Titanium alloy capable of resisting high temperature higher than 600 DEG C

Abstract

The invention discloses a titanium alloy capable of resisting high temperature higher than 600 DEG C. The chemical elements of the titanium alloy are 5.5 to 7.0 percent by weight of Al, 2.5 to 4.0 percent by weight of Sn, 1.0 to 3.0 percent by weight of Zr, 1.0 to 3.0 percent by weight of Mo, 1.5 to 3.0 percent by weight of Nb, 0.10 to 0.40 percent by weight of Si, 0.05 to 1.0 percent by weight of Ce, 0.1 to 5.0 percent by weight of Ta, 0.1 to 2.0 percent by weight of C, 0.1 to 2.0 percent by weight of B and the balance of Ti and other inevitable impurities. The titanium alloy can be used under the temperature higher than 600 DEG C, and guarantees excellent mechanical properties under the high temperature at the same time.

Description

technical field [0001] The invention relates to a titanium alloy, in particular to a high temperature resistant titanium alloy. Background technique [0002] Titanium alloys are widely used in aerospace because of their high specific strength. Since the 1980s, countries such as the United States, Britain, and Russia have successfully developed alloys such as Ti-1100, IMI834, and BT36. The use temperature of these titanium alloys reaches 550-600 °C. Ti-600 and Ti-60 high-temperature titanium alloys used at 600°C have also been developed in China. [0003] With the development of modern aerospace technology, the demand for high-temperature titanium alloys with a temperature higher than 600 °C is also increasing. At present, the main problem encountered in the development of titanium alloys with a service temperature higher than 600 °C is the contradiction between the thermal stability of the alloy and the thermal strength. The thermal stability involves the stability of the ...

AI Technical Summary

Problems solved by technology

[0004] The publication number is CN1031721, the publication date is March 15, 1989, and the name is "a heat-resistant titanium alloy" Chinese patent document; and the publication number is CN101050479, the publication date is October 10, 2007, and the name is "a The titanium alloys involved in the Chinese patent document "a high-temperature solid-solution strengthened heat-resistant titanium alloy containing rare earths" have respectively added rare earth elements neodymium and yttrium. Although the addition of rare earth elements can refine the crystal grains and improve creep performance, the use temperature It still stays at 600°C. The reason is that the high alloying adopted in pursuit of strength increases the probability of brittle phase precipitation after the alloy works for a long time, resulting in unstable structure.

In addition, the infiltration of oxygen at high temperature will form an oxygen-rich layer on the surface of the alloy, which will lead to the instability of the alloy surface

[0005] The publication number is CN101074464, and the publication date is November 21, 2007. The titanium alloy involved in the Chinese patent document named "composite strengthened heat-resistant titanium alloy" has added rare earth elements lanthanum and boron, so that its service temperature can be higher than 600 °C. ℃, but because it is a composite material reinforced by particles and short fibers, the introduction of a hard second phase leads to poor processability of the material

Although it has good comprehensive performance above 600 °C, its processing range is narrow and the thermal processing temperature is high, which increases the processing difficulty of the material and increases the cost of the material.

Images