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以35钢为材料,研究了添加直流电场盐浴碳氮共渗技术。该技术在碳氮共渗盐浴中通过在被渗样品间施加合适参数的直流电场予以实现。分析了渗层的显微组织及白亮层厚度,测量了渗层硬度沿层深的分布,并进行了物相分析。实验结果表明:直流电场可以显著提高碳氮共渗速度;在碳氮共渗温度575℃,保温50 min,添加强度为7.5 V的直流电场时,白亮层厚度可以达到18.4μm,约是常规盐浴碳氮共渗获得白亮层厚度的两倍;电场快速盐浴碳氮共渗后试样表面硬度达到730 HV0.01;同时对电场快速盐浴碳氮共渗机理进行了讨论。
Taking 35 steel as material, the technology of salt-bath carbonitriding with DC electric field was studied. This technique is performed in a carbonitriding salt bath by applying a suitable DC field across the sample being seeped. The microstructure of the layer and the thickness of the white bright layer were analyzed. The distribution of hardness along the layer depth was measured and the phase analysis was carried out. The experimental results show that the DC electric field can significantly increase the carbonitriding rate. When the carbonitriding temperature is 575 ℃ and the holding time is 50 min, the thickness of the white bright layer can reach 18.4 μm when the DC electric field is 7.5 7.5 V, The bath carbonitriding doubled the thickness of the bright white layer. The surface hardness of the sample after rapid electric salt carbonitriding reached 730 HV0.01. The mechanism of rapid salt bath carbonitriding was also discussed.