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A kind of preparation method of zirconium-niobium alloy with α/β double state structure

A technology of zirconium-niobium alloy and structure, which is applied in the field of alloy material preparation to achieve the effect of increased strength and excellent tensile plasticity

Inactive Publication Date: 2011-11-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there have been no reports of similar structures in zirconium alloys. If zirconium alloys with dual-state structures can be prepared, the service life of zirconium alloy components in high-temperature and high-pressure environments will be significantly improved.

Method used

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  • A kind of preparation method of zirconium-niobium alloy with α/β double state structure
  • A kind of preparation method of zirconium-niobium alloy with α/β double state structure
  • A kind of preparation method of zirconium-niobium alloy with α/β double state structure

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Effect test

Embodiment 1

[0022] The Zr705 plate was first kept at 1000°C for 1 hour and then water quenched to obtain α-single-phase martensite, such as figure 1 shown. The above alloy at 600 o Rolling is carried out after 30 minutes of C heat preservation, the deformation amount is 60%, and air-cooled to room temperature after deformation. Then coat the surface of the deformed alloy with a layer of anti-oxidation and anti-decarburization coating (202 high-temperature anti-oxidation and anti-decarburization coating model 202, produced by Zhejiang Huangyan Special Coatings Factory, No. 230 Luting Road, Huangyan Economic Development Zone, Zhejiang Province), after drying Put it into a high-temperature furnace at a temperature of 900° C., keep it warm for 0.5 h, and then take it out and cool it to room temperature in air. A two-state structure composed of lamellar α / β structure with a volume fraction of equiaxed primary α phase of about 21% can be obtained, such as figure 2 shown. The equiaxed prima...

Embodiment 2

[0024] The Zr705 plate was firstly kept at 1050°C for 0.5h and then water quenched to obtain α single-phase martensite. Put the above alloy at 400 o Rolling is carried out after C is kept for 25 minutes, and the deformation amount is 40%. After deformation, it is air-cooled to room temperature. Then, coat the surface of the deformed alloy with a layer of anti-oxidation and anti-decarburization coating (high-temperature anti-oxidation and anti-decarburization coating, model JZ-403B, produced by Anqiu Huaxin Heat Treatment Material Factory, Economic and Technological Development Zone, Anqiu City, Shandong Province), and dry Finally, put it into a high-temperature furnace at a temperature of 850° C., keep it warm for 1.5 hours, and then take it out and air-cool it to room temperature. A two-state structure composed of lamellar α / β structure with a volume fraction of equiaxed primary α phase of about 30% can be obtained, such as image 3 shown. The equiaxed primary α-phase grai...

Embodiment 3

[0026] The Zr705 plate was firstly kept at 1000°C for 1 hour and then water quenched, and then kept at 600°C for 1 hour to obtain a basket-like structure, as shown in Figure 4 shown. The above alloy at 200 o C, after 20 minutes of heat preservation, rolling, the deformation amount is 50%, and air-cooled to room temperature after deformation. Coat the surface of the deformed alloy with a layer of anti-oxidation and anti-decarburization protective coating (high-temperature anti-oxidation and anti-decarburization protective coating, model KOC-02, Shanghai Runer Surface Material Co., Ltd., No. 2784, Cao'an Road, Shanghai). Put it into a high-temperature furnace at 850 °C, keep it warm for 1 hour, take it out and cool it to room temperature in air, and obtain a two-state structure with a volume fraction of equiaxed primary α phase of 36%, as shown in Figure 5 shown. The equiaxed α-phase grain size is 2-4 μm. The mechanical properties of the organization were tested, and the i...

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Abstract

The invention relates to a method for preparing a zirconium-niobium alloy with an alpha / beta dual-state organization, which mainly comprises the following steps of: firstly obtaining an alpha single-phase martensite or basket-shaped organization from the zirconium-niobium alloy and then rolling the alloy to deform at the temperature of 20-600 DEG C, wherein the deformation amount is 30%-60% and the alloy is air-cooled to room temperature after the alloy is deformed; and coating a layer of static high-temperature anti-oxidizing paint on the deformed alloy, putting the alloy in a furnace for annealing treatment after the paint is dried and the furnace temperature reaches 800-900 DEG C, taking out the alloy after heat-preserving for 0.5-2 hours and air-cooling the alloy to room temperature. The final heat-treatment process in the invention can be used for final heat treatment of the cold-deformed zirconium-niobium alloy and is also suitable for the final heat treatment of the hot-deformed zirconium-niobium alloy. The invention has the advantages that: the strength and the impact toughness of the zirconium-niobium alloy with the dual-state organization are respectively increased by about 2 times and 0.6 times of that of a zirconium-niobium alloy with the basket-shaped organization and an equiaxial organization, the strength is increased by about 100 MPa, and meanwhile, the excellent tensile ductility is remained.

Description

technical field [0001] The invention relates to a method for preparing an alloy material, in particular to a method for preparing a zirconium-niobium alloy. Background technique [0002] Zirconium niobium alloy has been widely used in the chemical industry and nuclear industry to prepare key components such as pressure pipes and pressure vessels due to its excellent corrosion resistance, stable radiation resistance, high strength, and low density. The main microstructures of zirconium-niobium alloys include α-single-phase martensite, equiaxed microstructure, and basket-like microstructure. [0003] The α-single-phase martensite is kept warm in the β-phase region by the zirconium-niobium alloy. After it is completely transformed into the β-phase, it is water-quenched and martensitic phase transformation occurs. The microstructure is characterized by large α grains, and the strength of α single-phase martensite is higher than that of the basket structure and equiaxed structur...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 杨志南刘峰超张福成
Owner YANSHAN UNIV
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