Variation of the magnetic properties of the martensite phase of SUS304 steel due to tensile deformation

Abstract

In order to be able to develop a deterioration sensor based on the inherent magnetic phase in type 304 stainless steel (SUS304 steel), the relationships between the magnetic properties of SUS304 steel and the martensite structure induced in it by tensile deformation were investigated using the electromagnetic impedance (EMI) method, optical microscopy, and the equivalent inclusion method. The results showed that the martensite fraction and internal stress had the greatest effect on the magnetic properties of SUS304 steel in the low tensile strain range. On the other hand, in the high tensile strain region, the changes in the shape and orientation of the martensite particles owing to tensile deformation had the most significant effect on the magnetic properties of SUS304 steel.