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A kind of preparation method and application of thin-wall quenching part inoculant

A technology of inoculant and quenching parts, applied in the field of inoculant and preparation of thin-walled quenching parts, can solve the problems such as the lack of performance of thin-walled quenching parts, the decrease of hardness of thin-walled quenching parts, and the increase of the cost of inoculant, so as to improve the casting parts. The effect of compactness and water pressure resistance, prolongation of inoculation decay time, and improvement of inoculation efficiency

Active Publication Date: 2017-04-19
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

[0025] Embodiment 1 (preparation inoculant)

[0026] Raw materials of 70% Si, 1% Sr, 3% Ba, 1.4% Al, 0.7% Ca, 0.5% recarburizer and 23.4% Fe and unavoidable trace elements are mixed evenly by weight Then put it into a vacuum electric furnace, replace the air in the furnace with argon, raise the temperature to 1300°C, smelt for 5 minutes, keep stirring during the melting process, so that the raw materials are mixed evenly; pour in the container, and place the container in liquid nitrogen, The alloy raw material is rapidly cooled to room temperature to form a block, and the block is crushed into an alloy powder 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 to form agglomerates, and finally crushed to an average particle size of 200 μm. Among them, the components of the recar...

Embodiment 2

[0027] Embodiment 2 (preparation inoculant)

[0028] Raw materials of 80% Si, 0.6% Sr, 0.5% Ba, 0.9% Al, 0.1% Ca, 1% recarburizer and 16.9% Fe and unavoidable trace elements are mixed evenly by weight Then put it into a vacuum electric furnace, replace the air in the furnace with argon, raise the temperature to 1500°C, melt for 10 minutes, stir continuously during the melting process, so that the raw materials are mixed evenly; pour in the container, and place the container in liquid nitrogen, The alloy raw material is rapidly cooled to room temperature to form a block, and the block is crushed into an alloy powder with an average particle size of 100 μm; the above-mentioned alloy powder obtained and an average particle size of 0.5% Fe 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 of 3% of the total weight of the powder is added together into a roller compacting device and pressed into agglomerates, and...

Embodiment 3

[0029] Embodiment 3 (preparation inoculant)

[0030] Raw materials of 72% Si, 0.9% Sr, 2.5% Ba, 1.1% Al, 0.2% Ca, 0.6% recarburizer and 22.7% Fe and unavoidable trace elements are mixed evenly by weight Then put it into a vacuum electric furnace, replace the air in the furnace with argon, raise the temperature to 1400°C, and melt for 6 minutes. Stir continuously during the melting process to mix the raw materials evenly; pour in a container, and place the container in liquid nitrogen. The alloy raw material is rapidly cooled to room temperature to form a block, and the block is crushed into an alloy powder 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 of 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. Among them, the components of the recarburiz...

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Abstract

The invention discloses a preparation method of an inoculant for a thin-wall quenching part. The preparation method comprises the following steps: uniformly mixing 70-80% of Si, 0.6-1% of Sr, 0-3% of Ba, 0.9-1.4% of Al, 0-0.7% of Ca, 0.5-1% of a carburant and the balance of Fe and inevitable trace elements to obtain a mixture; smelting, cooling, pouring, quenching and crushing the mixture; mixing the mixture with Fe3O4 powder; and pressing, clustering and crushing the mixture and the Fe3O4 powder. The invention further discloses an application of the inoculant for the thin-wall quenching part. The inoculant for the thin-wall quenching part provided by the invention can be adopted to improve comprehensive properties of the thin-wall quenching part, and improves inoculation efficiency.

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 Patents(China)
IPC IPC(8): C22C33/08C22C37/10B22D1/00C21C1/08
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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