MATEC Web of Conferences (Jan 2015)

The morphology of lath martensite: a new perspective

  • Koumatos Konstantinos,
  • Muehlemann Anton

DOI
https://doi.org/10.1051/matecconf/20153307003
Journal volume & issue
Vol. 33
p. 07003

Abstract

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A mathematical framework is proposed to predict the features of the (5 5 7) lath transformation in low-carbon steels based on energy minimisation. This theory generates a one-parameter family of possible habit plane normals and a selection mechanism then identifies the (5 5 7) normals as those arising from a deformation with small atomic movement and maximal compatibility. While the calculations bear some resemblance to those of double shear theories, the assumptions and conclusions are different. Interestingly, the predicted microstructure morphology resembles that of plate martensite, in the sense that a type of twinning mechanism is involved.