Self-lubricating wear-resistant eutectic graphitic steel and preparation method thereof

A wear-resistant and self-lubricating technology, applied in the field of ferrous metal materials, can solve the problems of large damage to mechanical properties, continuity of split matrix tissue, and low reliability, and achieve the effect of superior sound absorption and shock absorption

Active Publication Date: 2019-05-14
XIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reliability is still not high for the production of key parts of friction partners, such as rolling bearings and gears
Although the mechanical properties of the ausferrite structure are similar to those of steel, the graphite balls embedded in it are relatively large in size, generally as high as 50-120 μm in diameter, far exceeding the size of the second-phase hard particles in steel, which splits the continuity of the matrix structure. property, and the damage to its mechanical properties is greater

Method used

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  • Self-lubricating wear-resistant eutectic graphitic steel and preparation method thereof
  • Self-lubricating wear-resistant eutectic graphitic steel and preparation method thereof
  • Self-lubricating wear-resistant eutectic graphitic steel and preparation method thereof

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preparation example Construction

[0029] A method for preparing self-lubricating and wear-resistant eutectic graphite steel, comprising the steps of:

[0030] According to the mechanical properties (hardness, tensile strength, elongation, impact toughness, etc.) 10, QT550-6, QT600-5, etc.) and specifications, use empirical formulas to calculate the ratio of various materials (bread iron, scrap steel, recycled materials, various ferroalloys, etc.), and preset the molten iron after inoculation and ball After chemical treatment, its carbon equivalent will be in the range of eutectic composition (CE) or slightly lower than 0.05% of this composition; the preset composition material is melted into molten iron in an electric furnace, wherein each group in the preset composition material The mass percentage range is: C: 3.2%-3.6%, Si: 1.4-1.8%, Mn: 0.1-0.5%, P: ≤0.015%, S: ≤0.015%, Cr: ≤0.6%, Cu: ≤0.8 %, Ni≤1.0%, the total amount of other alloy elements: ≤1.0% and the balance is Fe, the sum of the mass percentages of...

Embodiment 1

[0057] Objective: To draw a ductile iron hollow profile with an outer diameter of 200mm and a wall thickness of 20mm, and prepare it into eutectic graphite steel with a hardness ≥ HRC45.

[0058] Casting materials (60% Q14 # Bread iron, 20% low-carbon steel scraps, 20% nodular iron return material) are melted into molten iron in an intermediate frequency induction furnace, and adjusted to the mass percentages of the following components: C: 3.30% ± 0.05%, Si: 1.6 ± 0.05 %, Mn ≤ 0.2%, P: ≤ 0.015%, S: ≤ 0.015%, Cu: 0.6%, Ni ≤ 0.6%, Cr: ≤ 0.3% and the balance Fe, the sum of the mass percentages of each component is 100%.

[0059] After the molten iron reaches 1530°C, set aside for 20 minutes, pour 300Kg into the hanging bag, put 4.5Kg of cerium rare earth magnesium nodulizer (accounting for 1.5% of the weight of the molten iron) in advance in the bottom pit of the hanging bag, and cover it with nodular iron filings; wait for nodularization After the reaction is completed, add 75...

Embodiment 2

[0076] Objective: To draw a ductile iron hollow profile with an outer diameter of 100mm and a wall thickness of 10mm, and prepare it into eutectic graphite steel with a hardness ≥ HRC32.

[0077] For brief description, for the parts not mentioned in this embodiment, reference may be made to Embodiment 1.

[0078] Casting materials (60% Q14 # Bread iron, 20% low-carbon steel scraps, 20% nodular iron return charge) are melted into molten iron in an intermediate frequency induction furnace, and adjusted to the mass percentages of the following components: C: 3.45% ± 0.05%, Si: 1.5 ± 0.05 %, Mn≤0.2%, P: ≤0.015%, S: ≤0.015%, Cu≤0.6%, Ni≤0.8%, Cr: ≤0.2% and the balance is Fe, the sum of the mass percentages of each component is 100% .

[0079] It should be noted that the final silicon content of the molten iron after inoculation and spheroidization treatment is 2.80%±0.05%, and the residual magnesium content is 0.035%-0.045%. After inoculation and spheroidization, the temperature...

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Abstract

The invention discloses self-lubricating wear-resistant eutectic graphitic steel and a preparation method thereof, and relates to the field of ferrous materials. The eutectic graphitic steel is different from ordinary isothermal quenching nodular cast iron in the preparation method, graphite shape and engineering service response behavior. Sectionoal materials are drawn through a continuous casting method with the rapid cooling ability, the composition of molten iron is strictly controlled at the eutectic point, and thus eutectic graphite nodules with the spheroidization rate of 100% are obtained; in addition, the fine graphite nodules are in dispersed distribution, the peripheries of the graphite nodules are coated with layers of amorphous mechanical impurities, impurity elements in the molten iron are collected, and the grain boundary of a matrix is purified; and tiny high-frequency elastic deformation of the materials in service can appear rings of 'strain aging and heat aging' softening structures around the graphite nodules, initiation of fatigue cracks is effectively inhibited, and the fatigue life is prolonged. In summary, the eutectic graphite steel has excellent mechanicalperformance of quenched steel and physical properties of self-lubrication, sound absorption and noise reduction, shock absorption and friction reduction of cast iron materials.

Description

technical field [0001] The invention relates to the field of ferrous metal materials, in particular to a self-lubricating and wear-resistant eutectic graphite steel and a preparation method thereof. Background technique [0002] Among the metal materials for making key friction parts, there is still a lack of materials that can take into account the four major properties of self-lubricating, sound-absorbing and shock-absorbing, wear-resistant and fatigue-resistant. The ductile iron material contains spherical graphite, and its working surface has self-lubricating properties, which can greatly reduce the friction coefficient, reduce frictional heat and wear rate. However, compared with medium-high carbon structural steel and alloy carburizing steel, the mechanical properties of ductile iron are poor, making it difficult to manufacture key parts such as bearings and gears. Carbon steel and ordinary alloy steel have increased hardness after quenching and tempering, good streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C37/04C22C33/10C21C1/10B22D11/128C21D1/32C21D1/20
Inventor 许旸蒋百灵刘保建颜国君
Owner XIAN UNIV OF TECH
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