Evaluation of r-Value of Stainless Steel with Electromagnetic Transducer
Riichi@MURAYAMA
Abstract:A Lamb wave-mode electromagnetic acoustic transducer (EMAT) which makes use of the Lorenz force and magnetostrictive effect is produced as a device to evaluate the r-value of stainless steel sheet. Correlation between fundamental characteristics of this device and r-value obtained from uniaxial tensile test is examined for stainless steel and low carbon steel sheets. It is confirmed that the use of this device enables the evaluation of the r-values of ferrite stainless and austenite stainless steel sheets as well as low carbon steel sheets. It is also shown that the value of Ēr which gives the planar anisotropy of a sheet can be evaluated in good accuracy for the stainless steel sheets than for the low carbon steel sheet. Key Words:Electromagnetic transducer , Stainless sheet, Lankford-value (r-value) Ē-value, Lamb wave, Ultrasonic velocity