阅读说明：本技术 一种包含碳化钛基粉末冶金产品的复合铸造产品 (Composite cast product containing titanium carbide-based powder metallurgy product ) 是由 孙岗 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种包含碳化钛基粉末冶金产品的复合铸造产品,属于冶金技术领域。该产品中碳化钛基粉末冶金产品由如下按质量百分比计的成分烧结生成：48％～55％TiC、8.5％～9％Mn、2％Mo、1.5％～1.7％Ni、12％～13％C、余量为Fe。该冶金产品与基体材料通过熔铸工艺一次浇注成型,且冶金产品与基体材料之间形成弥散性的冶金熔合。本发明通过限定碳化钛基粉末冶金产品中的各成分配比关系,使其能与基体材料之间形成包覆结构碳化物,既能满足硬质冶金产品的硬度要求,又能增加硬质冶金产品与基体材料的润湿性,实现该冶金产品与基体材料之间的弥散性冶金熔合,满足产品耐磨性、牢固性要求,延长产品使用寿命。(The invention discloses a composite casting product containing a titanium carbide-based powder metallurgy product, belonging to the technical field of metallurgy. The titanium carbide-based powder metallurgy product is prepared by sintering the following components in percentage by mass: 48 to 55 percent of TiC, 8.5 to 9 percent of Mn, 2 percent of Mo, 1.5 to 1.7 percent of Ni, 12 to 13 percent of C and the balance of Fe. The metallurgical product and the base material are cast and molded at one time through a casting process, and dispersive metallurgical fusion is formed between the metallurgical product and the base material. According to the invention, by limiting the proportion relation of each component in the titanium carbide-based powder metallurgy product, a coating structure carbide can be formed between the titanium carbide-based powder metallurgy product and the base material, so that the hardness requirement of the hard metallurgy product can be met, the wettability of the hard metallurgy product and the base material can be increased, the dispersive metallurgy fusion between the metallurgy product and the base material can be realized, the requirements of the wear resistance and the firmness of the product can be met, and the service life of the product can be prolonged.)

1. A composite cast product comprising a titanium carbide-based powder metallurgy product, wherein the titanium carbide-based powder metallurgy product is produced by sintering the following components in percentage by mass:

the balance of Fe, the titanium carbide-based powder metallurgy product and the matrix material are cast and molded at one time through a casting process, and dispersive metallurgy fusion is formed between the titanium carbide-based powder metallurgy product and the matrix material.

2. The composite cast product comprising a titanium carbide-based powder metallurgy product according to claim 1, wherein the titanium carbide-based powder metallurgy product has a density of 6.4 to 6.6 and a hardness of HRA86 to 90.

3. The composite cast product comprising a titanium carbide-based powder metallurgy product according to claim 2, wherein the titanium carbide-based powder metallurgy product is produced by sintering the following components in mass percent: 55% of TiC, 9% of Mn, 2% of Mo, 1.7% of Ni, 12% of C and 20.3% of Fe, wherein the density of the titanium carbide-based powder metallurgy product is 6.4-6.5, and the hardness is HRA 88-90.

4. The composite cast product comprising a titanium carbide-based powder metallurgy product according to claim 2, wherein the titanium carbide-based powder metallurgy product is produced by sintering the following components in mass percent: 48% of TiC, 8.5% of Mn, 2% of Mo, 1.5% of Ni, 13% of C and 27% of Fe, wherein the density of the titanium carbide-based powder metallurgy product is 6.5-6.6, and the hardness is HRA 86-88.

5. The composite cast product comprising a titanium carbide-based powder metallurgy product according to claim 1, wherein the base material is a cast steel or alloy cast steel liquid material.

6. The composite cast product comprising a titanium carbide based powder metallurgy product according to any one of claims 1 to 5, wherein the method of producing the composite cast product comprises the steps of:

(1) placing the titanium carbide-based powder metallurgy product at a designated position of a die;

(2) pouring the well-smelted base material into a die in which the titanium carbide-based powder metallurgy product is positioned in a negative pressure environment, wherein the pouring temperature is 1500-1600 ℃;

(3) after the pouring is finished and the solidification is finished, quenching and tempering are carried out, and then the titanium carbide-based powder metallurgy product and the matrix material are generated to form a dispersed metallurgical fusion-fused composite fusion-cast product.

7. The composite casting product containing the titanium carbide-based powder metallurgy product according to claim 6, wherein after the pouring in the step (3), the negative pressure is stopped for 1-2 minutes, and the temperature is kept to be not lower than 1500 ℃ within 2 minutes; and rapidly starting negative pressure for 15-20 minutes to achieve rapid cooling.

8. The composite cast product comprising a titanium carbide-based powder metallurgy product according to claim 1, wherein the product is a railway or mining machinery equipment fitting.

Technical Field

The invention relates to the technical field of metallurgy, in particular to a composite casting product containing a titanium carbide-based powder metallurgy product.

Background

The product of the powder metallurgy process is a hard alloy material which is produced by stirring, briquetting and sintering hard element tungsten, titanium and other powder and cobalt molybdenum and other elements. The material has high hardness which can reach HRA 90-93, and is a super-hard wear-resistant material widely used at present. However, the conventional cemented carbide made of a powder metallurgy material cannot be melted and diffused with a matrix material due to inherent defects such as low internal pore structure and structural strength, poor toughness, and the like, and is difficult to form a strong bond with a matrix material.

The prior method for compounding the hard alloy material and the matrix iron-based material comprises the following steps:

1. the mechanical combination type composite fixes the hard alloy block on the working position of the steel matrix by screws, so as to achieve the purpose of improving the wear resistance. Such as a turning tool for a machine tool. The bonding firmness is poor, the hard alloy is easy to fall off, and the service life of the part is influenced.

2. Copper brazing adhesive compounding generally adopts mechanical combination modes such as solid brazing, inlaying and the like. The composite mode is only the adhesion between two materials, and diffusion fusion does not occur, so that the combination is unreliable, the phenomena of falling and breaking frequently occur in work, the equipment is easy to damage, the maintenance cost is high, and the material waste is easily caused.

In summary, the composite casting product containing the titanium carbide-based powder metallurgy product is created aiming at the problems in the prior art, so that the dispersive metallurgical fusion formed between the hard reinforcing phase and the base material can be met, the falling and cracking of the hard reinforcing phase are avoided, the bonding firmness is improved, and different performance requirements of different parts of the part are met.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a composite casting product containing a titanium carbide-based powder metallurgy product, which can meet the requirement of forming dispersive metallurgical fusion between a hard reinforcing phase and a matrix material, avoid the falling and separation of the hard reinforcing phase, improve the bonding firmness, and meet the different performance requirements of different parts of a part, thereby overcoming the defect that the existing hard alloy material and a parent material are difficult to compound.

In order to solve the technical problem, the invention provides a composite casting product containing a titanium carbide-based powder metallurgy product, which comprises the following components in percentage by mass: 48-55% of TiC, 8.5-9% of Mn, 2% of Mo, 1.5-1.7% of Ni, 12-13% of C and the balance of Fe, wherein the titanium carbide-based powder metallurgy product and the matrix material are molded by one-step casting through a casting process, and a dispersive metallurgical fusion is formed between the titanium carbide-based powder metallurgy product and the matrix material.

The further improvement is that the density of the titanium carbide-based powder metallurgy product is 6.4-6.6, and the hardness is HRA 86-90.

In a further improvement, the titanium carbide-based powder metallurgy product is formed by sintering the following components in percentage by mass: 55% of TiC, 9% of Mn, 2% of Mo, 1.7% of Ni, 12% of C and 20.3% of Fe, wherein the density of the titanium carbide-based powder metallurgy product is 6.4-6.5, and the hardness is HRA 88-90.

In a further improvement, the titanium carbide-based powder metallurgy product is formed by sintering the following components in percentage by mass: 48% of TiC, 8.5% of Mn, 2% of Mo, 1.5% of Ni, 13% of C and 27% of Fe, wherein the density of the titanium carbide-based powder metallurgy product is 6.5-6.6, and the hardness is HRA 86-88.

Further improved, the base material is cast steel or alloy cast steel liquid material.

In a further improvement, the preparation method of the composite casting product comprises the following steps:

(1) placing the titanium carbide-based powder metallurgy product at a designated position of a die;

(2) pouring the well-smelted base material into a die in which the titanium carbide-based powder metallurgy product is positioned in a negative pressure environment, wherein the pouring temperature is 1500-1600 ℃;

(3) after the pouring is finished and the solidification is finished, quenching and tempering are carried out, and then the titanium carbide-based powder metallurgy product and the matrix material are generated to form a dispersed metallurgical fusion-fused composite fusion-cast product.

Further improvement, after the pouring in the step (3) is finished, firstly stopping negative pressure for 1-2 minutes, and keeping the temperature to be not lower than 1500 ℃ within 2 minutes; and rapidly starting negative pressure for 15-20 minutes to achieve rapid cooling.

In a further improvement, the product is a railway or mining machinery equipment accessory.

After adopting such design, the invention has at least the following advantages:

according to the composite casting product, the proportion relation of TiC, Mn, Mo, Ni, C and Fe in the titanium carbide-based powder metallurgy product is changed and searched, so that a coating structure carbide (Fe (Ti-Mn) C) is formed at the periphery of the metallurgy product, the wettability of a hard metallurgy product and a base material is increased, the dispersive metallurgy fusion between the metallurgy product and the base material is realized through a fusion casting process, the hardness requirement of the hard metallurgy product can be met, the shedding and cracking of the metallurgy product from the base material can be avoided, the technical problem that the existing titanium carbide-based powder metallurgy product cannot be fused with the base material through the casting process is thoroughly solved, the firmness is increased, the requirements on the wear resistance and the firmness of equipment are met, and the service life of the equipment is prolonged.

Detailed Description

The invention aims to solve the technical problem that the existing titanium carbide-based powder metallurgy product cannot be fused with a base material through a casting process, and the titanium carbide-based powder metallurgy product can form a coating structure carbide (Fe (Ti-Mn) C) by changing and searching the proportion relation of components of TiC, Mn, Mo, Ni, C and Fe in the titanium carbide-based powder metallurgy product, so that the hardness requirement can be met, the wettability of TiC and the base material can be increased, the dispersive metallurgy fusion between the metallurgy product and the base material can be realized, the metallurgical product is prevented from falling off and cracking from the base material, the firmness is increased, and the requirements of the wear resistance and the firmness of equipment are met. Specific examples are as follows.

Example one

The cutting pick of the coal mine tunneling equipment is produced by using a composite fusion casting process.

The titanium carbide-based powder metallurgy product (TM50) in the embodiment comprises the following components in percentage by mass: 48% TiC, 8.5% Mn, 2% Mo, 1.5% Ni, 13% C, 27% Fe. The titanium carbide-based powder metallurgy product (TM50) hard alloy material is produced by sintering the components in proportion. The density of the produced titanium carbide-based powder metallurgy product (TM50) is 6.5-6.6, and the hardness is HRA 86-88. The matrix material adopts high manganese steel liquid.

The method comprises the following steps:

the titanium carbide based powder metallurgy product (TM50) was placed at the tip of the working portion in a cutting pick die. And pouring high manganese steel matrix molten steel into a cutting tooth mould under a negative pressure environment, wherein the pouring temperature is 1600 ℃. Wherein, the negative pressure environment is obtained by vacuumizing the closed box body, the titanium carbide-based powder metallurgy product is arranged at the appointed position in the mould, and the mould is arranged in the closed box body.

After the casting is finished, the negative pressure is stopped for 1-2 minutes, the temperature in the box body can be kept to be not lower than 1500 ℃ within 2 minutes, then the negative pressure is started for 15-20 minutes quickly, the heat in the box body is removed, the box body is solidified quickly, and the completion of the casting reaction is facilitated. After solidification, quenching at 850 ℃ and 950 ℃ and tempering to generate the composite cutting pick product containing the titanium carbide-based powder metallurgy product.

The composite cutting pick product containing the titanium carbide-based powder metallurgy product generated by the embodiment is subjected to water toughening treatment, and the hardness of the cutting pick head is HRA 86-88. The cutting pick head encounters strong impact in the working process, and the hard alloy part has no conditions of particle shedding and fragmentation, which shows that the titanium carbide-based powder metallurgy product has high bonding firmness with a base material.

Example two

And (3) producing the drill bit of the rotary drilling rig by using a composite fusion casting process.

The titanium carbide-based powder metallurgy product (TM45) in the embodiment comprises the following components in percentage by mass: 55% of TiC, 9% of Mn, 2% of Mo, 1.7% of Ni, 12% of C and 20.3% of Fe. The titanium carbide-based powder metallurgy product (TM45) hard alloy material is produced by sintering the components in proportion. The density of the produced titanium carbide-based powder metallurgy product (TM45) is 6.4-6.5, and the hardness is HRA 88-90. The matrix material also adopts high manganese steel liquid.

According to the process steps of the first embodiment, the titanium carbide-based powder metallurgy product (TM45) was placed in the hammer bit mold at the working portion location. And pouring the matrix molten steel into the hammer drill bit mold under a negative pressure environment, wherein the pouring temperature is 1500 ℃. The negative pressure environment and the rapid solidification step were the same as in the first example. After solidification, quenching and tempering are carried out, thus producing the composite drill bit product containing the titanium carbide-based powder metallurgy product.

The composite drill bit product containing the titanium carbide-based powder metallurgy product generated by the embodiment is subjected to water toughening treatment, and the hardness of the working part of the drill bit is HRA 88-90. The drill bit product has no fragmentation phenomenon in the long-term working process, which shows that the titanium carbide-based powder metallurgy product and the matrix material have high bonding firmness.

Comparative example 1

By using the preparation process steps of the first embodiment, the composite casting cutting pick containing the titanium carbide-based powder metallurgy product is prepared.

The titanium carbide-based powder metallurgy product (TM30) in this comparative example comprises the following components in mass percent: 70% of TiC, 5% of Mn, 0.7% of Mo, 1.4% of Ni, 13% of C and 9.9% of Fe, and sintering the components in proportion to obtain the titanium carbide-based powder metallurgy product (TM30) hard alloy material. The density of the generated titanium carbide-based powder metallurgy product is 5.4-5.6, and the hardness is HRA 90-92. The matrix material also adopts high manganese steel liquid.

The titanium carbide based powder metallurgy product (TM30) was placed at the tip of the working portion in a cutting pick die according to the above process steps. And pouring matrix molten steel into the cutting tooth mould under a negative pressure environment, wherein the pouring temperature is 1600 ℃.

As a result, the titanium carbide-based powder metallurgy product (TM30) is cracked after meeting molten steel, which indicates that the toughness is low; and the titanium carbide-based powder metallurgy product (TM30) and a matrix material are not fused, so that the titanium carbide-based powder metallurgy product and the matrix material cannot be combined, and the technical effect of compounding cannot be achieved.

Comparative example No. two

Composite casting picks comprising titanium carbide-based powder metallurgy products were also prepared.

The titanium carbide-based powder metallurgy product (TM38) in this comparative example comprises the following components in mass percent: 62 percent of TiC, 7 percent of Mn, 0.6 percent of Mo, 1.4 percent of Ni, 12 percent of C and 17 percent of Fe, and the titanium carbide-based powder metallurgy product (TM38) hard alloy material is produced by sintering the components in proportion. The density of the generated titanium carbide-based powder metallurgy product is 5.5-5.7, and the hardness is HRA 88-90. The matrix material also adopts high manganese steel liquid.

The titanium carbide based powder metallurgy product (TM38) was placed at the tip of the working portion in a cutting pick die according to the above process steps. And pouring the base molten steel into the cutting tooth mould under the negative pressure environment, wherein the pouring temperature is 1500 ℃.

As a result, the titanium carbide-based powder metallurgy product (TM38) has the advantages that although the proportion of iron and manganese elements is increased, partial coating structure carbide (Fe (Ti-Mn) C) can be formed, the wettability and the toughness are improved, the as-cast cracking rate can be reduced to about 20%, and the cracking rate after heat treatment is still over 30%, which indicates that the wettability of the metallurgy product is still poor under the proportioning condition, and the problem that the fusion of the metallurgy product and a base material is difficult still exists.

Comparative example No. three

Composite casting picks comprising titanium carbide-based powder metallurgy products were also prepared.

The titanium carbide-based powder metallurgy product (TM60) in this comparative example comprises the following components in mass percent: 38 percent of TiC, 8 percent of Mn, 0.7 percent of Mo, 1.4 percent of Ni, 13 percent of C and 38.9 percent of Fe, and the titanium carbide-based powder metallurgy product (TM60) hard alloy material is prepared by sintering the components in proportion. The density of the generated titanium carbide-based powder metallurgy product is 6.5-6.6, and the hardness is HRA 82-85. The base material is as above.

The titanium carbide based powder metallurgy product (TM60) was placed at the tip of the working portion in a cutting pick die according to the above process steps. And pouring the base molten steel into the cutting pick mold under a negative pressure environment, wherein the pouring temperature is 1550 ℃.

As a result, the titanium carbide-based powder metallurgy product (TM60) can form a coating structure carbide (Fe (Ti-Mn) C) by further reducing the proportion of TiC and increasing the proportion of elements such as iron, manganese and molybdenum, the impact toughness and the wettability are obviously improved, and the cemented carbide metallurgy product (TM60) and a base material can form a metallurgical fusion layer, but the hardness of the cemented carbide metallurgy product (TM60) is low, the wear resistance is poor, and the hardness and wear resistance requirements of a composite casting product cannot be met.

From the composite casting product generated in the embodiment and the comparative example, only under the condition of the titanium carbide-based powder metallurgy product with a specific proportion, the titanium carbide-based powder metallurgy product can be subjected to one-step fusion casting and mixing with high-temperature molten steel, and the technical effect of forming dispersive metallurgical fusion between the titanium carbide-based powder metallurgy product and a base material is achieved, so that the titanium carbide-based powder metallurgy product is firmly combined in the base material and is firmly compounded, the hardness requirement of the composite fusion casting product is met, the hard alloy is prevented from falling and cracking, the performance of the composite material is greatly improved, and the service life of the product is finally prolonged.

The composite casting product generated by the invention has the advantages that the ultra-strong hardness of the titanium carbide alloy product is used for obviously strengthening the matrix, the matrix material is used for supporting and protecting the titanium carbide alloy product, the titanium carbide alloy product and the matrix material are firmly compounded and supplemented, and the service life of the product is prolonged. In addition, the production cost has the advantages that the existing copper brazing production process is complex, the steps of cleaning the joint surface, heating and raising the temperature of the base material and the hard alloy material, melting brazing processing of copper elements, post-treatment and the like are required, the period is long, and the cost is high. The casting method adopting one-time pouring is simple in production process, the cost is reduced by 75% compared with that of a copper brazing process, and the economic benefit is considerable.

The composite casting product generated by the invention can also be any accessory needing high-hardness materials in coal mine tunneling equipment or railway mechanical equipment, and has wide application range.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.