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Ultra-high-strength multiphase-structure gray cast iron cylinder jacket and preparation method thereof

A cylinder liner and gray cast iron technology, which is applied in the field of automobile engine cylinder liner preparation, can solve the problems of low tensile strength of gray iron and difficulty in improving the comprehensive mechanical properties of the cylinder liner, and reduce production costs, and the preparation method is simple and easy to implement Effect

Active Publication Date: 2015-09-16
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile strength of gray iron is low, the plasticity is almost zero, and the comprehensive mechanical properties of the cylinder liner are difficult to improve

Method used

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  • Ultra-high-strength multiphase-structure gray cast iron cylinder jacket and preparation method thereof
  • Ultra-high-strength multiphase-structure gray cast iron cylinder jacket and preparation method thereof
  • Ultra-high-strength multiphase-structure gray cast iron cylinder jacket and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The gray cast iron cylinder liner with multiphase structure provided in this embodiment is made of gray cast iron, and its microstructure includes two phases of bainite and martensite; in terms of mass percentage, the material composition of the cylinder liner is for:

[0036] Carbon, 2.7%; Silicon, 1.85%;

[0037] Niobium, 0.4%; Copper, 0.25%;

[0038] Manganese, 0.2%; Cobalt, 0.2%;

[0039] Nitrogen, 0.15%;

[0040] Phosphorus, 0.05%; sulfur, 0.05%, the balance is iron.

[0041] The preparation method of the gray cast iron cylinder liner with multiphase structure comprises the following steps:

[0042] (1) ingredients in proportion,

[0043] (2) Melting and pouring the cylinder liner blanks, the mixed materials in step (1) are melted at 1450°C~1550°C, released at 1500°C~1550°C, centrifugally poured at 1150~1250r / min, and the pouring temperature is 1350°C~ 1450°C; the mold temperature is 350~500°C, the mold release temperature is not lower than 740°C, and the mol...

Embodiment 2

[0052] The gray cast iron cylinder liner with multiphase structure provided in this embodiment is made of gray cast iron, and its microstructure includes two phases of bainite and martensite; in terms of mass percentage, the material composition of the cylinder liner is for:

[0053] Carbon, 2.7%; Silicon, 1.85%;

[0054] Niobium, 0.8%; Copper, 0.25%;

[0055] Manganese, 0.2%; Cobalt, 0.2%;

[0056] Nitrogen, 0.15%;

[0057] Phosphorus, 0.05%; sulfur, 0.05%, the balance is iron.

[0058] The preparation method is the same as in Example 1.

[0059] The mechanical properties of the multi-phase gray cast iron cylinder liner provided in this example are tested according to relevant national standards and industry standards, and the results are: hardness = 356HB, Rm = 648MPa, E = 164GPa, and the corresponding microstructure is as follows figure 2 shown.

Embodiment 3

[0061] The gray cast iron cylinder liner with multiphase structure provided in this embodiment is made of gray cast iron, and its microstructure includes two phases of bainite and martensite; in terms of mass percentage, the material composition of the cylinder liner is for:

[0062] Carbon, 2.7%; Silicon, 1.85%;

[0063] Niobium, 0.4%; Copper, 0.25%;

[0064] Manganese, 0.2%; Cobalt, 0.2%;

[0065] Nitrogen, 0.15%;

[0066] Phosphorus, 0.05%; sulfur, 0.05%, the balance is iron.

[0067] (The recipe is the same as in Example 1, please check to see if it is correct)

[0068] The preparation method is the same as in Example 1, only the low temperature tempering temperature in step (5) is adjusted to 220°C.

[0069] The mechanical properties of the multi-phase gray cast iron cylinder liner provided in this example are tested according to relevant national standards and industry standards, and the results are: hardness = 335HB, Rm = 614MPa, E = 159GPa, and the corresponding m...

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Abstract

The invention belongs to the technical field of automobile engine cylinder jacket preparation and specifically relates to an ultra-high-strength multiphase-structure (bainite & martensite) cylinder jacket and a preparation method thereof. The material of the cylinder jacket is gray cast iron, and the microstructure of the cylinder jacket comprises two structure phases of bainite and martensite; in percentage by mass, the cylinder jacket is prepared from such components as 2.6-2.8% of carbon, 1.8-2.2% of silicon, 0.4-0.8% of niobium, 0.2-0.4% of copper, 0.1-0.3% of manganese, 0.1-0.3% of cobalt, 0.08-0.3% of nitrogen, less than or equal to 0.08% of phosphorus, less than or equal to 0.08% of sulfur, and the balance of iron. The ultra-high-strength multiphase-structure gray cast iron cylinder jacket is mainly characterized in that the adopted cylinder jacket material is added with an appropriate amount of such elements as niobium, cobalt, copper and nitrogen on the basis of common gray cast iron, and noble metal elements such as nickel and molybdenum are completely avoided. The preparation method is simple and convenient, and easy to implement, and has the characteristics of high strength and high elastic modulus.

Description

technical field [0001] The invention belongs to the technical field of preparation of automobile engine cylinder liners, and in particular relates to an ultra-high-strength multi-phase structure (bainite+martensite) cylinder liner and a preparation method thereof. Background technique [0002] Cylinder liner is one of the core parts and wearing parts of the engine, and its quality has a great influence on the power, fuel consumption and emissions of the engine. With the improvement of automobile performance requirements, engine designers have increasingly strict requirements on the hardness, machining accuracy, and surface quality of cylinder liners. Low cost, easy processing and other factors, so the cylinder liner material is mostly gray cast iron. However, the tensile strength of gray iron is low, and the plasticity is almost zero, so it is difficult to improve the comprehensive mechanical properties of the cylinder liner. In order to obtain high-performance materials f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21D1/20C21D5/00
Inventor 熊毅高广东秦小才
Owner ZYNP GRP
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