Martensite crystallography-The role of the shape strain

Kelly P.M. (2006) Martensite crystallography-The role of the shape strain. Materials Science and Engineering A, 438-440 SPEC. ISS.: 43-47. doi:10.1016/j.msea.2006.02.065


Author Kelly P.M.
Title Martensite crystallography-The role of the shape strain
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
Publication date 2006-11-25
Sub-type Article (original research)
DOI 10.1016/j.msea.2006.02.065
Volume 438-440
Issue SPEC. ISS.
Start page 43
End page 47
Total pages 5
Subject 2500 Materials Science
Abstract The most significant characteristic of a martensitic transformation is the macroscopic change in shape of the region transformed-the shape strain. This results in a strain energy that opposes the transformation. The strain energy associated with a martensitic transformation can be calculated using the Eshelby equations for the strain energy of an oblate spheroid. The first aspect of the shape strain discussed in the paper is the reduction in the strain energy that results from the imposition of an appropriate applied stress-the familiar phenomenon of stress-induced martensitic transformation. An improved model for transformation toughening, which is based on using knowledge of the shape strain to calculate the characteristics of a stress-induced transformation, is described. The shape strain also dominates the crystallographic theories of the martensite transformation via the invariant plane strain concept that forms the basis of the very successful phenomenological theory of martensitic transformations (PTMT) developed just over half a century ago. This occurs when the transformed ellipsoid is infinitely thin (thickness to radius ratio t/R = 0) and effectively ignores the surface energy of the interface. The paper explores the consequences of allowing the t/R ratio to become finite and including a surface energy term. The analysis shows how this may be able to account for some of the characteristics of ferrous martensite that have, up to now, eluded explanation using the PTMT.
Keyword Edge-to-edge matching
Habit plane
Strain energy
Surface energy
Transformation toughening
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 26 Jul 2016, 02:32:01 EST by System User