CHARACTERIZATION OF PURE IRON AND (130-PPM) CARBON-IRON BINARY ALLOY BY BARKHAUSEN NOISE MEASUREMENTS - STUDY OF THE INFLUENCE OF STRESS AND MICROSTRUCTURE
C. Gatelierrothea et al., CHARACTERIZATION OF PURE IRON AND (130-PPM) CARBON-IRON BINARY ALLOY BY BARKHAUSEN NOISE MEASUREMENTS - STUDY OF THE INFLUENCE OF STRESS AND MICROSTRUCTURE, Acta materialia, 46(14), 1998, pp. 4873-4882
Citations number
23
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
The aim of this work is to measure and characterize the ferromagnetic
noise from high purity iron and 130 p.p.m. carbon-iron alloy in variou
s physical and metallurgical conditions. This is the basis of an indus
trial development of Barkhausen noise as a non-destructive evaluation
technique of microstructural changes. The amplitudes and shapes of Bar
khausen signals are correlated with the grain size in pure iron and wi
th the presence of interstitial carbon atoms in the iron matrix (magne
tic after effect phenomena) in 130 p.p.m. carbon-iron alloy. This tech
nique is also very sensitive to the location (inter- or intragranular
precipitations), the nature (cementite or epsilon carbide), the densit
y and size (coalescence effect) of carbide precipitates and internal s
tresses. The influence of microstructure is analyzed in terms of Bloch
wail interactions with crystal defects as pinning points, closure dom
ains or dislocation configurations. (C) 1998 Acta Metallurgica Inc. Pu
blished by Elsevier Science Ltd. All rights reserved.