应用Gleeble 150 0热模拟试验机测定 15%Cr白口铸铁的CCT曲线 ,研究了微量稀土对高铬白口铸铁组织转变的影响。结果表明 ,稀土能增加过冷奥氏体的稳定性 ,使CCT曲线右移 ,并使铸态先共晶奥氏体由树枝晶变为近等轴晶 ,使长条状共晶碳化物变为均匀的团块状 The CCT curves of 15% Cr white cast iron were measured by Gleeble 150 0 thermal simulation test machine. The effect of trace rare earth on the microstructure transformation of high chromium white cast iron was studied. The results show that the rare earth can increase the stability of the supercooled austenite and make the CCT curve move to the right, and the as-cast austenite changes from dendrite to near-equiaxed grain. For a uniform mass