摘要
强流脉冲电子束表面改性过程中熔化层尺寸是改性效果的衡量指标之一。针对改性中不同束流情况引发的温度场和融化层情况进行了仿真研究。通过对温度场变化等结果的分析,发现仅增加辐照次数不能有效增加熔化层尺寸。在总功率、辐照时间等不变的情况下可以对束斑的电流分布进行控制来实现熔化层控制。对束斑直径聚焦的仿真显示束斑尺寸对熔化层熔深熔宽均有较大影响,熔深随着束斑增大有减小趋势,熔宽则在一定束斑直径下有最大值。同时发现优化电子束电流分布是获得特定熔池尺寸的有效方法。
The dimension of melting zone is one of critical processing parameters in surface modification process using high current pulsed electron beam （HCPEB）. We investigated the temperature field and the melting zone by numerical simulation for different electron beam configurations. The dimension of meting zone was not enlarged by increasing the number of pulsed HCPEM. The diameter of the electron beam has a substantial effect on the melting depth and width if the process is limited to the low power and short pulse time. The melting depth decreases with increasing electron beam diameter, and there exists a proper beam size to give the maximum meting width. Optimizing the current distribution of the electron beam is an effective way to achieve required dimensions of the melting zone.
出处
《真空》
CAS
2015年第6期22-26,共5页
Vacuum
基金
国家自然科学基金:E050803
U1330110
