Method for preparing high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and application

A technology of pressurized electroslag and gradient materials, applied in the field of high-speed steel, which can solve problems affecting the hardness and toughness of gradient materials, poor nitrogen distribution, and difficulty in accurately controlling nitrogen content

Active Publication Date: 2021-09-10
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing gradient material preparation process, the powder metallurgy method can be used to prepare nitrogen-containing high-speed steel gradient materials, but there are problems in the preparation of high-nitrogen steel materials by powder metallurgy, such as poor nitrogen distribution and difficult precise control of nitrogen content, which affects the gradient material. Matching of Hardness and Toughness

Method used

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  • Method for preparing high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and application
  • Method for preparing high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and application
  • Method for preparing high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and application

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preparation example Construction

[0050] In the present invention, the preparation method of the ingot preferably comprises the following steps:

[0051] The invention smelts industrial pure iron, chromium-containing raw materials, molybdenum-containing raw materials, metal tungsten, metal cobalt, manganese-containing raw materials, vanadium-containing raw materials, graphite and rare earth elements to obtain molten steel;

[0052] The molten steel is cast to obtain an ingot.

[0053] The invention smelts industrial pure iron, chromium-containing raw materials, molybdenum-containing raw materials, metal tungsten, metal cobalt, manganese-containing raw materials, vanadium-containing raw materials, graphite and rare earth elements to obtain molten steel. In the present invention, the smelting preferably includes the following steps:

[0054] Vacuum induction melting of industrial pure iron, chromium-containing raw materials, molybdenum-containing raw materials, metal tungsten, and metal cobalt to obtain basic m...

Embodiment 1

[0102] Put 35980.3g of industrial pure iron, 1841.1g of metal chromium, 4641.2g of metal molybdenum, 730.5g of metal tungsten, and 1600.18g of metal cobalt into the crucible in a vacuum induction furnace. Induction melting to obtain basic molten steel;

[0103] Fill the vacuum induction furnace with argon with a purity of ≥99.999% so that the pressure in the furnace is 0.023MPa, add 315.8g of graphite (accounting for 60% of the total mass of graphite, based on the target composition) to the base molten steel under an argon atmosphere Add 6.8% more), carry out 25min vacuum carbon deoxidation reaction under the condition of 1460 ℃ of vacuum degree of 15Pa temperature, obtain pre-deoxidized molten steel;

[0104] Fill the furnace with argon gas with a purity ≥99.999% to make the furnace pressure 0.02MPa, add 152.0g metal manganese, 1136.1g vanadium iron, 210.5g graphite, and 20g cerium to the pre-deoxidized molten steel under an argon atmosphere Further vacuum induction melting ...

Embodiment 2

[0119] Put 36695.2g of industrial pure iron, 1795.0g of metal chromium, 4554.9g of metal molybdenum, 643.8g of metal tungsten, and 3861.8g of metal cobalt into the crucible in the vacuum induction furnace, and conduct vacuum induction at a vacuum degree of 6.6Pa and a temperature of 1510°C. Smelting to obtain basic molten steel;

[0120] Fill the vacuum induction furnace with argon with a purity of ≥99.999% so that the pressure in the furnace is 0.02MPa, add 322.0g of graphite (accounting for 60% of the total mass of graphite, based on the target composition) to the base molten steel under an argon atmosphere Add 6.7% more), carry out 20min vacuum carbon deoxidation reaction under the condition that the vacuum degree is 18Pa and the temperature is 1470° C., to obtain pre-deoxidized molten steel;

[0121] Fill the furnace with argon gas with a purity ≥99.999% to make the furnace pressure 0.02MPa, add 214.6g of graphite, 126.6g of metal manganese, 1197.6g of vanadium iron, and 2...

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Abstract

The invention belongs to the technical field of high-speed steel, and particularly relates to a method for preparing a high-nitrogen high-speed steel gradient material by determining pressurized electroslag remelting pressure and dynamically adjusting pressure and an application. According to the method, the high-speed steel gradient material with the expected nitrogen content in gradient distribution is obtained by dynamically adjusting the pressure of pressurized electroslag remelting. The gradient distribution of nitrogen elements in an electroslag ingot is realized by utilizing the solubility difference of nitrogen under different pressures, the performance mutation of the electroslag ingot is effectively avoided, a contradiction between the hardness and the toughness of a traditional material is broken through, and hardness and toughness of the traditional material are more reasonably matched, so that the high effect gradient material which can bear load actions such as bending, twisting and impact vibration and the like with high-hardness, high-red-hardness and high-wear-resistance is obtained.

Description

technical field [0001] The invention belongs to the technical field of high-speed steel, and in particular relates to a method for determining the pressure of pressurized electroslag remelting and dynamically adjusting the pressure to prepare gradient materials of high-nitrogen high-speed steel and its application. Background technique [0002] Due to its high hardness, high wear resistance and heat resistance, good strength and toughness, and excellent process performance, high-speed steel is widely used in the manufacture of various cutting tools, high-load molds, aviation high-temperature bearings and many other fields. Carbide, as an important phase in high-speed steel, is an important guarantee for high-speed steel to have high hardness, high red hardness, and high wear resistance. The root of steel performance. Nitrogen is used as a microalloying element, which can be added to high-speed steel to refine and uniform eutectic carbides, and at the same time improve the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C21C7/06C21C7/10C22C33/04C22C38/22C22C38/04C22C38/02C22C38/24C22C38/30
CPCC22B9/18C22C33/04C21C7/06C21C7/10C22C38/22C22C38/001C22C38/04C22C38/02C22C38/24C22C38/30Y02P10/25
Inventor 李花兵冯浩刘壮壮姜周华朱红春张树才焦卫超杨守星贺彤
Owner NORTHEASTERN UNIV
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