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Detection of Cu-Precipitates in Steel by Micro-Magnetic Nondestructive Techniques

 
: Dobmann, G.; Altpeter, I.

Echigoya, J. ; Iron and Steel Institute of Japan -ISIJ-:
Relationship between Magnetic and Structural Properties : Proceedings of International Symposium on Relationship between Magnetic and Structural Properties - Basic and Applications
Hanamaki: The Iron and Steel Institute of Japan, 2000
ISBN: 4-930980-17-8
S.73-76
International Symposium on Relationship between Magnetic and Structural Properties <2000, Hanamaki, Japan>
Englisch
Konferenzbeitrag
Fraunhofer IZFP ()
nondestructive testing; materials property determination; embrittlement; toughness degradation; Cu precipitates; precipitation hardening; coherent precipitates; residual stress; recovery annealing

Abstract
The ferritic steel WB 36 (15 NiCuMoNb 5 according to 1.6368) is applied in Germany in many fossil and nuclear power plants in piping with service temperatures up to 300°C. In fossil power plant applications in Europe some severe pipe damage occurred in components working in the temperature range of 320 - 350°C. In each case an enhancement of strength and a reduction of the Charpy notch energy was detected by destructive tests. Cu precipitation causes the effects. Load-dependent Barkhausen noise measurements were performed on different annealed microstructures and have revealed the residual stress effect of the Cu precipitates with an average value of 10-23 Mpa tensile stress in the ferrite matrix of the steel samples.

: http://publica.fraunhofer.de/dokumente/N-3327.html