Influence of the parent phase on the bainitic transformation under large stress of manganese-boron steel 22MnB5

Schicchi, Diego Said; Hunkel, M.

doi:10.1016/j.matchar.2019.01.025

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…Approximately 10,000 bainitic ferrite grains were detected. From the determined EBSD-data of bainite, the prior-austenite grains (PAGs) were reconstructed using the algorithm by Nyssönen [ 42 , 43 ] and the Kurdjumov-Sachs orientation relationship. The reconstructed PAGs are shown in Figure 5 , and the mean PAG size is about 50 μm.…”

Section: Resultsmentioning

confidence: 99%

Modeling Bainitic Transformations during Press Hardening

et al. 2021

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We revisit recent findings on experimental and modeling investigations of bainitic transformations under the influence of external stresses and pre-strain during the press hardening process. Experimentally, the transformation kinetics in 22MnB5 under various tensile stresses are studied both on the macroscopic and microstructural level. In the bainitic microstructure, the variant selection effect is analyzed with an optimized prior-austenite grain reconstruction technique. The resulting observations are expressed phenomenologically using a autocatalytic transformation model, which serves for further scale bridging descriptions of the underlying thermo-chemo-mechanical coupling processes during the bainitic transformation. Using analyses of orientation relationships, thermodynamically consistent and nondiagonal phase field models are developed, which are supported by ab initio generated mechanical parameters. Applications are related to the microstructure evolution on the sheaf, subunit, precipitate and grain boundary level.

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Section: Resultsmentioning

confidence: 99%

Modeling Bainitic Transformations during Press Hardening

et al. 2021

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“…If a region contains at least two α variants transformed from a single γ grain, the parent γ orientation (M γ ) and the OR (V γ→α ) can be simultaneously obtained through numerical fitting [9]. Firstly, the possible orientations of α variants can be calculated as [13]:…”

Section: Precise Solution Of the Ormentioning

confidence: 99%

An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

Wang

Jin

et al. 2019

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The microstructure of austenite at high temperatures, which cannot be reserved at room temperatures, determines the properties of its transformed phase in low-alloy steels. Consequently, an accurate method is herein developed to reconstruct local orientations of the parent austenite (γ) phase from electron backscatter diffraction maps of the martensite (α ) microstructure. The orientation map of α is cropped into a grid of data squares as the reconstruction unit. The cropped square is then divided into the square inherited from only one γ grain and the square inherited from more than one γ grain. The local orientations around parent γ grain boundaries are more accurately determined using a newly proposed reconstruction criterion. Furthermore, the solution spaces for the orientation relationship and the parent γ orientation are refined, which simultaneously improves the calculation accuracy and efficiency of reconstruction procedure. The validated reconstruction method is applied to obtain local orientations of the deformed γ microstructure accurately.

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