Effects of High Magnetic Fields on Martensitic Transformation at Cryogenic Temperatures for Variously Heat Treated Stainless Steels
The effects of magnetic fields up to 20 T on the isothermal martensitic transformation were examined in 304L and 316LN stainless steels which were heated at various solution treatment temperatures and cooled from these temperatures at variou rates. In the 316LN steel, since the amount of the martensite induced by the application of the magnetic fields was very small, the effects were not clear. In the 304L steel, a larger amount of α’ martensite was induced by the application of magnetic fields at liquid nitrogen temperature than at liquid helium temperature. The amount of α' martensite which was induced in magnetic fields increased with solution treatment temperatures and cooling rate from the temperatures. The amount of α' martensite did not increase linearly with an increase in the applied magnetic field but seemed to be saturated before the amount of the martensite attained 10 volume %.
KeywordsMagnetic Field Martensitic Transformation Liquid Nitrogen Temperature Isothermal Transformation Liquid Helium Temperature
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