Non-Destructive Evaluation of Surface Hardening Depth of Spheroidal Graphite Cast Iron using Alternating Magnetic Field

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  • 交流磁界を使用した球状黒鉛鋳鉄の高周波表面焼入れ深さの非破壊評価
  • コウリュウ ジカイ オ シヨウ シタ キュウジョウ コクエン チュウテツ ノ コウシュウハ ヒョウメン ヤキイレ フカサ ノ ヒハカイ ヒョウカ

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Abstract

<p>  The measurement of the hardened depth of surface-hardening spheroidal graphite cast iron is important in the maintenance of various mechanical parts etc. Electromagnetic properties differ between layers that have been hardened and those that have been not. This enables evaluation of the hardened depth by detecting the difference in electromagnetic characteristics. In this paper, the electromagnetic method for measuring the depth of a hardened layer using an alternating magnetic field is proposed. The flux density in the surface hardening spheroidal graphite cast iron is estimated by 3-D nonlinear electromagnetic FEM taking into account the electromagnetic properties of hardened and unhardened layers. In addition, experimental verifications were also carried out.</p>

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