Determination of Type and Degree of Long-Range Order in FeSi Steel by the Mössbauer Effect

Bogachev, I. N.; Karakishev, S. D.; Litvinov, V. S.; Ovchinnikov, V. V.

doi:10.1002/pssa.2210240235

Cited by 16 publications

(6 citation statements)

References 4 publications

(1 reference statement)

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“…Nevertheless, a model considering a partial substitution of the atoms following the FelSSi and D0 3 structures agrees well with the experimental results. This confirms former Mossbauer and neutron diffraction works [7][8][9][10]12]. In addition, from these calculations the long range order parameters for both structures have been obtained and results show that increasing Si-content leads to higher degrees of order, and especially in the case of the D0 3 order parameter.…”

Section: Discussionsupporting

confidence: 88%

“…On the other hand, Mossbauer spectroscopy has revealed the presence of the Fel5Si phase around 3.0 wt. % Si [12] and the possible appearance of the Fe7Si phase [13]. This means that the phase diagram of Fe-Si alloys in this concentration range is still under discussion and different results are found in the literature about the type and degree of order present in these alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The lack of correlation between experimental values and the usual ordering models prove that the atomic arrangements in Fe-Si alloys in this concentration range are more complicated than these simple situations which just consider complete order or complete disorder. Moreover, also other structures like FelsSi or Fe7Si should be taken into account [11,12]. Figure 3 summarizes the unit cells of all the mentioned structures.…”

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confidence: 99%

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On the Influence of Order on the Soft Magnetic Properties of Fe-Si Alloys

Ruiz

Ros‐Yéñez

Vandenberghe

et al. 2005

steel research international

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Five high-Si steels (1.9, 3.3, 4.2, 5 and 5.6 wl.% Si) were processed by conventional hot and cold rolling. Using a proper thermomechanical schedule, it was possible to produce final sheets with a thickness of 0.5-0.7 mm. For two of the steels with 4.2 and 5.6 wI. % Si different cooling rates after hot rolling were applied in order to study the influence of ordering phenomena on the workability of the material. Mossbauer spectroscopy was used to characterize the degree of order of the steels along their thermomechanical processing. Long-range order parameters were directly obtained from the Mossbauer spectra analysis. Results show that 00 3 order enhancement causes deterioration of the ductility above 3.5 wl.%Si. In addition, the limitation of order enhancement during cooling seems to be the reason for the improved workability in the fast cooled samples: the slower the cooling, the higher the degree of order, with a consequent decrease in ductility. Power losses and magnetic polarization were measured after cold rolling and annealing. An influence of order on the magnetic properties is discussed: order enhancement seems to cause a detriment to the power losses.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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On the Influence of Order on the Soft Magnetic Properties of Fe-Si Alloys

Ruiz

Ros‐Yéñez

Vandenberghe

et al. 2005

steel research international

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“…It is known that up to 10 at.% silicon content in the α-FeSi phase, Si atoms will go into each atomic site with equal probability. If the silicon content is higher than 10 at.%, the ordered DO 3 structure will appear [41,42]. In Fe-25 at.% Si alloy, 1/3 of Fe atoms have eight iron atoms as the nearest neighbours (nn), and 2/3 of Fe atoms have four Si nn atoms and four Fe nn atoms.…”

Section: Discussionmentioning

confidence: 99%

The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

Zbroszczyk¹,

Ciurzyńska²

1997

J. Phys.: Condens. Matter

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The magnetic relaxation phenomenon for the Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 alloy in the asquenched state and after annealing is investigated. It is stated that the disaccommodation intensity distinctly decreases after the heat treatment of the sample at 673 K for 1 h due to the annealing out of some free volumes. Moreover, the intensity of the disaccommodation drops almost to zero after the sample crystallization occurs. From the results obtained, it becomes evident that the amorphous phase is the main source of the magnetic after-effect in the nanocrystalline samples. The present results are discussed under the assumption that the relaxation processes are described by a gaussian distribution in ln τ .

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“…Such a lack of ductility has been attributed to structural ordering into at least two phases known as B2 (FeSi) and DO 3 (Fe 3 Si), although studies using 57 Fe Mo ¨ssbauer spectroscopy indicate that structures such as Fe 15 Si and Fe 7 Si occur in iron-silicon alloys. 4,5 In spite of the limited low temperature ductility of the high silicon alloys, attributable in great part to the retention of order and therefore to the difficulty of dislocation movement, ordered materials appear to be deformable. 6,7 The aim of the present work is to present the results obtained while studying the plastic behaviour of an iron-silicon alloy deformed in plane strain compression at room temperature, because this mode of deformation can simulate the conditions encountered during cold rolling.…”

Section: Introductionmentioning

confidence: 99%

Plane strain compression of high silicon steel

Calvillo¹,

Ros-Yanez²,

Ruiz³

et al. 2006

Materials Science and Technology

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A series of plane strain compression tests were conducted at room temperature on a high silicon steel to study the behaviour of this material owing to the similarity of this test with rolling. The tests were performed in a specially designed machine able to control the strain rate profile and the amount of deformation. The material was cast and hot rolled to a thickness of 4 mm from which the experimental samples were machined. Plane strain compression tests were carried out at three constant rates of strain (0 . 01, 0 . 1 and 1 s 21 ) up to four levels of equivalent strain (0 . 15, 0 . 30, 0 . 45 and 0 . 60). 57 Fe Mö ssbauer spectroscopy analyses indicate that the degree of order of the material decreases with the amount of deformation until a strain of 0 . 45 is achieved; a further increase in strain augments the order of the material. It is found that the strain rate sensitivity close to yielding is negative, but converts to positive once a stain of y0 . 04 is surpassed. Microstructural analyses of deformed samples show that deformation is by twinning and shear. Electron backscattered diffraction analyses indicate that twinning occurs only at an early stage of deformation within grains with {111} planes parallel to the plane of deformation. Deformation twinning takes place in all grains at later stages of deformation.

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Determination of Type and Degree of Long-Range Order in FeSi Steel by the Mössbauer Effect

Cited by 16 publications

References 4 publications

On the Influence of Order on the Soft Magnetic Properties of Fe-Si Alloys

On the Influence of Order on the Soft Magnetic Properties of Fe-Si Alloys

The magnetic after-effect in amorphous and nanocrystalline Fe - Cu - Nb - Si - B alloys

Plane strain compression of high silicon steel

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