A kind of sic/m2 powder high-speed steel composite material and preparation method thereof

A technology of composite materials and high-speed steel, which is applied in the field of SiC/M2 powder high-speed steel composite materials and its preparation, can solve problems such as inability to achieve 100% alloying, metal powder surface oxidation, long ball milling time, etc., and achieve the elimination of ball milling alloys process, realize alloying, reduce cost and density

Active Publication Date: 2021-01-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of ball milling alloying are surface oxidation of metal powder and powder contamination by ball milling media
In addition, the alloying of carbide and metal powder requires a long time for ball milling, consumes a lot of electric energy, and cannot achieve 100% alloying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing SiC / M2 high-speed steel composite material, comprising the following steps and process conditions:

[0038] Step 1: SiC powder surface coating treatment

[0039] Select SiC powder with a particle size of ≤1 μm, wherein the volume fraction of SiC powder less than 200nm is 10%, and then chrome-plate the particle surface;

[0040] Step 2: Pre-alloyed SiC / M2 high-speed steel composite powder preparation

[0041] The end temperature of vacuum smelting M2 high speed steel is 1640°C, the atomization temperature of molten steel is 1590°C; the composition and mass percentage of molten steel: C0.85%, Si0.35%, Mn0.28%, W5.12%, Mo5.03 %, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0042] Put the coated SiC powder in step 1 into a separate sending tank, use argon to transport it to the atomizer, and form a gas-powder mixed atomization medium with the atomization gas (argon), and then atomize molten steel. SiC / M2 high speed s...

Embodiment 2

[0052] A preparation method of SiC / M2 powder high-speed steel composite material, specifically comprising:

[0053] Step 1: SiC powder surface coating treatment

[0054] Select SiC powder with a particle size of ≤1 μm, wherein the volume fraction of SiC powder less than 200nm is 14%, and then chrome-plate the particle surface;

[0055] Step 2: Pre-alloyed SiC / M2 high-speed steel composite powder preparation

[0056] The end temperature of vacuum smelting M2 high speed steel is 1640°C, the atomization temperature of molten steel is 1590°C; the composition and mass percentage of molten steel: C0.85%, Si0.35%, Mn0.28%, W5.12%, Mo5.03 %, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0057] Put the coated SiC powder in step 1 into a separate sending tank, use argon to transport it to the atomizer, and form a gas-powder mixed atomization medium with the atomization gas (argon) (the powder is evenly dispersed in it) , and then atomized molten steel t...

Embodiment 3

[0066] A preparation method of SiC / M2 powder high-speed steel composite material, specifically comprising:

[0067] Step 1: SiC powder surface coating treatment

[0068] Select SiC powder with a particle size of ≤1 μm, wherein the volume fraction of SiC powder less than 200nm is 20%, and then chrome-plate the particle surface;

[0069] Step 2: Pre-alloyed SiC / M2 high-speed steel composite powder preparation

[0070] The end temperature of vacuum smelting M2 high speed steel is 1640°C, the atomization temperature of molten steel is 1590°C; the composition and mass percentage of molten steel: C0.85%, Si0.35%, Mn0.28%, W5.12%, Mo5.03 %, Cr3.85%, V1.99%, the balance Fe, containing unavoidable impurity elements;

[0071] Put the coated SiC powder in step 1 into a separate sending tank, use argon to transport it to the atomizer, and form a gas-powder mixed atomization medium with the atomization gas (argon) (the powder is evenly dispersed in it) , and then atomized molten steel t...

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Abstract

The invention relates to a SiC / M2 powder high-speed steel composite material. The composite material has a relative density of greater than 99% and hardness of 66-69HRC, and comprises nano-scale enhanced-phase particles SiC, submicron-scale hard-phase SiC and separated submicron-scale M6C type composite carbide, wherein the average particle size of the enhanced-phase particles SiC is 200nm, and the particle sizes of the hard-phase SiC and the M6C type composite carbide are not greater than 1[mu]m; and the matrix of the composite material is M2 high-speed steel, the particles SiC are uniformly distributed into the matrix in a dispersed manner as additional mass points, the composite material comprises the following raw material components with contents by volume percent: 85%-90% of M2 high-speed steel and 10%-15% of the particles SiC, the volume fraction of the particles SiC with particle sizes of not greater than 200nm in the particles SiC is 10%-20%, and the balance is particles with particle sizes of greater than 200nm and less than 1[mu]m. A preparation technology for a pre-alloyed composite powder is beneficial to obtaining the composite powder with a small and uniform particle size, preventing the agglomeration of the powder SiC, and realizing adequate alloying for the particles SiC and the matrix powder.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a SiC / M2 powder high-speed steel composite material and a preparation method thereof. Background technique [0002] In the prior art, the high-speed steel used to make cutting tools is mainly tungsten-molybdenum high-speed steel M2, and its chemical composition is expressed in weight percentage (%), respectively C: 0.80~0.90, W: 5.50~6.75, Mo: 4.50~ 5.50, Cr: 3.80~4.40, V: 1.75~2.20, Mn: 0.15~0.40, Si: ≤0.40, S: ≤0.03, P: ≤0.03, the balance is Fe, tungsten-molybdenum high-speed steel M2 after quenching and tempering The hardness is 65±1HRC, which can meet the processing requirements of normalized steel materials with a hardness below 270HB. However, in order to reduce the weight of mechanical parts, improve the strength of parts, and prolong the life of parts, the steel materials have gradually changed from normalized state to modulated state. , The processing hardness of the corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/02C22C38/04C22C38/22C22C38/24C21D6/00C21D1/18B22F9/08
CPCB22F9/082C21D1/18C21D6/002C21D6/005C21D6/008C22C33/0228C22C33/0292C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 康磊廖相巍贾吉祥李广帮郭庆涛唐雪峰黄玉平康伟王超逸吕春风
Owner ANGANG STEEL CO LTD
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