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A kind of high-speed steel hardened through laves phase and μ phase composite and its preparation method

A technology of high-speed steel and steel matrix, which is applied in the field of high-speed steel hardened through Laves phase and μ phase composite and its preparation, which can solve the problems of low hardness and non-wear resistance, and achieve high material utilization rate and stable shape and size of tools , strong anti-aggregation effect

Active Publication Date: 2021-10-12
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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  • A kind of high-speed steel hardened through laves phase and μ phase composite and its preparation method
  • A kind of high-speed steel hardened through laves phase and μ phase composite and its preparation method
  • A kind of high-speed steel hardened through laves phase and μ phase composite and its preparation method

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Experimental program
Comparison scheme
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 a high-speed steel which is hardened through Laves phase and μ phase composite hardening and a preparation method thereof. The high-speed steel is composed of a steel matrix and a hardening phase dispersed in the steel matrix, and the hardening phase is composed of a Laves phase and μ phase composition, the Laves phase contains Fe 2 Nb, Fe 2 Ti, Fe 2 W, the μ phase contains Fe 7 Mo 6 ,Co 7 Mo 6 , Fe 7 W 6 ,Co 7 W 6 . In the present invention, the Laves phase and μ phase formed in situ during the sintering process are strengthened and hardened, and the fine μ is strengthened relative to the matrix, so that it has higher hardness at high temperature, and the Laves phase with high hardness and large particles endows the material with higher wear resistance. The intermetallic compound strengthening phase formed in situ has a good interface relationship with the matrix, and the diffusion rate is slow at high temperature, so the material can still maintain high strength, toughness and thermal conductivity while adding a large amount of alloying elements to achieve high hardness, and It has excellent tempering resistance, high temperature hardness and high temperature strength, and has better performance in high temperature and high speed cutting than traditional high speed steel.

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 Patents(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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