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采用金相显微镜、扫描电镜、能谱分析等手段,研究了不同频率和电压的电脉冲处理对1Cr18Ni9Ti钢固体氮碳共渗时渗层厚度和渗层元素分布的影响。结果表明,在550℃保温1 h的氮碳共渗工艺条件下,脉冲频率为9 Hz、脉冲电压为8 k V时的氮碳共渗效果最佳,渗层表面整齐清晰,没有脱氮现象且化合物层厚度大于传统的未经电脉冲处理氮碳共渗时的厚度。氮碳共渗时施加电脉冲处理可有效提高渗层厚度,达到了缩短工艺时间和节约能源的目的。
The influences of electrical pulse with different frequency and voltage on the thickness of the diffusion layer and the element distribution of the diffusion layer in 1Cr18Ni9Ti steel were studied by means of metallographic microscope, scanning electron microscope and energy spectrum analysis. The results show that the nitrocarburization with the pulse frequency of 9 Hz and the pulse voltage of 8 kV is the best under the nitrocarburizing process with the temperature of 550 ℃ for 1 h. The surface of the layer is neat and clear with no denitrification And the thickness of the compound layer is larger than the thickness of the conventional nitrocarburizing without electrical pulse treatment. Nitrocarburizing electrical pulse processing can effectively improve the thickness of the layer, to shorten the process time and save energy purposes.