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Isothermal Martensitic Transformation in a Sensitized SUS304 Stainless Steel under Magnetic Field

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Abstract:

We have investigated effect of magnetic field at cryogenic temperature on the stability of austenitic phase in a sensitized SUS304 stainless steel. The sensitization of the steel was made by heat-treatment in vacuum at 973 K for 100h after the solution treatment at 1323 K for 0.5 h. Isothermal holding of the sensitized specimens was made under a static magnetic field of 5 T in the temperature range between 60 and 260 K for various holding times. As a result, the TTT diagram under the magnetic field corresponding to the formation of 0.5 vol. % of -martensite shows a double-C curve with two noses. We found that by the application of magnetic field, the nose temperature and the incubation time of upper part of the C-curve, that is due to the    transformation, become lower and shorter, respectively. On the other hand, the nose temperature of lower part of the C-curve, that is due to the      transformation, does not change under the magnetic field although the incubation time shortens by the application of magnetic field.

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Periodical:

Materials Science Forum (Volumes 654-656)

Pages:

130-133

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.130

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Online since:

June 2010

Authors:

Ju Young Choi, Takashi Fukuda, Tomoyuki Kakeshita

Keywords:

Austenitic Stainless Steel, Isothermal Martensitic Transformation, Magnetic Field

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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