摘要
氧元素在锆基体中呈正偏析,且偏析现象明显,尤其在熔炼末期受挥发动力条件影响,氧元素的偏析现象加剧,铸锭整体均匀性的控制难度增大。本试验对采用小电流多级补缩制度的大规格锆合金铸锭冒口区域解剖后分析氧含量,研究熔炼末期铸锭冒口中氧元素的分布规律。经分析认为,选用多级降电流、短时间保持的补缩工艺以及补缩末期充氩熔炼的方式可改善铸锭头部中心氧元素的偏析程度。
The distribution of oxygen generates obvious serious positive segregation in zirconium base material.Especially, the segregating becomes more serious due to the kinetic impact from evaporation at the end of melting, which can cause more difficulties on the control of ingot uniformity. The experiment cut off the riser part from the large size zirconium alloy ingot by using low current and multistage hot topping process in order to analyze oxygen content. Then, the distribution of oxygen element in the riser in the end of smelting was researched. The oxygen segregation degree in the center of ingot top improves by using the hot topping process of multistage reducing current and short-time holding, as well as the argon backfilling in the end of hot topping.
出处
《热加工工艺》
CSCD
北大核心
2016年第11期114-116,共3页
Hot Working Technology
关键词
锆合金铸锭
冒口
偏析
氧元素
zirconium alloy ingot
riser
segregation
oxygen element
