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Method for increasing content of solid solution oxygen in alloy

An oxygen content and alloy technology, which is applied in the field of increasing the solid solution oxygen content in the alloy, can solve problems such as reducing the performance of the alloy, and achieve the effects of ensuring strength and toughness, increasing the solid solution oxygen content and high efficiency.

Active Publication Date: 2020-04-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing oxide dispersion strengthened alloy by traditional "smelting method", although the oxygen content in the molten alloy liquid can reach 2000ppm, the oxygen concentration in the solidified alloy does not exceed 30ppm. , Excessively high dissolved oxygen will turn into gas and escape, or combine with elements in molten steel to form inclusions, which will significantly reduce the performance of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for increasing the solid dissolved oxygen content in the alloy of the present embodiment comprises the following steps:

[0022] (1) Under the protection of argon atmosphere, Fe 78%, Ti 10%, W 2% and Y 2 o 3 10% is added to the ball mill for mechanical alloying to realize the solid solution of oxygen in the matrix to obtain oxygen supersaturated alloy powder;

[0023] (2) Utilize the vacuum induction furnace to smelt China's low-activation radiation-resistant structural steel (CLAM) molten steel, based on the total mass of the CLAM molten steel as 100%, the components and mass percentages of the CLAM molten steel are C 0.1%, Cr 9.0%, W 1.5%, V0.20%, Ta 0.19%, Mn 0.45%, Si 0.05%, the balance is Fe;

[0024] (3) Add the oxygen supersaturated alloy powder prepared in step (1) into molten steel with a supercooling degree of 20°C at a temperature of 1550°C, stir for 5 minutes, and then rapidly solidify at a rate of 60°C / min;

[0025] Wherein, the density of the ...

Embodiment 2

[0028] A method for increasing the solid dissolved oxygen content in the alloy of the present embodiment comprises the following steps:

[0029] (1) Under the protection of nitrogen atmosphere, Ni 80% and Fe 2 o 3 Add 20% into the ball mill for mechanical alloying to realize the solid solution of oxygen in the matrix to obtain oxygen supersaturated alloy powder;

[0030] (2) Utilize the vacuum induction furnace to smelt nickel-based alloy molten steel, the total mass of the alloy molten steel is 100%, and the components and mass percentages of the molten steel are Ni 52%, Cr 19%, Mo 3.0%, Nb 5.0% , Y6.0%, the balance is Fe;

[0031] (3) Add the oxygen supersaturated alloy powder prepared in step (1) into molten alloy steel with a supercooling degree of 50°C at a temperature of 1550°C, stir for 8 minutes, and then rapidly solidify at a speed of 100°C / min;

[0032] Wherein, the density of the oxygen supersaturated alloy powder is 120% of the density of the molten alloy steel...

Embodiment 3

[0035] A method for increasing the solid dissolved oxygen content in the alloy of the present embodiment comprises the following steps:

[0036] (1) Under the protection of argon atmosphere, Fe40%, W10%, Y10% and Fe 3 o 4 Add 40% to the ball mill for mechanical alloying to realize the solid solution of oxygen in the matrix to obtain oxygen supersaturated alloy powder;

[0037] (2) Using a vacuum induction furnace to smelt China's low-activation radiation-resistant structural steel (CLAM) molten steel, taking the total mass of the CLAM molten steel as 100%, the components and mass percentages of the CLAM molten steel are C0.1 %, Cr90%, W1.5%, V0.20%, Ta0.19%, Mn0.45%, Si0.05%, the balance is Fe;

[0038] (3) Add the oxygen supersaturated alloy powder prepared in step (1) into the molten alloy liquid with a supercooling degree of 40°C at a temperature of 1550°C, stir for 10 minutes, and then rapidly solidify at a speed of 400°C / min;

[0039] Wherein, the density of the oxygen...

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Abstract

The invention provides a method for increasing a content of solid solution oxygen in an alloy. The method comprises the following steps of (1) mechanically alloying alloy main elements and 10%-50% ofan oxide powder to prepare an oxygen supersaturated alloy powder; (2) adding the oxygen supersaturated alloy powder into an alloy liquid, and realizing uniform dispersion of the alloy powder in the alloy liquid through stirring, wherein density of the oxygen supersaturated alloy powder is 90%-120% of the density of the alloy liquid, an oxygen content of the oxygen supersaturated alloy powder is 3%-10% wt, and a melting point of the oxygen supersaturated alloy powder is 30-50 DEG C higher than the temperature of the alloy liquid. The method has advantages that problems of cavities and inclusions caused by directly filling oxygen into the alloy in a traditional ''smelting method'' are solved; the solid solution oxygen content in the alloy is greatly increased under the condition that strength and toughness of the alloy are guaranteed; a foundation is laid for preparing an oxide reinforced alloy through the smelting method; moreover, the method is simple in process, high in efficiency and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of alloy material preparation, in particular to a method for increasing the solid dissolved oxygen content in alloys. Background technique [0002] Diffusion strengthening is one of the methods of material strengthening. Compared with strengthening methods such as fine grain strengthening, solid solution strengthening, and precipitation strengthening, dispersion strengthening breaks through the limitation of material recrystallization, and still has a strengthening effect near the melting point. Oxide dispersion-strengthened material is the most important kind of dispersion-strengthened material. It introduces stable, uniform, and fine second-phase oxides into the metal matrix to pin the dislocation movement to improve the strength of the material; at the same time, due to the oxidation The material has high thermal stability at high temperature, which can hinder the grain boundary slip of the material at a higher te...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/26C22C38/04C22C38/02C22C33/04C22C19/05C22C32/00C22C1/10C22C1/02
CPCC22C38/22C22C38/24C22C38/26C22C38/04C22C38/02C22C32/0026C22C33/04C22C19/056C22C1/1036C22C1/1047
Inventor 毛小东赵彦云宋亮亮刘少军黄群英
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI