Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence
Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or a...
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| Autor*in: |
Kublii, V. Z. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2004 |
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| Anmerkung: |
© Springer Science+Business Media, Inc. 2004 |
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| Übergeordnetes Werk: |
Enthalten in: Powder metallurgy and metal ceramics - Kluwer Academic Publishers-Consultants Bureau, 1993, 43(2004), 11-12 vom: Nov., Seite 630-644 |
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| Übergeordnetes Werk: |
volume:43 ; year:2004 ; number:11-12 ; month:11 ; pages:630-644 |
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| DOI / URN: |
10.1007/s11106-005-0032-3 |
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OLC206114778X |
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| 520 | |a Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. | ||
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10.1007/s11106-005-0032-3 doi (DE-627)OLC206114778X (DE-He213)s11106-005-0032-3-p DE-627 ger DE-627 rakwb eng 670 VZ Kublii, V. Z. verfasserin aut Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence 2004 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2004 Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. carbide phase modification structure ordering Velikanova, T. Ya. aut Enthalten in Powder metallurgy and metal ceramics Kluwer Academic Publishers-Consultants Bureau, 1993 43(2004), 11-12 vom: Nov., Seite 630-644 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:43 year:2004 number:11-12 month:11 pages:630-644 https://doi.org/10.1007/s11106-005-0032-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 GBV_ILN_2014 AR 43 2004 11-12 11 630-644 |
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10.1007/s11106-005-0032-3 doi (DE-627)OLC206114778X (DE-He213)s11106-005-0032-3-p DE-627 ger DE-627 rakwb eng 670 VZ Kublii, V. Z. verfasserin aut Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence 2004 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2004 Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. carbide phase modification structure ordering Velikanova, T. Ya. aut Enthalten in Powder metallurgy and metal ceramics Kluwer Academic Publishers-Consultants Bureau, 1993 43(2004), 11-12 vom: Nov., Seite 630-644 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:43 year:2004 number:11-12 month:11 pages:630-644 https://doi.org/10.1007/s11106-005-0032-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 GBV_ILN_2014 AR 43 2004 11-12 11 630-644 |
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10.1007/s11106-005-0032-3 doi (DE-627)OLC206114778X (DE-He213)s11106-005-0032-3-p DE-627 ger DE-627 rakwb eng 670 VZ Kublii, V. Z. verfasserin aut Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence 2004 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2004 Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. carbide phase modification structure ordering Velikanova, T. Ya. aut Enthalten in Powder metallurgy and metal ceramics Kluwer Academic Publishers-Consultants Bureau, 1993 43(2004), 11-12 vom: Nov., Seite 630-644 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:43 year:2004 number:11-12 month:11 pages:630-644 https://doi.org/10.1007/s11106-005-0032-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 GBV_ILN_2014 AR 43 2004 11-12 11 630-644 |
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10.1007/s11106-005-0032-3 doi (DE-627)OLC206114778X (DE-He213)s11106-005-0032-3-p DE-627 ger DE-627 rakwb eng 670 VZ Kublii, V. Z. verfasserin aut Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence 2004 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2004 Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. carbide phase modification structure ordering Velikanova, T. Ya. aut Enthalten in Powder metallurgy and metal ceramics Kluwer Academic Publishers-Consultants Bureau, 1993 43(2004), 11-12 vom: Nov., Seite 630-644 (DE-627)171221524 (DE-600)1167195-6 (DE-576)038719614 1068-1302 nnns volume:43 year:2004 number:11-12 month:11 pages:630-644 https://doi.org/10.1007/s11106-005-0032-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_32 GBV_ILN_70 GBV_ILN_2014 AR 43 2004 11-12 11 630-644 |
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Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence |
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Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. © Springer Science+Business Media, Inc. 2004 |
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Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. © Springer Science+Business Media, Inc. 2004 |
| abstract_unstemmed |
Abstract We have studied alloys in the W - C system with compositions 24 to 48 at.% C, melted in an arc furnace, homogenized and quenched from temperatures of 1450°C to 2650°C or cooled stepwise from a subsolidus temperature down to 850°C, and annealed for a prolonged period at this temperature or at temperatures close to it. We studied the specimens by x-ray single-crystal and powder diffraction, metallography, and differential thermal analysis. We have shown that the carbide $ W_{2} $C exists in two modifications: an hexagonal phase with structure of type L′3 crystallizes from the melt, which at T ≈ 1850°C transforms to an ordered hexagonal phase of the ε-$ Fe_{2} $N type. The latter, for a carbon content of about 32 at.% and T ≈ 1250°C, also decomposes according to a eutectoid reaction to 〈W〉 and WC. This decomposition is accompanied by formation of a metastable phase of the ξ-$ Fe_{2} $N type as an intermediate. Taking the results obtained and literature data into consideration, we have corrected the phase diagram for the W - C system. © Springer Science+Business Media, Inc. 2004 |
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Ordering in the carbide $ W_{2} $C and phase equilibria in the tungsten — carbon system in the region of its existence |
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https://doi.org/10.1007/s11106-005-0032-3 |
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Velikanova, T. Ya |
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