双辊铸轧高速钢薄带的晶粒细化  

Grain refinement of high-speed steel on twin-roll strip casting

作　　者：朱万军[1] 

机构地区：[1]辽宁科技学院冶金系,辽宁本溪117022

出　　处：《鞍山科技大学学报》2005年第3期216-219,共4页Journal of Anshan University of Science and Technology

摘　　要：主要介绍了W9Mo3Cr4V高速钢在双辊铸轧过程中的晶粒细化。薄带钢在铸轧过程中的冷却时间仅为0 2-0 3s,冷却速度很快,冷却速度已达到100-1000℃/s,因此,在快速凝固的过程中,液体金属获得了较大的过冷度,晶核的临界半径随过冷度的增加而减小,晶粒必然细化。另外,过冷度增大,晶核形核功减小,形核几率增大,也使晶粒细化。The grain refinment of W_9Mo_3Cr_4V high-speed steel during the course of the twin-roll casting was discussed.The time of strips casting is only 0.2-0.3 s,while the speed of cooling amounts to 100-(1 000) ℃/s.So,the liquid metals have a great supercooling degree during the course of the fast solidification.The critical radius of crystal nucleus diminishes with the increasing of supper cooling degree.So that the grain must be refined.In addition,the reducing of crystal nucleus nucleating energy and increasing of nucleating rate with accretion of degree of supercooling,also refine the grain.

关 键 词：双辊铸轧 高速钢 过冷度 晶粒细化 

分 类 号：TG337[金属学及工艺—金属压力加工] TG136.1[一般工业技术—材料科学与工程]