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在氮气为负压及不同温度条件下(750、800、850和900℃)对TC4钛合金进行真空脉冲渗氮处理,采用X射线衍射,自动显微硬度测试、滑动干摩擦及电化学极化试验等手段分析了渗氮硬化层的组织与性能。结果表明:TC4钛合金渗氮处理后表面形成了一层由TiN_(0.3)、TiN、Ti_2N和AlTi_2N组成的多相化合物层;其表面硬度、渗层深度及耐磨性均随渗氮温度升高而提高。其中,850℃渗氮后合金有效硬化层深度约为30μm,硬度梯度平缓,其磨损量比原样下降1个数量级,综合性能最优。真空渗氮后合金耐蚀性均能得到大幅度改善。
The TC4 titanium alloy was subjected to vacuum pulse nitriding under nitrogen at negative pressure and different temperature (750, 800, 850 and 900 ℃). X-ray diffraction, automatic microhardness test, sliding dry friction and electrochemical polarization Test and other means to analyze the nitriding harden layer organization and properties. The results show that a multi-phase compound layer composed of TiN_ (0.3), TiN, Ti_2N and AlTi_2N is formed on the surface of TC4 titanium alloy after nitriding treatment. The surface hardness, depth of penetration layer and wear resistance are all increased with the increase of nitriding temperature High and improve. Among them, the depth of effective hardened layer after nitriding at 850 ℃ is about 30μm, the hardness gradient is gentle, the wear loss is one order of magnitude lower than the original one, and the comprehensive performance is the best. The corrosion resistance of the alloy after vacuum nitriding can be greatly improved.