Near alpha medium strength titanium alloy

A titanium alloy and alloy technology, which is applied in the field of near-α type medium-strength titanium alloys, can solve the problem that the process performance of Ti-6Al-4V titanium alloy cannot meet the requirements for use, achieve good welding performance and process performance, improve process performance, Good welding performance

Inactive Publication Date: 2009-08-05
BAOJI TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of use, it is found that the process performance of Ti-6Al-4V titanium alloy often cannot meet the requirements of use under many application conditions.

Method used

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  • Near alpha medium strength titanium alloy
  • Near alpha medium strength titanium alloy
  • Near alpha medium strength titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The ingredients are grouped according to weight percentage, Al: 5.5%, Mo: 1.5%, the balance is Ti and unavoidable impurities, and a Φ115mm / 20kg ingot is smelted, and the measured β transformation point is 1010-1020°C. The ingot is forged into a Φ20mm sample bar by using the above-mentioned A and B processes on the air hammer. After the sample bar is heat-treated at 870°C for 1 hour, the tensile sample is prepared according to the standard (GB / T228). According to the standard (GB / T229), impact samples were prepared and their properties were tested. The test results are shown in Table 1.

[0018] Table 1 Room temperature tensile and impact properties of Example 1

[0019]

Embodiment 2

[0021] The ingredients are formulated by weight percentage, Al: 6.0%, Mo: 2.0%, and the balance is Ti and unavoidable impurities. Melting a Φ115mm / 20kg ingot, the measured β transformation point is 1020~1030℃. The ingot is forged into a Φ20mm sample bar by the above-mentioned A and B processes on the air hammer. After the sample bar is kept at 870°C for 1 hour and air-cooled and heat-treated, the tensile sample is prepared according to the standard (GB / T228) and the standard (GB / T229) to prepare impact samples and test their performance. The test results are shown in Table 2.

[0022] The ingredients are formulated by weight percentage, Al: 6.0%, Mo: 2.0%, and the balance is Ti and unavoidable impurities.

[0023] Melting steps: batching, mixing, and pressing into consumable electrodes according to the above weight percentages, and performing two smelting in a vacuum consumable electric arc furnace, wherein the crucible specification for the first smelting is Φ80mm, the melt...

Embodiment 3

[0027] According to weight percentage, Al: 6.5%, Mo: 2.5%, the balance is Ti and unavoidable impurities, melting a Φ115mm / 20kg ingot, the measured β transformation point is 1020~1030℃. The ingot is forged into a Φ20mm sample bar by the above-mentioned A and B processes on the air hammer. After the sample bar is kept at 870°C for 1 hour and air-cooled and heat-treated, the tensile sample is prepared according to the standard (GB / T228) and the standard (GB / T229) to prepare impact samples and test their performance. The test results are shown in Table 3.

[0028] Table 3 Example 3 Room Temperature Tensile and Impact Properties

[0029]

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Abstract

The invention relates to a middle-strength near-alpha titanium alloy which is characterized by comprising the following chemical compositions by weight percentage: 5.0 to 7.0 percent of Al, 1.0 to 3.0 percent of Mo and the rest percent of Ti and inevitable impurities. Mo-containing metal powder or Al-Mo master alloy powder and other raw materials are used to prepare materials according to the compositions, and are mixed evenly to prepare electrodes; the materials are repeatedly smelted by vacuum consumable electroarc into cast ingots; the cast ingots are cogged by an air hammer or a hydraulic press after being heated, and are repeatedly processed into titanium alloy semi-finished products such as a plate, a tube, a cake, wire material, and the like by the air hammer, the hydraulic press, an extruding press or a rolling mill, and the like. The near-alpha titanium alloy has the strength level Rm of more than or equal to 800MPa with A being more than or equal to 12 percent, has good welding performance, technological properties and corrosion resistance can be processed into products such as the plate, the tube, the cake, the wire material, and the like and has low cost.

Description

technical field [0001] The invention relates to a near-alpha type medium-strength titanium alloy. Background technique [0002] Titanium and titanium alloys have excellent comprehensive properties such as low density, high specific strength, high temperature resistance, corrosion resistance, non-magnetic, biocompatibility, etc., and are used in aviation, aerospace, ships, weapons, petroleum, chemical, medical and other fields It has been widely used and highly valued by countries all over the world. However, due to the expensive raw materials of titanium alloys and the difficulties in smelting and processing, the production costs are very high, usually 8 to 10 times that of steel, which greatly limits the application of titanium alloys. For different purposes, since the 1950s, various countries have developed a series of titanium alloys. Among them, Ti-6Al-4V titanium alloy is the largest and most widely used. In the process of use, it is found that the process performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00
Inventor 王韦琪杨慧丽张平辉王小翔王永强李渭清
Owner BAOJI TITANIUM IND CO LTD
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