1000MPa-grade nitric acid corrosion resistant titanium alloy

A titanium alloy and nitric acid technology, which is applied in the field of 1000MPa level nitric acid corrosion resistant titanium alloy, can solve the problems of unsatisfactory mechanical properties and boiling nitric acid resistance, and achieve excellent cold and hot workability, excellent nitric acid corrosion resistance, good The effect of applying the foreground

Active Publication Date: 2021-09-28
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some working conditions of post-processing projects, such as toothed runners, jet pumps, valve bodies and other key components, in addition to nitric acid corrosion resistance, their strength needs to reach more than 900 MPa. The existing post-processing corrosion-resistant titanium alloy The mechanical properties do not meet the requirements, and the aerospace β-type high-strength titanium alloy developed based on β-element strengthening has good mechanical properties, but it cannot meet the severe working conditions of boiling nitric acid resistance in the post-processing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The 1000MPa grade nitric acid corrosion-resistant titanium alloy of this embodiment is composed of the following components in mass percentage: Ta5.0%, V5.0%, Cr8.0%, Al0.9%, and the balance is Ti and unavoidable impurities.

[0023] This embodiment includes the following steps:

[0024] Step 1. Mix titanium sponge, Ti-Ta master alloy, Al-V master alloy and electrolytic Cr powder and press to obtain an electrode;

[0025] Step 2, subjecting the electrode obtained in step 1 to vacuum consumable arc melting for three times to obtain an alloy ingot;

[0026] Step 3, peeling off the alloy ingot obtained in step 2, cutting the riser and cutting the tail end in turn, and then performing blank forging, multi-fire intermediate forging and finished forging on the forging machine in sequence to obtain a nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1050°C, the temperature of the multi-fire intermediate forging is 900°C, and the temperatu...

Embodiment 2

[0030] The 1000MPa grade nitric acid corrosion-resistant titanium alloy of this embodiment is composed of the following components in mass percentage: Ta 6.0%, V 6.0%, Cr 7.0%, Al 1.0%, and the balance is Ti and unavoidable impurities.

[0031] This embodiment includes the following steps:

[0032] Step 1. Mix titanium sponge, Ti-Ta master alloy, Al-V master alloy and electrolytic Cr powder and press to obtain an electrode;

[0033] Step 2, subjecting the electrode obtained in step 1 to vacuum consumable arc melting for three times to obtain an alloy ingot;

[0034] Step 3, peeling off the alloy ingot obtained in step 2, cutting the riser and cutting the tail end in turn, and then performing blank forging, multi-fire intermediate forging and finished forging on the forging machine in sequence to obtain a nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1150°C, the temperature of the multi-fire intermediate forging is 980°C, and the tempe...

Embodiment 3

[0038]The 1000MPa grade nitric acid corrosion-resistant titanium alloy of this embodiment is composed of the following components in mass percentage: Ta 4.0%, V 4.0%, Cr 9.0%, Al 0.7%, and the balance is Ti and unavoidable impurities.

[0039] This embodiment includes the following steps:

[0040] Step 1. Mix titanium sponge, Ti-Ta master alloy, Al-V master alloy and electrolytic Cr powder and press to obtain an electrode;

[0041] Step 2, subjecting the electrode obtained in step 1 to vacuum consumable arc melting for three times to obtain an alloy ingot;

[0042] Step 3, peeling off the alloy ingot obtained in step 2, cutting the riser and cutting the tail end in turn, and then performing blank forging, multi-fire intermediate forging and finished forging on the forging machine in sequence to obtain a nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1100°C, the temperature of the multi-fire intermediate forging is 950°C, and the temper...

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Abstract

The invention discloses a 1000MPa-grade nitric acid corrosion resistant titanium alloy. The alloy comprises the following components of, by mass, 4%-6% of Ta, 4%-6% of V, 7%-9% of Cr, not larger than 1.5% of Al and the balance Ti and inevitable impurities, wherein the tensile strength of the titanium alloy subjected to solution aging treatment is not less than 1000 MPa, the yield strength is not less than 900 MPa, and the corrosion rate in a boiling nitric acid solution with the concentration of 6 mol/L is not higher than 0.1 mm/a. The novel titanium alloy designed by optimizing the beta stable element and the proportion thereof is simple in composition, not prone to segregation, uniform and stable in structure, excellent in cold and hot workability and easy to prepare; compared with an existing titanium alloy, the nitric acid corrosion resistance is improved, meanwhile, the tensile strength and the yield strength are greatly improved; and the alloy is applied to nuclear power and chemical engineering equipment and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nitric acid corrosion-resistant titanium alloys, and in particular relates to a 1000MPa grade nitric acid corrosion-resistant titanium alloy. Background technique [0002] In the selection of structural parts of nuclear spent fuel reprocessing equipment, nitric acid-resistant stainless steel was used in the early stage. However, with the deepening of nuclear fuel consumption, these materials have intergranular corrosion and root corrosion of welded joints, which are difficult to meet the requirements of long-term use. status requirements. With the increase of U235 concentration in power reactor fuel and the deepening of burnup, the content of transuranic elements and fission products in spent fuel increases, which in turn enhances the corrosiveness of nitric acid solution. Therefore, the use of new materials with stronger corrosion resistance to replace ultra-low carbon stainless steel is an internationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18C22C1/03
CPCC22C14/00C22F1/183C22C1/03
Inventor 赵恒章吴金平吴俊宇杨帆赵彬潘晓龙张于胜
Owner 西安稀有金属材料研究院有限公司
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