Microstructure formation in the powder HIPed hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%)

Carrington, M. J.; McCartney, D. G.; Shipway, P. H.; Stewart, D. A.

Abstract

Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) is an alternative material to cobalt-based alloys for wear resistant hardfacing applications. In this work, gas atomised powder was consolidated by hot isostatic pressing (HIPing) at 1120 ± 10 oC which is ∼ 100 oC below the melting onset point. The microstructure formation in the alloy, following densification, was investigated using X-ray diffraction, scanning and transmission electron microscopy and electron backscatter diffraction. The hot isostatically pressed (HIPed) alloy contains principally fcc γ-Fe, NbC, and M7C3 with a small fraction of bcc α/δ-Fe and a π-ferrosilicide phase. This contrasts with the metastable gas atomised powder microstructure in which M7C3 formation is largely suppressed and NbC precipitation is reduced. Following HIPing, a wide distribution of γ-Fe grain sizes is found. The larger grains exhibit sub-grain structures with significant intra-grain misorientations as identified by kernel average misorientation (KAM) maps. The smaller grains (< 10 μm) contain annealing twins, indicating that recrystallization had occurred only in certain localised regions which underwent sufficient plastic deformation in the early stages of HIPing. The work demonstrates the potential for HIPing hardfacing alloys to achieve a fine scale homogeneous microstructure.

Citation

Carrington, M. J., McCartney, D. G., Shipway, P. H., & Stewart, D. A. (2022). Microstructure formation in the powder HIPed hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%). Materials Characterization, 184, Article 111688. https://doi.org/10.1016/j.matchar.2021.111688

• Journal Article Type: Article
• Acceptance Date: Dec 16, 2021
• Online Publication Date: Dec 22, 2021
• Publication Date: Feb 1, 2022
• Deposit Date: Jan 5, 2022
• Publicly Available Date: Dec 23, 2022
• Journal: Materials Characterization
• Print ISSN: 1044-5803
• Electronic ISSN: 1873-4189
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 184
• Article Number: 111688
• DOI: https://doi.org/10.1016/j.matchar.2021.111688
• Keywords: Mechanical Engineering; Mechanics of Materials; Condensed Matter Physics; General Materials Science
• Public URL: https://nottingham-repository.worktribe.com/output/7166783
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S104458032100810X?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Microstructure formation in the powder HIPed hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%); Journal Title: Materials Characterization; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.matchar.2021.111688; Content Type: article; Copyright: © 2021 Elsevier Inc. All rights reserved.