Method for improving the corrosion resistance of nickel-based superalloys against tellurium and nickel-based superalloys

A technology for nickel-based superalloys and corrosion performance, applied in the field of nickel-based superalloys to improve the corrosion resistance of tellurium, to achieve the effect of weakening surface cracking, good economic benefits, and overcoming serious short plates

Active Publication Date: 2020-10-30
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a method for improving the corrosion resistance of nickel-based superalloys against tellurium. Corrosion Resistance of Tellurium Alloys

Method used

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  • Method for improving the corrosion resistance of nickel-based superalloys against tellurium and nickel-based superalloys
  • Method for improving the corrosion resistance of nickel-based superalloys against tellurium and nickel-based superalloys
  • Method for improving the corrosion resistance of nickel-based superalloys against tellurium and nickel-based superalloys

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Embodiment 1

[0033] Embodiment 1: Mn content is 1.02wt.% (table 1), and the depth of intergranular diffusion of tellurium is 46 μ m ( Figure 1b ), the depth of intergranular cracking is consistent with the above-mentioned diffusion depth ( Figure 2b ), tensile strength 682MPa, yield strength 388MPa, elongation at break 47%.

Embodiment 2

[0034] Embodiment 2: Mn content is 2.11wt.% (table 1), and the depth of intergranular diffusion of tellurium is 36 μ m ( Figure 1c ), the depth of intergranular cracking is consistent with the above-mentioned diffusion depth ( Figure 2c ), tensile strength 698MPa, yield strength 387MPa, elongation at break 48%.

Embodiment 3

[0035] Embodiment 3: Mn content is 3.23wt.% (table 1), and the depth of intergranular diffusion of tellurium is 32 μ m ( Figure 1d ), the depth of intergranular cracking is consistent with the above-mentioned diffusion depth ( Figure 2d ), tensile strength 817MPa, yield strength 391MPa, elongation at break 54%.

[0036]Comparing the data of the standard alloy and the above examples, it can be seen that as the Mn content increases to 1wt.%, the intergranular diffusion depth of tellurium decreases significantly and further decreases with the increase of Mn content. Correspondingly, the depth of cracking on the alloy surface also shows the same trend. Tensile mechanics tests show that after increasing the Mn content, the tensile strength and yield strength are significantly improved with the relief of surface corrosion and cracking. In summary, based on the composition of standard nickel-based superalloys, the alloy exhibits excellent resistance to tellurium corrosion after t...

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Abstract

The invention discloses a tellurium corrosion resistance improvement method for nickel-based high-temperature alloy and belongs to the technical field of alloy. According to the tellurium corrosion resistance improvement method, the components of standard nickel-based high-temperature alloy are regulated; namely the content of Mn is increased to be higher than 1wt%; and the content of impurities or the content of Ni is correspondingly reduced. The tellurium corrosion resistance improvement method disclosed by the invention can remarkably restrain the diffusion depth of tellurium crystal and can weaken the degree of surface cracking caused by tellurium corrosion so as to obtain better mechanical properties, thereby effectively overcoming the serious shortcoming of an existing nickel-based high-temperature alloy material in tellurium corrosion resistance; more than that, the tellurium corrosion resistance improvement method disclosed by the invention realizes fine adjustment of the components of the existing nickel-based high-temperature alloy, does not need to change the existing alloy raw materials and preparation process, does not increase any cost, achieves good economical benefits and especially has great significance to an application environment such as a fused salt reactor which takes high-temperature fused salt as a heat conducting medium.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for improving the tellurium corrosion resistance of a nickel-based superalloy and the nickel-based superalloy. Background technique [0002] Tellurium, a fission product, is formed during the service of molten salt reactors and sodium-cooled fast reactors. These tellurium elements diffuse into nickel-based superalloy heat exchange tubes and stainless steel fuel cladding through intergranular diffusion at high temperatures, resulting in intergranular cracking on the surface of the above components, which seriously threatens the service safety of the reactor. [0003] Tellurium corrosion in the reactor is mainly manifested in two aspects: surface telluride and tellurium segregation at grain boundaries, the latter being the main manifestation of tellurium corrosion hazards. The segregation of tellurium elements at the grain boundaries will weaken the bonding force ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/057C22F1/10
Inventor 蒋力李志军吴博恒王伟
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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