Analysis of cold rolled steels of different reduction ratio using the magnetic Barkhausen noise technique

• Published in: Journal of materials science Vol. 36; no. 11; pp. 2795 - 2799
• Main Authors: STEFANITA, C.-G, CLAPHAM, L, YI, J.-K, ATHERTON, D. L
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.06.2001; Springer Nature B.V
• Subjects: Applied sciences; Barkhausen effect; Cold rolling; Crystallography; Dependence; Distribution centers; Exact sciences and technology; Forming; Magnetic properties; Materials science; Metals. Metallurgy; Nuclear reactor components; Nuclear reactors; Parameter modification; Pressure vessels; Production techniques; Pulse amplitude; Reduction; Residual stress; Rolling; Rolling direction; Voltage pulses; Cold rolling; Steel-ASTM-A508; Deformation ratio; Magnetic anisotropy; Pressure vessel; Forming; Cold rolled sheet; Barkhausen effect; Low alloy steel; Application; Magnetic properties; Nuclear reactor
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1017981317255

Magnetic Barkhausen Noise (MBN) was used to evaluate the magnetic behaviour of nuclear reactor pressure vessel steel specimens cold rolled to reduction ratios between 0% and 60%. Measurements performed at increasing reduction ratios revealed variations in the angular dependence of a parameter termed ‘MBNenergy’, concurrent with modifications in the shape of the pulse height distribution curves. The angular preference of MBNenergy present prior to cold rolling was destroyed at intermediate reduction ratios (≈25%), and restored with further reduction (≈40%). Along the rolling direction, the number of large voltage pulses was reduced at reduction ratios of ≈25%, increasing again at ≈60% reduction ratio. Results were attributed to competing effects between crystallographic texture, microscopic and macroscopic residual stresses.