在CE为4.4%～4.5%的高导热铸铁制动盘中加入不同量的铌合金,研究了Nb对其组织和力学性能的影响.结果表明,CE为4.4%、w(Nb)量为0.09%时,高导热铸铁制动盘石墨组织细化,力学性能得到一定的提高,磨损量降低,制动盘的抗热裂性提高.%Different amount of niobium alloy was added into the high thermal conductivity cast iron with CE of 4.4％～4.5％ used for brake disc,and the effect of the niohium on the microstructure and mechanical properties of the casting were investigated. The result showed that,when CE was of 4.4％,Nb was of 0.09％ .the graphite of the high thermal conductivity cast iron brake disc became finer,its mechanical properties were increased in some degree,its wear loss was reduced,its hot cracking resistance was improved.
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