CN102051537B - Damp white iron material and preparation method thereof - Google Patents

Abstract

The invention discloses a damp white iron material and a preparation method thereof. The material takes damp white iron as a substrate; a steel wire cluster and carbon fiber are distributed in the substrate; the diameter of the steel wire cluster is 10-15cm, the section of the steel wire is rectangular, and the standard of the section is (0.1-0.4mm)*(0.5-1.5mm); and the weight ratio of the steel wire to the carbon fiber is (25-30):1, and the steel wire and carbon fiber account for 20-40% of material by volume percent. The damp white iron material prepared by the method has the advantages of high toughness, simple process and low cost.

Description

A kind of damping white iron material and preparation method thereof

technical field

The invention belongs to the field of metal materials, and relates to a damping white iron material, in particular to a damping white iron material reinforced by steel wire clusters and carbon fibers and a preparation method thereof.

Background technique

In the field of metal materials, damping white iron has been widely valued as a low-cost wear-resistant material.

CN200810243269.7 application discloses a low-alloy white cast iron, its chemical composition is: carbon 3.5-3.8%, silicon 1.5-1.9%, manganese greater than 0, less than or equal to 1.0%, phosphorus less than 0.05%, sulfur less than 0.02% , chromium is greater than 0 and less than or equal to 1.0%, and the balance is iron and unavoidable trace impurity elements; the unit is percentage by weight.

CN201010158988.6 application discloses a high-toughness and wear-resistant white iron, its chemical composition is (weight percent): C: 2.0-4.0%, Si: 1.0-2.5%, Mn: 0.2-0.8%, Cr: 1.0 ～15.0%, Ni: 2.0～8.0%, Mo: 0.1～0.4%, Dy: 0.1～0.2%, Y: 0.1～0.2%, S and P≤0.06%, and the rest is Fe. This application also discloses a preparation method of the above-mentioned high-toughness and wear-resistant white iron. In this invention, by adding Zr and Y elements to white iron, the oxide particles of Dy and Y elements are dispersed in the matrix and become the nucleation core of carbon compounds, thereby achieving the purpose of refining carbides and making the grain boundaries The network carbide is eliminated, αk reaches about 10J/cm ² , and the hardness of ordinary white iron can be maintained, and the HRC reaches more than 60.

But white iron is mainly composed of cementite, which is hard but brittle. Although the addition of rare earth can refine the carbide, it is limited to improve the toughness of the material.

CN93103016.1 invented high-damping cast iron using common smelting methods, casting into pipes, rods and billets of various shapes, in cast iron with carbon equivalent CE=C%+1/3(Si%)=4.5～5.2%, Adding 0.001-0.100% of yttrium makes it have high damping property and low cost, and can be used as a structural material in electromechanical products to achieve the effect of vibration reduction and noise reduction. However, the wear resistance of this material is insufficient, and it cannot have high wear resistance and damping performance at the same time.

Contents of the invention

The object of the present invention is to provide a damping white iron material reinforced by composite reinforcement of steel wire clusters and carbon fibers for the above-mentioned technical defects.

Another object of the present invention is to provide a method for preparing a damping white iron material reinforced by composite reinforcement of steel wire clusters and carbon fibers.

The purpose of the present invention is achieved by the following technical solutions:

A damping white iron material, the material uses damping white iron as a matrix, and steel wire clusters and carbon fibers are distributed in the matrix; the steel wire clusters have a diameter of 10-15 cm, and the cross-section of the steel wire used is rectangular, and the cross-sectional specification is 0.1-0.4 mm×0.5～1.5mm; the weight ratio of the steel wire and carbon fiber is 25～30:1, and the volume percentage of steel wire and carbon fiber is 20-40%;

The weight percentage of the chemical composition of the damping white iron matrix is: C is 2.4-2.7%, Si is 1.4-1.9%, Mn is 0.5-0.7%, P<0.08%, S<0.25%, and the rest is Fe;

The weight percentage of the chemical composition of the steel wire is: C is 0.6-0.7%, Si is 0.2-0.3%, Mn is 0.3-0.8%, P<0.02%, S<0.025%, and the rest is Fe;

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 100-500:1.

Mn ₄ B, Fe ₃ B and B ₄ C particles are also distributed in the above matrix.

A preparation method of damping white iron material, it comprises the following steps:

Preparation of boronized steel wire balls and carbon fibers: the cross-section size is 0.1-0.4mm×0.5-1.5mm, the composition is 0.6-0.7% for C, 0.2-0.3% for Si, 0.3-0.8% for Mn, P<0.02% , S <0.025%, the rest is steel wire of Fe, and T300 carbon fiber with a diameter of 7 microns and an aspect ratio of 100 to 500:1; the weight ratio of the steel wire to carbon fiber is 25 to 30:1; both steel wire and carbon fiber The total volume percentage of the material is 20-40%; take the steel wire and prepare a clean spherical steel wire cluster according to the conventional method of cleaning ball production. Boronized steel wire cluster; the thickness of the boronized layer is 50-100 μm;

Preparation of boronized steel wire clusters to adhere to carbon fibers: immerse boronized steel wire clusters in water glass solution, the concentration of water glass solution is 1.3-1.5g/cm ³ , and the modulus is 2.6-3.0; take out the steel wire clusters from the water glass solution , and then sprinkle the carbon fibers onto the steel wire balls with water glass solution, so that the carbon fibers evenly stick to the surface of the steel wires; The degree of tightness is determined by the volume percentage of the steel wire ball and carbon fiber, and the steel wire ball is guaranteed to fill the mold; then the upper mold of the mold is covered on the lower mold, and the molten iron is poured after the box is closed;

Preparation of damping white iron matrix: by weight percentage, C is 2.4-2.7%, Si is 1.4-1.9%, Mn is 0.5-0.7%, P<0.08%, S <0.25%, and the rest is Fe for batching; The damping white iron matrix is melted in an induction furnace to obtain damping white iron, and the melting temperature is 1420-1450°C;

The above-mentioned damping white iron is poured into a casting mold with steel wire clusters adhered to carbon fibers. The liquid molten iron enters the gap between the steel wire clusters to surround the carbon fibers and steel wires, and then cools and solidifies to form a damping white iron matrix with carbon fibers distributed in it. and wire ball materials.

The beneficial effects of the present invention compared with prior art are as follows:

(1) The steel wire and carbon fiber in the material of the present invention have considerable strength and high toughness, and the steel wire and the white iron matrix are all iron, so the steel wire and the white iron matrix are easy to combine to form a good metallurgical combined. In this way, the steel wire is distributed in the white iron, which has a good strengthening and toughening effect on the material.

(2) Carbon fiber is distributed in the material of the present invention, and the carbon fiber not only has the function of reducing friction, but also works together with the steel wire to enhance the toughness and strength of the material, so it is beneficial to improve the wear resistance of the alloy.

(3) During the forming process of the material, when the molten iron enters the mold cavity and contacts the steel wire, the B on the surface of the steel wire melts in the molten iron, and the Mn, C and Fe in the molten iron react with the B on the surface of the steel wire to form Mn ₄ B, Fe ₃ B, B ₄ C, the formed dispersion compound is distributed in the matrix, which makes the hardness of the material high, thereby improving the wear resistance of the material.

(4) Damping in the material The white iron material contains hard steel wires, and the alloy contains dispersed borides, so it has high hardness and good wear resistance.

(5) At the same time, the cross-section of the steel wire in the material is rectangular and contains fine carbon fibers, so there are many interfaces in the alloy and the surface area is large, which makes the material have good damping and vibration reduction performance; The carbon fibers attached to it are evenly distributed in the material.

(6) The material of the present invention does not use precious elements, the main alloying elements are brought in by steel wire, the cost of steel wire material is low, the cost of carbon fiber is also low, the preparation process is simple, the performance of the produced alloy material is good, and it is very convenient for industrial production. The prepared materials are mainly used for wear-resistant and vulnerable parts used in industrial fields such as mines, coal, and building materials, such as cylinder liners and end liners.

(7) P and S in the material of the present invention are impurities, which should be controlled within the allowable range.

The material properties of the present invention are shown in Table 1.

Description of drawings

Fig. 1 is the metallographic structure of the damping white iron material reinforced by composite reinforcement of steel wire clusters and carbon fibers prepared in Example 1 of the present invention.

Figure 1 shows that the combination of damping white iron and steel wire is good.

Detailed ways

The following examples are only used to illustrate the present invention, and the weight percentages can be replaced by weight g, kg or other weight units. The steel wires and carbon fibers in each embodiment are commercially available, and the boronizing layer is self-made.

Embodiment one

The weight percentage of the chemical composition of the damping white iron matrix: C is 2.4%, Si is 1.4%, Mn is 0.5%, P<0.08%, S<0.25%, and the rest is Fe. the

The weight percentage of the chemical composition of the steel wire is: C is 0.6%, Si is 0.2%, Mn is 0.3%, P<0.02%, S<0.025%, and the rest is Fe; the cross section of the steel wire is rectangular, and the specification is 0.1 mm×0.5mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 100:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 20% of the material.

Get steel wire and form the steel wire group of clean ball shape according to the conventional method of cleaning ball or steel wire ball production, the diameter of steel wire group is 10cm, and obtain boronized steel wire group by boronizing on its surface by conventional chemical heat treatment method, described boronizing layer The thickness is 50 μm.

The preparation process is as follows: immerse the boronized steel wire ball into the water glass solution, the concentration of the water glass solution is 1.3 g/cm ³ , and the modulus is 2.6; the steel wire ball is taken out of the water glass solution, and then the carbon fiber is kneaded and sprinkled on the On the steel wire ball with water glass solution, the carbon fiber is evenly adhered to the surface of the steel wire; after the water glass is solidified, put some steel wire balls with carbon fiber into the mold cavity; the tightness of the steel wire ball is determined by the steel wire and carbon fiber. The volume percentage of the material is determined, and it is ensured that the steel wire ball is just filled with the mold; then the upper mold of the mold is covered on the lower mold, and the molten iron is poured after the box is closed;

The damping white iron matrix is melted in an induction furnace to obtain damping white iron, and the melting temperature is 1430-1440°C;

The above-mentioned damping white iron molten iron is poured into the casting mold equipped with steel wire clusters with carbon fibers, and the liquid molten iron enters the gap between the steel wire clusters to surround the carbon fibers and steel wires, and then cools and solidifies to form a damping white iron matrix in which carbon fibers are distributed. and wire ball materials.

Embodiment two

The weight percentage of the chemical composition of the damping white iron matrix: C is 2.7%, Si is 1.9%, Mn is 0.7%, P<0.08%, S<0.25%, and the rest is Fe. the

The weight percentage of the chemical composition of the steel wire is: C is 0.7%, Si is 0.3%, Mn is 0.8%, P<0.02%, S<0.025%, and the rest is Fe; the cross section of the steel wire is rectangular, and the specification is 0.4 mm×1.5mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 500:1.

The weight ratio of steel wire and carbon fiber is 30:1, and the volume percentage of the control steel wire and carbon fiber is 40% of the material.

Get steel wire to form the steel wire group of clean ball shape according to the conventional method of cleaning ball production, the diameter of steel wire group is 15cm, and obtain boronized steel wire group at its surface boronizing by conventional chemical heat treatment method, the thickness of described boronizing layer is 100 μm.

The preparation process is the same as in Example 1, wherein the concentration of the water glass solution is 1.5 g/cm ³ and the modulus is 3.0.

Embodiment three

The weight percentage of the chemical composition of the damping white iron matrix: C is 2.6%, Si is 1.6%, Mn is 0.6%, P<0.08%, S<0.25%, and the rest is Fe. the

The weight percentage of the chemical composition of the steel wire is: C is 0.65%, Si is 0.25%, Mn is 0.5%, P<0.02%, S<0.025%, and the rest is Fe; the cross section of the steel wire is rectangular, and the specification is 0.3 mm×0.7mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 190:1.

The weight ratio of steel wire and carbon fiber is 27:1, and the volume percentage of the control steel wire and carbon fiber is 35% of the material.

Get steel wire to form the steel wire group of cleaning ball shape according to the conventional method of cleaning ball production, the diameter of steel wire group is 12cm, and obtain boronized steel wire group at its surface boronizing by conventional chemical heat treatment method, the thickness of described boronizing layer is 70 μm.

The preparation process is the same as in Example 1, wherein the concentration of the water glass solution is 1.4 g/cm ³ and the modulus is 2.8.

Comparative Example Four

The weight percentage of the chemical composition of the damping white iron matrix: C is 2%, Si is 1%, Mn is 0.4%, P<0.08%, S<0.25%, and the rest is Fe. the

The weight percent of the chemical composition of the steel wire is: C is 0.3%, Si is 0.1%, Mn is 0.2%, P<0.02%, S<0.025%, and the rest is Fe; the cross section of the steel wire is circular, and The radius is 0.1mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 50:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 10% of the material.

Get steel wire and form the steel wire group of cleaning ball shape according to the conventional method of cleaning ball production, and the diameter of steel wire group is 10cm, and the surface of steel wire group is not boronized.

The preparation process is the same as in Example 1.

Comparative example five

The weight percentage of the chemical composition of the damping white iron matrix: C is 2.8%, Si is 2%, Mn is 0.8%, P<0.08%, S<0.25%, and the rest is Fe. the

The weight percentage of the chemical composition of the steel wire is: C is 0.9%, Si is 0.4%, Mn is 0.9%, P<0.02%, S<0.025%, and the rest is Fe; the cross section of the steel wire is rectangular, and the specification is 0.5 mm×2mm.

The carbon fiber is T300 with a diameter of 7 microns and an aspect ratio of 600:1.

The weight ratio of the steel wire and the carbon fiber is 25:1, and the volume percentage of the control steel wire and the carbon fiber is 60% of the material.

Get steel wire and form the steel wire group of clean ball shape according to the conventional method of cleaning ball production, the diameter of steel wire group is 10cm, and obtain boronized steel wire group at its surface boronizing by conventional chemical heat treatment method, the thickness of described boronizing layer is 200 μm.

The preparation process is the same as in Example 1.

Product performance analysis:

As can be seen from the following table, the increase of C, Si and Mn in the white iron matrix and steel wire chemical composition in the material of the present invention is beneficial to the improvement of material hardness. But too much will reduce the toughness of the matrix material. The increase of P and S will also reduce the toughness of the matrix material.

The cross-section of the steel wire is rectangular to facilitate the bonding of carbon fibers. If the cross-sectional size is too small, it is not conducive to bonding carbon fibers; on the contrary, if the size is too large, the tendency to split the matrix increases.

Too small or too large carbon fiber aspect ratio is not conducive to bonding with rectangular cross-section steel wire.

The increase in the volume percentage of steel wire and carbon fiber is conducive to the improvement of material toughness. However, if the volume percentage is too large, the hardness of the material will be reduced, thus reducing the wear resistance of the material, such as product 5, and the molten iron is not easy to surround steel wire and carbon fiber; on the contrary, if the volume percentage of steel wire and carbon fiber in the material is too small, then It is not conducive to the effect of steel wire and carbon fiber.

The increase of the thickness of the boronizing layer on the surface of the steel wire is beneficial to the alloying of molten iron; but if the thickness is too large, boron is not easy to melt into the molten iron in a short time, resulting in waste of elements and an increase in heat treatment costs; on the contrary, the thickness of the boronizing layer on the surface of the steel wire is too large Small, the steel wire hardness is reduced, and it is not conducive to the formation of dispersed compounds.

The performance comparison of each product obtained in table 1

Claims (1)

1. damping white pig iron preparation methods, it is characterized in that: it may further comprise the steps:

The preparation of boronising steel wire and thomel: getting the cross section specification is that 0.1～0.4mm * 0.5～1.5mm, composition are that C is 0.6～0.7%; Si is 0.2～0.3%; Mn is 0.3～0.8%, and < 0.02%, S < 0.025% for P; All the other are the steel wire of Fe, and diameter is the T300 thomel that 7 microns length-to-diameter ratios are 100～500:1; The weight ratio of said steel wire and thomel is 25～30:1; The volume percent that steel wire and thomel account for material altogether is 20～40%; Get the ordinary method preparation cleaning globular steel wire group that steel wire is produced by cleaning ball, the diameter of steel wire group is 10～15cm, and obtains boronising steel wire group by the conventional chemical heat-treating methods at its surface boronizing; The thickness of said boride layer is 50-100 μ m;

Boronising steel wire group adheres to the preparation of thomel: water glass solution is immersed in group with the boronising steel wire, and the concentration of water glass solution is 1.3～1.5g/cm ³, modulus is 2.6～3.0; Steel wire group is taken out from water glass solution, and then thomel rubbed spread in the steel wire group that has water glass solution, make thomel evenly be bonded at the surface of steel wire; After treating that water glass solidifies, the steel wire group of some adhesion thomels is put into the casting mold die cavity; The tightness of steel wire group accounts for the volume percent decision of material altogether by steel wire group and thomel, and guarantees that steel wire group just in time piles casting mold; Mo(u)ld top half with casting mold is placed on the mo(u)ld bottom half then, waits for molten iron pouring after mould assembling finishes;

The preparation of damping white pig iron matrix: percentage composition C is 2.4～2.7% by weight, and Si is 1.4～1.9%, and Mn is 0.5～0.7%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P; Damping white pig iron matrix melted in induction furnace obtain damping spoken parts in traditional operas molten iron, temperature of fusion is 1420～1450 ℃;

Above-mentioned damping spoken parts in traditional operas molten iron is poured in the casting mold that the steel wire group that adheres to thomel is housed; Liquid molten iron gets into steel wire group gap thomel and steel wire is surrounded; Cooled and solidified then, form with damping white pig iron be matrix wherein be distributed with the material that thomel and steel wire are rolled into a ball.

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