Journal ArticleDOI
Crystallography of the martensite transformation in Fe−Al−C alloys
M. Watanabe,C. M. Wayman +1 more
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In this paper, the authors have made measurements on highly tetragonal bct martensite in two Fe−Al−C steels and the results have been interpreted in terms of the phenomenological crystallographic theory of Martensite formation.Abstract:
Crystallographic measurements on highly tetragonal bct martensite in two Fe−Al−C steels have been made and the results have been interpreted in terms of the phenomenological crystallographic theory of martensite formation. Agreement between theory and experiment was found to be excellent. Of particular interest is the high martensite tetragonality (c/a→1.14) in aluminum-steels compared to others. Because of this the principal distortions of the Bain deformation are substantially smaller and consequently the magnitudes of the shape and lattice invariant deformations are reduced considerably. Measurements of the dilatation parameter δ indicate that the shape deformation is not significantly different from an invariant plane strain.read more
Citations
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Self-accommodation in martensite
TL;DR: In this paper, the authors derived necessary and sufficient conditions that the lattice parameters of a material must satisfy for the material to form a self-accommodating microstructure and showed that if the austenite is cubic, then it is possible to construct any micro-structure that is self-ACCOMMODating unless the transformation strain or the Bain strain satisfies additional, rather strict, conditions.
Journal ArticleDOI
Wedge-like microstructure in martensites
TL;DR: In this paper, the Hadamard jump condition is used to characterize coherent interfaces of martensites and it is shown that only very special materials whose lattice parameters satisfy certain highly restrictive conditions can form the wedge-like microstructure.
Journal ArticleDOI
The thermoelastic martensitic transformation inβ′ Ni-Al alloys: I. Crystallography and morphology
S. Chakravorty,C.M. Wayman +1 more
TL;DR: In this article, a study of the crystallographic features of the thermoelastic martensitic transformation in β′ Ni-Al alloys is described, and the results are found to be in good agreement with the predictions of the Bowles-Mackenzie phenomenological theory.
Journal ArticleDOI
Substructures of lenticular martensites with different martensite start temperatures in ferrous alloys
TL;DR: The authors investigated the substructures of lenticular martensites with different martensite start temperatures (Ms) by transmission electron microscopy, and found that the change in the substructure of the lenticular Martensite presumably resulted from the local temperature rise in the martensitic plate.
Journal ArticleDOI
Local orientation change inside lenticular martensite plate in Fe–33Ni alloy
TL;DR: The orientation of lenticular martensite (M) with respect to austenite (A) is nearly Greninger-Troiano at the midrib and twinned region but gradually deviates towards Kurdjumov-Sachs near the M/A interface as mentioned in this paper.
References
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Journal ArticleDOI
The crystallography of martensite transformations II
J.S Bowles,J.K Mackenzie +1 more
TL;DR: In this paper, the total strain in a martensite transformation was derived from the orientation relationship and the component strains, together with the correspondence, and the dimensions of the initial and final structures.
Journal ArticleDOI
The crystallography of martensite transformations III. Face-centred cubic to body-centred tetragonal transformations
J.S Bowles,J.K Mackenzie +1 more
TL;DR: In this paper, the theory developed in Parts I and II is applied to transformations from face-centred cubic to body-centered tetragonal in the alloys Fe-C, Fe-Ni, Fe -Ni-C. The theoretical predictions of habit planes, orientation relationships and directions of the homogeneous strain are found to be in satisfactory agreement with all the available experimental data.
Journal ArticleDOI
Measurement of the shape strain for the (225) and (259) martensitic transformations
D.P Dunne,D.P Dunne,J.S Bowles +2 more
TL;DR: In this article, the shape strain was measured for an Fe-Ni-C alloy having a (259) F habit plane and for Fe-Mn-C and Fe-C alloys, both of which have (225) F habits planes.
Journal ArticleDOI
Theoretical and experimental aspects of the “(225)” austenite-martensite transformation in iron alloys
A.J Morton,C.M. Wayman +1 more
TL;DR: In this article, the authors show that a uniform dilatation is more consistent with observations than the case where the interface is one of zero-average distortion (δ = 1).
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Measurement of the shape strain for the (225) and (259) martensitic transformations
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