CHARACTERIZATION OF PURE IRON AND (130-PPM) CARBON-IRON BINARY ALLOY BY BARKHAUSEN NOISE MEASUREMENTS - STUDY OF THE INFLUENCE OF STRESS AND MICROSTRUCTURE

Citation
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
Journal title
ISSN journal
13596454
Volume
46
Issue
14
Year of publication
1998
Pages
4873 - 4882
Database
ISI
SICI code
1359-6454(1998)46:14<4873:COPIA(>2.0.ZU;2-7
Abstract
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.