【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.更多还原

【Abstract】 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 equiaxal crystal ratio is up to 95% and the crystals are obviously refined. Compared with others’ discoverits 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.更多还原