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Academic Articles
Regular Paper (Contributed) Vol.2 (2010/2011) p.168 - p.180
 

Electromagnetic modeling of stress corrosion cracks in Inconel welds
 
Haoyu HUANG1, Noritaka YUSA2, Kenzo MIYA1, Hidetoshi HASHIZUME2, Takehiko SERA3, and Shinro HIRANO3
 
1 IIU Corp, 2-7-17-707, Ikenohata, Taito, Tokyo, 110-0008, Japan
2 Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2 Aramaki Aza Aoba, Aoba-Ku, Sendai, Miyagi, 980-8579, Japan
3 Kansai Electric Power, 13-8, Goichi, Mihama, Mikata, Fukui, 919-1141, Japan
 
Abstract
This study evaluates suitable numerical modeling of stress corrosion cracks appearing in Inconel welds from the viewpoint of electromagnetic nondestructive evaluations. The stress corrosion cracks analyzed in this study are five artificial ones introduced into welded flat plate, and three natural ones found in a pressurized nuclear power plant. Numerical simulations model a crack as a planar region having a uniform conductivity inside and a constant width, and evaluate the width and conductivity that reproduce the maximum eddy current signals obtained by experiments. The results obtained validate the existence of the minimum value of the equivalent resistance, which is defined by the width divided by conductivity. In contrast, the values of the width and conductivity themselves vary across a wide range. The results also lead to a discussion about (1) the effect of probe utilized on the numerical model, (2) the difference between artificial and natural stress corrosion cracks, and (3) the difference between stress corrosion cracks in base metals and those in Inconel welds in their models. Electromagnetic characteristics of four different Inconel weld alloys are additionally evaluated using a resistance tester and a vibrating sample magnetometer to support the validity of the numerical modeling and the generality of results obtained.
 
Keywords
electromagnetic nondestructive evaluation, eddy current testing, nuclear power plant, nickel-based alloy, finite element method, numerical modeling, natural crack, inverse problem, Alloy 600
 
Full Paper: PDF EJAM Vol.2 pp.168-180 "Electromagnetic modeling of stress corrosion cracks in Inconel welds"
Article Information
Article history:
Received 16 September 2010
Accepted 4 February 2011