Research on Influence of Rare Earth on ICDP Roll Structure and Thermal Fatigue Resistance

Liquid iron was modified by adding rare earth at later stage of melting,and metallographic and thermal fatigue tests were carried out to investigate the effects of different contents of rare earth on structures and thermal fatigue performance of rolls.The test shows that when the content of rare earth is not more than 0.1%,the morphology and distribution of carbide and graphite in the matrix structure can be effectively controlled,thereby thermal fatigue behavior of the rolls can be improved.However,when the rare earth content is more than 0.1%,there is little change in the morphology and distribution of carbide while graphite grows larger,which leads to unfavorable thermal fatigue behavior of rolls.