Measured and modelled low field relative permeability for dual phase steels at high temperature

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:475

Article

Zhou, L.¹  Hall, R.¹  Davis, C. L.¹ 

[1] Univ Warwick, WMG, Coventry CV4 7AL, W Midlands, England

关键词: High-temperature relative permeability;    Steel;    EM sensors;    In-situ test;    Phase fraction;    Finite element analysis;   

DOI  :  10.1016/j.jmmm.2018.11.096

来源: Elsevier

【 摘 要 】

The magnetic properties of steels are sensitive to temperature and currently the only way to determine them is by experimental measurement. In this work a cylindrical shaped ceramic cored EM sensor has been used to measure the low magnetic field inductance of pure iron and C-Mn steels with ferrite + pearlite microstructures during heat treatment up to 800 degrees C in a furnace. The low field relative permeability values have been determined by fitting the sensor readings to a finite element sensor model generated in COMSOL, where the model has been validated for room temperature measurements using samples of known low field relative permeability. The low field relative permeability values with temperature follow the expected trend of increasing values with temperature, particularly close to the Curie temperature. The measured low field relative permeability values for the mixed ferrite + pearlite microstructures have been compared to predicted values from an FE microstructure-permeability model using the single phase (ferrite or pearlite) low field relative permeability values as input. The model predictions agree well with the experimentally measured values allowing any two-phase ferrite + pearlite microstructure low field relative permeability with temperature relationship to be determined. The model has also been used to determine the low field relative permeability of ferrite + austenite microstructures with temperature.

【 授权许可】

Free