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采用脉冲爆炸-等离子体(PDP)技术对T8钢进行不同距离的表面改性处理。采用SEM、XRD分析了PDP处理前后T8钢的表层组织和相结构,利用显微维氏硬度计、摩擦磨损试验机和电化学工作站研究了PDP处理前后T8钢的显微硬度、耐磨损性能和耐腐蚀性能。结果表明,当处理距离为100 mm时,T8钢表面形貌基本未发生变化。当处理距离减少到50 mm和30 mm时,T8钢表面发生了重熔导致的光滑化现象,同时出现大量火山状熔坑,熔坑的出现是由PDP的能量和材料本身的不均匀性造成的。PDP处理使T8钢表面发生由马氏体α’-Fe向奥氏体γ-Fe的转变,并发生渗氮现象形成Fe_3N。T8钢改性层厚度随着处理距离的减小而增加,当处理距离小于50 mm时,改性层厚度变化不大,约为68μm。PDP处理后T8钢显微硬度、耐磨损性能和耐腐蚀性能都有一定程度的提高,显微硬度最高约为基体的2倍,耐磨损性能最高为基体的2.6倍。
The surface modification of T8 steel at different distances was performed by using pulse explosion-plasma (PDP) technology. The surface microstructure and phase structure of T8 steel before and after PDP were analyzed by SEM and XRD. The microhardness and wear resistance of T8 steel before and after PDP were studied by micro Vickers hardness tester, friction and wear tester and electrochemical workstation. And corrosion resistance. The results show that when the processing distance is 100 mm, the surface morphology of T8 steel basically does not change. When the treatment distance is reduced to 50 mm and 30 mm, the surface of T8 steel melts due to remelting, and a large number of volcano-shaped craters appear. The appearance of craters is caused by the energy of the PDP and the material itself of. PDP treatment causes the transformation of martensite α’-Fe to austenite γ-Fe on the surface of T8 steel, and nitriding occurs to form Fe_3N. The thickness of T8 steel modified layer increases with the decrease of treatment distance. When the treatment distance is less than 50 mm, the thickness of modified layer does not change much, about 68μm. T8 steel after the PDP treatment of microhardness, wear resistance and corrosion resistance have improved to some extent, the maximum microhardness of about 2 times the matrix, the highest wear resistance of 2.6 times the matrix.