Ni-Mo贝氏体球墨铸铁复合轧辊成分与性能的优化  

OPTIMIZATION ON COMPOSITION AND PROPERTIES OF BAINITE-NODULAR IRON COMPOSITE ROLLERS

作　　者：刘颖[1] 杨成召[2] 郗安民[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]济南钢铁集团总公司,济南250101

出　　处：《机械工程学报》2006年第5期214-218,共5页Journal of Mechanical Engineering

摘　　要：在对棒材精轧机常规Ni-Mo贝氏体球墨铸铁复合轧辊宏观及微观组织进行分析的基础上,找出了导致轧辊表层剥落失效的主要原因是轧辊组织中贝氏体质量分数低、碳化物形态分布不合理和石墨形态不圆整。在此基础上,通过对常规贝氏体球墨铸铁复合轧辊合金化元素质量分数的优化(镍、铜、铌复合合金化),达到优化轧辊组织与性能的目的。改良后轧辊的组织更为细小,其碳化物形态得到了显著改善;同时合金元素的复合加入显著提高了材料中贝氏体的强度,其冲击韧度、挠度、断面收缩率、断后伸长率等指标均较常规Ni-Mo球墨铸铁有明显的改善,因而能够显著延长轧辊的使用寿命,有效降低钢材的生产成本。Based on investigation on macro- and microstructures, failure mechanism of bainite-nodular iron composite rollers is revealed to be related with their low content of bainite, improper distribution of carbide and irregular graphite nodules within the material. Optimization on nickel, copper and niobium contents of the material is conducted, resulting in great improvement in microstructures as well as in mechanical properties of the rollers. After the improvement, the microstructure of the rollers becomes finer, and the morphology of the carbide phase is more regular. Also the addition of the alloying elements results in not only an increase in strength of the material, but also an improvement in roughness as well as ductility of the bainite-nodular iron. The improvement can effectively extend the lifetime of the rollers, and therefore production cost of steels can be decreased.

关 键 词：轧辊 Ni-Mo贝氏体 力学性能 

分 类 号：TP242.2[自动化与计算机技术—检测技术与自动化装置]