分级淬火中硅诱发贝氏体相变的研究  

Study on Silicon Induced Phase Transformation in Bainite Ductile Iron by Monified Step Quenching

作　　者：徐杨[1] 关耀辉[1] 黄亚葵[1] 周世康[1] 

机构地区：[1]中国农业大学工学院,北京100083

出　　处：《材料热处理学报》2005年第5期117-120,共4页Transactions of Materials and Heat Treatment

摘　　要：采用新型分级淬火工艺生产高硅贝氏体球铁,将试样奥氏体化后,入常温介质中分级淬火,使球铁在230℃箱式电炉中等温转变成贝氏体组织,与传统的盐浴等温淬火贝氏体球铁进行比较.利用SEM、硬度计、冲击试验机等分析测试技术,对材料的微观组织和力学性能进行了研究.结果表明:采用分级淬火工艺生产高硅贝氏体球铁时,在Si含量大于3.3wt%时,对贝氏体相变具有显著的诱发作用,从而使贝氏体球铁组织细化,力学性能提高(52～56HRC、αk达12～15J/cm2),并对此进行了理论分析.A low bainite ductile iron with different Si content was used to study silicon induced bainitic transformation by a modified step quenching process.The microstructures and mechanical properties were examined by means of SEM,hardness and impact tests.The mechanism of effect of silicon content on bainitic phase transformation was discussed.The results show that silicon content higher than 3.3 wt% can induce distinctly phase transformation of low bainite in the process of modified step quenching(isothermal temperature 230℃).The microstructure is fined and mechanical properties are improved for the bainite ductile iron treated by the modified step quenching.

关 键 词：分级淬火 硅 贝氏体球铁 诱发相变 

分 类 号：TG154.2[金属学及工艺—热处理]