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Bimetallic bainite-martensite complex phase steel wear-resistant liner and preparation method thereof

A wear-resistant liner and bainite technology, which is applied in the field of metal material casting, can solve the problems that the hardness of the wear layer is difficult to control, the toughness of the matrix layer is difficult to control, the liner is not easy to control, and the composition of the liner is single, so as to achieve excellent comprehensive mechanical properties, good The effect of comprehensive mechanical properties and simple heat treatment process

Active Publication Date: 2016-08-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional liners are mostly produced by casting, and the entire liner has a single composition, so it is difficult to take into account both hardness and toughness. Therefore, the existing liner mostly adopts a composite structure to achieve high hardness in the inner layer and high toughness in the outer layer. comprehensive mechanical properties
[0003] Chinese invention patent CN102921927A proposes a method for preparing a double-liquid double-alloy wear-resistant liner, but the wear-resistant layer is made of cast iron, and the base layer is made of alloy steel. Due to the large difference in C content between the two, there will be produced at the casting interface Large stress, easy to crack at the bonding interface during use, and in the subsequent heat treatment process, due to the austenitization temperature and cooling rate of the cast iron and the matrix are different, the structure is difficult to control, resulting in poor performance , the hardness of the wear layer and the toughness of the matrix layer are difficult to control
The Chinese invention patent CN1962122A also discloses a method for preparing a double-liquid double-alloy wear-resistant lining plate. The wear-resistant layer and the base layer are both made of bainite steel. Since the bainite steel needs to be austempered during the heat treatment process , the two kinds of bainitic steel alloy element content used are different, and the required austenitization temperature and cooling rate are also different. In the heat treatment process, because the whole casting is heat treated, so only the One austenitizing temperature and one cooling rate are not easy to control the phase transformation of the entire liner, and it is difficult to take into account the structure and performance of the wear-resistant layer and the matrix layer

Method used

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  • Bimetallic bainite-martensite complex phase steel wear-resistant liner and preparation method thereof
  • Bimetallic bainite-martensite complex phase steel wear-resistant liner and preparation method thereof
  • Bimetallic bainite-martensite complex phase steel wear-resistant liner and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] In this example, a bimetallic bainite-martensite composite phase wear-resistant lining plate with a thickness of 300mm was prepared, the wall thickness of the wear-resistant layer was 100mm, and the wall thickness of the matrix layer was 200mm; the chemical composition of the two-layer materials is shown in Table 1

[0023] Table 1

[0024]

[0025] The preparation method of the bimetallic bainite-martensite composite phase wear-resistant lining plate described in this embodiment specifically includes the following steps:

[0026] (1) Melting: According to the composition of the outer layer and the inner layer, the ingredients are mixed, and the intermediate frequency induction furnace is used for melting respectively.

[0027] (2) Layered casting: First, pour the inner molten steel through the inner sprue into the cavity with the chilled layer installed at the bottom, the casting temperature is 1480°C; when cooled to 1300°C, pour the outer layer of molten steel, Th...

Embodiment 2

[0032] In this example, a bimetallic bainite-martensite composite phase wear-resistant lining plate with a thickness of 300 mm was prepared, the wall thickness of the wear-resistant layer was 150 mm, and the wall thickness of the matrix layer was 150 mm; the chemical composition of the two layers of materials is shown in Table 2

[0033] Table 2

[0034]

[0035] The preparation method of the bimetallic bainite-martensite composite phase wear-resistant lining plate described in this embodiment specifically includes the following steps:

[0036] (1) Melting: According to the composition of the outer layer and the inner layer, the ingredients are mixed, and the intermediate frequency induction furnace is used for melting respectively.

[0037] (2) Layered casting: firstly pour the inner molten steel through the inner sprue into the cavity where the cooling layer is installed at the bottom, the casting temperature is 1500°C; when cooled to 1325°C, then pour the outer layer of ...

Embodiment 3

[0042] In this example, a bimetallic bainite-martensite composite wear-resistant lining plate with a thickness of 300 mm was prepared, the wall thickness of the wear-resistant layer was 125 mm, and the wall thickness of the matrix layer was 175 mm; the chemical composition of the two layers of materials is shown in Table 3

[0043] table 3

[0044]

[0045] The preparation method of the bimetallic bainite-martensite composite phase wear-resistant lining plate described in this embodiment specifically includes the following steps:

[0046] (1) Melting: According to the composition of the outer layer and the inner layer, the ingredients are mixed, and the intermediate frequency induction furnace is used for melting respectively.

[0047] (2) Layered casting molding: First, pour the inner molten steel through the inner sprue into the cavity with the chilling layer installed at the bottom, the casting temperature is 1520°C; when cooled to 1350°C, pour the outer layer of molten ...

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Abstract

The present invention discloses a bimetallic composite bainite-martensite complex phase steel wear-resistant liner and a preparation method thereof, and belongs to the technical field of metal material casting. The method is as below: two liquids and two metals cast low-carbon alloy bainite-martensite complex phase alloy steel with different components in silicon manganese system; an inner layer is a high-hardness bainite-martensite wear-resistant layer; an outer layer is a high-toughness impact resistant base layer; after heat treatment, the inner and outer layers acquire different tissues, so as to obtain different properties. The method optimizes the alloy composition ratio of the inner liner and outer material, uses reasonable double-liquid bimetal casting process, employs a conventional salt bath austempering heat treatment to endow the inner and outer layers with different tissues. The inner layer of the liner has hardness of 55-57 HRC, and impact toughness of 11-14J / cm<2>; the outer layer has hardness of 45-50 HRC and impact toughness of 19-21J / cm<2>, thereby obtaining the wear-resistant liner with superior hardness and toughness and low cost.

Description

technical field [0001] The invention relates to a bimetallic bainite-martensite composite wear-resistant liner and a preparation method thereof, belonging to the technical field of metal material casting. Background technique [0002] With the acceleration of the modern industrial process, the diameter of the ball mill semi-autogenous mill is increasing, and the performance of the liner as a consumable part is directly related to the production efficiency of the entire equipment. Due to the ore crushing operation under high stress, it is required that the liner should not only have high wear resistance, but also have high impact toughness to bear the wear of high-energy impact abrasives. Traditional liners are mostly produced by casting, and the entire liner has a single composition, so it is difficult to take into account both hardness and toughness. Therefore, the existing liner mostly adopts a composite structure to achieve high hardness in the inner layer and high toughn...

Claims

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Application Information

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IPC IPC(8): B32B15/01C22C38/02C22C38/04C22C38/18C22C38/08C22C38/12C22C38/60C21D1/26C21D1/20C21D1/46B22D19/16
CPCC21D1/20C21D1/26C21D1/46C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18C22C38/32C22C38/60B22D19/16B32B15/011C21D2211/008C21D2211/002B32B2307/536B32B2307/554B32B2307/558
Inventor 李祖来焦岩山泉蒋业华周荣
Owner KUNMING UNIV OF SCI & TECH
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