High-temperature-resistant titanium alloy plate and annealing method thereof

Abstract

The invention discloses a high-temperature-resistant titanium alloy plate. A titanium alloy plate material is prepared from the following components in percentage by weight: 0.5 to 1.2 percent of aluminum, 3 to 5 percent of silicon, 0.2 to 0.5 percent of iron, 1.2 to 1.8 percent of nickel, 0.1 to 0.2 percent of carbon and the balance of titanium. A preparation process of the titanium alloy plate comprises the following steps: 1, mixing all the raw materials according to the formula amounts, feeding the mixture into a vertical type induction heating furnace, controlling heating temperature at 1,400 to 1,450 DEG C for smelting, and performing ingoting to form a titanium alloy ingot; 2, performing hot rolling on the titanium alloy ingot prepared in the step 1 to prepare a titanium alloy plateblank; 3, performing thermal treatment on the titanium alloy plate blank prepared in the step 2; 4, performing alkaline pickling on the titanium alloy plate subjected to the thermal treatment in thestep 3 to remove a surface oxide film, and mechanically grinding the titanium alloy plate till the surface coarseness is 0.5 to 1 [mu]m, thereby obtaining the titanium alloy plate. The high-temperature-resistant titanium alloy plate is good in thermal stability and high-temperature creep resistance. The invention further discloses a method of annealing the titanium alloy plate.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy plate processing, and relates to a high-temperature-resistant titanium alloy plate, and also relates to a method for annealing the above-mentioned titanium alloy plate. Background technique [0002] The thermal stability of current high-temperature titanium alloy plates is often not ideal, and the creep resistance performance of titanium alloy plates is significantly reduced during use in high-temperature environments. The main reason is that high-temperature titanium alloy plates are generally made of high-temperature titanium alloys, but high-temperature Due to its high alloying, the probability of brittle phase precipitation increases after a long time of working in titanium alloy, resulting in unstable structure. At the same time, the processing technology of the high-temperature titanium alloy plate is complicated and the processing cost is high. [0003] Due to the strong chemical ac...

AI Technical Summary

Problems solved by technology

[0005] 1. Low production efficiency

Due to the relatively low thermal conductivity of titanium, resistance furnaces are used for indirect heating. In vacuum, heat transfer is mainly by thermal radiation, and the heat conduction speed is very slow.

[0006] 2. High cost

(1) The energy consumption in the annealing process is high. First, in the process of heating up, heat preservation, and cooling, the plate consumes heat energy, and the water-cooled furnace shell also consumes heat energy; the second is that the huge vacuum unit consumes a lot of power and water consumption. Large, leading to high operating costs

(2) The annealing furnace that meets the vacuum operating conditions has a large volume, complex structure, and high equipment investment

(3) Titanium and its alloys are easy to interact with lubricants and oil stains on the surface of the titanium alloy plate at high temperatures. The titanium alloy plate lasts for a long time under the high temperature state in the annealing furnace. In order to prevent the titanium alloy plate from interacting with pollutants And to prevent the oil stain from contaminating the furnace after high temperature decomposition, the titanium alloy plate must be cleaned strictly before vacuum annealing. cumbersome and increases production costs

(4) Forced cooling by introducing inert gas, although it can improve part of the production efficiency and reduce energy consumption, but the price of argon gas is relatively expensive, which increases the cost of material consumption

[0007] 3. The scope of application is small and the limitations are large

(1) The production cost of the vacuum annealing furnace is high, and the furnace is generally opened after the processed plate reaches a certain amount, which is only suitable for large-scale continuous production

(2) Since the furnace chamber of the annealing furnace is closed and its length is limited, the length of the processed plate is limited

[0008] 4. There are certain problems in the quality of the board (1) Poor consistency

During vacuum annealing, due to the uneven temperature distribution in the furnace, the heating temperature and time of the plates located at the edge of the furnace, the center of the furnace, and the two ends of the furnace are quite different. Therefore, the consistency of the properties of the plates in the same furnace is poor.

Due to the unreasonable annealing operation and the different charging materials in each furnace, the plates annealed in each furnace are often quite different, the performance of the plates fluctuates greatly, and the stability is poor

(2) Product organization and performance are relatively poor

The titanium alloy plate heats up slowly for a long time, the deformation energy stored in the titanium lattice is gradually consumed, the nucleation ability of recrystallization is weakened, and the grains after annealing are relatively coarse, resulting in relatively low strength and plasticity of the product

[0009] 5. The equipment covers a large area; the noise pollution generated by the vacuum unit is serious

[0010] 6. Inconvenient maintenance of equipment

The pre-vacuum charging / cooling chambers at both ends work alternately, although the utilization rate of the vacuum annealing furnace has been improved to a certain extent, but due to the constraints of the cooling process, there are still defects in the annealing of the traditional vacuum resistance furnace

In addition, its equipment is bulkier and more expensive, making it difficult to popularize and apply