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Unnikrishnan, Rahul; Carruthers, Alexander; Cao, Sheng; Rogers, Samuel R; Kwok, Thomas WJ; Thomas, Rhys; Dye, David; Bowden, David; Francis, John A.; Preuss, Michael; Pickering, Ed
Materialia, June 2024, 2024-06-00, Letnik: 35Journal Article
•Two π-ferrosilicide containing carbon-free iron-based alloys with high hardness were developed.•The presence of ordered D03 precipitates in the ferrite matrix along with the orientation relationship between π-ferrosilicide and ferrite matrix provides promising wear properties in these alloys.•The dissolution of π-ferrosilicide at high temperatures enables easy thermomechanical processing of the alloys. Recently, iron-based alloys with a π-ferrosilicide phase have emerged as potential alternatives to cobalt-based hardfacing alloys. Here, we present the development of two π-ferrosilicide containing alloys: one with a ferritic matrix and the other with a ferritic-austenitic matrix. In the as-cast condition, both alloys revealed fine Ni- and Si-rich coherent cubic shaped D03 precipitates in the BCC matrix. The π-ferrosilicide phase was found to have an orientation relationship with the ferrite phase, nucleating within ferrite matrix and from ferrite grain boundaries. In contrast to carbide-strengthened hardfacing Fe-alloys, here the dissolution of the π-ferrosilicide phase at 1200 °C enables easy thermomechanical processing of these alloys, which results in refinement of the π-ferrosilicide and additional formation of χ-phase precipitates in the ferrite. Nano-scratch tests provided evidence of a resilient silicide-ferrite interface, likely to due to it possessing some coherency. Both alloys also displayed compressive strengths approaching 2 GPa and ductility in compression of approximately 25 %. The combination of processability and attractive mechanical properties suggests that these alloys have the potential to serve as alternatives to carbide-reinforced hardfacing Fe-alloys. Display omitted
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