A bimetallic powder composite steel material and its preparation method and application

Abstract

The invention relates to the technical field of metal composite materials, and discloses a bimetallic powder composite steel material, a preparation method thereof and an application thereof. The bimetallic powder composite steel material comprises a sharp layer and a wear-resistant layer sandwiched on both sides of the sharp layer, wherein the sharp layer is made of metal powder a, and the chemical element composition and mass fraction of the metal powder a are: carbon 1.80-2.0wt%, tungsten 0.50-0.80wt%, molybdenum 0.90-1.10wt%, chromium 19.40-20.50wt%, vanadium 3.80-4.00wt%, silicon 0.50-0.80wt%, manganese 0.20-0.45wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt%, and the balance iron and inevitable impurities. The wear-resistant layer is made of metal powder b, and the chemical element composition and mass fraction of the metal powder b are: carbon 1.80-2.0wt%, molybdenum 1.00-1.50wt%, chromium 5.00-5.50wt%, vanadium 9.00-10.00wt%, silicon 0.80-1.00wt%, manganese 0.20-0.6wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt% and the balance iron and inevitable impurities. The composite material of the invention has high strength and is not prone to cracking during the rolling process.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite materials, in particular to a bimetallic powder composite steel material and a preparation method and application thereof. Background Art

[0002] Industrial knives and kitchen knives for daily use are constantly pursuing cost-effectiveness and quality in today's rapidly developing manufacturing industry. At the same time, new requirements are constantly being put forward for knife materials. They need to be sharp and wear-resistant, have good toughness, and have excellent corrosion resistance. In order to obtain the hardness and wear resistance of high-carbon steel and the toughness of low-carbon steel, the ancient and traditional process uses the clamping steel method to produce knives. As a traditional handicraft, it cannot be mass-produced, and the cost is high and the efficiency is low. It is only collected as an art piece. With the development of modern process technology, in the field of industrial woodworking knives, a process of composite rolling of two materials has been developed to achieve two materials with different performances. Rolling composite welding saves materials while making the tool both hard and tough. However, the composite rolling process is to heat two materials to a high temperature for rolling welding. Since the heating temperature needs to take both materials into consideration, the process is limited. Relatively few materials can be composite rolled and welded by this process, and the different types of materials that can be composite rolled are limited. In addition, materials are prone to cracking using traditional composite rolling processes, or due to the large difference in the melting points of the two materials, it is difficult to select the rolling heating temperature. At high temperatures, the grains at the weld of the rolled weld are coarse and the welding strength is insufficient, which makes it easy to crack. Low rolling composite temperatures can easily lead to the inability to roll and weld. Summary of the invention

[0003] In order to solve the above problems in the prior art, the present invention provides a bimetallic powder composite steel material and a preparation method and application thereof.

[0004] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0005] A bimetallic powder composite steel material comprises a sharp layer and wear-resistant layers sandwiched on both sides of the sharp layer.

[0006] Preferably, the sharp layer is made of metal powder a.

[0007] Preferably, the chemical element composition and mass fraction of the metal powder a are:

[0008] Carbon 1.80-2.0wt%, tungsten 0.50-0.80wt%, molybdenum 0.90-1.10wt%, chromium 19.40-20.50wt%, vanadium 3.80-4.00wt%, silicon 0.50-0.80wt%, manganese 0.20-0.45wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt%, and the remainder iron and inevitable impurities.

[0009] Preferably, the wear-resistant layer is made of metal powder b.

[0010] Preferably, the chemical element composition and mass fraction of the metal powder b are:

[0011] Carbon 1.80-2.0wt%, molybdenum 1.00-1.50wt%, chromium 5.00-5.50wt%, vanadium 9.00-10.00wt%, silicon 0.80-1.00wt%, manganese 0.20-0.6wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt% and the balance iron and inevitable impurities.

[0012] The preparation method of bimetallic powder composite steel comprises the following steps:

[0013] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0014] 2) heating the steel ingot so that both different materials are in a good plastic deformation range;

[0015] 3) The steel ingot is rolled through a rolling mill to the required size.

[0016] Preferably, in step 2), the heating temperature of the steel ingot is 1160-1180°C.

[0017] The invention discloses an application of a bimetallic powder composite steel in the field of cutting tools.

[0018] The present invention has the following beneficial effects:

[0019] 1) The composite material has high strength and is not prone to cracking during the rolling process;

[0020] 2) Realize composite rolling production of different materials, improve efficiency and reduce the proportion of expensive materials used, and reduce material costs while maintaining equivalent product performance.

[0021] Specific implementation methods The technical scheme of the present invention is further described below through specific embodiments. Unless otherwise specified in the present invention, the raw materials and equipment used can be purchased from the market or are commonly used in the field. The methods in the embodiments are conventional methods in the field unless otherwise specified.

[0022] Example 1

[0023] A bimetallic powder composite steel material comprises a sharp layer and a wear-resistant layer sandwiched on both sides of the sharp layer. The sharp layer is made of metal powder a, and the wear-resistant layer is made of metal powder b.

[0024] The chemical element composition and mass fraction of the metal powder a are:

[0025] Carbon 2.0wt%, tungsten 0.80wt%, molybdenum 1.10wt%, chromium 20.50wt%, vanadium 4.00wt%, silicon 0.80wt%, manganese 0.45wt%, phosphorus 0.022wt%, sulfur 0.01wt%, and the balance iron and inevitable impurities.

[0026] The chemical element composition and mass fraction of the metal powder b are:

[0027] Carbon 2.0wt%, molybdenum 1.50wt%, chromium 5.50wt%, vanadium 10.00wt%, silicon 1.00wt%, manganese 0.6wt%, phosphorus 0.022wt%, sulfur 0.01wt% and the balance iron and inevitable impurities.

[0028] A method for preparing a bimetallic powder composite steel material comprises the following steps:

[0029] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0030] 2) The steel ingot is heated to 1170°C so that both different materials are in a good plastic deformation range;

[0031] 3) The steel ingot is rolled through a rolling mill to the required size.

[0032] After testing, it was found that the bimetallic powder composite steel material prepared by the above method had no cracks on the surface.

[0033] Example 2

[0034] A bimetallic powder composite steel material comprises a sharp layer and wear-resistant layers sandwiched on both sides of the sharp layer.

[0035] The sharp layer is made of metal powder a, and the wear-resistant layer is made of metal powder b.

[0036] The chemical element composition and mass fraction of the metal powder a are:

[0037] Carbon 1.80wt%, tungsten 0.50wt%, molybdenum 0.90wt%, chromium 19.40wt%, vanadium 3.80%, silicon 0.50wt%, manganese 0.20wt%, phosphorus 0.022wt%, sulfur 0.01wt%, and the balance iron and inevitable impurities. The chemical element composition and mass fraction of the metal powder b are:

[0038] Carbon 1.80wt%, molybdenum 1.00wt%, chromium 5.00wt%, vanadium 9.00wt%, silicon 0.80wt%, manganese 0.20wt%, phosphorus 0.022wt%, sulfur 0.01wt% and the balance iron and inevitable impurities.

[0039] A method for preparing a bimetallic powder composite steel material comprises the following steps:

[0040] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0041] 2) The steel ingot is heated to 1180°C so that both different materials are in a good plastic deformation range;

[0042] 3) The steel ingot is rolled through a rolling mill to the required size.

[0043] After testing, it was found that the bimetallic powder composite steel material prepared by the above method had no cracks on the surface.

[0044] Example 3

[0045] A bimetallic powder composite steel material comprises a sharp layer and a wear-resistant layer sandwiched on both sides of the sharp layer. The sharp layer is made of metal powder a, and the wear-resistant layer is made of metal powder b.

[0046] The chemical element composition and mass fraction of the metal powder a are:

[0047] Carbon 1.90wt%, tungsten 0.70wt%, molybdenum 1.00wt%, chromium 20.00wt%, vanadium 3.90wt%, silicon 0.70wt%, manganese 0.40wt%, phosphorus 0.020wt%, sulfur 0.01wt%, and the balance iron and inevitable impurities.

[0048] The chemical element composition and mass fraction of the metal powder b are:

[0049] Carbon 1.90wt%, molybdenum 1.30wt%, chromium 5.20wt%, vanadium 9.50wt%, silicon 0.80-1.00wt%, manganese 0.50wt%, phosphorus 0.022wt%, sulfur 0.01wt% and the balance iron and inevitable impurities.

[0050] A method for preparing a bimetallic powder composite steel material comprises the following steps:

[0051] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0052] 2) The steel ingot is heated to 1170°C so that both different materials are in a good plastic deformation range;

[0053] 3) The steel ingot is rolled through a rolling mill to the required size.

[0054] After testing, it was found that the bimetallic powder composite steel material prepared by the above method had no cracks on the surface.

[0055] Example 4

[0056] A bimetallic powder composite steel material comprises a sharp layer and a wear-resistant layer sandwiched on both sides of the sharp layer. The sharp layer is made of metal powder a, and the wear-resistant layer is made of metal powder b.

[0057] The chemical element composition and mass fraction of the metal powder a are:

[0058] Carbon 1.90wt%, tungsten 0.60wt%, molybdenum 0.95wt%, chromium 19.50wt%, vanadium 3.90wt%, silicon 0.70wt%, manganese 0.40wt%, phosphorus 0.022wt%, sulfur 0.01wt%, and the balance iron and inevitable impurities.

[0059] The chemical element composition and mass fraction of the metal powder b are:

[0060] Carbon 1.95wt%, molybdenum 1.30wt%, chromium 5.20wt%, vanadium 9.70wt%, silicon 0.850wt%, manganese 0.5wt%, phosphorus 0.022wt%, sulfur 0.01wt% and the balance iron and inevitable impurities.

[0061] A method for preparing a bimetallic powder composite steel material comprises the following steps:

[0062] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0063] 2) The steel ingot is heated to 1160°C so that both materials are in a good plastic deformation range;

[0064] 3) The steel ingot is rolled through a rolling mill to the required size.

[0065] After testing, it was found that the bimetallic powder composite steel material prepared by the above method had no cracks on the surface.

[0066] Example 5

[0067] A bimetallic powder composite steel material comprises a sharp layer and a wear-resistant layer sandwiched on both sides of the sharp layer. The sharp layer is made of metal powder a, and the wear-resistant layer is made of metal powder b.

[0068] The chemical element composition and mass fraction of the metal powder a are:

[0069] Carbon 1.80wt%, tungsten 0.80wt%, molybdenum 0.90wt%, chromium 20.50wt%, vanadium 4.00wt%, silicon 0.50wt%, manganese 0.45wt%, phosphorus 0.022wt%, sulfur 0.01wt%, and the balance iron and inevitable impurities.

[0070] The chemical element composition and mass fraction of the metal powder b are:

[0071] Carbon 1.80wt%, molybdenum 1.50wt%, chromium 5.00wt%, vanadium 10.00wt%, silicon 1.00wt%, manganese 0.20wt%, phosphorus 0.022wt%, sulfur 0.01wt% and the balance iron and inevitable impurities.

[0072] A method for preparing a bimetallic powder composite steel material comprises the following steps:

[0073] 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing;

[0074] 2) The steel ingot is heated to 1180°C so that both different materials are in a good plastic deformation range;

[0075] 3) The steel ingot is rolled through a rolling mill to the required size.

[0076] After testing, it was found that the bimetallic powder composite steel material prepared by the above method had no cracks on the surface.

[0077] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection claimed by the present invention.

Claims

1. A bimetallic powder composite steel, It is characterized in that It comprises a sharp layer and wear-resistant layers sandwiched on both sides of the sharp layer; The sharp layer is made of metal powder a; The chemical element composition and mass fraction of the metal powder a are: Carbon 1.80-2.0wt%, tungsten 0.50-0.80wt%, molybdenum 0.90-1.10wt%, chromium 19.40-20.50wt%, vanadium 3.80-4.00wt%, silicon 0.50-0.80wt%, manganese 0.20-0.45wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt%, and the balance iron and unavoidable impurities; The wear-resistant layer is made of metal powder b; The chemical element composition and mass fraction of the metal powder b are: Carbon 1.80-2.0wt%, molybdenum 1.00-1.50wt%, chromium 5.00-5.50wt%, vanadium 9.00-10.00wt%, silicon 0.80-1.00wt%, manganese 0.20-0.6wt%, phosphorus ≤0.022wt%, sulfur ≤0.01wt% and the balance iron and inevitable impurities.

2. A method for preparing the bimetallic powder composite steel as claimed in claim 1, It is characterized in that The following steps are involved: 1) Compounding metal powder a and metal powder b into a steel ingot by hot isostatic pressing; 2) heating the steel ingot so that both different materials are in a good plastic deformation range; 3) The steel ingot is rolled through a rolling mill to the required size.

3. A method for preparing a bimetallic powder composite steel according to claim 2, It is characterized in that In the step 2), the heating temperature of the steel ingot is 1160-1180°C.

4. Application of the bimetallic powder composite steel as claimed in claim 1 in the field of cutting tools.