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Magnetic evaluation of hardening effect for carbon steel

Y. KAI1,* , Y. TSUCHIDA2, M. ENOKIZONO1

Affiliation

  1. JSPS Research Fellow, Faculty of Engineering, Oita University, Dannoharu 700, Oita 870-1192, Japan
  2. Faculty of Engineering, Oita University, Dannoharu 700, Oita 870-1192, Japan

Abstract

A hardening method can increase hardness of steel at the risk of increasing its brittleness. Therefore, estimations of hardness and hardening depth are very important. We clarified the magnetic properties of hardened carbon steel depending on hardening depth with cut-out hardened carbon steel rings, and proposed some electromagnetic methods to evaluate hardness and hardening depth instead of the conventional mechanical tests. However, it was difficult to evaluate quantitatively hardness and hardening depth with high accuracy. In this paper, we propose a new magnetic sensor to measure magnetic properties in hardened carbon steel plates from outside. The magnetic properties of hardened carbon steel plates under different hardening temperature conditions are examined. The results show that influence of hardening temperature on the hysteresis loss and the eddy current loss is large and we can improve estimation accuracy of hardness and hardening depth by using the new magnetic sensor..

Keywords

Carbon steel, Hardening depth, Hardness, Magnetic properties.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

Y. KAI, Y. TSUCHIDA, M. ENOKIZONO, Magnetic evaluation of hardening effect for carbon steel, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1078-1084 (2008)