摘要
在金属凝固的过程中施加脉冲电流是一种有效的细化凝固组织的方法。围绕脉冲电流细化晶粒的机制提出了多种理论。利用纯铝作为研究材料,在脉冲电流参数、浇注温度等工艺参数不变的情况下,设计了两组铸型条件不同的试验,发现不同条件下得到的铸锭凝固组织的特征有所不同。结合结晶雨机制讨论了这些特征的形成原因,指出了熔体的流动情况对脉冲电流细化效果有重大的影响。
It is an effective method to refine the solidification structure by applying pulsed current during the solidification process of metals.Many theories have been put forward to reveal the mechanism of grain refinement by the pulsed current.Taking pure aluminum as the studied material,under the condition that the process parameters such as the pulsed current parameters and pouring temperature were unchanged,two groups of experiments with different mold conditions were designed and conducted.It was found that the solidification structures of ingots changed with the mold conditions.Based on the mechanism of crystal rain,the formation process of solidification structure characteristics was discussed.Finally,it was pointed out that the melt flow had a great influence on the grain refinement by the pulsed current.
作者
杨刚
尹振兴
侯绿林
王海川
YANG Gang;YIN Zhen-xing;HOU Lu-lin;WANG Hai-chuan(College of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243000,Anhui,China)
出处
《中国冶金》
CAS
北大核心
2019年第11期45-48,共4页
China Metallurgy
基金
国家自然科学基金-钢铁联合研究基金资助项目(U1760117)
安徽高校自然科学研究重点资助项目(KJ2015A103)
关键词
脉冲电流
凝固组织
晶粒细化
凝固条件
pulsed current
solidification structure
grain refinement
solidification condition
