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

Carrington, M.J.; Daure, J.; Ratia, V.L.; Shipway, P.H.; McCartney, D.G.; Stewart, D.A.

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.

Citation

Carrington, M., Daure, J., Ratia, V., Shipway, P., McCartney, D., & Stewart, D. (2019). 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 and Design, 164, Article 107548. https://doi.org/10.1016/j.matdes.2018.107548

• Journal Article Type: Article
• Acceptance Date: Dec 12, 2018
• Online Publication Date: Dec 14, 2018
• Publication Date: Feb 15, 2019
• Deposit Date: Jan 14, 2019
• Publicly Available Date: Jan 14, 2019
• Journal: Materials & Design
• Print ISSN: 0264-1275
• Electronic ISSN: 1873-4197
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 164
• Article Number: 107548
• DOI: https://doi.org/10.1016/j.matdes.2018.107548
• Keywords: Mechanical Engineering; General Materials Science; Mechanics of Materials
• Public URL: https://nottingham-repository.worktribe.com/output/1467923
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0264127518309043