Three-Dimensional Scanning Hall Probe Microscopy for Final Stage of Crack Growth of Chromium Molybdenum Steel SCM440

Crack propagation around the stress concentration area causes fatigue failure. Non-destructive method is necessary for monitoring structure fatigue before destruction. We focused on a magnetic non-destructive evaluation method for crack growth. In order to understand the relation between crack propa...

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Bibliographic Details
Published in:Key engineering materials 2017-08, Vol.748, p.386-390
Main Authors: Kida, Katsuyuki, Nakashima, Tatsurou
Format: Article
Language:English
Subjects:
Chromium molybdenum steel
Chromium molybdenum steels
Crack propagation
Destruction
Destructive testing
Fatigue failure
Flux density
Fracture mechanics
Hall probes
Magnetic flux
Magnetism
Molybdenum steels
Nondestructive testing
Plates (structural members)
Stress concentration
Stress propagation
Tensile stress
Tool steels
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Summary:Crack propagation around the stress concentration area causes fatigue failure. Non-destructive method is necessary for monitoring structure fatigue before destruction. We focused on a magnetic non-destructive evaluation method for crack growth. In order to understand the relation between crack propagation and changes in magnetic flux density, we observed the position of the positive and negative magnetic flux density distributions around the crack of tool steel (SCM440) plate using a scanning Hall probe microscope (SHPM). We found that the vertical component of the three-dimensional magnetic flux density moved as the crack growth. Furthermore, the magnetic component which is parallel to the tensile stress appeared just before destruction of the specimen.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.748.386