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A kind of boride-containing powder high-speed steel and its preparation method

A boride and high-speed steel technology, applied in the field of high-speed steel manufacturing, can solve the problems of increasing the preparation process, increasing the production cost, and long preparation cycle

Active Publication Date: 2021-08-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the ball milling process is used to realize the mixing of boron compounds and metal powders, which increases the preparation process and increases the production cost, and the ball milling process brings long preparation cycles, the introduction of foreign impurities, surface oxidation and uneven powder mixing. And other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing boride-containing powder high-speed steel, specifically comprising:

[0029] 1) Vacuum smelting: M2 high-speed steel is smelted in a vacuum induction furnace, the end point temperature is controlled at 1640°C, and the atomization temperature of molten steel is 1600°C; molten steel components and their mass percentages: C0.85%, Si0.35%, Mn0.28% , W5.12%, Mo5.03%, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0030] 2) Preparation of boride-containing high-speed steel powder

[0031] Gas powder atomization preparation B 4 C evenly disperses M2 high-speed steel powder, atomizing high-pressure gas is N 2 , the pressure is 3MPa; atomized powder is B 4 C powder, B 4 C particle size is D50≤2μm, where B 4 The volume percentage of powder with C less than 200nm is 12%. B 4 The flow rate of C powder particles is 2.0kg / min. Prepared containing 0.25% (mass fraction) B 4 Composite powder of C powder.

[0032] 3) Perform ...

Embodiment 2

[0036] A method for preparing boride-containing powder high-speed steel, specifically comprising:

[0037] 1) Vacuum smelting: M2 high-speed steel is smelted in a 50kg vacuum induction furnace, the end point temperature is controlled at 1640°C, and the atomization temperature of molten steel is 1610°C; molten steel components and their mass percentages: C0.85%, Si0.35%, Mn0.28 %, W5.12%, Mo5.03%, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0038] 2) Preparation of boride-containing high-speed steel powder

[0039] Gas powder atomization to prepare BN uniformly dispersed M2 high-speed steel powder, the atomized high-pressure gas is N 2 , the pressure is 3Mpa; the solid atomization medium is BN powder, the particle size of BN is D50≤2μm, and the volume percentage of powder with BN less than 200nm is 10%. The flow rate of BN powder particles is 2.9kg / min. A composite powder containing 0.3% (mass fraction) BN powder was prepared.

[0040] 3) Pe...

Embodiment 3

[0044] A method for preparing boride-containing powder high-speed steel, specifically comprising:

[0045] 1) Vacuum melting: M2 high-speed steel is smelted in a 50kg vacuum induction furnace, the end point temperature is controlled at 1640°C, and the atomization temperature of molten steel is 1615°C; molten steel components and their mass percentages: C0.85%, Si0.35%, Mn0.28 %, W5.12%, Mo5.03%, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0046] 2) Preparation of boride-containing high-speed steel powder

[0047] Preparation of Fe by Gas Powder Atomization 2 B evenly disperses M2 high-speed steel powder, and the atomized high-pressure gas is N 2 , the pressure is 3Mpa; the solid atomization medium is Fe 2 B powder, Fe 2 B particle size is D50≤2μm, where Fe 2 The volume percentage of B powder smaller than 200nm is 20%. Fe 2 The flow rate of B powder particles is 4.8kg / min. Prepared containing 0.5% (mass fraction) Fe 2 Composite powder o...

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Abstract

The invention relates to a boride-containing powder high-speed steel and a preparation method thereof. The relative density of the composite material is >99%, and the hardness is 65.5-69.4HRC; the matrix of the composite material is M2 powder high-speed steel, and the mass percentage of the composition is C0. 80~0.90%, Si0.30~0.40%, Mn0.25~0.32%, W5.00~5.50%, Mo4.90~5.10%, Cr3.80~4.20%, V1.80~2.20%, balance Fe and unavoidable impurities; the boride powder is evenly dispersed in the matrix as an added particle, and the mass fraction of the boride powder is 0.2% to 0.5%. In the preparation process, in atomization powder making, the atomization medium is a mixture of high-pressure gas and boride powder, and the high-speed steel powder with evenly dispersed boride powder is prepared under the co-atomization of gas powder. The powder metallurgy high-speed steel preparation method of the present invention can adjust the hardness and bending strength of the powder high-speed steel by adjusting the boride composition, particle size and injection amount in the atomization medium, and achieve excellent comprehensive mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of high-speed steel manufacturing, and particularly provides a method for preparing high-performance powder high-speed steel quickly, efficiently and at low cost. Background technique [0002] High-speed steel is a high-carbon, high-alloy ledeburite steel. It is a commonly used tool and mold material and is widely used in the processing and manufacturing industry. Traditional casting and forging high-speed steel has coarse carbides and serious structure segregation. In order to improve the uniformity of the structure, there are many forging modification procedures and complex processes. In order to solve the problems faced by casting and forging high-speed steel, powder high-speed steel was born. The process of powder high speed steel includes powder sheath hot isostatic pressing and powder pressing sintering. Powder sheathed hot isostatic pressed high-speed steel has excellent performance and is the ultim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32C22C38/44C22C38/46C22C38/54B22F3/04B22F3/10B22F3/24B22F9/08C21D1/18C21D6/00
CPCB22F3/04B22F3/1007B22F3/24B22F9/082B22F2003/248C21D1/18C21D6/002C21D6/005C21D6/008C22C33/0278C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32C22C38/44C22C38/46C22C38/54
Inventor 康磊廖相巍贾吉祥李广帮尚德礼郭庆涛唐雪峰黄玉平康伟赵亮
Owner ANGANG STEEL CO LTD