Micro alloyed oxide dispersion-strengthening ferrite steel and preparation method

A ferritic steel and micro-alloying technology, which is applied in the field of metal material preparation, oxide dispersion strengthened ferritic steel and preparation, can solve the problems of poor process controllability, low production efficiency, easy introduction of pollution, etc. Preparation cost, convenient operation, and the effect of improving high temperature mechanical properties

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

AI Technical Summary

Problems solved by technology

The oxide dispersion strengthened ferritic steel obtained by mechanical alloying powder, hot extrusion or hot isostatic pressing consolidation molding usually has low toughness, and the mechanical alloying powder making process is time-consuming, low production efficiency, and easy Introduce pollution, poor process controllability

Method used

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  • Micro alloyed oxide dispersion-strengthening ferrite steel and preparation method
  • Micro alloyed oxide dispersion-strengthening ferrite steel and preparation method
  • Micro alloyed oxide dispersion-strengthening ferrite steel and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of Ball Milling Powder

[0038] According to the designed component distribution ratio, the average particle size is -325 mesh YH 2 Powder, average particle size -325 mesh TiH 2 Powder, Fe with an average particle size of 50nm 2 o 3The powder is mixed with the Fe-14Cr-3W alloy powder with a particle size of -200 mesh prepared by the argon gas atomization method. Under the protective atmosphere of argon gas with a purity of 99.99%, a planetary ball mill is used, and the ball milling speed is 350r / min; the time is 24h; the ratio of ball to material is 8:1 mechanical ball milling to obtain ball milling powder; wherein the weight percentage of each component is: YH 2 0.4wt.%, TiH 2 0.4wt.%, Fe 2 o 3 0.3wt.%, Cu 1%, the balance is Fe-14Cr-3W;

[0039] Step 2: Thermal Consolidation Forming

[0040] Put the ball mill powder in the first step into the ladle, degas, seal and weld, and carry out hot extrusion molding at 1150°C, the extrusion ratio i...

Embodiment 2

[0045] Step 1: Preparation of Ball Milling Powder

[0046] According to the designed component distribution ratio, the average particle size is -200 mesh YH 2 Powder, average particle size -200 mesh TiH 2 Powder, Fe with an average particle size of 70nm 2 o 3 The powder is mixed with the Fe-15Cr-2W alloy powder with a particle size of -300 mesh prepared by the argon gas atomization method. Under the protective atmosphere of argon gas with a purity of 99.99%, a planetary ball mill is used, and the ball milling speed is 250r / min; the time is 48h; the ratio of ball to material is 7:1 mechanical ball milling to obtain ball milling powder; wherein the weight percentage of each component is: YH 2 0.3wt.%, TiH 2 0.3wt.%, Fe 2 o 3 0.2wt.%, Cu 2%, the balance is Fe-15Cr-2W;

[0047] Step 2: Thermal Consolidation Forming

[0048] Put the ball mill powder in the first step into the ladle, degas, seal and weld, and carry out hot extrusion molding at 1100°C, the extrusion ratio ...

Embodiment 3

[0053] Step 1: Preparation of Ball Milling Powder

[0054] According to the designed component distribution ratio, the average particle size is -250 mesh YH 2 Powder, average particle size -250 mesh TiH 2 Powder, Fe with an average particle size of 100nm 2 o 3 The powder is mixed with the Fe-16Cr-1W alloy powder with a particle size of -250 mesh prepared by the argon gas atomization method. Under the protective atmosphere of argon gas with a purity of 99.99%, a planetary ball mill is used, and the ball milling speed is 300r / min; the time is 36h; the ball-to-material ratio is 6:1 mechanical ball milling to obtain ball milling powder; wherein the weight percentage of each component is: YH 2 0.6wt.%, TiH 2 1.0wt.%, Fe 2 o 3 0.5wt.%, Cu 3wt.%, the balance is Fe-16Cr-1W;

[0055] Step 2: Thermal Consolidation Forming

[0056] Put the ball mill powder in the first step into the ladle, degas, seal and weld, and carry out hot extrusion molding at 1050°C, the extrusion ratio...

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Abstract

The invention relates to a micro alloyed oxide dispersion-strengthening ferrite steel, wherein the chemical formula of the steel is Fe-(14-16)Cr-(1-3)W-(0.3-1.0)Ti-(0.3-0.6)Y2O3-(0.5-3)Cu. The preparation method of the steel comprises the following steps of: thermosetting and moulding after mixing and ball milling Fe-Cr-W, Ti, Y2O3 and Cu in proportion, or thermosetting and moulding after mixing ball milling powder and Fe-Cr-W alloy powder in the ratio of 1: (2-4), and then carrying out solution treatment or solution and ageing treatment, thus micro Cu alloyed oxide dispersion-strengthening ferrite steel is obtained. In the invention, Cu is introduced into a matrix lattice by mechanical alloying; nano-scale copper-rich second phase is precipitated from a matrix in the thermosetting, moulding and heat treatment process; and the strength and high-temperature creep resistance of alloy are greatly improved. The invention has the advantages of simple preparation process, short preparation period, low preparation cost and low impurity content, and is easy to operate. The prepared alloy has good room-temperature and high-temperature mechanical properties and is applicable to industrial production.

Description

technical field [0001] The invention relates to the technical field of oxide dispersion strengthened ferrite steel with excellent high temperature performance and its preparation. In particular, it refers to a micro-alloyed oxide dispersion-strengthened ferritic steel and its preparation method; by adding Cu micro-alloyed to the original oxide dispersion-strengthened ferritic steel material, solid solution aging precipitates nano-Cu-rich particles to improve the comprehensiveness of the alloy mechanical properties. The invention belongs to the technical field of metal material preparation. Background technique [0002] With the country's "Twelfth Five-Year Plan" strategic plan for the new energy field, the nuclear energy industry will enter a period of rapid development. Oxide dispersion strengthened ferritic steel will be used as the first wall of nuclear reactors due to its superior radiation resistance and low swelling performance. The optimal candidate material for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/02
Inventor 刘咏刘锋窦玉海赵大鹏
Owner CENT SOUTH UNIV
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