In-Situ Observation of Texture Changes during Phase Transformations in Ultra-Low-Carbon Steel

Wenk, Hans‐Rudolf; Huensche, I.; Kestens, Léo

doi:10.1007/s11661-006-9033-1

Cited by 40 publications

(31 citation statements)

References 33 publications

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“…The presence of strong texture through the phase transformation indicates that variant selection is active for the bcc Fe to fcc Fe phase transformation, as has been previously observed in ultra-low carbon steel. 53 The 110 maximum in the fcc phase remains the same with continued heating and deformation. This texture can also be generated by slip on {111}〈110〉 and is the typical compression texture in fcc metals.…”

Section: Iii-iv High Temperature Texturementioning

confidence: 95%

In situ phase transformation and deformation of iron at high pressure and temperature

Miyagi

Kunz

Knight

et al. 2008

Journal of Applied Physics

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With a membrane based mechanism to allow for pressure change of a sample in a radial diffraction diamond anvil cell (rDAC) and simultaneous infra-red laser heating, it is now possible to investigate texture changes during deformation and phase transformations over a wide range of temperature-pressure conditions. The device is used to study bcc (α), fcc (γ) and hcp (ε) iron. In bcc iron, room temperature compression generates a texture characterized by (100) and (111) poles parallel to the compression direction. During the deformation induced phase transformation to hcp iron, a subset of orientations are favored to transform to the hcp structure first and generate a texture of (01-10) at high angles to the compression direction. Upon further deformation, the remaining grains transform, resulting in a texture that obeys the Burgers relationship of (110) bcc // (0001) hcp . This is in contrast to high temperature results that indicate that texture is developed through dominant pyramidal 〈a+c〉 {2-1-12}〈2-1-13〉 and basal (0001)〈2-1-10〉 slip based on polycrystal plasticity modeling. We also observe that the high temperature fcc phase develops a 110 texture typical for fcc metals deformed in compression.

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Section: Iii-iv High Temperature Texturementioning

confidence: 95%

In situ phase transformation and deformation of iron at high pressure and temperature

Miyagi

Kunz

Knight

et al. 2008

Journal of Applied Physics

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“…For example, ferrite-to-austenite transformation occurring in an intercritical annealing range is known to indicate the memory effect. [3][4][5][6] There must be a rule that determines austenite orientation in relation to the initial ferrite texture. The variant selection of austenite during reverse transformation has been discussed in the literatures and several models have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of the Three-dimensional Ferrite–austenite Microstructure and Crystallographic Analysis in the Early Stage of Reverse Phase Transformation in an Fe–Mn–C Alloy

et al. 2018

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We have investigated the crystallographic orientation relationship between ferrite and austenite and the interfacial planes between them of a low-carbon steel formed by the transformation from ferrite to austenite upon heating. Three-dimensional investigation using EBSD measurement with FIB serial sectioning technique is carried out on samples quenched from an early stage of the reverse transformation. The prior austenite orientation of martensite in the quenched microstructure is determined based on an analysis of the variants in the Kurdjumov-Sachs (K-S) relationship and the three-dimensional ferrite-austenite microstructure is successfully reconstructed. The crystallographic analysis on the three-dimensional microstructure has revealed that the nucleus of reverse-transformed austenite maintains the K-S relationship or close to it with two or three adjacent ferrite grains. The significance for reverse-transformed austenite to select these specific orientation relationships was estimated through a statistical assessment. In addition, the influence of crystallographic relationship between ferrite and austenite to nucleation and growth of reverse transformation is discussed.

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“…The mechanism of variant selection of transforming γ has been discussed in the literature. In studies on the texture memory effect during α−γ−α transformation [14][15][16][17][18][19][20][21][22] , it is commonly suggested that the γ texture after the reverse transformation is not randomly selected but is determined under the rule on the variant selection of transforming γ. Various models to explain the variant selection rules of transforming γ during reverse transformation have been proposed.…”

Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> EBSD Analysis on the Crystal Orientation Relationship between Ferrite and Austenite during Reverse Transformation of an Fe-Mn-C Alloy

et al. 2016

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The crystal orientation of nucleating austenite during reverse phase transformation of a C-Mn steel has been investigated by in situ EBSD technique using a heating stage of FE-SEM at temperatures ranging from RT to 800 C. It has been found that the multiple interfaces between a nucleating austenite grain and the surrounding parent ferrite grains are preferentially selected as the Kurdjumov-Sachs (K-S) relationship. More than 50% of austenite grains are surrounded with two or more parent ferrite grains satisfying the K-S relationship with a deviation within 7 . Based on these ndings, a nucleation model at triple junction is proposed, which supposes that the orientation of nucleating austenite is selected to satisfy the K-S relationship or the orientation relationship close to K-S relationship at two of the interfaces to ferrite grains, and at the other interfaces to minimize the misorientation from the K-S relationship.

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In-Situ Observation of Texture Changes during Phase Transformations in Ultra-Low-Carbon Steel

Cited by 40 publications

References 33 publications

In situ phase transformation and deformation of iron at high pressure and temperature

In situ phase transformation and deformation of iron at high pressure and temperature

Reconstruction of the Three-dimensional Ferrite–austenite Microstructure and Crystallographic Analysis in the Early Stage of Reverse Phase Transformation in an Fe–Mn–C Alloy

<i>In Situ</i> EBSD Analysis on the Crystal Orientation Relationship between Ferrite and Austenite during Reverse Transformation of an Fe-Mn-C Alloy

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