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A kind of preparation method of zirconium and zirconium alloy coarse grain

A zirconium alloy and coarse crystal technology, which is applied in the field of coarse crystal and single crystal material research, can solve the problems that do not involve the preparation method of zirconium and zirconium alloy coarse crystal or single crystal, and achieves easy operation, wide applicability and simple process. Effect

Active Publication Date: 2021-12-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to existing reports, there is no preparation method for any kind of zirconium and zirconium alloy coarse crystals or single crystals

Method used

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  • A kind of preparation method of zirconium and zirconium alloy coarse grain
  • A kind of preparation method of zirconium and zirconium alloy coarse grain
  • A kind of preparation method of zirconium and zirconium alloy coarse grain

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Vacuum arc melting of pure zirconium (purity mass fraction>99.9%) sponge zirconium to obtain a button ingot with a mass of 65g. For the microstructure of the button ingot, see image 3 ;

[0031] (2) Seal the button ingot into the quartz tube and vacuumize it (vacuum degree-3 Pa), then filled with argon (0.5Mpa);

[0032] (3) The vacuum-protected sample was subjected to solid solution treatment at 1200°C in an ultra-high temperature resistance furnace, kept for 8 hours, and the cooling method was furnace cooling;

[0033] (4) Repeat the above-mentioned solution treatment process at 1200° C. for 5 times.

[0034] (5) The sample treated in step (4) is subjected to solution treatment for a long time below the α transformation point. The specific solution treatment temperature is 860° C., the solution time is 100 h, and the cooling method is furnace cooling.

[0035] Pure zirconium samples were pre-ground and mechanically polished, and then treated with a volume ratio...

Embodiment 2

[0037] (1) Cut a block sample of 10*10*10mm on a Zircaloy-4(Zr-1.5Sn-0.2Fe-0.1Cr)(Zr-4) alloy plate with a thickness of 10mm, and its original structure can be found in Figure 5 ;

[0038] (2) Seal the bulk sample in a quartz tube and vacuumize it (vacuum degree-3 Pa), then filled with argon (0.5Mpa);

[0039] (3) The vacuum-protected sample was subjected to solution treatment at 1300°C in an ultra-high temperature resistance furnace, kept for 10 hours, and the cooling method was furnace cooling;

[0040] (4) Repeat the above-mentioned solution treatment process at 1300° C. for 3 times.

[0041] (5) The sample treated in step (4) was subjected to solution treatment for a long time below the α phase transformation point. The specific solution treatment temperature was 880° C., the solution time was 200 h, and the cooling method was furnace cooling.

[0042] The Zr-4 alloy sample was pre-ground and mechanically polished, and then the volume ratio was 9(H 2 O): 9 (HNO 3 ): 2...

Embodiment 3

[0044] (1) Cut a block sample of 5*10*10mm on a Zirlo (Zr-1.0Nb-1.0Sn-0.1Fe) alloy plate with a thickness of 5mm, and see the original structure Figure 7 ;

[0045] (2) Seal the bulk sample in a quartz tube and vacuumize it (vacuum degree-3 Pa), then filled with argon (0.5Mpa);

[0046] (3) The vacuum-protected sample was subjected to solution treatment at 1250°C in an ultra-high temperature resistance furnace, kept for 12 hours, and the cooling method was furnace cooling;

[0047] (4) Repeat the above-mentioned solution treatment process at 1250° C. for 5 times.

[0048] (5) The sample treated in step (4) is subjected to solution treatment for a long time below the α transformation point. The specific solution treatment temperature is 870° C., the solution time is 150 h, and the cooling method is furnace cooling.

[0049]Zirlo alloy samples were pre-ground and mechanically polished, and then treated with a volume ratio of 9(H 2 O): 9 (HNO 3 ): 2 (HF) etchant to wipe the ...

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Abstract

The invention provides a method for preparing coarse crystals of zirconium and zirconium alloys, which is characterized in that: first, the invention performs multiple vacuum solid solution treatments above the β phase transition point of the zirconium alloy at 200°C, and the cooling method is furnace cooling; Vacuum solution treatment is carried out for a long time below the phase transition point, and the cooling method is furnace cooling. Coarse lamellar tissue can be obtained. The invention satisfies the urgent demand of the academic circles for the coarse grains of zirconium and zirconium alloys, and provides good raw materials for the research work on the corrosion anisotropy and mechanical anisotropy of zirconium alloys and some deep-level mechanisms of zirconium and zirconium alloys means of preparation.

Description

technical field [0001] The invention relates to the research field of coarse crystals and single crystal materials, and in particular provides a method for preparing zirconium and zirconium alloy coarse crystals. Background technique [0002] Opening the microscopic world of metal materials, the existence of grain boundaries can be observed. Grain boundaries play a very important role in the plastic deformation of polycrystalline materials. For example, at low temperature (T<0.5T m when T m is the melting point expressed in K), and the grain boundary acts as a barrier to dislocation movement. Movable dislocations accumulate on the grain boundaries, causing stress concentration at the grain boundaries, and the stress concentration can be released by initiating local multi-slip. The famous Hall-Petch shows that the yield strength of the alloy can be increased by reducing the grain size. In fact, among several traditional means of strengthening materials, fine-grain str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02
CPCC22F1/186C22F1/02
Inventor 李阁平袁福森韩福洲张英东郭文斌阿里·穆罕默德任杰刘承泽顾恒飞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI