Evaluation of the Material Degradation of Austenitic Stainless Steel under Pulsating Tension Stress Using Magnetic Method

Abstract

To prevent a serious accident by the metal degradation of a structure made of iron-based structural materials, we have already proposed some fatigue evaluation methods for various iron-based structural materials. One of these is a residual magnetization method that uses a thin-film flux-gate magnetic sensor. This method is called the perpendicular residual magnetization method. This fatigue evaluation method had a good correlation between the magnetic sensor output signal and the amount of plane bending fatigue damage in the iron-based structural materials. However, we have not yet evaluated the pulsating tension fatigue damage of iron-based structural material such as the austenitic stainless steels using this method. In this paper, we report the evaluation results of a pulsating tension fatigue damage accumulation in austenitic stainless steels (SUS316 and SUS316L) using the perpendicular residual magnetization method. From our experiment, the maximum value of the Z component residual leakage magnetic flux density clearly depends on the magnitude of pulsating tension and the number of stress cycles.

Non-Destructive Investigation of Intrinsic Magnetic Field of Austenitic Biomaterials by Magnetic Field Sensors

“…Designs for fluxgate magnetometers can be generally divided into two categories: with rod cores and utilizing ring cores. Many other designs, mainly based on rod cores, exist, but none have attained the level of development and efficiency of the two abovementioned kinds [ 14 , 22 , 23 ].…”

The evaluation of fatigue caused by plane-bending stress on stainless steel using the stacked-coil type magnetic sensor

“…It is well-known that the permeability and resistivity ( ) of the specimen can change as a result of fatigue damage. On the other hand, the eddy-current testing method has also been researched as a fatigue evaluation method for steel and stainless steel, regardless of their magnetic properties [9,10,11]. The inductance method is an eddy-current testing method.…”