0.65C-13Cr-Fe合金の非磁性相の低温安定化の検討

抄録

We succeeded in creating a partial nonmagnetic area in magnetic 0.65C-13Cr-Fe alloy. This ‘dual state magnetic material’ is expected to separate magnetic design from mechanical design for ideal magnetic parts. A material for automoive use must be able to withstand temperatures below -40°C. To use dual state magnetic material as an automotive part, it is necessary to find an appropriate method to obtain a steady state down to -40°C. We performed heat treatment with parameters of heat treatment temperature and heat treatment time. By measuring magnetic permeability and microscope images, we found that a heat treatment temperature of 1200°C and heat treatment time of 2 min. is the most appropriate condition. With a heat treatment temperature of 1100°C, permeability is not low enough to be considered nonmagnetic.