摘要
采用膨胀法,辅以金相法、硬度法测定了2种成分试验贝氏体钢轨钢的连续冷却转变曲线,对不同冷速下获得的金相组织进行观测,同时分析讨论了成分的选择及合金元素的作用。试验表明,1号钢冷却速度在0.3～2℃/s范围内,2号钢冷却速度在0.3～3℃/s范围内,贝氏体钢中得到以贝氏体为主的组织;1号钢、2号钢最佳冷速范围均为0.8～1.5℃/s;当冷速大于4℃/s时,两组钢将得到以板条马氏体为主的组织。
The CCT curves of two different chemical component bainitic rail steels are determined through the expansion method and auxiliary metallograph and hardness examinations. The microstructures at different cooling rates are observed and the selection of components and effect of alloy elements are analysed. The micro-structure mainly consisting of bainite is obtained when the cooling rate ranges between 0.3°C/s and 2°C/s for Steel No. 1 and between 0.3°C/s and 3°C/s for Steel No. 2. The optimum cooling rate of the two types of steels lies between 0.8°C/s and 1.5°C/s. The lath martensite is obtained in when the cooling rate goes beyond 4°C/ s.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2005年第3期35-39,共5页
Journal of the China Railway Society
