转速对电磁离心铸造高碳高速钢碳化物的影响  

Influence of centrifugal speed on carbide of high-carbon high speed steel prepared by electromagnetic centrifugal casting

作　　者：刘海明[1] 安永太[1] 宋绪丁[1] 张春国[1] 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064

出　　处：《材料热处理学报》2013年第8期118-123,共6页Transactions of Materials and Heat Treatment

基　　金：中央高校基金项目(CHD2013G1251033);国家自然科学基金(51054008)

摘　　要：用自制的电磁离心铸造机在磁场强度为0.10 T,离心转速分别为600、960、1370 r/min条件下制备了高碳高速钢,利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)对不同转速下制备的高碳高速钢的一次碳化物和二次碳化物进行了实验研究。结果表明,随着离心转速的提高,铸态组织块状碳化物颗粒逐渐变细小、分布变均匀,弥散;共晶组织中碳化物板条逐渐变短、变细,间距变小;热处理组织中细小的颗粒状碳化物逐渐增多,分布趋于均匀、弥散,且粒度呈现减小的趋势。High carbon high speed steel （HC-HSS） was prepared using a self-made centrifugal casting machine at the magnetic intensity 0. 1 T with various centrifugal rotational speed （600,960,1370 r/min）. The primary carbide and secondary carbide of the high carbon high speed steel （HC-HSS） prepared with various centrifugal rotational speed were analyzed by optical microscope （ OM）, scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS） analysis. The results show that with the increasing centrifugal rotational speed, the granular carbides of as-cast HC-HSS are refined and well-distributed in the steel matrix, the eutectic lath carbides become thinner and shorter, and the spacing of the lath carbides becomes smaller. After heat treatment, the amount of the thinner and smaller carbides increases, the distribution is more homogenous, and the particles of granular carbide tend to be more smaller as the centrifugal rotational speed increase.

关 键 词：离心转速 电磁离心铸造 高碳高速钢 碳化物 

分 类 号：TG249.4[金属学及工艺—铸造]