High-density high-strength alloy steel and preparation method thereof

A high-strength alloy steel technology, applied in the field of alloy steel, can solve the problems of plasticity drop and low density, achieve the effects of inhibiting grain boundary segregation, improving hardenability, and good application prospects

Active Publication Date: 2020-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this kind of alloy contains a large amount of tungsten elements with high melting point, it is usually prepared by powder metallurgy process. The strength of the obtained tungsten alloy is usually about 1000MPa. After large deformation treatment, the strength can be increased to more than 1300MPa, but the plasticity drops significantly.
Ultra-high-strength steel has good strong plasticity, but its density is relatively low, so it is necessary to develop an alloy steel with high density and high strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) According to the mass ratio of 20:13.8:6.8:6.5:0.3:0.1:52.5, put the metal elements W, Ni, Mo, Co, Ti, Al and Fe into the smelting furnace, and evacuate until the vacuum degree in the furnace is < 50Pa, heating to completely melt the raw material and no bubbles overflowing the surface of the molten pool, then keep the temperature for 30min under the conditions of vacuum degree <1Pa and 1600℃, then cast and cool under vacuum to obtain a steel ingot with a diameter of 50mm;

[0025] (2) The steel ingot is loaded into a furnace with a temperature not higher than 550°C, then heated to 1200°C and kept for 6 hours to homogenize the structure and chemical composition of the steel ingot;

[0026] (3) The homogenized steel ingot is forged with a round die. The initial forging temperature is 1200°C and the final forging temperature is 1050°C. During the forging process, the forging deformation of each pass is 5mm. Return to the furnace and heat to 1200°C, forge four times, pu...

Embodiment 2

[0030] (1) According to the mass ratio of 24:13:6:6.3:0.3:0.1:50.3, put the metal elements W, Ni, Mo, Co, Ti, Al and Fe into the smelting furnace, and evacuate until the vacuum degree in the furnace is < 50Pa, heating to completely melt the raw material and no bubbles overflowing the surface of the molten pool, then keep the temperature for 30min under the conditions of vacuum degree <1Pa and 1600℃, then cast and cool under vacuum to obtain a steel ingot with a diameter of 50mm;

[0031] (2) The steel ingot is loaded into a furnace with a temperature not higher than 550°C, then heated to 1200°C and kept for 6 hours to homogenize the structure and chemical composition of the steel ingot;

[0032] (3) The homogenized steel ingot is forged with a round die. The initial forging temperature is 1200°C and the final forging temperature is 1050°C. During the forging process, the forging deformation of each pass is 5mm. Return to the furnace and heat to 1200°C, forging four times, and ...

Embodiment 3

[0036](1) According to the mass ratio of 22:13:7:6:0.3:0.1:51.6, weigh the raw materials of the metal elements W, Ni, Mo, Co, Ti, Al and Fe and put them into the melting furnace, and then vacuumize the furnace to The inner vacuum degree is less than 50Pa. After heating to completely melt the raw materials and no bubbles overflow on the surface of the molten pool, keep the temperature for 1 hour under the condition of vacuum degree less than 1Pa and 1650°C, then cast and cool under vacuum to obtain a steel ingot with a diameter of 50mm;

[0037] (2) The steel ingot is loaded into a furnace with a temperature not higher than 550°C, then heated to 1200°C and kept for 6 hours to homogenize the structure and chemical composition of the steel ingot;

[0038] (3) The homogenized steel ingot is forged with a round die. The initial forging temperature is 1200°C and the final forging temperature is 1050°C. During the forging process, the forging deformation of each pass is 5mm. Return t...

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Abstract

The invention relates to a high-density high-strength alloy steel and a preparation method thereof and belongs to the technical field of alloy steel. The ingredients of the alloy steel comprise 8%-14%of Ni, 5%-8% of Co, 4%-7% of Mo, 18%-24% of W, 0.2%-0.6% of Ti, smaller than 0.2% of Al and the balance Fe and inevitable impurity elements. By adjusting and controlling the ingredients of the alloysteel and the contents of the ingredients, the problems that in a traditional smelting process, W, Mo and other elements cause severe carbide segregation due to a high density and a high melting point, and deposition is generated in a liquid phase due to gravity are avoided; the alloy steel has high compactness, high density and high strength; in addition, the alloy steel is prepared by the adoption of a traditional smelting process, the process is mature, operation is easy, and industrial production is easy to achieved.

Description

technical field [0001] The invention relates to a high-density high-strength alloy steel and a preparation method thereof, belonging to the technical field of alloy steel. Background technique [0002] Ultra-high-strength steel is a kind of steel that has been gradually developed to meet the needs of the aviation and aerospace industries since the 1940s. Its main characteristics are high strength and certain toughness. It is an important component of impact load and is widely used in civil and military applications. [0003] The current high-density alloys are mainly composed of tungsten as the matrix and a small amount of Ni, Fe, Cu and other elements. They are often used in the fields of aerospace, national defense and military for counterweights, inertial rotating elements, armor-piercing projectiles, and shielding materials. Since this type of alloy contains a large amount of tungsten elements with high melting point, it is usually prepared by powder metallurgy process....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C22C38/10C22C38/12C22C38/14C22C38/06C21D8/06C21D1/18
CPCC22C38/105C22C38/12C22C38/14C22C38/06C21D8/065C21D1/18
Inventor 程兴旺刘安晋王琳潘磊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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