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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
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Sensors and Materials, Volume 34, Number 3(2) (2022)
Copyright(C) MYU K.K.
pp. 1007-1016
S&M2869 Research Paper
https://doi.org/10.18494/SAM3703
Published: March 10, 2022

Proposed Method for Simultaneous Inspection of Lift-off and Surface-hardened Depth in Induction-hardened Steel Plate Using Electromagnetic Properties [PDF]

Tsubasa Yoshinaga, Yuji Gotoh, Shun Onita, Takashi Horino, and Yoshitaka Misaka

(Received November 9, 2021; Accepted February 2, 2022)

Keywords: induction-hardened steel, surface-hardened depth, lift-off, 3D nonlinear electromagnetic FEM, electromagnetic non-destructive inspection

The evaluation of surface-hardened depth (D) in induction-hardened steel is important in the guarantee of quality of the steel. If the size of the surface-hardened steel is large, a nondestructive evaluation method is required to inspect the D since destructive testing using, for example, a Vickers hardness tester, becomes difficult. The electromagnetic properties of the hardened layer are different from those of the nonhardened layer in surface-hardened steel. Therefore, it is possible to estimate the D of surface-hardened steel by measuring the difference in these electromagnetic characteristics using an electromagnetic sensor. On the other hand, the detection signal in the electromagnetic sensor is also affected by the distance (lift-off: Lo) between the surface of the hardened steel and the sensor. In this paper, a method for simultaneously measuring the D in a hardened steel plate and Lo is proposed. The usefulness of simultaneous measurement using the proposed inspection method is evaluated by a 3D nonlinear finite element method taking account of the initial B–H (magnetic flux density: B, magnetic field strength: H) curve and the conductivity of the layers with and without hardening in the surface-hardened steel. In addition, an experimental verification is also carried out.

Corresponding author: Tsubasa Yoshinaga


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Cite this article
Tsubasa Yoshinaga, Yuji Gotoh, Shun Onita, Takashi Horino, and Yoshitaka Misaka, Proposed Method for Simultaneous Inspection of Lift-off and Surface-hardened Depth in Induction-hardened Steel Plate Using Electromagnetic Properties, Sens. Mater., Vol. 34, No. 3, 2022, p. 1007-1016.



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