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Oxide dispersion-strengthening ferrite steel with bicrystal structure and production method thereof

A ferritic steel and dispersion strengthening technology, which is applied in the field of metal material preparation and oxide dispersion strengthened ferritic steel preparation, can solve the problem that the process of abnormal grain growth is difficult to control, affects the processing performance of the alloy, and the uneven twin crystal structure etc. to achieve superior toughness, increase production, and balance strength and toughness

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The oxide dispersion strengthened ferritic steel obtained by mechanical alloying, hot extrusion or hot isostatic pressing consolidation molding usually has low toughness, and the uniform elongation at room temperature is less than 5%, which will affect the follow-up of the alloy. Processing performance, and accidental fracture failure during service
However, the twin crystal structure obtained by this method is extremely inhomogeneous, and the abnormal grain growth process is not easy to control

Method used

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  • Oxide dispersion-strengthening ferrite steel with bicrystal structure and production method thereof
  • Oxide dispersion-strengthening ferrite steel with bicrystal structure and production method thereof
  • Oxide dispersion-strengthening ferrite steel with bicrystal structure and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Fe-14Cr-3W master alloy was made by induction melting the master alloy of Fe, Cr and W twice in a high-frequency vacuum induction furnace, and Fe-Cr-W pre-alloyed powder was prepared by inert gas atomization. Addition of 0.3wt% TiH to Fe-Cr-W pre-alloyed powder 2 , 0.3wt% YH 2 , 0.2wt% Fe 2 o 3 , Fe-Cr-W pre-alloyed powder particle size is -200 mesh, TiH 2 and YH 2 The particle size of the powder is -325 mesh, Fe 2 o 3 The average particle size is 30nm. Mechanical ball milling is carried out in a planetary ball mill under an argon protective atmosphere. The ball milling time is 24 hours, the rotation speed is 350r / min, and the ball-to-material ratio is 6:1 to obtain ball mill powder. Mix Fe-Cr-W pre-alloyed powder and ball mill powder uniformly according to the ratio of 3:1, put the mixed powder into a ladle, degas, seal and weld, then carry out hot sheath forging and consolidation molding at 1000°C, and then Anneal at 1000°C for 1 hour, then air cool. An alloy ...

Embodiment 2

[0036] Compared to Example 1, adding 0.7wt% TiH 2 , 0.5 wt% YH 2 , 0.4 wt% Fe 2 o 3 , the balance is Fe-Cr-W powder for ball milling, the ball milling time is 48h, the rotation speed is 250r / min, and the ball-to-material ratio is 7:1. Mix Fe-Cr-W pre-alloyed powder and ball mill powder uniformly according to the ratio of 2:1, put the mixed powder into a ladle, degas, seal and weld, then carry out hot sheath forging consolidation molding at 900°C, Anneal at 1100°C for 1 hour, then air cool. There is no obvious difference in the microstructure characteristics of the alloys, the proportion of fine-grained regions increases, and the grain size of the alloys increases slightly. The tensile strength of the alloy at room temperature is 1172.6MPa, and the elongation is 11.32%.

Embodiment 3

[0038] Compared to Example 1, adding 1.0wt% TiH 2 , 0.6 wt% YH 2 , 0.5 wt% Fe 2 0 3 , the balance is Fe-Cr-W powder for ball milling, the ball milling time is 36h, the rotation speed is 300r / min, and the ball-to-material ratio is 8:1. Mix Fe-Cr-W pre-alloyed powder and ball mill powder uniformly in a ratio of 4:1, put the mixed powder into a ladle, degas, seal and weld, and then carry out hot sheath forging and consolidation molding at 1100°C. Anneal at 1200°C for 1h, then air cool. . The room temperature tensile strength of the alloy is 1103.3MPa, and the elongation is 13.8%.

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Abstract

The invention relates to oxide dispersion-strengthening ferrite steel with a bicrystal structure, compirisng the following components of Cr, W, Ti, Y2O3 and the balance of Fe. A preparation method of the oxide dispersion-strengthening ferrite steel with the bicrystal structure comprises the following steps of: uniformly mixing Fe-Cr-W prealloy powder and ball milled powder according to a certain proportion; placing the mixed powder into a steel capsule for degassing and seal welding; then thermally canned-forging, solidifying and molding; and carrying out thermal treatment. The ferrite steel with excellent mechanical property at room temperature and high temperature can be produced through mixing powders in different proportions and controlling on solidifying and molding as well as the following thermal treatment. Oxide dispersion-strengthening alloy produced by the invention has the characteristic of the bicrystal structure, and the structure can simultaneously give the alloy higher strength and excellent toughness. The efficiency for producing the oxide dispersion-strengthening ferrite steel can be increased effectively, the process cost can be greatly saved, and the oxide dispersion-strengthening ferrite steel is beneficial to industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of oxide dispersion strengthened ferritic steel with excellent high temperature performance. In particular, it provides a double-crystal oxide dispersion-strengthened ferrite steel and a preparation method thereof, which belong to the technical field of metal material preparation. Background technique [0002] Due to its superior radiation resistance, low swelling and high temperature creep properties, oxide dispersion strengthened ferritic steel can be used as cladding tube materials for fast neutron breeder reactors, first wall materials for nuclear fusion reactors, thermal power generation materials and engine combustion materials. room material. Its microstructure features are mainly nanoscale ultrafine crystals, 2-3nm Y-Ti-O clusters in the matrix and several to tens of nanometers of Y 2 Ti 2 o 7 , Y 2 TiO 5 And other oxides are used as dispersion strengthening particles to pin the ...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C33/02
Inventor 刘咏刘锋赵大鹏窦玉海张刘杰
Owner CENT SOUTH UNIV
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