摘要
采用正交实验方法对HRB335钢进行电脉冲处理.考虑了最大脉冲电流、频率和处理时间的搭配作用,得出实验条件下的最佳参数范围.通过和前人结果的分析比较得出电脉冲效果可能与钢种无关的初步结论,以及对树枝晶打断理论的不同观点,指出实验过程中液面波动现象是金属中溶入了过多的氧所致.
In the experiment, HRB335 steel was treated by impulse current, and the maximum current, frequency and processing time were considered together. The optimal result is the following: the current density is 0.021-0.025 A/mm2, the frequency is 1 Hz and the processing time is 30 s or so. The maximum equiaxial crystal ratio is up to 95% and the crystals are obviously refined. Compared with the others' discoveries the primary inclusion was made that electropulse effect may be independent of steel species. Different opinions about the columnar crystal broken theory were proposed. It is considered that liquid level fluctuation phenomena are for too much oxygen is dissolved into the metal.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2004年第5期478-481,共4页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金委资助项目(No.30160186)
关键词
脉冲电流
HRB335钢
宏观组织
Current density
Electric frequency control
Solidification
Steel structures