A high-strength silicide phase in a stainless steel alloy designed for wear-resistant applications

D. Bowden, Y. Krysiak, L. Palatinus, D. Tsivoulas, S. Plana-Ruiz, E. Sarakinou, U. Kolb, D. Stewart and M. Preuss ()
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D. Bowden: The University of Manchester
Y. Krysiak: Johannes Gutenberg University Mainz
L. Palatinus: Institute of Physics
D. Tsivoulas: The University of Manchester
S. Plana-Ruiz: Johannes Gutenberg University Mainz
E. Sarakinou: The University of Manchester
U. Kolb: Johannes Gutenberg University Mainz
D. Stewart: Rolls-Royce plc
M. Preuss: The University of Manchester

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Hardfacing alloys provide strong, wear-resistant and corrosion-resistant coatings for extreme environments such as those within nuclear reactors. Here, we report an ultra-high-strength Fe–Cr–Ni silicide phase, named π-ferrosilicide, within a hardfacing Fe-based alloy. Electron diffraction tomography has allowed the determination of the atomic structure of this phase. Nanohardness testing indicates that the π-ferrosilicide phase is up to 2.5 times harder than the surrounding austenite and ferrite phases. The compressive strength of the π-ferrosilicide phase is exceptionally high and does not yield despite loading in excess of 1.6 GPa. Such a high-strength silicide phase could not only provide a new type of strong, wear-resistant and corrosion-resistant Fe-based coating, replacing more costly and hazardous Co-based alloys for nuclear applications, but also lead to the development of a new class of high-performance silicide-strengthened stainless steels, no longer reliant on carbon for strengthening.

Date: 2018
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DOI: 10.1038/s41467-018-03875-9

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