电脉冲脉宽对高硼中碳合金钢凝固组织的影响

Effects of Electric Pulse Width on Solidification Structure of High-Boron Middle-Carbon Alloy Steel

为改变高硼中碳合金钢中硬质相的形态和分布,在高硼中碳合金钢凝固过程中施加电压1 600V、频率30Hz、脉宽不同的电脉冲,并研究了电脉冲脉宽对其凝固组织的影响规律。结果表明,经过电脉冲处理,高硼中碳合金钢凝固组织中马氏体片层间距变小,基体中W、Cr、Mo、V等合金元素含量升高,基体硬度提高;硬质相体积分数降低,片层状硬质相消失,网状硬质相产生断网现象,硬质相形态和分布也变得均匀。随着电脉冲脉宽的增加,断网现象先变得明显,后又减弱。在该试验条件下,脉宽为30μs时,断网现象最明显,硬质相的分布和形状也最均匀。

The effect of electric pulse with different pulse width on the solidification structure of high-boron middle- carbon alloy steel was investigated. The experimental results indicate that after electric pulse, the martensite la- mellar spacing become smaller. With increase of alloying elements such as W, Cr, Mo and V contenting in matrix, hardness of matrix can be improved. Hard phase volume fraction is reduced, slice layer hard phase disappears, mesh hard phase is broken network and hard phase distribution became even. Along with the increase of pulse width, broken network first become apparent, and then decreases. In the experimental conditions, pulse width for 30μs, the phenomenon of broken network is the most obvious and hard phase distribution the most evenly.