Low cost TiAl-based alloy with excellent high temperature performance and castability
A casting performance and high-temperature performance technology, applied in the field of low-cost titanium-aluminum-based alloys, can solve the problems of poor high-temperature oxidation resistance and creep resistance, high price, reduced high-temperature oxidation resistance and creep performance of materials, etc., to achieve The effect of excellent high temperature creep resistance, low cost and huge market prospect
Active Publication Date: 2013-06-05
LUOYANG SUNRUI TI PRECISION CASTING
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Problems solved by technology
The main material developed by Beigang Institute is Ti--(30-34wt%)Al--(1.0-6.0wt%)Cr--(1.0-6.0wt%)V--(0.001-0.5wt%)Mg material, At present, the most researched and tested component is Ti-46.5Al-1Cr-2.5V (at%) alloy (named TAC-2). After the diesel engine installation test, the material can be used for a long time at 800 ° C. The cast state of the material Both have good comprehensive mechanical properties at room temperature and high temperature, but the material has poor high temperature oxidation resistance and creep resistance, and it is difficult to use it for a long time at 850-900 °C
TAC-2 material contains more V elements (2.5at%), the increase of V elements will reduce the high temperature oxidation resistance and creep performance of the material, and V elements are expensive, which will greatly increase the cost of materials
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[0022]The titanium-aluminum material of the present invention adopts sponge titanium, pure Al, AlCr50 alloy, AlV55 alloy and pure C powder as raw materials, melts in a vacuum induction furnace and casts the turbine formwork and attached casting test rod. The melting method of titanium-aluminum ingots for casting is as follows: firstly vacuumize to 3.5Pa, then melt the raw materials of low-cost titanium-aluminum-based alloys with argon, the pressure of argon is 60000 Pa, and continue to stir for 2 minutes after all the melting is completed. The alloy ingot is repeatedly smelted twice. The casting process of the turbine formwork is as follows: the pre-vacuum degree is 3.5Pa, after the titanium-aluminum ingot is completely melted, continue to stir for 2 minutes before casting the turbine formwork and the attached casting test rod.
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The invention relates to a low cost TiAl-based alloy with excellent high temperature performance and castability. A concrete chemical component of the alloy comprises the following atoms: Ti, 44.0-48.0% of Al, 0.5-2.0% of Cr, 0.5-2.0% of V, 0.1-0.7% of C, and the balance of avoidless impurity elements. Compared with Ti-46.5Al-1Cr-2.5V alloy materials, the material of the alloy of the invention has a more excellent high temperature creep resistance, a more excellent oxidation resistance, a lower cost, and a same casting flow property, so the alloy is suitable for casting automobile components of Ti-Al turbines and the like which can be used for a long time at 850-900DEG C, thereby the alloy of the present invention has a huge market prospect.
Description
technical field [0001] The invention relates to a technology in the field of high-temperature alloys, in particular to a low-cost titanium-aluminum-based alloy with excellent high-temperature performance and casting performance. Background technique [0002] With the continuous improvement of the performance of engines such as aviation, aerospace, automobiles, and ships, higher requirements are put forward for the performance of high-temperature materials, that is, higher strength, oxidation resistance, and lighter density. γ-TiAl-based alloy materials have the advantages of good high temperature strength, creep resistance and oxidation resistance, etc., and are developing into a new generation of aero-engine materials, which can be used to manufacture compressors, gas turbine blades, compressor stator windshields, stator machines Blocks and other large-scale casting and forging parts with complex shapes can partially replace bulky nickel-based superalloys, which can reduce ...
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IPC IPC(8): C22C14/00
Inventor 陈志强周洪强
Owner LUOYANG SUNRUI TI PRECISION CASTING