Monday 27 October 2014 at 12:30 in the Seminar room at the 4 floor at the Polytechnic University College of Donostia - San Sebastián
Professor Amitava Mitra
Group Leader: NDE and Magnetic Materials Group
Materials Science & Technology Division
CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India
Application of Rapidly Solidified Soft Magnetic Materials
The magnetic laboratory of CSIR-National Metallurgical Laboratory in India has the capability of developing rapidly solidified materials in the form of ribbon as well as wires. The work has been extended to the development of rapidly solidified bilayered (FeSiB+CoSiB) ribbon in a single step with functionally graded magnetostriction (s) properties (positive s at one side and negative s on other side). This material has the potential for development of bend sensor. Nearly zero magnetostrictive wires show large change in magnetoimpedance when operated in the frequency range of 100 kHz to 10 MHz and termed as Giant Magneto-Impedance (GMI) materials. Using such materials a GMI sensor named as MagSys has been developed suitable to monitor damages occurring due to carburization at the component Johnson screen used at Catalytic Converter Reactor Unit (CCRU) of petroleum refinery unit. The high magnetostrictive FeSiB based alloys has been used as Magnetostrictive Sensing (MsS) element for generation of ultrasonic guided wave when properly wrapped on pipeline. Such device has been used for Long Range Ultrasonic Testing (LRUT) of pipeline for detection of cracks.