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
CN109959670BActive Publication Date: 2021-12-14SHANGHAI MEISHAN IRON & STEEL CO LTD
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI MEISHAN IRON & STEEL CO LTD
Publication Date
2021-12-14

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More