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Preparation method of jet-molded multi-gradient high-speed steel

A spray forming, high-speed steel technology, applied in the field of iron and steel metallurgy, can solve the problems of uneven segregation of alloys, coarse alloy carbides, slow cooling of molten metal, etc., and achieve the effects of low porosity, good interface bonding performance, and fine and uniform structure.

Inactive Publication Date: 2014-11-05
江苏飞达钻头股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ingot casting is usually divided into two types: secondary refining (EAF+LF+VD) or electroslag remelting (ESR). In the above method, due to the slow cooling of the molten metal, the uneven segregation of the alloy and the coarseness of the alloy carbide are caused, thus Affect the performance of high-speed steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing spray-molded multi-gradient high-speed steel. The chemical composition of the high-speed steel consists of the following components in weight percentage: C: 1.5-1.8%, Cr: 4.5-5.0%, Mo: 4.5-5.5%, W : 7.0-7.5%, V: 3.0-3.5%, Nb: 0.6-1.0%, Ti: 0.2-0.5%, Si: 0.5-1.0%, Mn: 0.1-0.4%, and the rest are Fe and unavoidable impurities; Described preparation method comprises the steps:

[0017] 1) Batching process: batching is carried out according to the composition of the alloy;

[0018] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace and heat to 1700-1720°C higher than the melting point of the alloy, and keep it warm for 10-30 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform, and then Heating the high-speed steel melt under the protection of inert gas;

[0019] 3) Spray molding: more than one alloy liquid crucibles are arranged in turn above the high-speed steel m...

Embodiment 2

[0025] A method for preparing spray-molded multi-gradient high-speed steel. The chemical composition of the high-speed steel consists of the following components in weight percentage: C: 1.5-2.0%, Cr: 4.8-5.0%, Mo: 4.5-5.5%, W : 7.0-7.2%, V: 3.0-3.8%, Nb: 0.6-1.0%, Ti: 0.2-0.4%, Si: 0.5-1.0%, Mn: 0.1-0.5%, the rest is Fe and unavoidable impurities; Described preparation method comprises the steps:

[0026] 1) Batching process: batching is carried out according to the composition of the alloy;

[0027] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace and heat to 1700-1750°C higher than the melting point of the alloy, and keep it warm for 10-30 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform, and then Heating the high-speed steel melt under the protection of inert gas;

[0028] 3) Spray molding: more than one alloy liquid crucibles are arranged in turn above the high-speed steel melt, ...

Embodiment 3

[0034] A method for preparing spray-molded multi-gradient high-speed steel. The chemical composition of the high-speed steel consists of the following components in weight percentage: C: 1.5-1.8%, Cr: 4.5-4.8%, Mo: 4.5-5.5%, W : 7.2-7.5%, V: 3.4-3.8%, Nb: 0.6-1.0%, Ti: 0.2-0.5%, Si: 0.5-1.0%, Mn: 0.1-0.5%, the rest is Fe and unavoidable impurities; Described preparation method comprises the steps:

[0035] 1) Batching process: batching is carried out according to the composition of the alloy;

[0036] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace and heat to 1720-1750°C higher than the melting point of the alloy, and keep it warm for 10-30 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform, and then Heating the high-speed steel melt under the protection of inert gas;

[0037]3) Spray molding: more than one alloy liquid crucibles are arranged in sequence above the high-speed steel mel...

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Abstract

The invention provides a preparation method of a jet-molded multi-gradient high-speed steel. The high-speed steel is composed of the following chemical components in percentage by weight: 1.5-2.0% of C, 4.5-5.0% of Cr, 4.5-5.5% of Mo, 7.0-7.5% of W, 3.0-3.8% of V, 0.6-1.0% of Nb, 0.2-0.5% of Ti, 0.5-1.0% of Si, 0.1-0.5% of Mn and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: blending materials, melting, carrying out jet molding, carrying out air cooling, annealing, carrying out hot forging and carrying out quench tempering. Due to the adopted method, the nebulization efficiency and deposition efficiency of the nozzle are improved and continuous preparation of a multi-layer composite material is realized. The preparation method of the jet-molded multi-gradient high-speed steel has the beneficial effects of low porosity (2-4%) of the deposited blank, fine and even structure (mean grain size ranging from 0.9 to 20 microns), excellent interfacial mechanical property and high material yield (72%-85%).

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing spray-molded multi-gradient high-speed steel. Background technique [0002] High-speed steel is a kind of high-alloy steel, which has high thermal hardness after heat treatment. When the cutting temperature is as high as 600°C, the hardness does not drop significantly. The cutting speed of the tool made by it can reach more than 60 meters per minute, and its hardness is 63- 65HRC. [0003] However, high-speed steel usually contains Co element, and because Co is expensive, high-speed steel is expensive. There are two manufacturing methods for high-speed steel, one is traditional ingot casting, and the other is manufacturing by powder metallurgy. Ingot casting is usually divided into two types: secondary refining (EAF+LF+VD) or electroslag remelting (ESR). In the above method, due to the slow cooling of the molten metal, the uneven segrega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/36C22C38/28C21D6/00
Inventor 徐轶陈德康陈焱朱红义巢玉琴
Owner 江苏飞达钻头股份有限公司
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