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 (Fe X Co 100-X ) 100-(±+²+³) Cr ± Si ² B ³ , characterized in that ±² and ±³, wherein ± is preferably in the range of 2 to 4% by weight, ² is preferably in the range of 11.5% to 13% by weight, and ³ 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 (Fe 6% Co 94% ) 72.5% Cr 2% Si 12.5% B 13% . 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.