Size and aspect ratio of martensite in Fe-Ni-C alloys formed under applied magnetic field and tensile elastic stress at 4.2 K

H. Ohtsuka*, G. Ghosh, H. Wada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The dimensions of fully grown martensite plates in Fe-27Ni-0.8C and Fe-31Ni-0.4C alloys formed at 4.2 K under applied magnetic field (10 Tesla) and tensile elastic stress (220 MPa) are reported. The plates formed in a cluster are classified into two categories during stereological measurements: the plates whose radial growth is limited by the austenitic grain boundaries only (Type I), and the plates whose radial growth is limited by the pre-existing martensitic plates only (Type II). It is demonstrated that the formation sequence of the plates has a strong effect on the radial growth and aspect ratio. The measured aspect ratio of type I plates in the Fe-27Ni-0.8C alloy agree very well with an earlier prediction based on the aspect ratio measurements in the temperature range of 193 to 77K in an Fe-23.2Ni-2.9Mn alloy. Both these alloys are non-invar. However, in the case of Fe-31Ni-0.4C alloy, which is expected to be invar, the measured aspect ratio is less than the predicted value at 4.2 K.

Original languageEnglish (US)
Pages (from-to)342-346
Number of pages5
JournalMaterials Science and Engineering A
Volume273-275
DOIs
StatePublished - Dec 15 1999

Keywords

  • Aspect vratio of martensite
  • Fe-Ni-C
  • Influence of magnetic fields and stresses
  • Martensitic transformation
  • Radial growth
  • Transformation behavior at 4.2 K

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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