Behavior of Deformation and Fracture of Metallic Materials Under High Magnetic Field and Low Temperatures.

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1. Effects of elastic stress on martensitic transformation in austenitic stainless steels at cryogenic temperatures : In SUS316LN steels, martensitic transformation did not occur. In SUS304L steels, the transformation was enhanced by the stress. The tendency of the enhancement was smaller as the stress increased.2. Effects of duplex application of stress and magnetic field on martensitic transformation in austenitic stainless steels : IN SUS304L steels, the transformation under the stress was enhanced by magnetic field, although clear additional effects of the duplex application has not been observed. In SUS316LN steels, martensitic transformation did not occur under duplex application of 0.2% flow stress and magnetic field up to 8 Tesla.3. Effects of plastic deformation and magnetic field on martensitic transformation at cryogenic temperatures : The amount of martensite induced by plastic deformation was increased by magnetic field. The increment was larger in austenitic stainless steels then in Fe-Ni binary Unvar steels. The difference between these steels was attributable to the fact that alpha' martensite transformed not only from gamma but also from epsilon in the stainless steels.4. Effects of magnetic field on serrated deformation at cryogenic temperatures : Amplitude of serration increased in both austenitic stainless and Unvar steels. This phenomenon was attributable to the increase in yield strength by the application of magnetic field. It was suggested by computer simulation that effect of latent heat of martensitic transformation on the serrated deformation was not large.