·Table of Contents
·Methods and Instrumentation

NDT Characterisation of Thermal Ageing by Barkhausen Signal Analysis

Soraia Pirfo
ASI - Applied Structural Integrity Consulting - Hungary
Ferenc Gillemot
Atomic Energy Research Institute - KFKI/AEKI - Hungary


1. Introduction

2. Barkhausen Signal

3. Thermal ageing studies

Fig 3: Correlation among Barkhausen RMS signal and hardness Vickers due to effect of thermal ageing on NiCoFe material. Fig 4: Correlation among the yield strength and relative value to permeability (called GAP) in differently aged NiFeCo alloy.

4. Conclusion


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  3. Pirfo B., S., Gillemot, F. Nondestructive characterisation of structural steels ageing, Joint EC IAEA specialists meeting on NDT Methods for Monitoring Degradation, Ed. U. von Estorff, L.M. Davies, P. Trampus, Petten, The Netherlands, 10-12 March, 1999, pp. 122-132.
  4. Coren, R.L. Basic Engineering Electronics and Applied Approach, Prentice-Hall, USA, 1989.

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