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TC4 Heat Treatment

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    Original Title: TC4 Heat Treatment TC4Ti-6Al-4V Elongation Properties 1, TC4/Ti-6Al-4V titanium alloy With the development of aviation industry, the demand for high-end superalloys continues to grow. High temperature titanium alloys are widely used in aviation industry due to their high specific strength. In particular, the application of high-temperature titanium alloys in aero-engines can reduce the mass of the engine, improve the fuel output power and reduce noise. The main high temperature titanium alloys at home and abroad are Ti1000 in the United States, IMI834 in the United Kingdom, BT36 in Russia and Ti600 in China. These titanium alloys have high instantaneous strength and creep strength at high temperature. High performance TC4/Ti-6Al-4V titanium alloy bar is the most widely used high strength titanium alloy profile at present. By changing the alloy element content and improving the processing technology, better high temperature performance can be obtained, which is of great significance in actual production and research and development. For TC4 titanium alloy with different composition and processing technology, it is also of great significance to test whether it has the creep performance in line with the actual production requirements. Because TC4 titanium alloy is mainly served at 400 ℃ at present,ti6al4v, the multi-stress creep data of TC4 titanium alloy at this temperature were tested, the time-stress curve under certain residual deformation was drawn, and the creep properties of TC4 titanium alloys were analyzed and discussed. 1.1 Its high temperature creep performance directly affects the development and use of materials. The creep test of TC4 titanium alloy bar, which is the most widely used at present, was carried out to analyze the relationship between the total elongation,titanium tubing price, residual deformation stress and time under the condition of 400 ℃ and certain residual deformation. The results show that at 400 ℃, the time required for the creep stabilization process of TC4 titanium alloy bars decreases with the increase of the test stress, and the steady-state creep rate increases with the increase of the test stress. 1% and 0. Under the condition of 2% residual deformation, the relationship between the test stress and the test time in the test stage is approximately linear when the logarithm is taken. Effect of heat treatment on microstructure and properties of titanium alloy At present, in the process of analyzing the structure and performance of titanium alloy, the characteristics of heat treatment should be clarified first. Heat treatment mainly depends on the decomposition operation of metastable phase formed by two-phase titanium alloy during quenching, so as to ensure that there will be no obvious strengthening problem during martensitic transformation in titanium alloy. At the same time, ti6al4v eli ,titanium tubing price, allotropic transformation will occur in titanium alloy. And then it is difficult to play a role in refining the titanium alloy, because the thermal conductivity of the titanium alloy is relatively poor, so if the problem of local deformation or temperature rise occurs, Widmannstatten structure will be formed, and then the thermal conductivity of the whole titanium alloy material will be reduced, especially in the process of heat treatment for some alpha plus beta titanium alloys, because the quenching thermal stress is relatively large, Therefore, it is very easy to cause bending problems of titanium alloy parts. 2.1 Because the chemical properties of titanium and titanium alloy substances are relatively active, and hydrogen evolution reaction is very easy to occur, causing hydrogen embrittlement problems, so in the process of heating titanium alloy substances with heating furnace, the atmosphere must be strictly controlled, and titanium and titanium alloy substances are also easy to react with water vapor and oxygen. Then the dense oxide layer appears on the surface of the titanium alloy, which affects the performance of the whole titanium alloy. Therefore, the influence of the oxide layer should be clarified in the process of heat treatment. Expand the full text 2.2 The phase transformation temperature of titanium alloy will be affected by the melting conditions and parameters, such as the vacuum degree in the heating furnace, the times of melting and the impurity content, which will have a certain impact on the phase transformation temperature of titanium alloy, especially when the titanium alloy substance is heated in the beta type, the growth tendency of beta type titanium alloy is relatively large. Therefore, the heating temperature and holding time should be strictly controlled at this time to prevent the plasticity and other properties of grains from being affected during the heat treatment process of β-type titanium alloy. At this stage, the use of heat treatment process will have a certain impact on the microstructure and properties of TC4 titanium alloy, because the application of titanium alloy is more and more extensive, so it is of great significance to explore its specific impact. Key words: TC4 titanium alloy, heat treatment process,titanium filler rod, microstructure, properties, prospect demand TC4/Ti-6Al-4V Return to Sohu to see more Responsible Editor:. yunchtitanium.com

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