Affiliations: [a] Departamento de Ingeniería Metalúrgica, ESIQIE, Instituto Politécnico Nacional, Zacatenco, México | [b] Laboratorio de Evaluación No Destructiva Electromagnética, IPN-ESIME-SEPI, Edif, Zacatenco, México
Correspondence:
[*]
Corresponding author: Tu Le Manh, Departamento de Ingeniería Metalúrgica, ESIQIE, Instituto Politécnico Nacional, Zacatenco, México D. F., 07738, México. Tel.: +86 52 55 57296000 ext. 54205; E-mail:letuprofesor@gmail.com
Abstract: This paper presents experimental evidence of the correlation between the
magnetocrystalline energy (MCE) and the Barkhausen noise (BHN) signal in
three API 5L steel samples. The angular dependence of the MCE in each sample
was determined using the r.m.s. values of the BHN signal in the time band
from saturation to remanence, for angular positions ranging from 0 to 180
degrees, in 10-degree steps. The angular dependence of the average MCE of
each steel was also estimated from the set of individual grain orientations
measured by Electron Backscatter Diffraction (EBSD). The average MCEs
determined from the BHN measurements and predicted from the measured EBSD
microtexture data show a relatively good concordance. This agreement is
explained by considering the influence that magnetocrystalline energy has on
the free pole charges that appear at grain boundaries as the material goes
from saturation to remanence and therefore on the irreversible nucleation
and growth of domains of reverse magnetization responsible for the BHN
activity in this band.
