2015 年 23 巻 4 号 p. 659-664
This paper presents a non-destructive evaluation for high chrome Fe-based steels by using a magnetic sensor. In order to make clear the fundamental magnetic properties related to tensile strain damage and fatigue damage, the magnetic measurement apparatus, which can measure the magnetic flux density and the magnetic field strength by B-coil and H-coil, was developed. And then the relationships between the damages and the measured magnetic properties are shown to discuss the capability of a non-destructive testing for high chrome Fe-based steels. The developed magnetic sensor was applied to make clear magnetic properties related to material changes with creep damage. The measured magnetic properties showed the material changes due to creep damages, and these results were discussed for the capability of a non-destructive evaluation to detect the creep damages on high chrome Fe-based steels.