厚壁球墨铸铁件等温淬火处理时,难于获得均匀的贝氏体组织,如添加合金成分过多,则易引起偏析和导致析出马氏体。针对这一难点,作者开发成动了添加Ni、Mo、Cu合金元素并采用分级冷却的等温淬火新技术,使厚壁球墨铸铁件获得较均匀的贝氏体组织,并具有良好的综合机械性能。 Thick-walled ductile iron isothermal quenching, it is difficult to obtain a uniform bainite structure, such as the addition of alloy composition is too much, it is easy to cause segregation and precipitation of martensite. In response to this difficulty, the authors developed a new isothermal quenching technology that adds Ni, Mo, Cu alloying elements and uses fractional cooling to obtain a more uniform bainitic structure for thick walled nodular cast iron and has good overall mechanical properties .