Components produced from sintered titanium alloys are increasingly used in mechanical engineering but need to be protected for operation in corrosive environments because of porosity. Nitriding is one of the effective protection methods. The objective of the study was to analyze the nitriding kinetics of a sintered VT1-0 titanium alloy at atmospheric (105 Pa) and reduced (1 Pa) nitrogen pressure at 800, 850, and 900°C for 5, 10, and 20 h versus a wrought titanium alloy of the same composition. The study employed discrete gravimetry, hardness measurement, optical and electronic metallography, profilometry, and X-ray diffraction. The nitriding kinetics of the VT1-0 titanium alloy sintered from titanium powder alone and from a mixture of titanium and titanium hydride powders was studied in comparison with wrought titanium. Under the nitriding parameters in question, the weight gain of all samples was described by a parabolic law and the weight gain of the sintered samples was higher than that of the wrought ones. The kinetic parameters of nitriding for the sintered and wrought VT1-0 titanium alloys were determined for the first time in the test temperature–time and gas dynamic conditions. Changes in the surface and near-surface layers depending on metal porosity were shown. After nitriding, the surface microhardness of the sintered titanium was lower than that of the wrought titanium samples because of porosity, and the strengthened surface layer was thicker. The nitride film formed on the sintered titanium alloy was thinner and less distorted than that on the wrought titanium alloy. The results can be used to develop nitriding conditions for sintered VT1-0 titanium products.

中文翻译：

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烧结VT1-0钛合金的渗氮

由烧结钛合金制成的部件越来越多地用于机械工程，但由于多孔性，需要保护以在腐蚀性环境中运行。氮化是有效的保护方法之一。本研究的目的是分析烧结 VT1-0 钛合金在常压 (105 Pa) 和减压 (1 Pa) 氮气压力下在 800、850 和 900°C 下的渗氮动力学，时间为 5、10 和 20 小时。与相同成分的锻造钛合金相比。该研究采用了离散重量法、硬度测量法、光学和电子金相学、轮廓测定法和 X 射线衍射法。VT1-0 钛合金由单独的钛粉末和由钛和氢化钛粉末的混合物烧结而成的 VT1-0 钛合金的氮化动力学与锻钛进行了比较研究。在所讨论的氮化参数下，所有样品的增重均由抛物线定律描述，烧结样品的增重高于锻造样品的增重。首次在试验温度-时间和气体动力学条件下确定了烧结和锻造 VT1-0 钛合金的渗氮动力学参数。显示了取决于金属孔隙率的表面层和近表面层的变化。氮化后烧结钛表面显微硬度低于锻压钛样品，因为存在孔隙，强化表面层较厚。烧结钛合金上形成的氮化膜比锻造钛合金上的氮化膜更薄且变形更小。