机构地区: 四川大学材料科学与工程学院
出 处: 《铸造设备研究》 2003年第6期20-22,共3页
摘 要: 主要研究了水泥磨机用高铬磨球采用亚临界处理工艺时的组织转变和性能的变化,并用X衍射、扫描电镜、磁性法和硬度测定法分析了它的硬化机制。研究表明,在亚临界处理过程中,铸铁基体组织中的残余奥氏体会析出二次碳化物并在冷却过程中转变为马氏体,出现二次硬化现象,使其硬度上升。在适当的处理温度和处理时间下,该合金能得到最高的硬度,用亚临界处理的磨球能达到常规热处理的性能,这可以大大的降低生产成本。 This paper mainly studied the transformation of microstructure and change of properties of high chromium alloy (HCA) grinding balls for cement mills subjected to sub-critical treatment, and analyzed the hardening mechanism by using X-ray diffraction, SEM,magnetism method and hardness test. The results show that in the process of sub-critical treatment, the retained austenite in the matrix precipitates secondary carbide and in cooling process transforms into martensite, which causes the secondary hardening of the alloy. When the heat-treatment temperature and time is proper, the HCCI grinding balls will get the optimal hardness and properties, which is also can attained by traditional heat-treatments, and the production cast is economized.