Perspective nickel alloys of the Ni-Cr-W-C type suitable for use at high temperatures Part I. Properties and microstructure

Nickel alloys resistant to high-temperature oxidation with carbon content o f 0.3 wt.% were studied. Very good mechanical properties at high temperatur es were achieved by adding carbon into alloys containing 25 wt.% chromium; the elevated carbon concentration brings about formation of thermally highl y stable tungsten carbides (and carbides of other high-melting metals). Att ention was centred on the effect of carbon on the structure and phase compo sition of the alloys and on the relation between their microstructure and m echanical properties. The effect of chemical composition of alloys on the m icrostructure and phase composition was described. The high-temperature mec hanical properties of the alloys were also tested. The data obtained indica te that alloys of this type are promising for use in dynamically stressed c omponents which are exposed to corrosive and abrasive environment at high t emperatures, such as components of heated parts of equipment in glass works .