原位纳米高强韧贝氏体钢轨的组织  

Microstructure of in-situ nano bainitic rail with high strength and toughness

作　　者：石素锦 余万华[1] 王亚东 王自东[1] SHI Su-jin;YU Wan-hua;WANG Ya-dong;W ANG Zi-dong(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2019年第3期94-101,共8页Transactions of Materials and Heat Treatment

摘　　要：采用真空熔炼+离心铸造和真空熔炼+普通铸造的方法制备了两组贝氏体钢,随后对两组钢进行了相同的轧制和热处理工艺,采用光学显微镜、扫描电镜和透射电镜等观察分析了两组试验钢的显微组织。结果表明:相比于普通铸造方法,通过离心铸造方法获得的试验钢的组织中有均匀细小的原位纳米析出相且基本消除了钢在铸造过程中的偏析现象;经不同的退火工艺处理后,试验钢获得了粒状贝氏体和板条状无碳化物贝氏体。Two groups of bainitic steel were prepared by vacuum smelting plus centrifugal casting and vacuum smelting plus conventional casting, then the same rolling and heat treatment processes were carried out for the two groups of steels. Microstructure of the two groups of steels was observed and analyzed by means of optical microscope, scanning electron microscopy and transmission electron microscopy. The results show that compared with the conventional casting method, the microstructure of the steel obtained by centrifugal casting has uniform and fine in-situ nano-precipitated phase, and the segregation phenomenon in the casting process is basically eliminated. After different annealing processes, granular bainite and lath-like carbide-free bainite of the steel are obtained.

关 键 词：原位纳米 贝氏体钢轨 组织 

分 类 号：TG142.2[一般工业技术—材料科学与工程]