TY - GEN
T1 - Evaluation of hardened and non- ardened regions using eddy current testing
AU - Sakai, Kenji
AU - Ito, Takahiro
AU - Kiwa, Toshihiko
AU - Tsukada, Keiji
PY - 2018/1/1
Y1 - 2018/1/1
N2 - A steel plate having hardened and non-hardened regions in one plate is promising material in automobile field owing to its high performance. This steel plate has to be evaluated whether the non-hardened region was prepared properly at the desired position with desired hardness. However, the conventional evaluation method of hardness measurement is destructive testing and requires a long inspection time. Therefore, a reliable and fast nondestructive inspection method is required. In this study, the hardened and non-hardened regions were evaluated using an eddy current testing (ECT) to distinguish each region. The measured resistivity and permeability at each region were different and these differences were found to be caused by the crystal structure change of heat treatment. Therefore, the magnetic response between the hardened and nonhardened regions was different and this difference was correlated with the hardness of each region. These results indicate that the hardened and non-hardened regions can be distinguished using ECT.
AB - A steel plate having hardened and non-hardened regions in one plate is promising material in automobile field owing to its high performance. This steel plate has to be evaluated whether the non-hardened region was prepared properly at the desired position with desired hardness. However, the conventional evaluation method of hardness measurement is destructive testing and requires a long inspection time. Therefore, a reliable and fast nondestructive inspection method is required. In this study, the hardened and non-hardened regions were evaluated using an eddy current testing (ECT) to distinguish each region. The measured resistivity and permeability at each region were different and these differences were found to be caused by the crystal structure change of heat treatment. Therefore, the magnetic response between the hardened and nonhardened regions was different and this difference was correlated with the hardness of each region. These results indicate that the hardened and non-hardened regions can be distinguished using ECT.
KW - Eddy current testing
KW - Hardness
KW - Magnetic sensor
KW - Permeability
KW - Phase
UR - http://www.scopus.com/inward/record.url?scp=85050531361&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85050531361&partnerID=8YFLogxK
U2 - 10.3233/978-1-61499-836-5-1
DO - 10.3233/978-1-61499-836-5-1
M3 - Conference contribution
AN - SCOPUS:85050531361
T3 - Studies in Applied Electromagnetics and Mechanics
SP - 1
EP - 8
BT - Electromagnetic Non-Destructive Evaluation (XXI)
PB - IOS Press
T2 - 22nd International Workshop on Electromagnetic Nondestructive Evaluation, ENDE 2017
Y2 - 6 September 2017 through 8 September 2017
ER -