采用真空自耗电弧熔炼和真空非自耗电弧熔炼2种工艺熔炼了4种不同成分的多元铌基超高温合金,研究了合金成分及熔炼工艺对组织的影响规律.结果表明:4种成分的合金均由初生Nb基固溶体枝晶或初生(Nb,x)5Si3(x代表Ti, Cr和Hf元素)块和板条以及Nbss/(Nb,x)5Si3共晶团组成.随着Si含量的升高,组织中Nbss/(Nb,x)5Si3共晶团的含量增多且初生相也从Nbss枝晶转变为(Nb,x)5Si3块或板条.铌硅化物相为γ-(Nb,x)5Si3及β-(Nb,x)5Si3.大块或板条状硅化物内有微裂纹出现.
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