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D. A. Stewart - One of the best experts on this subject based on the ideXlab platform.
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Microstructural characterisation of Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%) alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
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microstructural characterisation of tristelle 5183 fe 21 cr 10 ni 7 5 nb 5 si 2 c in wt alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
M.j. Carrington - One of the best experts on this subject based on the ideXlab platform.
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Microstructural characterisation of Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%) alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
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microstructural characterisation of tristelle 5183 fe 21 cr 10 ni 7 5 nb 5 si 2 c in wt alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
Yahya Maghsoudlou - One of the best experts on this subject based on the ideXlab platform.
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evaluation of folic acid release from spray dried Powder Particles of pectin whey protein nano capsules
International Journal of Biological Macromolecules, 2017Co-Authors: Elham Assadpour, Seid Mahdi Jafari, Yahya MaghsoudlouAbstract:Our main goal was to evaluate release kinetics of nano-encapsulated folic acid within a double W1/O/W2 emulsion. First, W1/O nano-emulsions loaded with folic acid were prepared and re-emulsified into an aqueous phase (W2) containing single whey protein concentrate (WPC) layer or double layer complex of WPC-pectin to form W1/O/W2 emulsions. Final double emulsions were spray dried and their microstructure was analyzed in terms of scanning electron microscopy (SEM), and Fourier Transform Infrared spectroscopy (FTIR). Also the release trends of folic acid were determined and fitted with experimental models of zero and first order, Higuchi, and Hixson-Crowell. It was revealed that folic acid nano-capsules made with Span as the surfactant had the lowest release rate in acidic conditions (pH=4) and highest release in the alkaline conditions (pH=11). The best model fitting for folic acid release data was observed for single layer WPC encapsulated Powders with the highest R2. Our FTIR data showed there was no chemical interaction between WPC and pectin in double layered capsules and based on SEM results, single WPC layered capsules resulted in smooth and uniform Particles which by incorporating pectin, some wrinkles and shrinkage were found in the surface of spray dried Powder Particles.
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evaluation of folic acid release from spray dried Powder Particles of pectin whey protein nano capsules
International Journal of Biological Macromolecules, 2017Co-Authors: Elham Assadpour, Seid Mahdi Jafari, Yahya MaghsoudlouAbstract:Abstract Our main goal was to evaluate release kinetics of nano-encapsulated folic acid within a double W 1 /O/W 2 emulsion. First, W 1 /O nano-emulsions loaded with folic acid were prepared and re-emulsified into an aqueous phase (W 2 ) containing single whey protein concentrate (WPC) layer or double layer complex of WPC-pectin to form W 1 /O/W 2 emulsions. Final double emulsions were spray dried and their microstructure was analyzed in terms of scanning electron microscopy (SEM), and Fourier Transform Infrared spectroscopy (FTIR). Also the release trends of folic acid were determined and fitted with experimental models of zero and first order, Higuchi, and Hixson-Crowell. It was revealed that folic acid nano-capsules made with Span as the surfactant had the lowest release rate in acidic conditions (pH = 4) and highest release in the alkaline conditions (pH = 11). The best model fitting for folic acid release data was observed for single layer WPC encapsulated Powders with the highest R 2 . Our FTIR data showed there was no chemical interaction between WPC and pectin in double layered capsules and based on SEM results, single WPC layered capsules resulted in smooth and uniform Particles which by incorporating pectin, some wrinkles and shrinkage were found in the surface of spray dried Powder Particles.
J.l. Daure - One of the best experts on this subject based on the ideXlab platform.
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Microstructural characterisation of Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%) alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
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microstructural characterisation of tristelle 5183 fe 21 cr 10 ni 7 5 nb 5 si 2 c in wt alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
Vilma Ratia - One of the best experts on this subject based on the ideXlab platform.
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Microstructural characterisation of Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%) alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
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microstructural characterisation of tristelle 5183 fe 21 cr 10 ni 7 5 nb 5 si 2 c in wt alloy Powder produced by gas atomisation
Materials & Design, 2019Co-Authors: M.j. Carrington, J.l. Daure, Vilma Ratia, Philip H. Shipway, D G Mccartney, D. A. StewartAbstract:Abstract Nitrogen gas atomised Powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder Particles larger than approximately 53 μm are composed of dendritic fcc γ-Fe as the principal phase with smaller quantities of: α-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles 10 μm) sized Nb(C,N) Particles, that are seen in all Powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) Particles that are found within α-Fe, γ-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all Powder size ranges. The increasing quantities of α-Fe and silicide in smaller sized Powder Particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation.
