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Sensors and Materials, Volume 36, Number 9(1) (2024)
Copyright(C) MYU K.K.
pp. 3691-3700
S&M3759 Research Paper
https://doi.org/10.18494/SAM5161
Published: September 2, 2024

Examination of Slit Defect Inspection Method for Steel Bars Using Only DC Magnetic Field with the Velocity Effect [PDF]

Masafumi Kuromizu and Yuji Gotoh

(Received May 30, 2024; Accepted July 17, 2024)

Keywords: non-destructive inspection, velocity effect, ferromagnetic materials, static magnetic field, eddy current, 3D nonlinear FEM, electromagnetic sensors

C45, a ferromagnetic material, can be strengthened by heat treatment such as quenching and is widely used as a material for general mechanical parts such as springs in automobiles. However, the presence of defects or flaws can cause cracking during the quenching stage, and a high-speed inspection method for detecting defects is required. In this study, we proposed and examined an inspection method for detecting defects using only a DC magnetic field by moving a round steel bar material at a high speed of 1 m/s inside a ring-shaped permanent magnet and generating eddy currents due to the velocity effect.

Corresponding author: Masafumi Kuromizu


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Cite this article
Masafumi Kuromizu and Yuji Gotoh, Examination of Slit Defect Inspection Method for Steel Bars Using Only DC Magnetic Field with the Velocity Effect, Sens. Mater., Vol. 36, No. 9, 2024, p. 3691-3700.

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