Comparison between simulated and experimental transformation textures in a Nb microalloyed steel

Savoie, Jean; Ray, R.K.; Butrón-Guillén, M.P.; Jonas, John J.

doi:10.1016/0956-7151(94)90332-8

Cited by 27 publications

(21 citation statements)

References 5 publications

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“…Ferritic steels develop characteristic grain orientation distributions during thermo-mechanical processing, where a significant number of grains in the polycrystalline material present their (110) crystal planes parallel to the surface of the material [13]. Therefore, the interaction between hydrogen and Fe(110), and subsequent hydrogen adsorption on the surface constitute the first steps in the mechanism of hydrogen embrittlement in ferritic steels and, consequently, also the first opportunity in delaying or preventing the premature failure of these materials operating in hydrogen-rich environments.…”

Section: Introductionmentioning

confidence: 99%

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Chohan

Jimenez-Melero

Koehler

2016

Applied Surface Science

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We have computed adsorption energies, vibrational frequencies, surface relaxation and buckling for hydrogen adsorbed on a body-centred-cubic Fe(110) surface as a function of the degree of H coverage. This adsorption system is important in a variety of technological processes such as the hydrogen embrittlement in ferritic steels, which motivated this work, and the Haber-Bosch process. We employed spin-polarised density functional theory to optimise geometries of a six-layer Fe slab, followed by frozen mode finite displacement phonon calculations to compute Fe-H vibrational frequencies. We have found that the quasi-threefold (3f) site is the most stable adsorption site, with adsorption energies of ∼3.0 eV/H for all coverages studied. The long-bridge (lb) site, which is close in energy to the 3f site, is actually a transition state leading to the stable 3f site. The calculated harmonic vibrational frequencies collectively span from 730 to 1220 cm −1 , for a range of coverages. The increased first-to-second layer spacing in the presence of adsorbed hydrogen, and the pronounced buckling observed in the Fe surface layer, may facilitate the diffusion of hydrogen atoms into the bulk, and therefore impact the early stages of hydrogen embrittlement in steels.

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Section: Introductionmentioning

confidence: 99%

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Chohan

Jimenez-Melero

Koehler

2016

Applied Surface Science

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“…However, the explanation is only qualitative. In recent years, Savoie,17) Chapellier 18) and Ray 2) et al studied in detail the way to reproduce the transformation texture of hot-rolled steel sheets from the rolling texture of Ni-Co alloys, and it was reported that the prediction gave only about half the experimental orientation density for the major components located around {100}<011> to {211}<011>. This discrepancy was due to the lack of variant selection in the calculation.…”

Section: Transformation Texture and Orientation Relationship In Hot-rmentioning

confidence: 99%

Transformation Texture in Hot-rolled Steel Sheets and Its Quantitative Prediction

Tomida¹,

Wakita²

2012

ISIJ Int.

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Crystallographic textures of ferrite, bainite and martensite in hot-rolled steel sheets are thought to be inherited from developed textures of austenite due to the orientation relationship between austenite and the product phases. However, despite numerous investigations, there is still much difficulty in predicting such transformation textures. In this article, the present state of the prediction of transformation texture in hot-rolled steel as well as a recently proposed method that enables the quantitative prediction of the transformation texture are described. As the orientation relationship is assumed to be fulfilled not only between a nucleating ferrite particle and an adjoining austenite grain but also between the same ferrite and another adjoining austenite grain, the derived variant selection rule can provide us with a remarkable reproduction of the ferritic texture in hot-rolled steel sheets from the texture of prior austenite, and vice versa.

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“…6(a) and 6(b). These were calculated using Gauss type scattering functions [21] with a half width of 11°. As shown in Fig.…”

Section: Plane Strain Texturementioning

confidence: 99%

Effect of Internal Stresses in Cold Rolled IF Steel on the Orientations of Recrystallized Grains.

Park

Kestens²,

Jonas

2000

ISIJ International

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The residual stress remaining in deformed matrix is evaluated on the basis of the active slip systems and the dislocations necessary for flow. The orientations of the recrystallized grains that are expected to grow preferentially in the internally stressed matrix are predicted by means of a new recrystallization model. The model involves two principles: i) a strain energy release maximization theory and ii) growth by {110} plane matching. The predictions obtained in this way are compared with experimental results and discussed in terms of the possible effect of the internal stresses produced by cold rolling on the recrystallization texture.

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Comparison between simulated and experimental transformation textures in a Nb microalloyed steel

Cited by 27 publications

References 5 publications

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Transformation Texture in Hot-rolled Steel Sheets and Its Quantitative Prediction

Effect of Internal Stresses in Cold Rolled IF Steel on the Orientations of Recrystallized Grains.

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