A method for detecting and calculating austenite content in steel based on a permeability meter

CN117491474BActive Publication Date: 2026-05-26NORTHEASTERN UNIV CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEASTERN UNIV CHINA
Filing Date
2023-12-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately, quickly, and non-destructively determine the austenite content in large-volume steel, especially in steel with complex microstructures and textures. XRD and EBSD methods suffer from large errors, complex and expensive equipment, while magnetic methods are limited by equipment size and lack sufficient accuracy.

Method used

A calculation model was established by measuring the relationship between the overall saturation magnetization of steel and the austenite content using a single-chip magnetometer combined with the magnetomotive force-magnetization method. The austenite content in the steel was measured using AC or DC magnetization method. Standardized sample design and high magnetic field strength were adopted, combined with magnetomotive force-magnetization measurement method, to avoid the influence of demagnetization field.

Benefits of technology

It enables accurate, rapid, and non-destructive determination of austenite content in bulk steel, reduces measurement complexity, and improves measurement accuracy and repeatability. It is applicable to various high-grade and special steels.

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Abstract

This invention provides a method for detecting and calculating the austenite content in steel based on a permeability meter, relating to the fields of steel and electromagnetics. Based on the theoretical differences in saturation magnetization of different phases in ferromagnetic materials, this invention establishes a theoretical calculation model and detection method for measuring austenite content using a permeability meter. A standard-prepared sample is placed in a magnetic pole shoe, and the magnetic field strength H corresponding to the maximum permeability of the ferromagnetic material is first measured. μ Then at ≥1.5H μ Under a magnetic field strength of J, the polarization intensity of the magnetic field strength at multiple points was measured at continuous intervals. m Then, based on the saturation magnetization approximation law and derivation law, the saturation magnetization Js is fitted and solved. Finally, the austenite content is determined according to the theoretical calculation model of austenite content. The method described in this invention solves the influence of the constantly changing effective magnetic path length of traditional magnetometers on the measurement results. The method for determining austenite content is simple, has a solid theoretical basis, high measurement accuracy, and strong data repeatability.
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