Changes in Magnetic Flux Density Distributions of Chromium Molybdenum Steel (JIS, SCM440) by Slit Opening and Crack Growth

Abstract:

Non-destructive evaluation methods using magnetic measurement systems have been developed. However, there are a few approaches to the effect of cracks on magnetic fields during whole fatigue process. In the present work, slit samples of as-received chromium molybdenum steel material (JIS, SCM440) including no retained austenite was fatigue tested. Fatigue process was observed using a scanning Hall probe microscope in order to investigate the effect of cyclic slit opening and crack growth on residual magnetic fields. It is found that the cyclic opening-closing of the slit decreases the magnetic flux density even where no tensile stress was applied.

• Periodical: Key Engineering Materials (Volume 703)
• Pages: 376-379
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.703.376
• Online since: August 2016
• Authors: Katsuyuki Kida*, Tatsurou Nakashima, Masayuki Ishida
• Keywords: Chromium Molybdenum Steel, Crack Growth, Magnetic Flux Density, Scanning Hall Probe Microscopy

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