Dynamic model of the formation of twinned martensite crystals: I. Control wave process and the removal of degeneracy in twin-boundary orientation

Кащенко, М. П.; Чащина, В. Г.; Вихарев, Сергей Викторович

doi:10.1134/s0031918x10090024

Cited by 16 publications

(4 citation statements)

References 15 publications

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“…2 underlines that incorporation of ℓ -waves and s-waves into the mechanism of the CWP allows one to correctly describe the twinned martensite crystals formation. Both the formation of the basic component of twin structure and the crystal growth occur at supersonic speeds [5,[24][25][26].…”

Section: Fig 1 Key Position Of the Concept Of Initial Excited State I...mentioning

confidence: 99%

Fundamental Achievements of the Dynamic Theory of Reconstructive Martensitic Transformations

Кащенко¹,

Чащина²

2013

MSF

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Basic directions in the theory of martensitic transformations are briefly listed. Solutions of several important problems in the context of dynamic theory of reconstructive martensitic transformations are reviewed. The FCC-BCC (BCT) transformation in iron alloys is used as an example. Main attention is paid to concept links. In particular, the key role of the concept of initial exited state for realization of transformations with crystal growth at supersonic speed is shown. The leading value of this concept both for calculation of critical rates of austenite cooling and for estimation of scales of incubatory times at bainitic transformation is marked as well.

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Section: Fig 1 Key Position Of the Concept Of Initial Excited State I...mentioning

confidence: 99%

Fundamental Achievements of the Dynamic Theory of Reconstructive Martensitic Transformations

Кащенко¹,

Чащина²

2013

MSF

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“…For the readers convenience we recall, in a qualita tive way, part of the dynamic approach [5][6][7][8][9][10] ideol ogy, which is based on the supersonic martensitic crys tal growth model. A crystal forms during the propaga tion of the control wave process (CWP) that carries a threshold deformation that destroys the prior austen ite stability in the lamellar region.…”

Section: Dynamic Theory Of the Formation Of Twinned Martensite Crystalsmentioning

confidence: 99%

“…CONCLUSIONS (1) An analysis of the variations in the twin compo nent fraction speaks in favor of the ideas of the mar tensitic transformation developed in dynamic theory [5][6][7][8][9][10]. This theory not only naturally explains the presence of the optimal value of the parameter δ tw = (δ tw ) id , but easily discloses probable physical reasons for the observed deviations from the (δ tw ) id , including the case when transformation twins are absent.…”

Section: Absence Of Transformation Twins In Thin Plate Like Martensitmentioning

confidence: 99%

“…The purpose of this study is to show that the dynamical MT theory developed within the new para digm [5][6][7][8][9][10] makes it possible to naturally explain the observed features of the twinned crystals formation, including the absence of twinning observed, albeit rarely, in the experiments in [4] dedicated to the induction of MT in strong pulsed magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

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Key role of transformation twins in comparison of results of crystal geometric and dynamic analysis for thin-plate martensite

Кащенко

Чащина

2013

Phys. Metals Metallogr.

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821 INTRODUCTIONThe crystal geometric approach to describing the macroscopic morphological features of martensite crystals (habit plane, macroshift, orientation relation ships (OR)) was proposed in [1]. The fundamental postulate of the approach declares the habit plane to be the macroscopically invariant one. The most impressive success of this approach was the prediction of the need for crystal twinning and the calculation of the fraction ratio β tw of transformation twins in crys tals with habits {3 10 15} γ , which were observed for the first time in [2] in the alloy Fe-22Ni-0.8C dur ing γ-α martensite transformation (MT). It must be emphasized that, according to [1], a particular habit plane is associated with a well defined (fixed) value of β tw . However, it was shown in experiments [3] that the β tw value varies not only during the transition from crystal to crystal, but also within the same crystal. Actually, this fact is well known by metal physicists and clearly seen in the images of the observed twinned structures of thin plate like crystals, examples of which taken from [3] and [4] are shown in Figs. 1 and 2. Figures 1 and 2 show that, although there is a ten dency toward regularity, the twin structure is not strictly regular, but this fact does not exclude its exist ence as an ideal limiting case.It should be noted that the authors of [3] did not restrict themselves to the fact that β tw varies but also undertook measurements, which evinced that the vol ume fraction of twin component δ tw showed variation between 0.37 < δ tw < 0.46. Since the expected value of δ tw based on [1] Abstract-The experimental data on the ratio of transformation twins fractions for crystals of thin plate α martensite (with the habit planes of the {2 5 9} γ -{3 10 15} γ type) are considered. It is shown that the dynamic theory of the martensite crystals formation is free from the difficulties encountered in the formal crystal geometric approach. The intervals of parameter values that correspond to the observed fractions of the twin component, δ tw , within the same crystal are given. The absence of twinning in thin plate like crystals, which sometimes are observed in experiments on the γ-α martensite transformation induced by strong mag netic field is discussed.

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Modeling of martensitic phase transformation accounting for inertia effects

Liu,

Schneider,

Reder

et al. 2024

International Journal of Mechanical Sciences

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Dynamic model of the formation of twinned martensite crystals: I. Control wave process and the removal of degeneracy in twin-boundary orientation

Cited by 16 publications

References 15 publications

Fundamental Achievements of the Dynamic Theory of Reconstructive Martensitic Transformations

Fundamental Achievements of the Dynamic Theory of Reconstructive Martensitic Transformations

Key role of transformation twins in comparison of results of crystal geometric and dynamic analysis for thin-plate martensite

Modeling of martensitic phase transformation accounting for inertia effects

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