Microstructure and Mechanical Properties of High-Cr Cast Iron Bars Reinforced Hadfield Steel Matrix Composites

To obtain the compatible material of high hardness and high toughness,Hadfield steel matrix composites,reinforced by high-Cr cast iron bars made of flux-cored welding wires,which were inserted into the Hadfield steel melt,were investigated.The mechanical properties of three materials,i e,composites for as-cast and quenching-water condition,as well as Hadfield steel,were compared.The results show that the alloy powder inside flux-cored welding wires can be melted by the heat capacity of Hadfield steel melt and solidify into high-Cr cast iron bars.The impact toughness of the composite for quenching-water condition is higher than that of the composite for as-cast condition and is lower than that of the Hadfield steel,but it can still meet the requirements of hardness and toughness in industrial application.Regardless of load variation,composite for quenching-water condition shows better wear resistance than those of the composite for as-cast condition and Hadfield steel.The modified fracture toughness and wear resistance of composites are attributed to not only the combining actions of Hadfield steel matrix and high-Cr cast iron bars,but also the effect of heat treatment.

WC_P/钢基复合材料及复合轧辊的研究进展

综述了轧辊材料的发展状况以及轧辊的失效形式,重点阐述了WCP/钢基复合材料及其复合轧辊的制备工艺,指出了制备WCP/钢基复合材料工艺中存在的问题和解决办法,并在此基础上探讨了提高WCP/钢基复合轧辊质量的措施和途径。

WC_p/高锰钢基复合材料及复合结构的冲击磨损性能

采用挤压铸造法制备出WC_p/高锰钢基复合材料和复合材料-钢复合结构,研究复合材料和复合结构的冲击磨料磨损性能。在复合结构的WC预制体中及周围添加还原Fe粉,以控制复合结构中复合材料-钢的界面结构。结果表明:复合结构中复合材料-钢的界面在还原Fe粉吸热熔化的作用下,并没有出现复合材料中WC的熔解和形成过渡层的现象。复合材料磨损表面发生材料的崩落,耐磨性低于高锰钢,而复合结构耐磨性比高锰钢提高了1.34倍。通过对磨损形貌及组织的分析,讨论了复合材料崩落的原因及复合结构对冲击磨料磨损改善的机理。

中频炉熔炼高锰钢工艺控制

针对影响高锰钢质量的主要因素,通过对化学成分、晶粒度、碳化物、夹杂物和致密度的控制,优化工艺条件,实现了高锰钢铸件质量的提高。

TiC增强高锰钢基复合材料的组织与磨料磨损性能

采用凝固析出方法制备了不同体积分数TiC增强的高锰钢基复合材料,系统研究了复合材料的显微组织和磨料磨损性能。热处理后,复合材料由奥氏体和TiC两相组成,TiC颗粒均匀分布在高锰钢基体中,颗粒与基体界面清洁。磨料磨损实验表明,TiC颗粒的引入提高了复合材料耐磨性能。然而,复合材料的耐磨损性能随着TiC体积分数的增加而降低。研究结果表明,随着TiC体积分数的提高,陶瓷颗粒尺寸增大且部分形成团簇,陶瓷颗粒在磨损过程中发生破碎从而提高磨损率。