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Phase Transformation Crystallography of Lath Martensite

Published online by Cambridge University Press:  26 February 2011

Xiao Ma
Affiliation:
jeffreym@liv.ac.uk, The University of Liverpool, Department of Engineering, Brownlow Hill, Liverpool, L69 3GH, United Kingdom
R.C. Pond
Affiliation:
r.c.pond@liv.ac.uk, The University of Liverpool, Department of Engineering, Brownlow Hill, Liverpool, L69 3GH, United Kingdom
Corresponding
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Abstract

Our current understanding of martensitic transformations has been based on the Phenomenological Theory of Martensite Crystallography developed in the 1950s. Recently, a Topological Model of martensitic transformations has been presented wherein the habit plane is a semi-coherent structure, and the transformation mechanism is shown explicitly to be diffusionless. This approach is used here to model phase transformation crystallography of lath martensite in ferrous alloys. A range of network geometries is predicted corresponding to orientation relationships varying from Nishiyama-Wasserman to Kurdjumov-Sachs. Experimental observations from the literature of the dislocation and disconnection arrays, habit plane and orientation relationship are in good agreement with the model.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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