TESTING OF STAINLESS STEEL BY DOUBLE YOKE DC MAGNETOMETER

István Mészáros

   In the present work the microstructure and the strain induced phase transformation of Lean Duplex Stainless steel were studied. Sheet samples were cold rolled, the number of samples was nine; the applied deformation was up to 80%. The first magnetization curves and the saturation magnetization loops were measured by a double yoke DC magnetometer. The double yoke magnetometer is based on the former Stablein-Steinitz type magnet tester. The idea of the measuring set up was reconstructed and modernized at the Department of Materials Science and Engineering of BUTE. The obtained laboratory measuring device is an accurate closedcircuit DC magnetometer which widely can be used for testing bulk magnetic samples. The measuring set-up was found to be especially suitable for testing structural steel and hard magnetic samples. This equipment was successfully applied for studying the ferritic-martensitic phase transformation of lean duplex stainless steel due to cold rolling deformation.

Keywords: double yoke DC magnetometer, phase transformation, strain induced martensite, lean duplex stainless steel, magnetic characterization

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