稀土对ICDP轧辊组织及抗热疲劳性能影响的研究

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

用稀土在熔炼后期对铁液进行变质处理,并通过金相、热疲劳试验来研究不同稀土含量对轧辊组织及其热疲劳性能的影响。试验表明,稀土含量不超过0.1%时,能有效控制轧辊基体组织中碳化物与石墨的形态、分布,进而改善轧辊的抗热疲劳性能。但稀土含量超过0.1%后轧辊基体组织中的碳化物形态与分布变化不大,石墨变得粗大,引起其抗热疲劳性能恶化。

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 struc tures and thermal fatigue performance of roils. 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 roils 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.