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Method for electromagnetic non-destructive detection of microstructure of dual-phase steel

A technology of microstructure and non-destructive testing, which is applied in the direction of material analysis, measuring devices, and material magnetic variables through electromagnetic means, and can solve the problems of empirical data correlation, fuzzy relationship, and complicated detection parameters, etc.

Active Publication Date: 2019-08-30
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] Most of the existing electromagnetic sensors are detected at room temperature, the detection parameters are complicated, the data correlation is empirical, and the relationship between the electromagnetic signal and the physical properties of the material (permeability, resistivity) is fuzzy

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  • Method for electromagnetic non-destructive detection of microstructure of dual-phase steel
  • Method for electromagnetic non-destructive detection of microstructure of dual-phase steel
  • Method for electromagnetic non-destructive detection of microstructure of dual-phase steel

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Embodiment Construction

[0023] combined with Figure 1~5 , a method for electromagnetic nondestructive testing of the microstructure of dual-phase steel, comprising the following steps:

[0024] (1) According to the actual metallographic photos, extract and quantify the microstructure, including:

[0025] Obtain the actual metallographic photos of different phase contents, carry out the binarization processing of the images, import the obtained data into the finite element software to establish the microcosmic model, combine the attached figure 2 .

[0026] (2) Establish a finite element microcosmic-permeability model of steel with different ferrite phase fractions, and obtain the relationship between relative permeability-ferrite fraction-temperature through simulation calculations, including:

[0027] Since each metallographic photo contains 100,000 pixels, different colors can be used in the model to distinguish different phases in the microstructure, such as ferrite is red, pearlite is blue, a...

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Abstract

The invention discloses a method for electromagnetic non-destructive detection of microstructure of a dual-phase steel. The method provided by the invention establishes a microstructure-initial permeability / resistivity-electromagnetic signal-temperature relationship database through a finite element microscopic and macroscopic model, and can directly predict the microstructure composition of the dual-phase steel through the measured electromagnetic signal, thereby determining the mechanical properties and quality of steel products, so that compared with the destructive detection method, the method provided by the invention is simple and efficient and capable of online monitoring in real time with true and accurate result and representative, and the database can be quickly and repeatedly used once established and can be updated and expanded according to the actual production situation. The method provided by the invention reveals the physical connection between the microstructure and the electromagnetic signal, realizes the detection under high temperature at the same time, and lays the foundation for realizing the microstructure of the steel for electromagnetic signal monitoring aswell as real-time feedback, dynamically adjusting production and cooling parameters.

Description

technical field [0001] The invention relates to a method for electromagnetic non-destructive testing of the microstructure of dual-phase steel, which belongs to the application range of electromagnetic non-destructive testing and serves for iron and steel metallurgical processes. Background technique [0002] The iron and steel metallurgical production process usually involves the adjustment of temperature and the corresponding change of the microstructure of iron and steel products. For example, in the production process of hot-rolled strip steel, the continuous casting slab is output from the continuous casting machine, passes through the heating furnace, and then enters the hot rolling process. The slab is repeatedly rolled by rolls, and enters the cooling zone for cooling after the size, thickness or shape meets the specified requirements. , and finally rolled into hot-rolled steel coils by a coiler. When the steel strip is cooled by water from high temperature, a solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72G01N27/04
CPCG01N27/72G01N27/041Y02A90/30
Inventor 申嘉龙周磊刘军孟征兵李义兵
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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