摘要
采用斜坡预结晶法制备了M2高速钢半固态坯料,研究了斜坡长度对坯料显微组织的影响,采用Image Tool软件进行定量分析,探讨了其非枝晶半固态组织的成形机制。结果表明:在浇注温度和斜坡角度一定时,斜坡长度对坯料显微组织有显著的影响。合金液在斜坡表面上流动将经过三个阶段:降温阶段、大量形核和球化阶段、形成凝固壳阶段。
M2 high speed steel ingots were prepared by inclined slope pre-crystallization method. Effect of inclined slope length on the microstructure of M2 HSS ingots was investigated, and the microstructure was quantitatively assessed by image tool software. The formation mechanism of non-dendritic semi-solid structure was discussed. It was found that the slope length had great influence on microstructure of the ingots at a certain casting temperature and slope angle. The molten alloy flowed through three stages along the plate surface ： cooling, nucleating and globurizing, and forming solidified shell.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2009年第4期538-542,共5页
Chinese Journal of Rare Metals
基金
北京交通大学"十五"重大科研基金资助项目(230-12)
关键词
斜坡预结晶
非枝晶
半固态
形成机制
inclined slope pre-crystallization
non-dendritic crystal
semi-solid
forming mechanism
