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A method for preparing multi-nanophase-strengthened ferritic alloys with complex shapes

A technology of complex shape and ferrite, which is applied in the field of preparing multi-nanometer phase-strengthened ferrite alloys with complex shapes, can solve the problems of reducing the high-temperature mechanical properties of materials, inclusions of ball-milling medium materials, and increasing the oxygen content of alloys, etc. The effect of strong design, low cost and simple process

Active Publication Date: 2021-06-29
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing oxide dispersion-strengthened ferrite-based alloys by mechanical alloying process, metal elements such as Fe, Cr, and Al are easily oxidized in the process of mechanical alloying, which increases the oxygen content of the alloy and reduces its performance.
At the same time, long-term ball milling is easy to introduce inclusions of ball milling medium materials, which will reduce the high temperature mechanical properties of materials
Finally, the powder obtained by mechanical alloying is severely work-hardened, and most of them are irregularly shaped powders with poor powder fluidity. Only some special methods can be used, such as jacketed hot extrusion, jacketed hot isostatic pressing or spark plasma sintering. Can not meet the powder requirements of laser cladding forming technology

Method used

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  • A method for preparing multi-nanophase-strengthened ferritic alloys with complex shapes
  • A method for preparing multi-nanophase-strengthened ferritic alloys with complex shapes
  • A method for preparing multi-nanophase-strengthened ferritic alloys with complex shapes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Composition Fe-10wt.%Cr-5wt.%Ni-2wt.%Al-2.3wt.%Ti-0.5wt.%Y 2 o 3 Preparation of ferritic-based alloys

[0057] The composition is Fe-10wt.%Cr-5wt.%Ni-2wt.%Al-2.3wt.%Ti gas atomized powder and nano Y 2 o 3 The powder is weighed with a weight ratio of 99.5:0.5 for later use. Dissolve the weighed Fe-10wt.%Cr-5wt.%Ni-2wt.%Al-2.3wt.%Ti aerosolized powder in 8g·L -1 polydiallyldimethylammonium chloride solution, soaked for 15 minutes, and then the nano-Y 2 o 3 After the powder was added into the solution and stirred for 2 hours, the solution was dried to obtain a powder precursor. The powder precursor was stirred for 2 hours in an argon atmosphere at a temperature of 350° C. and a stirring propeller rotating at a speed of 22,000 rpm to obtain nano-oxide-coated ferrite-based alloy powder. Finally, the nano-oxide-wrapped ferrite-based alloy powder is laser clad and formed. The forming parameters are 0.035mm of powder coating thickness, 1200mm / s of scanning speed, and 0.0...

Embodiment 2

[0059] Composition Fe-11.5wt.%Cr-8wt.%Ni-3wt.%Al-3wt.%Ti-0.65wt.%Y 2 o 3 Preparation of ODS ferrite-based alloy

[0060] The composition is Fe-12wt.%Cr-5wt.%Ni-2wt.%Al-3wt.%Mn gas atomized powder and nano Y 2 o 3 The powder is weighed with a weight ratio of 99.35:0.65 for later use. Dissolve the weighed Fe-12wt.%Cr-5wt.%Ni-2wt.%Al-3wt.%Mn gas atomized powder in 4g·L -1 polydiallyldimethylammonium chloride solution, soaked for 30 minutes, and then the nano-Y 2 o 3 After the powder was added into the solution and stirred for 2 hours, the solution was dried to obtain a powder precursor. The powder precursor was stirred for 1.5 hours in an argon atmosphere at a temperature of 380° C. and a stirring propeller rotating at a speed of 24,000 rpm to obtain ferrite-based alloy powder coated with nano oxides. Finally, the nano-oxide-wrapped ferrite-based alloy powder is laser clad and formed. The forming parameters are powder thickness 0.04mm, scanning speed 1500mm / s, and scanning...

Embodiment 3

[0062] Composition Fe-9wt.%Cr-5wt.%Ni-2wt.%Al-1.2wt.%Ti-0.6wt.%La 2 o 3 Preparation of ferritic-based alloys

[0063] The gas-atomized powder and nano La 2 o 3 The powder is weighed with a weight ratio of 99.4:0.6 for future use. Dissolve the weighed Fe-9wt.%Cr-5wt.%Ni-2wt.%Al-1.2wt.%Ti aerosolized powder in 4g·L -1 Cysteine ​​solution, soaked for 30 minutes, and then the nano-La 2 o 3 After the powder was added into the solution and stirred for 2 hours, the solution was dried to obtain a powder precursor. The powder precursor was stirred for 1 hour in an argon atmosphere at a temperature of 520° C. and a stirring propeller rotating at a speed of 26,000 rpm to obtain ferrite-based alloy powder coated with nano oxides. Finally, the nano-oxide-wrapped ferrite-based alloy powder is laser clad and formed. The forming parameters are 0.04mm powder coating thickness, 1600mm / s scanning speed, and 0.03mm scanning distance to obtain the multi-nanophase-strengthened ferrite alloy ...

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Abstract

The invention belongs to the research field of preparation of advanced metal materials, and in particular provides a method for preparing multi-nanometer phase-strengthened ferrite alloys with complex shapes. The specific steps are as follows: first add the gas-atomized iron-based alloy powder into an appropriate concentration of polydiallyl dimethyl ammonium chloride solution or cysteine ​​solution, and then impregnate the nano-Y 2 o 3 or La 2 o 3 The powder is added to the solution for stirring and then dried. Put the obtained precursor powder into a high-speed stirring heating furnace. Under the condition of atmosphere protection, carry out high-speed stirring at a certain temperature to obtain ferrite-based alloy powder coated with nano oxides. . The obtained ferrite-based alloy powder coated with nano-oxide is subjected to laser cladding forming to obtain a multi-nanometer phase-strengthened ferrite alloy with a complex shape. The invention provides a new idea for multi-nanometer phase strengthened ferrite alloy with complex shape, and has the advantages of short production cycle, low cost, convenient operation and the like.

Description

technical field [0001] The invention belongs to the research field of preparation of advanced metal materials, and in particular provides a method for preparing multi-nanometer phase-strengthened ferrite alloys with complex shapes. Background technique [0002] The ferritic alloy matrix has low density and thermal expansion coefficient, excellent mechanical properties and radiation resistance, so it is widely used in the fields of automobile industry, aerospace and nuclear industry. Precipitation-precipitation strengthening is a common method for alloy strengthening. The type, particle size and distribution of the second phase precipitated during the aging process have a crucial impact on the properties of the alloy. Generally speaking, the higher the volume fraction of precipitation strengthening phase and the finer the particle size, the better the strengthening effect. The precipitation of the precipitated phase is a solid-state phase transition process. During the nucle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B22F1/02
CPCC23C24/103B22F1/16
Inventor 章林曲选辉陈晓玮刘烨陈旭秦明礼
Owner UNIV OF SCI & TECH BEIJING