Preparation method for 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, short processing period and excellent strength and the effect of creep resistance

Active Publication Date: 2019-07-12
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 for oxide dispersion strengthened FeCrAl alloy pipe
  • Preparation method for oxide dispersion strengthened FeCrAl alloy pipe
  • Preparation method for oxide dispersion strengthened FeCrAl alloy pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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 an ODS-FeCrAl alloy with a chemical composition of Fe-14Cr-3.0Al-1.0W-0.1Si-0.5Y (mass percentage, the same below). 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 produced in this e...

Embodiment 2

[0026] Mechanical ball milling of FeCrAl and Y using a high energy ball mill 2 o 3 powder, and extruded by hot isostatic pressing process to obtain ODS-FeCrAl alloy with chemical composition Fe-20Cr-5.0Al-0.25Ti-0.3Y. 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%.

[0027] Table 2 embodiment 2 rolling ...

Embodiment 3

[0030] 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-16Cr-5Al-0.3Ti-2W-0.15Y. 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 3 The shown Ф10×0.5mm tube. A mechanical test was carried out on it, and the yield strength at room temperature was 987MPa, the tensile strength was 1013MPa, and the elongation was 14%.

[0031] Table 3 embodiment 3 rolling process parameters

[0032]

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Abstract

The invention belongs to the technical field of nuclear power pipe preparation, and particularly discloses a preparation method for an oxide dispersion strengthened (ODS) FeCrAl alloy pipe for nuclearfuel cladding materials; and the invention aims to achieve localization of high-strength ODS-FeCrAl alloy thin-walled pipes. A cold rolling and pass heat treatment process is adopted for preparationof the ODS-FeCrAl alloy pipe; the preparation method is characterized in that the rolling speed is controlled within 100-600 rpm, and the deformation of the pipe is controlled within 10%-50%. The heattreatment for each pass adopts a vacuum annealing mode; and the annealing temperature is 700 DEG C-1050 DEG C, and the holding time is 30-90 min. According to the preparation method for the pipe, theparticle size and dispersion state of Y-Al-O oxide strengthened phases in the ODS-FeCrAl alloy are not affected, and the prepared pipe is of the crystal structure with small grains and homogeneous microstructure; and the ODS pipe is high in strength and creep resistance as well as high in resistance to oxidation and irradiation swelling.

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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Patent Type & Authority Applications(China)
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建晗刘彤葛鹏李明群
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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