Preparation process for nanoparticle reinforced die steel

A nanoparticle and preparation technology, applied in the field of die steel, can solve the problems of restricting the development and application of metal matrix nanocomposites, research vacancies of metal matrix-nanocomposites, uneven distribution of second phase or reinforcement phase, etc., to achieve shortening The time and cost of nanometerization are low, and the effect of improving the efficiency of ball milling

Inactive Publication Date: 2012-02-22
JIANGSU YINYU MOLD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In situ synthesis technology can overcome the problems of poor wetting between the matrix and the second phase or reinforcement, interface reaction to produce a brittle layer, uneven distribution of the second phase or reinforcement phase, etc., so it has great potential in the development of new metal matrix nanocomposites. potential, but the current research work is more focused on aluminum-based composites, and research on in-situ synthesis of iron-based composites is receiving more and more attention
Due to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] in Cr 12 MoV cold work die steel is modified by adding nanoparticles. Cr 12 The chemical composition of MoV cold work die steel is C1.45~1.70, Cr4.75~5.5, Mo0.40~0.60, Si2 / Al 2 o 3 The size of the nanoparticles is 100nm, and the added amount is 1.5% by weight. The preparation process is:

[0041] 1) In situ synthesis of nanoparticle prefabricated block preparation process:

[0042] The industrial Ti powder with a purity greater than or equal to 99% and a particle size of less than 800 μm, the industrial Al powder, silicon nitride powder and graphite powder with a purity greater than or equal to 99% and a particle size of less than 400 μm, are prepared in proportions of Si 3 N 4 The molar ratio of Ti:Al:C is 2:(40.2~13.4):(13.5~3.7):(20.43~3.9), and Al with a particle size of 300nm is added according to 5%~10 of the total weight of the above powder 2 o 3 , to promote the nanometerization of powder, shorten the time of nanometerization, improve the efficiency of ...

Embodiment 2

[0050] Adding nanoparticles to H13 hot work die steel for modification. The chemical composition of H13 hot work die steel is C 0.31~0.45, Cr4.75~5.5, Mo1.10~1.75, Si0.81~1.20, V0.80~1.20, Mn2 / Al 2 o 3 The nanoparticle size is 50nm, and the added amount is 2.5% by weight. The preparation process is:

[0051] 1) In situ synthesis of nanoparticle prefabricated block preparation process:

[0052] The industrial Ti powder with a purity greater than or equal to 99% and a particle size of less than 800 μm, the industrial Al powder, silicon nitride powder and graphite powder with a purity greater than or equal to 99% and a particle size of less than 400 μm, are prepared in proportions of Si 3 N 4 The molar ratio of Ti:Al:C is 2:(40.2~13.4):(13.5~3.7):(20.43~3.9), and Al with a particle size of 300nm is added according to 5%~10 of the total weight of the above powder 2 o 3 , to promote the nanometerization of powder, shorten the time of nanometerization, improve the efficiency ...

Embodiment 3

[0060] at W 6 Mo 5 Cr 4 V 2 Adding nanoparticles to high-speed steel for modification and strengthening. W 6 Mo 5 Cr 4 V 2 The chemical composition of high-speed steel is C0.80~0.90, Cr3.80~4.40, W4.50~5.50, Mo5.50~6.75, Si2 / Al 2 o 3 The size of the nanoparticles is 70nm, and the added amount is 0.7% by weight.

[0061] 1) In situ synthesis of nanoparticle prefabricated block preparation process:

[0062] The industrial Ti powder with a purity greater than or equal to 99% and a particle size of less than 800 μm, the industrial Al powder, silicon nitride powder and graphite powder with a purity greater than or equal to 99% and a particle size of less than 400 μm, are prepared in proportions of Si 3 N 4 The molar ratio of Ti:Al:C is 2:(40.2~13.4):(13.5~3.7):(20.43~3.9), and Al with a particle size of 300nm is added according to 5%~10 of the total weight of the above powder 2 o 3 , to promote the nanometerization of powder, shorten the time of nanometerization, impr...

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Abstract

The invention discloses a preparation process for nanoparticle reinforced die steel. The process comprises the following steps of: performing pre-dispersion mixing on in-situ synthesized TiNC/Si3N4 nano mixed powder and pre-dispersion iron powder, preparing a dispersed precast block, adding the precast block into a steel ladle, synthesizing the precast block into TiNC/Si3N4/Al2O3 mixed nanoparticles in molten steel in situ by using the high-temperature molten steel, uniformly dispersing the TiNC/Si3N4/Al2O3 nanoparticle mixed powder in a die steel matrix by using an electromagnetic agitator and forming the die steel by adopting a casting method. By the preparation process, the in-situ synthesized nanoparticles are adopted, so the wettability of the nanoparticles and the matrix is improved; and the die steel with uniformly distributed nanoparticles is obtained by secondary dispersion and electromagnetic agitating processes, so the die steel is modified and reinforced. The volume fraction of the nanoparticles is regulated by regulating the addition of the nanoparticles, so the requirements of different working conditions can be met. The nano modified die steel with high abrasive resistance has high mechanical properties, and is simple in preparation and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of die steel, and relates to a preparation method of nano powder reinforced die steel, in particular to a preparation process of nano particle reinforced die steel. Background technique [0002] With the development of modern mechanical equipment and manufacturing technology, higher and more stringent performance requirements are put forward for the performance and quality of parts. Traditional die steel materials are made by adding a certain amount of alloy elements into molten steel , so that a certain amount of primary carbides are formed during the solidification process, and a certain amount of secondary carbides are precipitated by heat treatment, so that the material can achieve wear resistance on the basis of maintaining a certain toughness. However, due to the limitation of the manufacturing process, the total amount of carbides is generally less than 20%. Due to the relatively small content of carb...

Claims

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Application Information

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IPC IPC(8): B22D19/14C22C33/00B22D27/20
Inventor 张新房丁刚丁家伟耿德英孙健陈小妹王伟浩
Owner JIANGSU YINYU MOLD MATERIAL
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