applied to the use of wave/particle radiation for material analysis, measuring devices, instruments, etc., which can solve the problem of inability to obtain accurate percentage content, difficulty in distinguishing between martensite and ferrite, etc. problem, to achieve the effect of good sample repeatability, easy promotion and wide adaptability

Active Publication Date: 2021-12-14
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Description
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Problems solved by technology

[0007] The present invention is aimed at the technical problems existing in the prior art, and provides a method for measuring the content of martensite in dual-phase steel by electron backscatter diffraction technology, which can accurately and efficiently extract the martensite in the structure of dual-phase steel Bulk phase, which solves the problem that the martensitic structure and ferrite structure are difficult to distinguish and the precise percentage cannot be obtained

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  • Method for Measuring Martensite Content in Duplex Steel Using Electron Backscatter Diffraction Technique
  • Method for Measuring Martensite Content in Duplex Steel Using Electron Backscatter Diffraction Technique
  • Method for Measuring Martensite Content in Duplex Steel Using Electron Backscatter Diffraction Technique

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Embodiment 1

[0023] Embodiment 1: a kind of method adopting electron backscatter diffraction technique to measure the content of martensite in dual-phase steel, described method comprises the following steps:

[0024] 1) Grinding and polishing the sample to be tested after inlaying to make a common metallographic sample;

[0025] 2) Vibrating and polishing the polished common metallographic sample in a vibration polishing machine;

[0026] 3) Corroding the metallographic sample after vibration polishing, the corrosion solution is 1-4% nitric acid alcohol solution, and the corrosion time is 10-15s;

[0027] 4) Put the prepared metallographic sample into the field emission scanning electron microscope sample chamber. After the vacuum reaches the requirements, set reasonable acceleration voltage, beam current, tilt correction and other electron microscope conditions, and select a suitable area to obtain the sample image;

[0028] 5) Through reasonable parameter setting, collect EBSD data, an...

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Abstract

The invention relates to a method for measuring the content of martensite in dual-phase steel by using electron backscattering diffraction technology. The method includes the following steps: 1) grinding and polishing the sample to be tested to make a common metallographic sample; 2) Perform vibration polishing on the polished ordinary metallographic sample in a vibration polishing machine; 3) Corrode the metallographic sample after vibration polishing, the corrosion solution is 1‑4% nitric acid alcohol solution, and the corrosion time is 10‑15s ; 4) Put the prepared metallographic sample into the field emission scanning electron microscope sample chamber, 5) collect EBSD data through reasonable parameter settings, and use software to analyze the data to obtain the slope diagram of the Kikuchi band, and form a new Subset, extract the M phase in the subset, so as to obtain the percentage of martensitic structure in the sample to be tested. This scheme can accurately and efficiently extract the martensite phase in the dual-phase steel structure, and solves the problem that the martensite structure and the ferrite structure are difficult to distinguish and cannot obtain accurate percentages.

Description

technical field [0001] The invention relates to a method for measuring martensite content in dual-phase steel by using an electron backscattering diffraction technique, belonging to the technical field of material analysis. Background technique [0002] Hot-rolled dual-phase steel is based on phase transformation strengthening. Its microstructure is ferrite in soft phase and martensite in hard phase. It has very low yield ratio, high strength and high formability, and is widely used in automobile reinforcement. Panels, chassis, bumpers and other car body components. As the hard phase in dual-phase steel, martensite has a direct impact on the tensile strength, elongation, yield ratio and other mechanical properties of dual-phase steel. Therefore, accurate and quantitative analysis of hot-rolled dual-phase steel The percentage of martensite in the steel is of great significance for the optimization of the production process of the steel and the evaluation of its mechanical pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/203
CPCG01N23/203
Inventor 赵楠周丽萍刘学伟
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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