Deformation Effects on Metal Magnetic Memory in API 5L X70 Steel

Abstract:

Metal magnetic memory technology is a passive magnetic method of non-destructive testing based on the residual magnetic field of a ferromagnetic component. The MMM measurements were performed on a series of X70 pipeline steel samples for various values of uniaxial elastic and plastic deformation from zero up to about 20% strain. The outcomes evidence that the metal magnetic memory gradient index m can be used to evaluate the stress-strain state of ferromagnetic materials under tensile stresses. The tensile stress effect on the gradient index m significantly in elastic stage, but the gradient index m remained unchanged in the plastic deformation stage.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 2101-2104
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.2101
• Online since: December 2011
• Authors: Fang Bai, Bo Song
• Keywords: Elastic-Plastic Deformation, Gradient Index, Metal Magnetic Memory (MMM), X70 Steel

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