Dynamic model of supersonic martensitic crystal growth

Кащенко, М. П.; Чащина, В. Г.

doi:10.3367/ufnr.0181.201104a.0345

Cited by 19 publications

(17 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recall that in [4,5], the most symmetric variant was analyzed in which the unit vectors n 1 and n 2 of the control waves were chosen strictly along the symmetry axes of the second and fourth orders, that is, n 1 || [110] α and n 2 ||[001] α . Then the application of the elastic moduli C 11 = 134 hPа, C 12 = 110 hPа, and C 44 = 36 hPа for the BCC titanium single crystal at a temperature of 1238 K taken from [8] allows us to find the unit vector N w to the HP close to [22 3 ] α (the component with [22 3 ] α has an angle of ≈0.7°) from the formula (see [1,2])…”

Section: ─3mentioning

confidence: 99%

“…In the theory [1,2], the HP has purely dynamic interpretation. It is enclosed by the moving line of crossing of superimposed fronts of wave beams propagating in orthogonal directions and bearing flat tension (ε 1 > 0)-compression (ε 2 < 0) strain possessing invariant planes (with strain ε 3 ≈ 0).…”

Section: Introductionmentioning

confidence: 99%

“…In the dynamic approach first applied to the γ-α MT in iron alloys [1,2], the most convenient and evident is a description of the habitus planes (HPs). In this case, it is suffice to consider the threshold regime without transition to finishing strains.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal dynamics of forming ε-martensite with {334}α habitus planes in titanium

2013

View full text Add to dashboard Cite

Section: ─3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crystal dynamics of forming ε-martensite with {334}α habitus planes in titanium

2013

View full text Add to dashboard Cite

“…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%

“…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%

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.

View full text Add to dashboard Cite

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.

show abstract