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Preparation method of oxide dispersion strengthened FeCrAl alloy pipe

A technology of dispersion strengthening and oxide, which is applied in the field of preparation of oxide dispersion strengthening FeCrAl alloy pipes, can solve the problems of restricting the development of nuclear power industry and relying on imports, and achieve excellent mechanical and creep resistance properties, short processing period, excellent anti-corrosion The effect of oxidation

Inactive Publication Date: 2019-04-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research and development and preparation of ODS-FeCrAl alloy in my country started relatively late, and most of the nuclear power equipment and materials used were imported, and the backwardness of materials seriously restricted the development of my country's nuclear power industry.

Method used

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  • Preparation method of oxide dispersion strengthened FeCrAl alloy pipe
  • Preparation method of oxide dispersion strengthened FeCrAl alloy pipe
  • Preparation method of oxide dispersion strengthened FeCrAl alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using QX-QM20 high-energy ball mill to mechanically mill FeCrAl and Y 2 o 3 powder, and thermally consolidated by hot isostatic pressing to obtain a chemical composition of Fe-13Cr-4.0Al-0.3Ti-0.2V-2.0W-0.1Si-0.5Y-0.16%O (mass percentage, the same below) ODS-FeCrAl alloy. The alloy is forged into a Ф26mm round bar at 1150°C, and the surface defects are removed after turning, and the roughness of the billet is increased by proper grinding. Then perforate after heat treatment at 800°C / 60min to obtain a Ф24×5mm tube blank. A three-roll rolling mill is used to cold-roll the perforated tube billet. With the increase of passes, the annealing system is increased from 800°C / 1h to 1000°C / 1h, and the deformation of each pass is increased from 20% to 40%. The final rolling Cheng Ru figure 1 The shown Ф9.5×0.3mm tube. The rolling process parameters refer to Table 1. The mechanical properties at room temperature show that the yield strength of the ODS-FeCrAl alloy pipe produce...

Embodiment 2

[0027] Mechanical ball milling of FeCrAl and Y using a high energy ball mill 2 o 3 powder, and extruded by a hot extrusion process to obtain an ODS-FeCrAl alloy with a chemical composition of Fe-16Cr-5.0Al-0.25Ti-0.25Zr-0.1Si-0.3Y-0.13O. The alloy is forged into a Ф24.5mm round bar at 1200°C, the surface defects are removed after turning, and then pierced after heat treatment at 700°C / 60min to obtain a Ф22×5mm tube blank. The perforated tube billet is cold-rolled by a three-roll mill. During the cold-rolling process, the annealing temperature increases from 700°C to 950°C, the holding time remains unchanged, and the deformation of each pass increases from 15% to 35%. The ODS-FeCrAl pipe because of the figure 2 The nano-oxide reinforced phase shown in the dispersion distribution has excellent mechanical properties: the tensile strength at room temperature reaches 1180 MPa, the yield strength at room temperature reaches 1100 MPa, and the elongation is 12%.

[0028] Table 2 e...

Embodiment 3

[0031] Mechanical ball milling of FeCrAl and Y using a high energy ball mill 2 o 3 powder, and thermally consolidated by hot isostatic pressing to obtain an ODS-FeCrAl alloy with a chemical composition of Fe-10Cr-4.5Al-0.2Ti-0.3Zr-1.5W-0.5Y-0.19O. The alloy is forged at 1150°C into a Ф25mm round bar, the surface defects are removed after turning, and then perforated after heat treatment at 800°C / 60min to obtain a Ф24×5mm tube blank. The perforated tube billet is cold-rolled with a three-roll mill, the annealing temperature is raised from 800°C to 1000°C, and the amount of deformation per pass is increased from 25% to 40%, and the final rolling is as follows: image 3The shown Ф10×0.5mm tube. A mechanical test was carried out on it, and the yield strength at room temperature was 1007MPa, the tensile strength was 1142MPa, and the elongation was 13.5%.

[0032] Table 3 embodiment 3 rolling process parameters

[0033]

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Abstract

The invention provides a preparation method of an oxide dispersion strengthened FeCrAl alloy pipe, belongs to the technical field of nuclear power pipe preparation, particularly discloses a preparation method of an ODS (oxide dispersion strengthened) FeCrAl alloy pipe for a nuclear fuel canning material, and aims to realize localization of a high-strength ODS-FeCrAl alloy thin-walled pipe. The preparation method of the ODS FeCrAl alloy pipe adopts a cold rolling and pass thermal treatment process, and is characterized in that the rolling speed is controlled to 100-600 r / min, and the pipe deformation is controlled to 0%-50%. Each pass of thermal treatment mode adopts a vacuum annealing mode, the annealing temperature is 700-1150 DEG C, and the heat insulation time is 30-90 minutes. The preparation method does not influence the granular size and the dispersion state of a Y-Al-O oxide strengthening phase in the ODS FeCrAl alloy, the prepared pipe is of fine-crystalline-grain and uniform-texture crystal structure, and the ODS pipe has excellent strength and creep resistance and high oxidation resistance and irradiation swelling performance.

Description

technical field [0001] The invention belongs to the technical field of nuclear power pipe material preparation, and in particular relates to a method for preparing an oxide dispersion strengthened (Oxide Dispersion Strengthened, ODS) FeCrAl alloy pipe material for nuclear fuel cladding materials. Background technique [0002] In 2011, the nuclear power safety crisis caused by the tsunami at the Fukushima nuclear power plant in Japan raised the global awareness of nuclear power safety to an unprecedented level, and the research and development of accident-tolerant fuel came into being. Accident-tolerant fuels are designed to withstand severe accident conditions for an extended period of time while maintaining performance under normal operating conditions comparable to or better than existing fuel systems. Oxide Dispersion Strengthened (ODS) FeCrAl alloy has become one of the candidate materials for accident-tolerant fuel cladding due to its excellent creep resistance, oxidati...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/22C22C38/24C22C38/28C21D8/10C22C33/02
CPCC21D8/105C22C32/0026C22C33/0285C22C38/005C22C38/02C22C38/06C22C38/22C22C38/24C22C38/28
Inventor 李静杨英刘实吴飒建熊良银翟剑晗刘彤葛鹏李明群
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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