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SPS diffusion welding method for DD98 congeneric nickel-based mono-crystalline high-temperature alloy

A nickel-based single crystal, high temperature alloy technology, applied in welding equipment, non-electric welding equipment, metal processing equipment and other directions, can solve problems such as poor weldability

Active Publication Date: 2021-07-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single crystal superalloys have poor weldability due to the addition of a large number of alloying elements

Method used

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  • SPS diffusion welding method for DD98 congeneric nickel-based mono-crystalline high-temperature alloy
  • SPS diffusion welding method for DD98 congeneric nickel-based mono-crystalline high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, the present embodiment provides a SPS diffusion welding method of the same nickel-based single crystal superalloy of DD98, comprising the following steps:

[0027] (1) Surface treatment is carried out on DD98 nickel-based single crystal superalloy respectively. DD98 nickel-based single crystal superalloy includes the first DD98 nickel-based single crystal superalloy 1 and the second DD98 nickel-based single crystal superalloy 3; surface treatment The process is as follows: put two pieces of DD98 nickel-based single crystal superalloy in acetone and ultrasonically clean them to remove oil stains on the surface and dry them, then polish DD98 with 320#, 600#, 800#, 1000#, 1500# SiC sandpaper in sequence The surface of the nickel-based single crystal superalloy to be welded is then polished with a 3 μm diamond polishing agent, and finally the polished DD98 nickel-based single crystal superalloy is ultrasonically cleaned and dried in alcohol.

[0028...

Embodiment 2 and 3

[0031] A method of SPS diffusion welding of the same nickel-based single crystal superalloy of DD98. The steps of the method are repeated in Example 1 to obtain Examples 2 and 3. The difference is that the joining temperature of 950°C is replaced by 980°C and 1000°C respectively, and finally Complete the SPS solid phase diffusion connection between DD98 nickel-based single crystal superalloys.

[0032] like figure 2 As shown, the method of embodiment 3 is used to connect two DD98 same nickel-based single crystal superalloys, and after spark plasma sintering is completed, the overall microstructure of the joint formed;

[0033] The performance testing of the shear strength of the DD98 nickel-based single crystal superalloy joints finally prepared in Examples 1 to 3 was performed at room temperature, and the results of the room temperature shear strength of the joints obtained in Examples 1 to 3 are shown in Table 1 .

[0034] Table 1 Shear strength of DD98 nickel-based single ...

Embodiment 4-6

[0037] A SPS diffusion welding method of the same nickel-based single crystal superalloy of DD98, the method steps are repeated in Example 3 to obtain Examples 4 and 5, the difference is that the time for holding the temperature at 1000°C is replaced by 0 min and 3min, the SPS solid phase diffusion connection between DD98 nickel-based single crystal superalloys is finally completed. The method steps of embodiment 6 are different from those of embodiment 3 in that the connection temperature is 1040° C. and the holding time is 10 min.

[0038] The performance test of the shear strength of the DD98 nickel-based single crystal superalloy joint finally prepared in Examples 4-6 was performed at room temperature, and the measured room temperature shear strength results are shown in Table 2, compared with Example 3.

[0039] Table 2 Average shear strength of DD98 Ni-based single crystal superalloy obtained under different holding times

[0040] detection group Holding tim...

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Abstract

The invention discloses an SPS diffusion welding method for DD98 congeneric nickel-based mono-crystalline high-temperature alloy. A Ni-Cr-W-B-Si-Fe powder solder is used as a middle transition layer, and effective connection of the DD98 congeneric nickel-based mono-crystalline high-temperature alloy is achieved at low temperature within short time through the spark plasma sintering technology. Through the welding method, it can be ensured that a base metal is not crystallized, stable and reliable joints with refined welding line crystalline grains and uniformly dispersed connecting faces are obtained, and the room-temperature shear strength of the joints can reach 301 MPa.

Description

technical field [0001] The invention belongs to the technical field of alloy welding, and in particular relates to a SPS diffusion welding method of DD98 same nickel-based single crystal superalloy. Background technique [0002] DD98 is a Ni-Cr-Co-Mo-W-Al-Ta series Ni-Cr-Co-Mo-W-Al-Ta series Ni-Cr-Co-Mo-W-Al-Ta superalloy with no Re, high temperature resistance, low cost and low cost. The mass fraction of each component is: Cr 6%, Co 5 %, W 6%, Mo 2%, Al 6.3%, Ti1%, Ta 6%, Ni balance. The single crystal material eliminates the transverse grain boundary perpendicular to the principal stress axis, and has the smallest mechanical dispersion performance. Its superior oxidation resistance, thermal fatigue performance and creep performance can meet the conditions of heavy load, high temperature and complex stress under harsh conditions. , widely used in the preparation of hot-end parts such as turbine blades of aero-engines. Single crystal superalloys have poor weldability due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/02B23K20/24B23K20/26
CPCB23K20/24B23K20/023B23K20/002B23K20/026B23K20/26
Inventor 贺艳明郑思路徐海涛陈刚强杨建国周正强石磊刘玉章李华鑫闾川阳郑文健马英鹤孙元
Owner ZHEJIANG UNIV OF TECH
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