TY - JOUR
T1 - 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
AU - Carrington, M.J.
AU - Daure, J.
AU - Ratia, V.L.
AU - Shipway, P.H.
AU - McCartney, D.G.
AU - Stewart, D.A.
N1 - Funding Information:
The authors gratefully acknowledge funding from Rolls-Royce plc . M.J. Carrington also acknowledges funding from the Faculty of Engineering, University of Nottingham in support of a PhD studentship. The authors thank the Nanoscale and Microscale Research Centre (nmRC) for providing access to instrumentation and Dr. Michael W. Fay for technical assistance. Access to the JEOL 7100F FEG-SEM was supported by the Engineering and Physical Sciences Research Council (EPSRC) [grant number EP/L022494/1] and the University of Nottingham. The authors also wish to thank Dr. Geoff West of the Warwick Manufacturing Group (WMG) at the University of Warwick for his technical assistance concerning TEM and TEM sample preparation.
Publisher Copyright:
© 2018 The Authors
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - 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 <53 μm have increasing quantities of either dendritic α-Fe or cellular silicide phase with decreasing amounts of γ-Fe as the particle size decreases, along with ~5% Nb(C,N). Coarse (> 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.
AB - 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 <53 μm have increasing quantities of either dendritic α-Fe or cellular silicide phase with decreasing amounts of γ-Fe as the particle size decreases, along with ~5% Nb(C,N). Coarse (> 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.
KW - Metals and alloys
KW - Coating materials
KW - Nuclear reactor materials
KW - Rapid-solidification
KW - Quenching
KW - Powder metallurgy
KW - Precipitation
UR - http://www.scopus.com/inward/record.url?scp=85059134571&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2018.107548
DO - 10.1016/j.matdes.2018.107548
M3 - Article
VL - 164
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
M1 - 107548
ER -