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High-speed steel strengthened and hardened through combination of Laves phase and mu phase and preparation method of high-speed steel

A high-speed steel and preparation process technology, which is applied in the field of high-speed steel and its preparation through Laves phase and μ phase composite strong hardening, can solve the problems of low hardness and wear resistance, etc.

Active Publication Date: 2020-10-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low hardness and non-wear resistance of traditional carbide hardened high-speed steel in the prior art at high temperature and high speed, the purpose of the present invention is to provide a Laves phase with high hardness, toughness, and good wear resistance that is generated in situ and μ-phase compound strong hardened high-speed steel and preparation method thereof

Method used

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  • High-speed steel strengthened and hardened through combination of Laves phase and mu phase and preparation method of high-speed steel
  • High-speed steel strengthened and hardened through combination of Laves phase and mu phase and preparation method of high-speed steel
  • High-speed steel strengthened and hardened through combination of Laves phase and mu phase and preparation method of high-speed steel

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Experimental program
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Effect test

Embodiment 1

[0044] The raw materials are prepared according to the design formula, and the mass percentages are: Fe: 50%, Co: 20%, Mo: 15%, W: 8%, Nb: 3%, Ti: 3%. Put the raw material powder, 0.5wt% carbon black, and 3wt% paraffin wax as a forming agent into a roller ball mill in a nitrogen atmosphere for wet ball milling. The ball milling medium is alcohol, the ball-to-material ratio is 6:1, and the ball milling time is 48 hours. The ball-milled mixed raw material is dried and granulated by wiping and sieving, and is subjected to two-way molding with a pressing pressure of 200 MPa to obtain a cold compact. The obtained compact is sintered in a vacuum sintering furnace with a maximum sintering temperature of 1380° C., and a sintered compact is obtained after cooling. The sintered compact was subjected to solution treatment in a salt bath and cooled by oil cooling. The solution temperature was 1270°C and the solution time was 12 minutes. The solid solution material hardness is HRC42.7. T...

Embodiment 2

[0046] The raw materials are prepared according to the design formula, and the mass percentages are: Fe: 56%, Co: 20%, Mo: 13%, W: 5%, Nb: 4%, Ti: 2%. Put the raw material powder, 0.5wt% carbon black, and 3wt% paraffin wax as a forming agent into a roller ball mill in a nitrogen atmosphere for wet ball milling. The ball milling medium is alcohol, the ball-to-material ratio is 6:1, and the ball milling time is 50h. The ball-milled mixed raw materials were dried and granulated by wiping and sieving, and passed through two-way molding with a pressing pressure of 180 MPa to obtain a cold compact. The obtained compact is sintered in a vacuum sintering furnace with a maximum sintering temperature of 1340° C., and the sintered compact is obtained after cooling. The sintered billet was solid solution treated in a salt bath and cooled by oil cooling. The solid solution temperature was 1260°C, the solid solution time was 15 minutes, and the solid solution material hardness was HRC42.3. ...

Embodiment 3

[0048] The raw materials are prepared according to the design formula, and the mass percentages are: Fe: 56%, Co: 18%, Mo: 12%, W: 4%, Nb: 2%, Ti: 2%. Put the raw material powder, 0.6wt% carbon black, and 4wt% paraffin wax as a forming agent into a roller ball mill in a nitrogen atmosphere for wet ball milling. The ball milling medium is alcohol, the ball-to-material ratio is 5:1, and the ball milling time is 50h. The ball-milled mixed raw materials were dried and granulated by wiping and sieving, and passed through two-way molding with a pressing pressure of 180 MPa to obtain a cold compact. The obtained compact is sintered in a vacuum sintering furnace with a maximum sintering temperature of 1330° C., and the sintered compact is obtained after cooling. The sintered compact was subjected to solution treatment in a salt bath and cooled by oil cooling. The solution temperature was 1260°C and the solution time was 15 minutes. The solid solution material hardness is HRC42.2. Th...

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Abstract

The invention discloses high-speed steel strengthened and hardened through the combination of the Laves phase and the mu phase and a preparation method of the high-speed steel. The high-speed steel comprises a steel substrate and the strengthening and hardening phases which are dispersed in the steel substrate. The strengthening and hardening phases include the Laves phase and the mu phase. The Laves phase comprises Fe2Nb, Fe2Ti and Fe2W, and the mu phase comprises Fe7Mo6, Co7Mo6, Fe7W6 and Co7W6. According to the high-speed steel, strengthening and hardening operation is conducted through theLaves phase and the mu phase generated in an in-situ mode in the sintering process, the fine mu phase strengthens the substrate so that the substrate can have the higher hardness at high temperature,and the Laves phase with the high hardness and large particles enables the material to have the higher wear resistance. The intermetallic compound strengthening phases generated in an in-situ mode have the good interface relationship with the substrate, and are low in diffusion speed at high temperature, and therefore the material still keeps the high strength, the high toughness and the high heat conductivity coefficient as a large number of alloy elements are added to the material to achieve the high hardness, and the material has the excellent tempering resistance, the excellent high-temperature hardness and the excellent high-temperature strength and has the more excellent performance compared with traditional high-speed steel in the high-temperature and high-speed cutting operation.

Description

Background technique [0001] The invention belongs to the technical field of high-speed steel manufacturing, and relates to a high-hardness and high-toughness powder metallurgy high-speed steel, in particular to a high-speed steel hardened through Laves phase and μ phase compounding and a preparation method thereof. technical field [0002] Since its birth at the end of the 19th century, high-speed steel has been one of the commonly used cutting tool materials, and it still accounts for 45% of the world’s sales of cutting tools. High-speed steel has good red hardness and wear resistance that conventional carbon tool steel and alloy tool steel do not have. , and has impact resistance and heat treatment to adjust the mechanical properties and machinability of materials that cemented carbide and ceramic tools cannot match. However, with the continuous advancement of the industrialization process, the traditional carbide hardened high-speed steel cannot fully meet the increasingl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/10C22C38/12C22C38/14C22C33/02C21D1/18C21D1/773
CPCC21D1/18C21D1/773C22C33/0285C22C38/10C22C38/12C22C38/14
Inventor 康希越谢丰伟袁紫仁贺跃辉
Owner CENT SOUTH UNIV
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