Creep-fatigue (Creep fatigue and fatigue) tests of Mod. 9Cr-1Mo steel have been performed by varying stress holding time at 550℃. Creep-fatigue properties are affected by stress holding, and strain rate increases with increasing stress holding time．In Vickers hardness measurements Vickers hardness of creep fatigue damaged specimen is larger than that of fatigue damaged specimen. In magnetic characterization the saturated magnetic flux density and permeability of creep fatigue damaged specimens are larg...
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Creep-fatigue evaluation and damage characterization for structural materials of advanced fast breeder reactor

Austenitic stainless steel is usually classified as a nonmagnetic material. However, applying stress transforms the plastic part of it into a martensitic crystal struct ure, from an austenitic crystal structure and it becomes magnetized. Strain evaluation and fatigue evaluation can be performed by measuring the leakage magnetic flux de nsity of remanent magnetization after applying strain and fatigue to austenitic stainless steels. This paper describes the measurement of leakage magnetic flux density of r...
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Evaluation of Strain and Plane Bending Fatigue for Austenitic Stainless Steel by Measuring Leakage Magnet Flux

Abstract: This paper presents a frequency sweeping excitation and spectrogram method (FSES m ethod) by magnetic sensor for non-destructive testing of hardened carbon steel. This method c an evaluate the magnetic properties in materials which were changed after induction heating. And, we tried to examine the degree of yield strength which varies with hardened conditions....
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Non-destructive material evaluation for ferromagnetic steels by using a magnetic sensor

Abstract: This paper presents a non-destructive evaluation for high chrome Fe-based steels by using a magnetic sensor. In order to make clea r the fundamental magnetic properties related to tensile strain damage and fatigue damage, the magnetic measurement apparatus, which can mea sure the magnetic flux density and the magnetic field strength by B-coil and H-coil, was developed. And then the relationships between the d amages and the measured magnetic properties are shown to discuss the capability of a non...
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Non-destructive evaluation for high chrome Fe-based steels by using a magnetic sensor

The technique of obtaining shape of inclined defect at heat affected zon e for welded specimen of high chromium steel was proposed. In this techn ique, magnetic flux leakage measurement and the inverse analysis using s ingular value decomposition were used. Suitable defect shape was obtained from the magnetic flux density distribution under the high magnetic fiel d without being subject to the influence of a welding part. Under the lo w magnetic field, suitable defect shape was obtained by subtracting the ...
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Proposal of electromagnetic inverse analysis technique about the inclineddefect for welded specimen of high chromium steel