Isothermal martensitic transformation in a 12Cr-9Ni-4Mo-2Cu stainless steel in applied magnetic fields

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:320

Article

Martin, D. San¹  Aarts, K. W. P.¹  Rivera-Diaz-del-Castillo, P. E. J.¹  van Dijk, N. H.²  Bruck, E.³  van der Zwaag, S.¹ 

[1] Delft Univ Technol, Fac Aerosp Engn, Fundamentals Adv Mat Grp, NL-2629 HS Delft, Netherlands

[2] Delft Univ Technol, Fac Sci Appl, Fundamental Aspects Mat & Energy Grp, NL-2629 JB Delft, Netherlands

[3] Univ Amsterdam, Van Der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands

关键词: stainless steel;    magnetic field;    martensite;    austenite;    phase transformations;   

DOI  :  10.1016/j.jmmm.2008.02.002

来源: Elsevier

【 摘 要 】

This work concerns an in situ study of the isothermal formation of martensite in a stainless steel under the influence of magnetic fields up to 9T at three different temperatures (213, 233 and 253 K). It is shown that the presence of a constant applied magnetic field promotes the formation of martensite significantly. The activation energy for the nucleation of martensite has been derived using a semi-empirical kinetic model. The experimental results have been analyzed using the Ghosh and Olson model. While this model describes the time and field dependences of the experimental data well, the thermal frictional energy and the defect size values are much lower than those expected from earlier work. (c) 2008 Elsevier B.V. All rights reserved.

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