[ New Material Developments ]
[ New Material Developments ]
its sluggish kinetics to oxidation as compared to iron and chromium . Therefore , nickel does usually not participate in the native passive film of stainless steel , not even in nickel superalloys . However , remarkably , nickel contributes to the surface oxide and thereby improves the surface nobility of Hybrid Steel . Particular emphasis on the contribution to passivity must be given to aluminum . It provides continuous support to the mixed-type surface oxide , explaining the passive nature of the steel . Our work indicates that the synergy between the mixed oxides provides exceptional passive behavior .
A new potential for designing sustainable stainless steel ? Hybrid Steel has not been developed for use in acidic environments . We conducted this test program to characterize and understand the passive layer nature of Hybrid Steel . The conclusion is that it offers exceptional corrosion resistance that allows a comparison to low-alloyed stainless steel . Sustainable materials must be corrosion-resistant at affordable costs . Whether or not Hybrid Steel can be declared as a stainless steel or possibly a corrosion-resistant steel , tomorrow ’ s stainless steel will be manufactured with precise alloying of elements contributing to passivity . Regarding the corrosion-resistance-to-cost ratio , the suggestion is that a mixed noble oxide with a similar metal cation fraction may outperform a passive with chromium oxide only . Ultimately , the work suggests that steel can be made stainless-like with a diligent alloying recipe without requiring the conventional Cr threshold concentration of 10.5 %.
About the authors
Dr Steve Ooi is Group Technical Specialist with Ovako , based at Cambridge University . His work specializes in alloy and process design in the context of steels for complex engineering applications where component failure can lead to major consequences . Much of his research has therefore been focused on critical components in aeroengines , automobiles , stress-cancelling welding alloys , deep-ocean structures and bearings .
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Dr . Cem Örnek is head of the Surface Technology Department at the Leibniz Institute for Materials Engineering , and concurrently holds a position as an adjunct professor in the Department of Metallurgical and Materials Engineering at Istanbul Technical University . His research is dedicated to the comprehensive understanding of material degradation phenomena , encompassing areas such as corrosion and wear .
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Reference
“ Understanding the passive behaviour of low-chromium high-strength Hybrid steel in corrosive environments ”: https :// www . nature . com / articles / s41529-023-00392-z
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