Texture Memory in Si-Mn and ODS Steels Observed In Situ by Pulsed Neutron and Synchrotron X-Ray Diffractions and Prediction by Double Kurdjumov-Sachs Relation: A Concept for Intense Variant Selection

Tomida, Toshiro; Vakhitova, Elena; Sornin, Denis; Wright, Jonathan P.; François, Manuel; Onuki, Yusuke; Hirano, Takashi; Hoshikawa, Akinori; Ishigaki, Tōru; Sato, Sadao

doi:10.1007/s11661-021-06140-9

Cited by 3 publications

(8 citation statements)

References 29 publications

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“…This can be caused by higher mobility of the incoherent interphase boundaries [17]. In an oxide dispersed steel (ODS) steel, this type of growth explained the observed strong texture memory effect well [13,36].…”

Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 96%

“…When a child phase nucleates on a grain boundary of a parent phase, the nucleus may hold an orientation relationship with not only one parent grain into which it grows but also one or more adjacent parent grains allowing a certain deviation from the orientation relation (up to around 10 • ) to further reduce interphase boundary energy. This hypothesis has been made for the transformation between α-f and γ in steel, called the double K-S relation (DKS) [3,35,36], and the texture prediction based on DKS has quantitatively explained various transformation textures such as those in hot-rolled steels [35,37] and texture memory effects in hot-rolled [3,14,36], cold-rolled [3], extruded [36], and ECAP(equal channel angular pressing)-processed [38] steels. DKS has been experimentally observed by 2D- [14,15] and 3D-EBSD [16,17] as well as 3D synchrotron X-ray measurement recently [39].…”

Section: Dbormentioning

confidence: 99%

“…Here, we adapt the mathematical scheme of DKS for fcc/bcc transformations [3,36] to DBOR for hexagonal metals exhibiting hcp/bcc transformations. Let us assume α-hex→β transformation for the mathematical formulation.…”

Section: Dbormentioning

confidence: 99%

“…The local volume conservation, which strictly occurs for martensite transformation, is a reasonably good approximation for diffusional transformation, and it has been successfully used in the predictions of various transformation textures in steels as mentioned above [3,[35][36][37][38].…”

Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 99%

“…However, the growth of nuclei during diffusional or reconstructive transformation may not occur by the migration of coherent interfaces, rather it can occur towards neighbor grains to which growth fronts are incoherent or semi-coherent, as shown in Figure 1c, and the growth may not be confined within one parent grain [36]. This can be caused by higher mobility of the incoherent interphase boundaries [17].…”

Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 99%

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Texture Memory in Hexagonal Metals and Its Mechanism

Tomida

Vogel

Onuki

et al. 2021

Metals

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Texture memory is a phenomenon in which retention of initial textures occurs after a complete cycle of forward and backward transformations, and it occurs in various phase-transforming materials including cubic and hexagonal metals such as steels and Ti and Zr alloys. Texture memory is known to be caused by the phenomena called variant selection, in which some of the allowed child orientations in an orientation relationship between the parent and child phases are preferentially selected. Without such variant selection, the phase transformations would randomize preferred orientations. In this article, the methods of prediction of texture memory and mechanisms of variant selections in hexagonal metals are explored. The prediction method using harmonic expansion of orientation distribution functions with the variant selection in which the Burgers orientation relationship, {110}β//{0001}α-hex <11¯1>β//21¯1¯0α-hex, is held with two or more adjacent parent grains at the same time, called “double Burgers orientation relation (DBOR)”, is introduced. This method is shown to be a powerful tool by which to analyze texture memory and ultimately provide predictive capabilities for texture changes during phase transformations. Variation in nucleation and growth rates on special boundaries and an extensive growth of selected variants are also described. Analysis of textures of commercially pure Ti observed in situ by pulsed neutron diffraction reveals that the texture memory in CP-Ti is indeed quite well predicted by consideration of the mechanism of DBOR. The analysis also suggests that the nucleation and growth rates on the special boundary of 90° rotation about 21¯1¯0α-hex should be about three times larger than those of the other special boundaries, and the selected variants should grow extensively into not only one parent grain but also other grains in α-hex(hexagonal)→β(bcc) transformation. The model calculations of texture development during two consecutive cycles of α-hex→β→α-hex transformation in CP-Ti and Zr are also shown.

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Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 96%

Section: Dbormentioning

confidence: 99%

Section: Dbormentioning

confidence: 99%

Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 99%

Section: Extended Concept Of Double Bor (Edbor)mentioning

confidence: 99%

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Texture Memory in Hexagonal Metals and Its Mechanism

Tomida

Vogel

Onuki

et al. 2021

Metals

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A novel complex-structure Co-free Cr-Fe-Ni-Al-Si-Ti-Cu high entropy alloy with outstanding mechanical properties in as-cast and cold-rolled states

Zhang

Lei

et al. 2023

Materials Characterization

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The Role of Parent Phase Topology in Double Young–Kurdjumow–Sachs Variant Selection during Phase Transformation in Low-Carbon Steels

Kestens

Minh

Petrov

2022

Metals

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The present paper investigates the role of parent phase topology on a crystallographic variant selection rule. This rule assumes that product phase nuclei appear at certain grain boundaries in the parent structure, such that a specific crystallographic orientation relationship is observed with both parent grains at either side of the grain boundary. The specific crystallographic orientation correspondence considered here is the Young–Kurdjumow–Sachs (YKS) orientation relationship <112>90° (which exhibits 24 symmetrical equivalents). The aforementioned relationship is characteristic of phase transformations in low-carbon steel grades. It is shown that, for different parent phase textures, ~20% of the grain boundaries comply with the double YKS condition allowing for a tolerance of 5°, ignoring the presence of topology in the parent phase microstructure. The presented model allows for connecting the presence of a specific parent phase topology with the condition of the double YKS variant selection rule in a number of practical cases: (i) for hot rolled Ti–Interstitial Free (IF) steel with and without Mn addition, (ii) for cold rolled IF steel exhibiting very strong texture memory after forward and reverse α ⇌ γ phase transformation and (iii) for a martensitic transformation in a Fe–8.5% Cr steel. It is shown that the double YKS variant selection criterion may explain several specific features of the observed transformation textures, while assuming a non-correlated arbitrary pair topology of the parent austenite structure (implying that for N parent orientations N/2 pairs are selected in an arbitrary manner).

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Texture Memory in Si-Mn and ODS Steels Observed In Situ by Pulsed Neutron and Synchrotron X-Ray Diffractions and Prediction by Double Kurdjumov-Sachs Relation: A Concept for Intense Variant Selection

Cited by 3 publications

References 29 publications

Texture Memory in Hexagonal Metals and Its Mechanism

Texture Memory in Hexagonal Metals and Its Mechanism

A novel complex-structure Co-free Cr-Fe-Ni-Al-Si-Ti-Cu high entropy alloy with outstanding mechanical properties in as-cast and cold-rolled states

The Role of Parent Phase Topology in Double Young–Kurdjumow–Sachs Variant Selection during Phase Transformation in Low-Carbon Steels

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