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Method for manufacturing nuclear-power-used thrust disc by means of hot isostatic pressing diffusion bonding

A technology of hot isostatic pressure diffusion and thrust discs, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of uneven performance of wear-resistant layer materials and poor bonding strength, and achieve good interface bonding strength and interface High bonding strength and the effect of improving production efficiency

Active Publication Date: 2015-03-04
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the problems of poor interface bonding strength and uneven performance of wear-resistant layer materials in the traditional preparation of thrust disks for nuclear power

Method used

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  • Method for manufacturing nuclear-power-used thrust disc by means of hot isostatic pressing diffusion bonding
  • Method for manufacturing nuclear-power-used thrust disc by means of hot isostatic pressing diffusion bonding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Prepare ST12 powder by known method, the main elements are carbon 1.6%, chromium 31%, tungsten 9.15%, cobalt 58%, silicon 0.25%. The particle size of the powder is 45-180 μm.

[0025] 2. Design the sheath for hot isostatic pressing according to the shape and size of the finished product; the outer diameter of the product is 238mm.

[0026] 3. Fix the nickel-based superalloy forging N06600 inside the sheath; in order to cover both sides of the forging evenly with wear-resistant layers, the center of the forging needs to be consistent with the center of the sheath.

[0027] 4. The jacket is welded by argon tungsten arc welding; the welding process is a current of 80A, a voltage of 8V, and a welding speed of 30mm / min.

[0028] 5. Use helium detection mass spectrometer for leak detection.

[0029] 6. The degassing and heat preservation temperature is 380°C, and the vacuum degree is 2×10 -3 Pa, holding time is 2 hours.

[0030] 7. The hot isostatic pressing process is...

Embodiment 2

[0033] The difference between this embodiment and specific embodiment 1 is step 2: the outer diameter of the product is 600 mm. Step 4: Use argon tungsten arc welding to weld the sheath. The welding process is a current of 120A, a voltage of 15V, and a welding speed of 50mm / min. Step 6: The temperature for degassing and heat preservation is 400° C., and the time for degassing and heat preservation is 15 hours. Step 7: The hot isostatic pressing process is performed at a temperature of 1129° C., a pressure of 99 MPa, and a holding time of 3.8 hours. Step 8: Remove the sheath by machining. Others are the same as in Example 1.

Embodiment 3

[0035] The difference between this embodiment and specific embodiment 1 is step 2: the outer diameter of the product is 960 mm. Step 4: Use argon tungsten arc welding to weld the sheath, the current is 150A, the voltage is 18V, and the welding speed is 55mm / min. Step 6: The degassing and heat preservation temperature is 450° C., and the heat preservation time is 20 hours. Step 7: The hot isostatic pressing process is performed at a temperature of 1134° C., a pressure of 100 MPa, and a holding time of 4 hours. Step 8: Remove the sheath by machining. Others are the same as in Example 1.

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Abstract

The invention discloses a method for manufacturing a nuclear-power-used thrust disc by means of hot isostatic pressing diffusion bonding and belongs to the field of nuclear-power-used thrust disc manufacturing. The method comprises the processing steps of preparing ST12 powder and designing a packaging sheath used for hot isostatic pressing; making the outer diameter of a product 238 mm; fixing a nickel-base superalloy forged piece inside the packaging sheath; and welding the packaging sheath with the method of argon tungsten-arc welding, carrying out leakage detecting with a helium detection mass spectrometer, carrying out the hot isostatic pressing, removing the packaging sheath, and carrying out finish machining. The method for manufacturing the nuclear-power-used thrust disc by means of the hot isostatic pressing diffusion bonding has the advantages that build-up welding can be replaced, a wear-resistant layer of a large component can be even in performance and good in interface bonding strength, cost is reduced, the production cycle is shortened, metallurgical bonding of wear-resistant layer interfaces is achieved, the interface bonding strength can reach 20-40 MPA, and hardness can reach 55 HRC or higher.

Description

technical field [0001] The invention belongs to the technical field of preparation of thrust disks for nuclear power, and particularly relates to a method for preparing thrust disks for nuclear power by hot isostatic pressure diffusion connection. The maximum outer diameter of the prepared thrust disks for nuclear power can reach 1080mm. Background technique [0002] Nuclear power is clean and efficient energy, and all countries are vigorously developing nuclear power technology. Among them, the third-generation nuclear power AP1000 is one of the most advanced nuclear power technologies. AP1000 main pump thrust plate preparation is one of the three non-transferable foreign technologies. Its working conditions are harsh (200-400°C, 3-5MPa) and its working cycle is long (60 years). It is one of the most critical components of nuclear power. Therefore, the independent research and development of the preparation technology of the thrust plate for the third-generation nuclear po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K28/02
Inventor 刘国辉车洪艳李雅范秦思贵王铁军李梦启刘慧渊秦斌孙继洲索文旭
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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