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Method for preparing oxide dispersion strengthened alloy through powder forging

A technology of powder forging and dispersion strengthening

Inactive Publication Date: 2019-01-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation of oxide dispersion strengthened alloy mainly adopts hot isostatic pressing + hot forging of oxygen-containing metal powder to meet the required size requirements. The hot isostatic pressing equipment requires high requirements, long forming cycle and high cost.
When the alloy is kept at high temperature for a long time, the second phase oxide particles are easier to grow and lose the strengthening effect

Method used

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  • Method for preparing oxide dispersion strengthened alloy through powder forging
  • Method for preparing oxide dispersion strengthened alloy through powder forging
  • Method for preparing oxide dispersion strengthened alloy through powder forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Argon atomization of Fe-12Cr-4.5Al-0.5Ti-0.2W-0.5V pre-alloyed powder with particle size 2 o 3 Mix them, put them into a ball mill tank, and fill them with protective gas for ball milling after exhausting the air. The specific parameters of the ball mill are as follows: speed 300r / min, ball-to-material ratio 10:1, ball mill time 40h, to obtain mechanically alloyed powder; fill the above powder Shake it into the low-carbon steel ladle. The size of the sheath is as follows: outer diameter 800mm, wall thickness 3mm, height 100mm, upper and lower cover thickness 10mm, and a small hole with a diameter of 6mm drilled on the top; degassing at 400°C for 4 hours , the vacuum reaches 10 -4Welding and sealing after Pa; forging the sheath as a whole, the initial forging temperature is 1200°C, the final forging temperature is 900°C, and the final deformation is 400%; the sheath is removed by mechanical processing, and the oxide dispersion strengthened alloy rod after hot forging is ...

Embodiment 2

[0046] Argon atomization Fe-16Cr-4.5Al-0.3Ti pre-alloyed powder with particle size 2 o 3 After the powder is mixed, put it into a ball mill jar, ball mill it under the protection of high-purity Ar gas, and seal it by welding. The size of the sheath is as follows: outer diameter 800mm, wall thickness 3mm, height 100mm, upper and lower covers both 10mm thick, and a small hole with a diameter of 8mm drilled on the top; the sheath is forged as a whole, the initial forging temperature is 1200°C, and the final forging temperature is 1000°C , Hot forging with a large amount of deformation, the final diameter is 23mm. Then the forging billet with sheath was kept at 1000°C for 1 hour for homogenization treatment. The sheath was removed by mechanical processing to obtain an oxide dispersion strengthened alloy rod with a diameter of 20 mm. After the powder forging alloy billet was processed by rolling, the microstructure of the alloy was observed. figure 2 (a) is the alloy structure p...

Embodiment 3

[0048] The Fe-16Cr-3Al-0.5Ti-2W-0.5V-0.5Y pre-alloyed powder with a particle size of -3 Pa, the heating time is 2h, then oxidation treatment is carried out under the conditions of 20Pa pure oxygen and 300°C, and then put into the sheath for welding and sealing; the sheath is forged as a whole, the initial forging temperature is 1150°C, the final forging temperature is 1050°C, and finally forged to The diameter is 23mm, and the sheath is removed by mechanical processing to obtain an oxide dispersion strengthened alloy rod with a diameter of 20mm. The alloy rod is prepared by swaging, and the alloy processed by hot isostatic pressing + hot forging + swaging Bars are compared to get image 3 Hardness comparison shown. The hardness of powder forging and hot isostatic pressing alloys is equivalent and higher than that of as-cast alloys, indicating that the second phase strengthening plays a role.

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Abstract

The invention aims at providing a preparation method for oxide dispersion strengthened alloy with the advantages that the process is simple; the efficiency is high; the product performance is excellent and stable. The method has the concretely steps of performing pretreatment on alloy powder; charging the alloy powder subjected to pretreatment into a low-carbon steel coating sleeve; after vacuum pumping degassing, performing welding sealing; performing alloy heat curing directly by using a powder forging process; after the coating sleeve is removed, obtaining the oxide dispersion strengthenedalloy with good performance. The alloy has the uniform tissue; fine second phase particles are dispersed and distributed. The alloy pretreatment method comprises the following steps of mixing iron-based or nickel-based pre-alloy powder and 0.1 to 1.0 weight percent of Y2O3 powder; performing mechanical ball milling to obtain yttrium-containing alloy powder; or performing treatment by an inner oxidization method to obtain the yttrium-containing alloy powder. The method directly uses powder forging so that the oxide dispersion strengthened alloy is directly shaped to obtain the oxide dispersionstrengthened alloy with high intensity and good plasticity; the preparation efficiency is greatly improved; the work cost is reduced.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular provides a powder forging forming method of an oxide dispersion strengthened alloy. Background technique [0002] Oxide dispersion strengthened alloy has excellent room temperature and high temperature strength, superior radiation resistance, low swelling, high temperature creep, oxidation resistance and corrosion resistance, can be used in thermal power generation materials and engine combustion chamber materials, and is the first wall and Candidate materials for advanced fission reactor cladding. [0003] The main reason for the excellent performance of oxide dispersion strengthened alloys is that the second phases such as Y-Al-O and Y-Ti-O, which are uniformly dispersed in the matrix, precipitate out of the second phase, and act as strengthening particles to pin grain boundaries and dislocations. , and act as the tail of the defect to attract the nucleation of helium bubbles...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C33/02B22F3/17
CPCB22F3/17B22F2003/175C22C1/05C22C33/02
Inventor 李静吴飒建刘实葛鹏熊良银
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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