Microstructural evolution of a carbon modified single crystal Ni-base superalloy

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

“…1b). These results agree well with previous studies [13][14][15]26]. Further SEM observations on the deep-etched sample show that the script-like MC carbides actually adopt a dendritic structure (Fig.…”

“…It has been confirmed that morphology of MC carbides transforms from blocky to script-like and the volume fraction of γ/γ′ eutectic is reduced by carbon additions [13][14][15]. However, there are controversial opinions concerning the role of carbon during the formation of porosity.…”

Microstructural stability and mechanical properties of a boron modified Ni–Fe based superalloy for steam boiler applications

“…However, its use is controversial and the mechanism still remains unclear [11][12][13][14][15][16][17]. Nowadays the general results can be explained by supposing that adding boron increases the grain boundary strength.…”

“…Some results show that adding B can stabilize γ′ phase [11]. But Wasson et al find that γ′ coarsening rate increases after the addition of B [16]. The morphology, size, distribution and amount of the precipitated carbides have a great effect on the mechanical properties.…”