Effect of an 8 Tesla Magnetic Field on Mechanical Properties of Incoloy 908 Alloy at 4K
Tensile tests were performed using specimens of 3mm thickness. Fracture toughness tests were carried out on half size specimens. These specimens were machined from a hot rolled 28mm thick plate. After the effects of an 8 tesla magnetic field were calibrated, clip-on gauges were used in these tests. Effects of the magnetic field on 0.2% proof strength, tensile strength, elongation, Young’s modulus, serration and fracture toughness were examined. The application of the magnetic field showed no noticeable effect on tensile properties whereas increases in Young’s modulus and tearing modulus were observed in the magnetic field. The magnetic effect on serrated flow was not clear because amplitude and frequency of the serration of this alloy are too small. The reason for this small serration was discussed using computer simulation by comparing with the serration observed in high strength austenitic stainless steel YUS170 which has a similar strength level at 4K.
KeywordsMagnetic Field Fracture Toughness Austenitic Stainless Steel Fracture Toughness Test Japan Atomic Energy Research Institute
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