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Amorphous nucleating agent for gray pig iron and preparation method and using method thereof

An inoculant and gray cast iron technology, which is applied in the field of cast iron alloys, can solve the problems of incomplete modification, increased material cost, poor casting strength improvement effect, etc., to reduce the solidification temperature range, reduce the interface energy, and increase the nucleation rate. Effect

Active Publication Date: 2017-05-31
石卫东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of alloying elements increases the cost of materials
[0005] The commonly used inoculants are fine-grained materials, blocks or prefabricated blocks made of powder and binder, and there is a practical problem that the modification is not complete, especially the improvement effect on the strength of castings is poor.

Method used

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  • Amorphous nucleating agent for gray pig iron and preparation method and using method thereof
  • Amorphous nucleating agent for gray pig iron and preparation method and using method thereof
  • Amorphous nucleating agent for gray pig iron and preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition of each element weight percentage of type 1 amorphous inoculant is:

[0039] 72 Si, 2.0 Al, 2.0 Mn, 4.0 Cr, 0.4 Cu, the balance being Fe; or: 74 Si, 1.5 Al, 1.0 Mn, 2.0 Cr, and the balance being Fe; or It is: 76 Si, 0.8 Al, 0.1 Cu, and the balance is Fe.

[0040] The preparation method of type 1 amorphous inoculant:

[0041] Put the type 1 amorphous inoculant alloy with a particle size of 2-8mm into the water-cooled copper crucible of the vacuum quenching furnace, adjust the position of the electrode so that the distance between it and the raw material alloy particles in the crucible is 0.5-1.5mm, close Furnace door, material inlet and outlet, and air release valve, after vacuuming to 3-4×10-3Pa, fill with protective gas argon, and the pressure of the vacuum quenching furnace can be kept within the range of -0.04~-0.06Pa. After the arc is started, the arc current is adjusted to gradually increase to 650-800A, and the raw material alloy in the crucible ...

Embodiment 2

[0046] The composition of each element weight percentage of type 2 amorphous inoculant is:

[0047] 45% Si, 2.0% Al, 2.0% Mn, 0.4% Cu, the balance is Fe; or: 47% Si, 1.5% Al, 1.0% Mn, the balance is Fe; or: 50% Si, 0.8% Al, 0.1 of Cu, and the balance of Fe.

[0048] The preparation method and usage method of Type 2 amorphous inoculant are the same as in Example 1.

[0049] image 3 middle, image 3 a is the graphite form of the sample without adding the inoculant of Example 2, the average length of graphite is 146.73 μm, image 3 b is the graphite form of the sample added with Type 2 amorphous inoculant (the second composition of Example 2), and the average length of graphite is 106.34 μm.

Embodiment 3

[0051] The composition of each element weight percentage of Type 3 amorphous inoculant is:

[0052] 60% Si, 3.0% Al, 7.0% Zr, 2.0% Mn, 0.4% Cu, and the balance is Fe; or: 65% Si, 2.0% Al, 6.0% Zr, 1.0% Mn, and the balance is Fe; or It is: 70 Si, 0.8 Al, 5.0 Zr, 0.1 Cu, and the balance is Fe.

[0053] The preparation method and usage method of Type 3 amorphous inoculant are the same as in Example 1.

[0054] Figure 4 middle, Figure 4 a is the graphite form of the sample without adding the inoculant of Example 3, the average length of graphite is 138.69 μm, Figure 4 b is the graphite form of the sample added with Type 3 amorphous inoculant (the third composition in Example 3), and the average length of graphite is 98.66 μm.

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Abstract

The invention discloses an amorphous nucleating agent for gray pig iron and a preparation method and using method thereof. The amorphous nucleating agent comprises, by weight, 45-78% of Si, 0.8-3% of Al, 0-1% of Sr, 0-6% of Ba, 0-7% of Zr, 0-2% of Mn, 0-4% of Cr, 0-0.4% of Cu, and the balance Fe. The amorphous nucleating agent is prepared through a rapid cooling method which is different from process conditions of the prior art, and the adding amount of the amorphous nucleating agent is 0.03-0.12wt% of a gray pig iron solution of a pouring ladle. The amorphous nucleating agent can increase the eutectic cell number of the gray pig iron, and graphite flakes are shorter; and comparison shows that the eutectic cell number is increased by 50% or more compared with common gray pig iron, the graphite flakes are shortened by 30% or more, and the tensile strength can be increased by 15% or more.

Description

technical field [0001] The invention belongs to cast iron alloys, in particular to an amorphous inoculant for gray cast iron, a preparation method and a use method thereof. Background technique [0002] Gray cast iron has good wear resistance, shock absorption and machinability, and has high compressive strength, so it is widely used in industry. [0003] Since the carbon in gray cast iron is mainly distributed in the metal matrix in the form of flake graphite, its fracture is dark gray, so gray cast iron can be regarded as a steel matrix plus flake graphite. Since the strength of graphite is extremely small relative to the metal matrix, the structure of gray cast iron can be regarded as many "cracks" on the steel matrix, so its tensile strength, plasticity and impact toughness have limits. Therefore, improving the performance of gray cast iron has become the goal pursued by the foundry industry. [0004] At present, the main methods to improve the performance of gray cast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/08C22C33/08
CPCC21C1/08C22C33/08
Inventor 石卫东刘清信王晶宋文涛
Owner 石卫东
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