Development Of Low-Cost Titanium Alloys And Ways To Improve Processing Performance
Titanium and titanium alloys Titanium and titanium alloys have the advantages of high specific strength, good corrosion resistance, and high temperature performance, and are widely used in aerospace, marine engineering, chemical industry, metallurgy, medical and health and other fields. With the development of the world economy and the new understanding of titanium materials in many countries, research and development have been carried out one after another, and practical applications in many fields have been realized. In particular, the rapid development of aerospace, petrochemical and shipbuilding industries has further promoted the research and development and production of titanium materials in various countries. However, due to the production and processing characteristics of titanium materials, its production process is complicated, the processing process is long, and the yield of finished products is low, so that the cost of its finished products has been high for a long time, which greatly limits its use in the civilian field. For this reason, the research and development of production technology of low-cost titanium alloy materials has become the focus of current research.
Today we will introduce to you the development ideas of low-cost titanium alloys in the industry and the ways to improve the processing performance of titanium alloys:
Low-cost titanium alloy development ideas
With the development of titanium and titanium alloy metallurgical technology and scientific and technological progress, titanium and titanium alloys have broad application prospects in aerospace, chemical metallurgy, ships, automobiles, construction, medical equipment, and sporting goods. However, due to the characteristics of high chemical activity, low thermal conductivity, difficult deformation, and high heat treatment control requirements of titanium and titanium alloys, it is very difficult to extract, smelt, and process titanium, which makes the production cost of titanium products expensive and limits the quality of titanium. Large-scale application of products, so a lot of research has been done at home and abroad on reducing the manufacturing and processing costs of titanium and titanium alloy products.
The cost of titanium and titanium alloy products mainly comes from the links of raw materials, smelting and deformation processing. In order to realize the low cost of titanium alloy products, it is necessary to start from two aspects of raw materials and processing and manufacturing technology.
At present, the main ways to reduce the cost of titanium products are: replacing expensive alloying elements with cheap alloying elements to design alloy components, improving alloy processing properties, and designing preparation and processing processes.
Ways to Improve Machinability of Titanium Alloys
Improve the processing performance of titanium alloy, mainly by adding alloy elements, on the one hand, improve the cold and hot deformation ability of titanium alloy, improve the deformation ability of the alloy, improve the yield of the alloy, thereby reducing the cost; on the other hand, improve the machining performance of the alloy, The alloy machining efficiency and surface quality are improved, thereby reducing costs.
At present, there are many titanium alloys successfully designed to improve the processing performance of titanium alloys, such as Japan's SP700 titanium alloy (Ti-4.5Al-3V-2Mo-2Fe), which has good superplasticity; Japan's DAT52F titanium alloy (Ti- 3Al -2V -0.2Si -0.47Ce -0.27La), which has excellent machinability; American β21s alloy (Ti-15Mo-2.7Nb-3Al-0.2Si), which has excellent cold workability, etc. SP700 titanium alloy achieves the superplasticity of the alloy by increasing the content of the isomorphic β-phase stable elements Mo, V and eutectoid-type stable elements Fe, while reducing its phase transition point and improving the diffusion capacity of the β-phase. SP700 titanium The alloy can exhibit superplasticity at (770-800) °C, and the elongation can reach 2000%. Compared with TC4 titanium alloy, SP700 titanium alloy has higher strength and plasticity, better fatigue performance, and better cold and hot workability. Well, the cold working rate can reach 70%; DAT52F alloy is added with rare earth elements to make it have excellent machinability.
The use of reasonable processing design can make the alloy have good processing performance and obtain huge benefits. For example, Timetal62S developed by Timet Company of the United States with Fe-Mo instead of Al-Mo master alloy has a cost of 75% to 80% of Ti-6Al-4V, and has excellent cold and hot workability and can be used for processing into aerospace sheet metal. gold products. Another example is the use of a solidification furnace to prepare oxygen-rich Ti-6Al-4V-0.25O under the condition of relaxing the oxygen content. Its bullet resistance, mechanical properties and processability are better than Ti-6Al-4V, but the cost is lower Low.
The thermal hydrogen treatment technology of titanium alloy developed in the late 1970s and 1980s is a very effective means to improve the processing properties of titanium alloys. The thermal hydrogen treatment technology mainly uses hydrogen-induced phase transformation, hydrogen plasticity and reversible alloying. , Reconstruct the microstructure, so as to achieve the purpose of improving the processing performance of titanium alloy. A lot of research work has been done on thermal hydrogen treatment technology at home and abroad, but the technology is rarely used in industry.
