Permeable filtering fibrous materials. I. Hydraulic characteristics and their mathematical model for fibrous materials

Belous, Yu. Yu.; Косторнов, А. Г.; Efimenko, Yu. M.; Lunin, L. E.

doi:10.1007/bf00793877

Cited by 3 publications

(2 citation statements)

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“…In the past, the estimation of volume fraction of the cementite phase has been carried out by the experimental techniques such as Mössbauer spectroscopy [2][3][4][5]10,15,27] and thermomagnetic measurements [1,28]. In recent years, high-resolution characterization techniques such as field ion microscopy [7,9,12,17] and atom probe tomography (APT) [7][8][9]11,18,21] have been employed to study the phenomenon of cementite dissolution at localized length scale by measuring the concentration of carbon atoms in ferrite and cementite lamella [17][18].…”

Section: Introductionmentioning

confidence: 99%

X-ray diffraction and Mössbauer spectroscopy studies of cementite dissolution in cold-drawn pearlitic steel

Chakraborty¹,

Ghosh²,

Ranjan³

et al. 2013

Philosophical Magazine

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Cementite dissolution in cold-drawn pearlitic steel (0.8 wt.% carbon) wires has been studied by quantitative X-ray diffraction (XRD) and Mössbauer spectroscopy up to drawing strain 1.4. Quantification of cementite-phase fraction by Rietveld analysis has confirmed more than 50% dissolution of cementite phase at drawing strain 1.4. It is found that the lattice parameter of the ferrite phase determined by Rietveld refinement procedure remains nearly unchanged even after cementite dissolution. This confirms that the carbon atoms released after cementite dissolution do not dissolve in the ferrite lattice as Fe-C interstitial solid solution. Detailed analysis of broadening of XRD line profiles for the ferrite phase shows high density of dislocations ($10 15 /m 2 ) in the ferrite matrix at drawing strain 1.4. The results suggest a dominant role of h1 1 1i screw dislocations in the cementite dissolution process. Post-deformation heat treatment leads to partial annihilation of dislocations and restoration of cementite phase. Based on these experimental observations, further supplemented by TEM studies, we have suggested an alternative thermodynamic mechanism of the dissolution process.

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Section: Introductionmentioning

confidence: 99%

X-ray diffraction and Mössbauer spectroscopy studies of cementite dissolution in cold-drawn pearlitic steel

Chakraborty¹,

Ghosh²,

Ranjan³

et al. 2013

Philosophical Magazine

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“…Cementite dissolution in cold drawn pearlitic steel wires has been extensively studied in the past [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Until now, mainly two mechanisms of cementite dissolution have been proposed: (i) during wire drawing, dislocations generated near the ferrite-cementite interface cut the cementite lamella and drag the carbon atoms out of the cementite.…”

Section: Introductionmentioning

confidence: 99%

Cementite Dissolution in Cold Drawn Pearlitic Steel Wires: Role of Dislocations

Chakraborty

Maity²,

Ghosh

et al. 2013

MSF

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Despite numerous investigations in the past, mechanism of cementite dissolution has still remained a matter of debate. The present work investigates cementite dissolution during cold wire drawing of pearlitic steel (~ 0.8wt% carbon) at medium drawing strain (up to true strain 1.4) and the role of dislocations in the ferrite matrix on the dissolution process. Quantitative phase analysis using x-ray diffraction (XRD) confirms more than 50% dissolution of cementite phase at drawing strain ~ 1.4. Detail analysis of the broadening of ferrite diffraction lines confirms presence of strain anisotropy in ferrite due to high density of dislocations (~ 1015m-2) at drawing strain 1.4. The results of the analysis shows that the screw dislocations near the ferrite-cementite interface are predominantly responsible for pulling the carbon atoms out of the cementite phase leading to its dissolution.

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