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Application of ferrite-based ods steel in service condition of supercritical water

A technology of supercritical water and ferrite, applied in the field of ferrite-based oxide dispersion strengthened steel and its preparation, can solve the problems of material strength and corrosion in the reactor

Active Publication Date: 2021-03-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because supercritical water can be miscible with oxygen in any proportion, it is a non-polar gas with high solubility and high activity. This gas will cause extremely strong corrosion to the materials in the reactor.

Method used

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  • Application of ferrite-based ods steel in service condition of supercritical water
  • Application of ferrite-based ods steel in service condition of supercritical water
  • Application of ferrite-based ods steel in service condition of supercritical water

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The composition of the pre-alloyed powder is Fe-16Cr-3Al-1.5W (wt.%). Combine pre-alloyed powder with nanoscale Y 2 o 3Mix according to the mass ratio of 99.65:0.35, carry out mechanical ball milling on the planetary ball mill, the ball-to-material ratio is 10:1, the ball milling speed is 250r / min, the ball milling time is 40h, adopts argon protection; Ball milled powder is sintered and formed, the mixed powder is sealed in a stainless steel sheath, and then the stainless steel sheath is placed in a hot isostatic pressing furnace, and the air is pumped at 450°C until the inside of the sheath reaches a vacuum state of 0.001Pa, and then in an argon atmosphere The temperature is raised from room temperature 20 degrees Celsius to 1100 degrees Celsius at a heating rate of 10 degrees Celsius / min, sintered at 1100 degrees Celsius and a pressure of 100 MPa for 5 hours, and cooled to room temperature 20 degrees Celsius with the furnace to obtain an ODS steel body with a density...

Embodiment 2

[0034] The composition of the pre-alloyed powder is Fe-16Cr-3Al-1.5W (wt.%). Combine pre-alloyed powder with nanoscale Y 2 o 3 Mix according to the mass ratio of 99.65:0.35, carry out mechanical ball milling on the planetary ball mill, the ball-to-material ratio is 10:1, the ball milling speed is 250r / min, the ball milling time is 40h, adopts argon protection; Ball-milled powder is sintered and formed, the mixed powder is sealed in a stainless steel sheath, and then the stainless steel sheath is placed in a hot isostatic pressing furnace, and the air is pumped at 500°C until the inside of the sheath reaches a vacuum state of 0.005Pa, and then in an argon atmosphere The temperature is raised from room temperature 25 degrees Celsius to 1200 degrees Celsius at a heating rate of 20 degrees Celsius / min, sintered at 1200 degrees Celsius and a pressure of 200 MPa for 1 hour, and cooled to room temperature 25 degrees Celsius with the furnace to obtain an ODS steel body with a density...

Embodiment 3

[0036] The composition of the pre-alloyed powder is Fe-16Cr-3Al-1.5W (wt.%). Combine pre-alloyed powder with nanoscale Y 2 o 3 Mix according to the mass ratio of 99.65:0.35, carry out mechanical ball milling on the planetary ball mill, the ball-to-material ratio is 10:1, the ball milling speed is 250r / min, the ball milling time is 40h, adopts argon protection; Ball milled powder is sintered and formed, the mixed powder is sealed in a stainless steel sheath, and then the stainless steel sheath is placed in a hot isostatic pressing furnace, and the air is pumped at 500°C until the inside of the sheath reaches a vacuum state of 0.003Pa, and then in an argon atmosphere The temperature is raised from room temperature 25 degrees Celsius to 1150 degrees Celsius at a heating rate of 20 degrees Celsius / min, sintered at 1150 degrees Celsius and a pressure of 180 MPa for 3 hours, and cooled to room temperature 25 degrees Celsius with the furnace to obtain an ODS steel body with a densit...

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Abstract

The invention discloses ferrite-based ODS steel under a supercritical water service condition and a preparation method of the ferrite-based ODS steel. Aluminum elements are added into pre-alloyed powder in an atomization powder-making mode through alloy smelting, the aluminum elements are uniformly distributed in a 16Cr-ODS steel matrix in the subsequent mechanical alloying and hot isostatic pressing sintering processes, and a dense oxide film rich in Al and Cr elements is formed on the surface of the ODS steel in supercritical water corrosion environment, so that a sample is effectively prevented from further oxidation, and the service life of the ODS steel in supercritical water is prolonged.

Description

technical field [0001] The invention belongs to the field of ferrite-based oxide dispersion-strengthened steel and its preparation technology, and more specifically relates to a ferrite-based oxide dispersion-strengthened steel with good corrosion resistance in supercritical water and a preparation method thereof. And the characterization and application of its oxide layer structure after long-term corrosion in a supercritical water reactor. Background technique [0002] The supercritical water reactor is the only conceptual reactor type among the six fourth-generation reactors that uses light water as the reactor coolant. Compared with the current water-cooled reactor, the supercritical water reactor has higher thermal efficiency, a simpler system structure, and more High security and better economy and many other advantages. However, because supercritical water can be miscible with oxygen in any proportion, it is a non-polar gas with high solubility and high activity. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/06C22C33/02C22C32/00C21D8/00C21D1/26
CPCC21D1/26C21D8/005C22C32/0026C22C33/0285C22C38/005C22C38/06C22C38/22
Inventor 余黎明任健刘永长李会军马宗青
Owner TIANJIN UNIV