The mechanisms of the fcc–bcc martensitic transformation revealed by pole figures

Cayron, Cyril; Barcelo, Françoise; Carlan, Y. de

doi:10.1016/j.actamat.2009.10.046

Cited by 79 publications

(52 citation statements)

References 35 publications

(44 reference statements)

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“…This could also imply a significant difference in the character of the dislocations forming the individual lath boundaries [30] . A new theory by Cayron et al [32] suggests that the continuous features in pole figures correspond to a trace of the transformation mechanisms. According to this theory austenite to martensite or bainite transformation is not a single step transformation, but occurs in two steps: an fccehexagonal close-packed (hcp) step followed by an hcpebcc step.…”

Section: Discussionmentioning

confidence: 98%

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Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Suikkanen¹,

Cayron

DeArdo

et al. 2013

Journal of Materials Science & Technology

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Section: Discussionmentioning

confidence: 98%

“…One could speculate that the low-angle boundary structure can be simply explained by the plasticity of parent austenite [32] or accommodation of transformation strain in the product phase [33] . This could also imply a significant difference in the character of the dislocations forming the individual lath boundaries [30] .…”

Section: Discussionmentioning

confidence: 98%

Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Suikkanen¹,

Cayron

DeArdo

et al. 2013

Journal of Materials Science & Technology

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“…Thus in FeMnC and FeCrNi alloys [30][31][32] a two-step pathway via an intermediate hcp phase was identified. Also in theoretical work, transformation processes were proposed that involve an intermediate switching between various orientation relationships.…”

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confidence: 99%

Martensitic transformation of pure iron at a grain boundary: Atomistic evidence for a two-step Kurdjumov-Sachs–Pitsch pathway

Meiser

Urbassek

2016

AIP Advances

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Using classical molecular dynamics simulations and the Meyer-Entel interaction potential, we study the martensitic transformation pathway in a pure iron bi-crystal containing a symmetric tilt grain boundary. Upon cooling the system from the austenitic phase, the transformation starts with the nucleation of the martensitic phase near the grain boundary in a plate-like arrangement. The Kurdjumov-Sachs orientation relations are fulfilled at the plates. During further cooling, the plates expand and merge. In contrast to the orientation relation in the plate structure, the complete transformation proceeds via the Pitsch pathway.

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“…For this reason, caution must always be exercised in drawing conclusions relating to variant selection from ESBD observations. Cayron et al 51 recently attributed the spread or 'rings' observed in their pole figure to two-stage transformation of the martensite, a conclusion subsequently shown 33 probably to be incorrect.…”

Section: Problems In Identifying Variants Using Ebsd Techniquementioning

confidence: 99%

CRITICAL ASSESSMENT 1: Outstanding issues in crystallographic variant selection in displacive transformations

Kundu

2014

Materials Science and Technology

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Variant selection has been a well researched subject in metallurgy and materials science in recent decades. The emergence of experimental techniques capable of determining crystallographic orientation at the grain level has provided insight into the fundamental processes underlying variant selection. The theory, however, is far from complete. Fundamental questions, such as the specific roles of stress and strain in variant selection, have yet to be fully resolved. It remains unclear whether variant selection is a nucleation controlled phenomenon or growth controlled. The possibility of using unconventional forces such as magnetic or electrical fields to influence variant selection is of interest, but needs further research. Any phenomenon related to phase transformation gains importance only when it can be controlled to improve material properties, and it is still unclear how variant selection can be applied to this end. The literature is critically assessed and an attempt is made to identify areas for future research with potential to allow effective application of variant selection.

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The mechanisms of the fcc–bcc martensitic transformation revealed by pole figures

Cited by 79 publications

References 35 publications

Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C–2.0Mn–1.5Si–0.6Cr Steel Using EBSD

Martensitic transformation of pure iron at a grain boundary: Atomistic evidence for a two-step Kurdjumov-Sachs–Pitsch pathway

CRITICAL ASSESSMENT 1: Outstanding issues in crystallographic variant selection in displacive transformations

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