The effects of the minor alloying elements Al, Si and Mn on the cyclic oxidation of Ni–Cr–W–Mo alloys

Thermal–mechanical fatigue behaviour of a new single crystal superalloy: Effects of Si and Re alloying

“…The addition of Si to Ni-alloys has proven to be beneficial for oxidation properties due to formation of a protective chromia layer and that the Si-addition prevents the formation of transient oxides [23]. For STAL-15, previous studies have shown that the addition of Si improves oxidation properties [24,25].…”

In-Service Oxidation and Microstructural Evolution of a Nickel Superalloy in a Formula 1 Car Exhaust

“…5b confirm that silicon oxides are indeed forming, even if only at levels detectable using sub-nm resolution. All of these scales are more protective than the transient oxides that would otherwise form [39], underlining the benefits to oxidation resistance [36][37][38] and the need for further dedicated studies on the effect of Si content.…”

“…However, Mo 5 Si 3 is a known thermodynamically stable species (DG f = -319 kJ/mol at 1273°C [34]), and the formation of (Nb, Mo) 5 Si 3 silicides has been observed in high Si-content Nb-based alloys [35]. Prior studies have examined the effects of Si addition on superalloy properties [36,37], but the partitioning behaviour of Si to c or c 0 phases appears to change with different alloying additions (such as Ti). Whilst the addition of Si is known to improve oxidation resistance [33,37] and mechanical properties such as thermal-mechanical fatigue [38] in single-crystal alloys, Si segregates to grain boundaries and has been known to trigger the formation of topologically closepacked (TCP) phases in polycrystalline alloys [38].…”

“…Prior studies have examined the effects of Si addition on superalloy properties [36,37], but the partitioning behaviour of Si to c or c 0 phases appears to change with different alloying additions (such as Ti). Whilst the addition of Si is known to improve oxidation resistance [33,37] and mechanical properties such as thermal-mechanical fatigue [38] in single-crystal alloys, Si segregates to grain boundaries and has been known to trigger the formation of topologically closepacked (TCP) phases in polycrystalline alloys [38]. Floreen et al [21] An additional fate for Si is to migrate towards the oxide-metal interface, as shown in the EPMA maps (Figs.…”

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

“…It was found that the minor alloying elements such as Mo, present in the coatings can support the formation of protective chromia [49], [50]. Zahs et al studied [40] the chlorine-induced high temperature corrosion of a wide range of alloys with focus on the behaviour of the alloying elements between 400-700 °C.…”