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A Method for Improving the Corrosion Resistance of Tellurium of UNS N10003 Alloy

A technology for corrosion properties and alloys, which is applied in the field of improving the tellurium corrosion resistance of UNSN10003 alloys, can solve the problems of not being able to meet the corrosion resistance properties at the same time, deteriorate the molten salt corrosion resistance, and increase the cost of fuel salts, so as to improve the tellurium corrosion resistance, The effect of improving tellurium corrosion resistance and improving safety and reliability

Active Publication Date: 2019-11-22
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After increasing the content of chromium, although the corrosion resistance of tellurium can be improved, the corrosion resistance of molten salt is deteriorated.
Therefore, by adjusting the content of chromium, it is impossible to meet the requirements of the two corrosion resistance properties at the same time.
On the other hand, increasing the ratio of trivalent uranium to tetravalent uranium in fuel salt and adjusting the redox potential of fuel salt can also improve the corrosion of tellurium, but this adjustment will increase the cost of fuel salt and change the original maturity. physical design of

Method used

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  • A Method for Improving the Corrosion Resistance of Tellurium of UNS N10003 Alloy
  • A Method for Improving the Corrosion Resistance of Tellurium of UNS N10003 Alloy
  • A Method for Improving the Corrosion Resistance of Tellurium of UNS N10003 Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Verification of tellurium corrosion resistance of hot-rolled UNS N10003 alloy rods.

[0027] The chemical composition of the hot-rolled UNS N10003 alloy bar in this example is shown in Table 1.

[0028] Table 1, UNS N10003 alloy composition (wt.%)

[0029] Ni Mo Cr Fe mn Si Example 1 Bal. 16.10 6.91 4.03 0.531 0.319 Example 2 Bal. 16.11 6.88 4.01 0.530 0.0562 C co Cu W Ti Al Example 1 0.0483 0.0293 0.0036 0.0458 0.0054 0.0708 Example 2 0.0572 0.0293 0.0037 0.0462 0.0054 0.0794

[0030] The alloy is melted and cast into a Φ508mm ingot through vacuum induction melting and vacuum self-consumption melting, and then homogenized and annealed at 1180°C for 2.5h, and then hot rolled into a Φ16mm bar.

[0031] Tellurium and hot-rolled UNS N10003 alloy bar samples (without solution heat treatment) and standard UNS N10003 alloy samples (with solution heat treatment) were sealed in a va...

Embodiment 2

[0035] Example 2: Verification of tellurium corrosion resistance of standard solid solution state UNS N10003 alloy plate after hot rolling.

[0036] Put the 10mm thick standard solid solution state UNS N10003 alloy plate (see Table 1 for composition) into 1200℃ for 0.5h, take it out and roll it into a 6mm thick plate, put it in 1200℃ again for 0.5h, take it out and roll it into a 3mm thick plate Hot-rolled deformed sheet.

[0037] Tellurium and hot-rolled UNS N10003 alloy plate samples and standard UNS N10003 alloy samples were sealed in a vacuumed quartz tube to eliminate the influence of oxygen on the tellurium element and alloy samples. In order to ensure the vacuum effect in the quartz tube, the quartz tube containing the sample is washed with high-purity argon gas (99.999% pure) after vacuuming to ensure that the oxygen content in the quartz tube reaches the minimum, and then the vacuum is used. Sealing equipment-quartz glass tube rotary sealing machine seals the quartz ...

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Abstract

The invention discloses a method for improving tellurium corrosion resistance of an UNS N10003 alloy. The UNS N10003 alloy comprises the following components, by mass, 6%-8% of Cr, 15%-17% of Mo, lessthan or equal to 5% of Fe, less than or equal to 1% of Si, less than or equal to 0.8% of Mn, less than or equal to 0.08% of C, less than or equal to 0.2% of Co, less than or equal to 0.35% of Cu, less than or equal to 0.5% of W, less than or equal to 0.35% of Al + Ti, and the balance Ni and inevitable impurity elements; and the method specifically enables a high-temperature-resistant molten saltcorrosion alloy to be in a variant form; the invention further discloses application of the variant-form UNS N10003 alloy in tellurium corrosion resistance. According to the method, the good anti-tellurium corrosion resistance of the variable-form UNS N10003 alloy is found for the first time, the method for improving the tellurium corrosion resistance of the UNS N10003 alloy is provided based on the finding, and the anti-tellurium corrosion resistance of the UNS N10003 alloy can be greatly improved in the lowest realizing cost.

Description

technical field [0001] The invention relates to a method for improving the tellurium corrosion resistance of UNS N10003 alloy. 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 of the grain boundaries, making the grain boundaries prone to cracking. The depth of diffusion of...

Claims

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Application Information

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