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Oxide dispersion strengthened alloy and preparation method and application thereof

A dispersion strengthening and oxide technology, applied in the field of metal materials, can solve the problems of inability to produce high-quality powders on a large scale, poor toughness and plasticity of consolidated alloys, poor process controllability and poor product qualification rate, etc. Cost and impurity content, improve comprehensive mechanical properties, shorten the effect of preparation time

Active Publication Date: 2022-05-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the efficiency of powder preparation by mechanical alloying is low, and high-quality powder cannot be produced on a large scale, and the toughness and plasticity of the consolidated alloy are poor, which cannot meet the needs of long-term service performance of the material, and the entire preparation process is easy to introduce pollution. Poor controllability and product pass rate

Method used

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  • Oxide dispersion strengthened alloy and preparation method and application thereof
  • Oxide dispersion strengthened alloy and preparation method and application thereof
  • Oxide dispersion strengthened alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Mix the powder material of Co-40Fe-15Ni alloy with 10% Y 2 O 3 The ball-milled powder of +Fe is uniformly mixed according to the volume ratio of 100:1 to obtain the powder used for additive manufacturing, and its morphology is as follows figure 1 shown. In the additive manufacturing process, the laser power is 250W, the scanning rate is 1.0m / s, the powder layer thickness is 40μm, the scanning path between layers is at an angle of 67°, and argon gas is used to obtain the additive manufacturing in the printed state. alloys with microstructures such as figure 2 shown. The as-printed alloy is tempered at 525° C. for 1 h to obtain the oxide dispersion strengthened alloy, and its microstructure is as follows image 3 As shown, the yield strength is 1563MPa, the tensile strength is 1621MPa, the elongation is 5.2%, and the V-notch impact energy at room temperature is 9.8J.

Embodiment 2

[0043] Mix the powder material of Co-40Fe-15Ni alloy with 10% Y 2 O 3 The ball-milled powder of +Fe is uniformly mixed according to the volume ratio of 100:1 to obtain the powder used for additive manufacturing, and its morphology is as follows figure 1 shown. In the additive manufacturing process, the laser power is 250W, the scanning rate is 1.0m / s, the powder layer thickness is 40μm, the scanning path between layers is at an angle of 67°, and argon gas is used to obtain the additive manufacturing in the printed state. alloys with microstructures such as figure 2 shown. The as-printed alloy is tempered at 775°C for 1 h to obtain the oxide dispersion strengthened alloy, whose dual-phase microstructure and fine-grained substructure are as follows Figure 4 and Figure 5 As shown, the yield strength is 1184MPa, the tensile strength is 1321MPa, the elongation is 9.3%, and the V-notch impact energy at room temperature is 61.7J.

Embodiment 3

[0045] Mix the powder material of Co-40Fe-15Ni alloy with 10% Y 2 O 3 The ball-milled powder of +Fe is uniformly mixed according to the volume ratio of 100:1 to obtain the powder used for additive manufacturing, and its morphology is as follows figure 1 shown. In the additive manufacturing process, the laser power is 250W, the scanning rate is 1.0m / s, the powder layer thickness is 40μm, the scanning path between layers is at an angle of 67°, and argon gas is used to obtain the additive manufacturing in the printed state. alloys with microstructures such as figure 2 shown. The as-printed alloy was tempered at 800 °C for 5 hours to obtain the oxide dispersion strengthened alloy, and the macroscopic morphology of the oxide particles was as follows Image 6 As shown, the yield strength is 1014MPa, the tensile strength is 1109MPa, the elongation is 9.8%, and the V-notch impact energy at room temperature is 90.3J.

[0046] figure 1 It is Co-45Fe-10Ni alloy powder material and...

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Abstract

The invention relates to an oxide dispersion strengthened alloy and a preparation method and application thereof, and the preparation method comprises the following steps: mixing main body material powder and additive material powder, printing and forming by adopting a powder laying additive manufacturing mode, and then carrying out heat treatment to obtain the oxide dispersion strengthened alloy, the main body material powder is alloy material powder containing Cr and / or Ni, and the additive material powder is iron-based mechanical ball-milled powder containing Y2O3 and / or TiO2; the oxide dispersion strengthened alloy is used in the field of molds. Compared with the prior art, the defects of preparation of oxide dispersion strengthened alloy through powder metallurgy are overcome, the comprehensive mechanical property of current additive manufacturing alloy is also improved, compared with additive manufacturing forming of existing die steel, additional steps do not need to be added in the whole preparation process, set main body material printing parameters do not need to be changed, the preparation method is simple, and the cost is low. And the die quality is improved, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to an oxide dispersion strengthened alloy and a preparation method and application thereof. Background technique [0002] At present, in the preparation of oxide dispersion strengthened alloys, powders are mainly prepared by mechanical alloying, and then consolidated by hot extrusion or hot isostatic pressing. or 5-30nm Y 2 O 3 , Y 2 Ti 2 O 7 , Y 2 TiO 5 and other oxides to pin grain boundaries and dislocations to improve the strength and creep properties of the alloy. However, the efficiency of mechanical alloying to prepare powder is low, and high-quality powder cannot be produced on a large scale, and the toughness and plasticity of the alloy formed by consolidation are poor, which cannot meet the requirements of long-term service performance of the material, and the whole preparation process is easy to introduce pollution. Controllability and product qualification ...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F10/64B22F1/12C22C1/05C22C32/00C22C30/00C22C33/02B22F5/00C21D1/18C21D6/04C21D1/26C21D1/25C22F1/00B33Y10/00B33Y70/10B33Y40/20
CPCB22F10/28B22F10/64C22C1/05C22C32/0026C22C30/00C22C33/0228B22F5/007C21D1/18C21D6/04C21D1/26C21D1/25C22F1/00C22F1/002B33Y10/00B33Y70/10B33Y40/20Y02P10/25
Inventor 刘庆冬于一笑林钢刘妍洁张静顾剑锋
Owner SHANGHAI JIAO TONG UNIV
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