论文部分内容阅读
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。
In order to change the morphology and distribution of hard phase in high boron medium carbon alloy steel, electrical pulses with voltage of 1 600V, frequency of 30Hz and different pulse width were applied during the solidification of high boron medium carbon steel. The solidification of its impact on the law. The results show that the martensite lamella spacing in the solidified microstructure of high boron medium carbon steel decreases after electrical pulse treatment, and the contents of W, Cr, Mo, V and other alloying elements in the matrix increase, and the hardness of the matrix increases. The fraction decreases, lamellar hard phase disappears, the network-like hard phase breaks the network, and the morphology and distribution of the hard phase become even. As the pulse width of the electric pulse increases, the phenomenon of breaking the network becomes obvious first and then weakens. Under this test condition, the phenomenon of broken wire is the most obvious when the pulse width is 30 μs, and the distribution and shape of the hard phase are the most uniform.