振动条件下的晶粒弥散细化效应及其能量判据

• 作 者: 张莹 王猛 林鑫 黄卫东
• 机 构: 西北工业大学凝固技术国家重点实验室,
• 出 处: 铸造技术
• 发表日期: 2011年12期
• 关键词: 振动 NH4Cl -H2O 晶粒剥离 晶粒细化

采用透明模型合金NH4Cl-70%H2O考察不同振动条件下激冷表面的激发形核特性及晶粒剥离行为。实验结果表明:振动频率f一定时,晶粒的剥离速度与细化程度随振动加速度a的增加而增加。基于能量的定义用来描述实验中振动参数和能量之间的关系,实验发现晶粒的细化效果存在能量准则,并给出细化晶粒的优化参数和判据为a2/f≥200m2/s3。

The excited nucleation characteristics and grain delamination behavior of chilled surfaces under different vibration conditions were investigated by using transparent model alloy NH4Cl-70% H2O. The experimental results show that when the vibration frequency f is constant, the peel speed and the degree of grain refinement increase with the increase of vibration acceleration a. The definition based on energy is used to describe the relationship between vibration parameters and energy in the experiment. The experimental results show that there are energy criteria for the refinement of grains and the optimized parameters and criteria of grain refinement are a2 / f≥200m2 / s3.