Abstract
Damage of machine components occur when cracks form and continue to grow to a size large enough to cause fracture. In order to understand the crack propagation phenomena, non-destructive evaluation methods that can be correlated to measurements around the fatigue crack tips are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped with a three-dimensional sensor and observed magnetic fields around fatigue cracks at room temperature in air while they were growing. In order to study the relation between plastic deformations and magnetic flux densities, both as-received non-heat-treated and heat-treated (quenched and tempered) specimens were used. Medium carbon low alloy steel specimens (S45C, JIS) were used in the experiments. The area around the crack tip was magnetized and the changes in the area were observed. The changes in magnetic fields in soft and hard specimens with the same intensity factors were compared. A strong correlation between the changes in the magnet fields and plastic deformation areas was found.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
