An advanced approach to reconstructing parent orientation maps in the case of approximate orientation relations: Application to steels

Germain, Lionel; Gey, Nathalie; Mercier, Reuben; Blaineau, Pierre; Humbert, Michel

doi:10.1016/j.actamat.2012.04.034

Cited by 134 publications

(107 citation statements)

References 25 publications

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“…This artefact, clearly due to the cropped squares used in the reconstructed mapping, may be avoided after a semi-automated completion, as carried out in [26]. However, this additional step is not performed in the present procedure, mainly because it would require a manual grain-by-grain examination and therefore a longer processing time involving the user.…”

Section: Experimental Validationmentioning

confidence: 99%

“…In this respect, crystallographic approaches for recovering the  microstructure based on  orientation maps measured by EBSD offer the possibility of directly inferring the parent  microstructure from the inherited one [22][23][24][25][26]. The essence of these methods is based on the crystallographic correspondence between the parent grain and the bcc-type product orientation (martensite or bainite).…”

Section: Introductionmentioning

confidence: 99%

“…The basic principles of the  reconstruction process as well as the advantages of each approach have been reviewed by Germain et al [28]. The reconstruction can be based on the use of average orientations within inherited grains [26] or the local orientation of every pixel [25]. Although the use of averaged orientations of inherited grains reduces computation time, a reconstruction on a local scale (i.e., pixel-based) is preferable because it allows the orientation gradient within  grains to be taken into account in the reconstruction process in highly deformed steels.…”

Section: Introductionmentioning

confidence: 99%

“…This methodology has been successfully applied to two low-carbon steels. A combination of the strong points of these two existing models, i.e., the local pixel-by-pixel analysis proposed by Miyamoto et al [25] and the nuclei identification and spreading strategy proposed by Germain et al [26], is expected to give rise to a more accurate  reconstruction. This is the basis of the alternative approach developed in the present study and presented in section 3.1.…”

Section: Introductionmentioning

confidence: 99%

“…Although the use of averaged orientations of inherited grains reduces computation time, a reconstruction on a local scale (i.e., pixel-based) is preferable because it allows the orientation gradient within  grains to be taken into account in the reconstruction process in highly deformed steels. On the other hand, the parent orientation determination in [25] is based on a one-step minimisation of the angular deviation between the experimental  orientations and the predicted ones, whereas the approach in [26] relies on a robust two-step algorithm. The first step in the latter procedure consists of an unambiguous determination of the parent orientations -or nuclei -with a low tolerance.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Crystallographic Reconstruction Study of the Effects of Finish Rolling Temperature on the Variant Selection During Bainite Transformation in C-Mn High-Strength Steels

Bernier

Bracke

Malet

et al. 2014

Metall Mater Trans A

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The effect of finish rolling temperature (FRT) on the austenite-(  ) to-bainite ( ) phase transformation is quantitatively investigated in high-strength C-Mn steels. In particular, the present study aims to clarify the respective contributions of the  conditioning during the hot rolling and the variant selection (VS) during the phase transformation to the inherited texture.To this end, an alternative crystallographic  reconstruction procedure, which can be directly applied to experimental electron backscatter diffraction (EBSD) mappings, is developed by combining the best features of the existing models: the orientation relationship (OR) refinement, the local pixel-by-pixel analysis and the nuclei identification and spreading strategy. The applicability of this method is demonstrated on both quenching and partitioning (Q&P) and as-quenched lath-martensite steels. The results obtained on the C-Mn steels confirm that the sample finish rolled at the lowest temperature (829°C) exhibits the sharpest transformation texture. It is shown that this sharp texture is exclusively due to a strong VS from parent brass {110}<1-12>, S {213}<-3-64> and Goss {110}<001> grains, whereas the VS from the copper {112}<-1-11> grains is insensitive to the FRT. In addition, a statistical VS analysis proves that the habit planes of the selected variants do not systematically correspond to the predicted active  slip planes using the Taylor model. In contrast, a correlation between the Bain group to which the selected variants belong and the FRT is clearly revealed, regardless of the parent orientation. These results are discussed in terms of polygranular accommodation mechanisms, especially in view of the observed development in the hot-rolled samples of high-angle grain boundaries with misorientation axes between <111>  and <110>  .

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Section: Experimental Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Crystallographic Reconstruction Study of the Effects of Finish Rolling Temperature on the Variant Selection During Bainite Transformation in C-Mn High-Strength Steels

Bernier

Bracke

Malet

et al. 2014

Metall Mater Trans A

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Microtexture of Ti6Al4V Obtained by Direct Energy Deposition (DED) Process

Weiss

Acquier

Germain

et al. 2016

Proceedings of the 13th World Conference on Titanium

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The microstructure of bulk samples prepared by CLAD® additive manufacturing of Ti-6Al-4V (Ti64) powder have been investigated by means of SEM and phase reconstruction. The CLAD® technique (laser blown powder processing) developed at IREPA LASER provides very high cooling rate promoting the formation of the martensitic ' phase in the form of thin needles. Using Merengue 2 software developed at LEM3, the analysis of the martensitic phase orientation by EBSD enables the reconstruction of the primary -phase that formed at high temperature. Microstructural observations performed at various locations within the samples revealed marked heterogeneities in the microstructure. After the first deposited layer characterized by fine and equiaxed grains, the grains located in the central region of the samples tend to grow in a direction perpendicular to the deposited layer plan with a coarse columnar structure. By opposition, the grains on the sample side were found to grow at angle of about 60° from the deposited layer plan. The main difference with others additive manufacturing techniques is that, only a weak crystallographic texture was detected in these samples prepared by CLAD®.

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Microstructure and Mechanical Properties of Ti‐6Al‐4V Laser Welds for Airplane Floor Manufacturing Application

Kandaoui¹,

Scandella²,

Germain³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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An advanced approach to reconstructing parent orientation maps in the case of approximate orientation relations: Application to steels

Cited by 134 publications

References 25 publications

Crystallographic Reconstruction Study of the Effects of Finish Rolling Temperature on the Variant Selection During Bainite Transformation in C-Mn High-Strength Steels

Crystallographic Reconstruction Study of the Effects of Finish Rolling Temperature on the Variant Selection During Bainite Transformation in C-Mn High-Strength Steels

Microtexture of Ti6Al4V Obtained by Direct Energy Deposition (DED) Process

Microstructure and Mechanical Properties of Ti‐6Al‐4V Laser Welds for Airplane Floor Manufacturing Application

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