摘要
半连续铸造铝合金过程中,采用同时施加与铸锭对称轴方向平行的稳恒磁场和交变磁场,促使熔体产生受迫振荡的方法,一方面通过减小不可补缩区间,降低内应力或应变,使金属高温脆性区主要处于受压状态等方式,减少了热裂纹形成的外部诱因;另一方面,通过缩小合金材料高温脆性区,提高固液状态伸长率,减少晶界低熔点化合物数量和有效结晶区间线收缩大小等途径,降低了合金铸锭的热裂倾向性,从而达到了消除铸造裂纹的目的。
In the process of continuously cast ingot of aluminum alloy,the forced vibration of molten melt is produced by the simultaneous application of a stationary magnetic field and a variable magnetic field.On the one hand,reduce the external factors for initiating hot cracking through improving the as-cast condition to decrease the size of unfeeding zone,to reduce the thermal stress and strain,to make allo-ying brittleness zone mainly in the state of being compressed.on the other hand,decrease the hot cracking tendency of alloys by the method of reducing the size of alloying brittleness zone,increasing the extensibility of solid/liquid phase,decreasing the quantities of eutectic compounds with low melting point and the linear contraction of effective solidifying zone.As the results of the two facts,the cracking of as-cast ingot was eliminated.
出处
《铸造》
CAS
CSCD
北大核心
2005年第1期36-39,共4页
Foundry
基金
国家重大基础发展规划项目("973"项目编号:G199906490501)。
关键词
电磁振荡
铝合金
半连铸
热裂纹
electromagnetic vibration
aluminum alloy
semi-continuous casting
hot cracking
