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Preparation method and application of inoculant for thin-wall quenched part

A technology of inoculants and quenching parts, which is applied in the field of inoculant and preparation of thin-walled quenching parts, can solve the problems of inability to obtain the performance of thin-walled quenching parts, decrease in hardness of thin-walled quenching parts, and increase the cost of inoculants, so as to improve castings The effects of compactness and water pressure resistance, prolonging the inoculation recession time, and improving inoculation efficiency

Inactive Publication Date: 2015-12-30
成都宏源铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most manufacturers use inoculants for thin-walled quenching parts as inoculants to produce thin-walled quenching parts, but these products have short incubation time, poor wear resistance, low hardness, low tensile strength, uneven cross-section, and easy to produce white spots. And other shortcomings, resulting in unstable products, unable to meet the requirements of some machine castings that require high hardness
[0005] In order to improve the above shortcomings, some manufacturers began to add other materials to the ferrosilicon inoculant to prepare composite inoculants, such as chromium, copper, etc. However, when adding the above materials, new problems will be introduced
For example, the addition of chromium will increase the probability of white structure formation, which will lead to a decrease in the hardness of thin-walled quenched parts. Adding copper will not only have no good effect on improving the performance of thin-walled quenched parts, but will greatly increase the cost of preparing inoculants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 (preparation inoculant)

[0021] The raw materials of 70% Si, 1% Sr, 3% Ba, 1.4% Al, 0.7% Ca and 23.9% Fe and unavoidable trace elements are mixed uniformly and placed in a vacuum electric furnace by weight percentage, Replace the air in the furnace with argon, heat up and smelt for 5 minutes, stir continuously during the melting process, mix the raw materials evenly, cool in vacuum to form a block, and crush the block into an alloy powder with an average particle size of 50 μm; Powder and 1.5% Fe by weight with an average particle size of 50 μm 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 5% of the total weight of the powder is added together into a roller compacting device, pressed into agglomerates, and finally crushed to an average particle size of 200 μm.

Embodiment 2

[0022] Embodiment 2 (preparation inoculant)

[0023] The raw materials of 80% Si, 0.6% Sr, 0.5% Ba, 0.9% Al, 0.1% Ca and 17.9% Fe and unavoidable trace elements are mixed uniformly and placed in a vacuum electric furnace by weight percentage, Replace the air in the furnace with argon, heat up and smelt for 10 minutes, and stir continuously during the melting process to mix the raw materials evenly, cool in vacuum to form a block, and crush the block into an alloy powder with an average particle size of 100 μm; the obtained above alloy Powder and 0.5% Fe by weight with an average particle size of 100 μm 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 3% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 500 μm.

Embodiment 3

[0024] Embodiment 3 (preparation inoculant)

[0025] The raw materials of 72% Si, 0.9% Sr, 2.5% Ba, 1.1% Al, 0.2% Ca and 23.3% Fe and unavoidable trace elements are mixed uniformly and placed in a vacuum electric furnace by weight percentage, Replace the air in the furnace with argon, heat up and smelt for 6 minutes, and stir continuously during the melting process to mix the raw materials evenly, cool in vacuum to form a block, and crush the block into an alloy powder with an average particle size of 80 μm; the obtained above alloy Powder and 1% Fe by weight with an average particle size of 80 μm 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 3% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 300 μm.

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Abstract

The invention discloses a preparation method of an inoculant for a thin-wall quenched part. The preparation method comprises the following steps: 70%-80% of Si, 0.6%-1% of Sr, 0-3% of Ba, 0.9%-1.4% of Al, 0-0.7% of Ca and the balance of Fe and inevitable trace elements are mixed, melted, stirred, cooled and ground, then a product is mixed with Fe3O3 powder, and the mixture is pressed into clusters and ground. The invention further discloses an application of the inoculant for the thin-wall quenched part. With application of the inoculant for the thin-wall quenched part, the combination property of the thin-wall quenched part can be improved, and the inoculation efficiency can be improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to an inoculant for a thin-walled quenching part and a preparation method thereof, as well as its application in the field of casting. Background technique [0002] The inoculant can promote graphitization, reduce the tendency of white mouth, improve the shape and distribution of graphite, increase the number of eutectic groups, refine the matrix structure, round the ductile iron graphite, reduce or eliminate chilling, and prevent free cementite on the surface Formation, uniform structure, improved mechanical properties and other advantages, it has been widely used in the field of casting. [0003] With the rapid development of material science and structural technology, thin-walled parts can have the characteristics of high strength, light weight, and high load-bearing capacity, and have been more and more widely used in industrial fields such as automobiles, national defense, and aerospace....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/08
Inventor 韩岗马银强林志国
Owner 成都宏源铸造材料有限公司
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