Orientation relationship between austenite and bainite in a multiphased steel

Cabus, C.; Réglé, H.; Bacroix, Brigitte

doi:10.1016/j.matchar.2006.05.016

Cited by 41 publications

(20 citation statements)

References 8 publications

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“…The section of the ODF at u 2 = 45 deg generated starting from copper oriented grains using final activity criterion (with a tolerance of 15 deg) is shown on the first section of Figure 5(a). The general trend of the local texture measurements in steels, published by Cabus et al, [27] is reproduced by the simulation results. Particularly, the rotated Goss orientation (110)h110i (lower left corner) disappears according to experimental transformation products.…”

Section: Deformed Materialssupporting

confidence: 65%

“…The results obtained from copper oriented grains are compared with measurements published by Cabus et al, [27] where the (110)h110i (rotated Goss) orientation is present, which was absent on the no-RX range deformed material. The general trend of experimental data is reproduced by the simulation and they suggest that a variant selection mechanism is more intense when the austenite is deformed before the phase transformation than recrystallized.…”

Section: Recrystallized Materialsmentioning

confidence: 71%

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Transformation Textures in Steels: A Simulation Based on Micromechanical Modeling Data

Roatta

Fourty

Bolmaro

2009

Metall Mater Trans A

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The phase transformation of low-carbon steels is evaluated by means of computer simulations performed with a viscoplastic self-consistent (VPSC) code. The simulations allow calculating micromechanical data at high-temperature deformation that are currently inaccessible through experiments. The micromechanical data are later on used in phase transformation computer codes to evaluate the pre-eminence of certain transformation variants following different criteria. The texture results are compared with experimental results available in the literature. The main fibers and components develop and behave differently depending on the selection of hardening laws, fragmentation criteria, active slip systems, etc. The results are compatible with high-temperature textures characteristic of a high stacking fault energy (HSFE)-like alloy and selection of variants based on the activity of the high-temperature slip systems.

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Section: Deformed Materialssupporting

confidence: 65%

Section: Recrystallized Materialsmentioning

confidence: 71%

Transformation Textures in Steels: A Simulation Based on Micromechanical Modeling Data

Roatta

Fourty

Bolmaro

2009

Metall Mater Trans A

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“…Note that KS variants share parallel close-packed planes (CPs) and parallel close-packed direction (CDs) with the parent grain. However, ORs intermediate between KS and NW are usually measured in steels from EBSD and TEM experimental studies [e.g., [37][38][39].…”

Section: Principlementioning

confidence: 99%

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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“…This detailed study will focus mostly on those retained austenite grains that had a neighbour transformation product with the misorientation angle within the 0-5°interval. A higher tolerance angle might improve the statistics of the results and in studies where it is investigated if a certain misorientation relationship is followed, such as studies on selective growth during recrystallization or when spreads around ideal texture components are applied, often a higher tolerance angle such as 10°3 8,49) or 15°, [50][51][52] the latter one corresponding to the maximum misorientation of a low angle grain boundary, is used. In this case, however, a tolerance angle of 5°was chosen because this tolerance is, as was illustrated in Fig.…”

Section: Evaluation Of Variant Selectionmentioning

confidence: 99%

Evaluation of the Crystallographic Orientation Relationships between FCC and BCC Phases in TRIP Steels

2009

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The crystallographic orientation relationships that are active during the transformation of austenite to bainite are studied for two TRIP steels by means of Electron BackScatter Diffraction (EBSD). A detailed evaluation of about 360 retained austenite grains and their BCC neighbours was performed. Three relationships were considered, namely Kurdjumov-Sachs, Nishiyama-Wassermann and Pitsch. It was found that the majority of the austenite grains had at least one neighbour that could be related with one of the three orientation relationships. The Kurdjumov-Sachs relationship appeared to be dominant and no strong indication for variant selection could be retrieved from the studied data. It was, however, also demonstrated that some precautions need to be made since a clear distinction between the evaluation of a small region of the microstructure and conclusions made for the complete material is necessary.KEY WORDS: TRIP steels; EBSD; phase transformation; crystallographic orientation relationships. 1601© 2009 ISIJ KS variants. The number of variants for the other orientation relationships can be deduced in a similar way. A g-a orientation relationship actually represents a misorientation between two crystallographic orientations. Therefore, this misorientation is most frequently described by means of an axis/angle pair ͗d͘w. Consequently, the last column of Table 1 gives the axis/angle representation with the minimum misorientation angle of the different orientation relationships.The Bain orientation relationship is the simplest orientation relationship, but it is never observed in steels. Therefore, this orientation relationship serves as a first approximation or a reference point when the transformation of austenite into a BCC phase is studied. Mostly, the Kurdjumov-Sachs and the Nishiyama-Wassermann relationships are used when the orientation relations between FCC and BCC phases are studied. Although there has been a lot of recent research [10][11][12][13][14][15][16][17][18][19] concerning which of these orientation relationships prevails, there is still considerable debate on the relative importance of these orientation relationships because the angular differences between the different orientation relationships is small which makes the experimental verification difficult. Recently, also other orientation relationships 5,6) were taken into account during the study of the crystallographic aspects of the FCC-BCC phase transformation. 10,20) An overview of some features of the different rational orientation relations is given in Fig. 2. Figure 2 illustrates how the different variants of the different orientation relationships would appear around one Bain variant on a {100} BCC pole figure. When the three Bain variants are shown on a pole figure, each of them is surrounded by eight KS and four NW variants, respectively. The crystallographic misorientation between two neighbouring KS variants is 10.53°, whilst the misorientation between Bain and a KS variant is 11.06°and the misorientation between Bain and a NW vari...

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Orientation relationship between austenite and bainite in a multiphased steel

Cited by 41 publications

References 8 publications

Transformation Textures in Steels: A Simulation Based on Micromechanical Modeling Data

Transformation Textures in Steels: A Simulation Based on Micromechanical Modeling Data

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

Evaluation of the Crystallographic Orientation Relationships between FCC and BCC Phases in TRIP Steels

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