AN IMPROVED GIANT MAGNETO-IMPEDANCE (GMI) BASED SENSING DEVICE FOR THE DETECTION OF CARBURIZATION IN AUSTENITIC STAINLESS STEEL

摘要

The present invention relates to a compound exhibiting Giant Magneto-Impedance (GMI) properties. The general chemical formula of the compound is (FeXCo100-X)100-(a++)CraSiB, characterized in that a and a, wherein a is preferably in the range of 2 to 4% by weight, is preferably in the range of 11.5% to 13% by weight, and is preferably in the range of 11% to 13% by weight, and X is preferably about 6% by weight. The chemical formula more preferably is (Fe6%Co94%)72.5%Cr2% Si12.5%B13%. The present invention also relates to a giant magneto-impedance (GMI) based sensing device for non-destructive contactless detection of carburization in austenitic stainless steel samples in field.