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Functional gradient cast iron material and preparation method thereof

A functionally graded, cast iron technology, applied in the field of metal materials, can solve problems such as toughness, thermal conductivity, fatigue resistance, and oxidation resistance.

Active Publication Date: 2015-01-07
XIAN KANGBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of existing homogeneous materials for cylinder heads that are difficult to balance strength and toughness, thermal conductivity, fatigue resistance and oxidation resistance, establish the connection between the graphite shape of the cylinder head material and the structure of the cylinder head, and provide a functional gradient Cast iron material and its preparation method

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  • Functional gradient cast iron material and preparation method thereof
  • Functional gradient cast iron material and preparation method thereof
  • Functional gradient cast iron material and preparation method thereof

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Effect test

Embodiment 1

[0035] A functionally graded cast iron material, which is composed of materials perpendicular to the fire surface of the cast iron cylinder head along the height direction: 5mm thick nodular cast iron, 2mm thick gray cast iron, and vermicular graphite cast iron for other parts of the cylinder head (see Figure 4 ).

[0036] The basic chemical composition of three kinds of cast iron is: its chemical composition is respectively by weight percentage:

[0037] C: 3.6%, Si: 2.1%, Mn: 0.2%, Cu: 0.3%, Mo: 0.2%, Cr: 0.1%, Sn: 0.02%, the rest is composed of iron and unavoidable impurities, and its carbon equivalent is 4.3 ; The inoculant and the modificator are 75 silicon-iron and magnesium-rare earth creeping agents respectively, and the particle size of the 75 silicon-iron and magnesium-rare earth creeping agents are both 2mm.

[0038] The preparation method of the functionally graded cast iron material is: comprising the following preparation steps:

[0039] a. Alloy melting: Use ...

Embodiment 2

[0044] A functionally graded cast iron material, which is composed of materials perpendicular to the fire surface of the cast iron cylinder head along the height direction: 5mm thick nodular cast iron, 8mm thick gray cast iron, and vermicular graphite cast iron for other parts of the cylinder head (see Figure 4 ).

[0045] The basic chemical composition of the three cast irons is: C: 3.7%, Si: 2.2%, Mn: 0.3%, Cu: 0.4%, Mo: 0.2%, Cr: 0.1%, Sn: 0.04%, the rest is iron and unavoidable The impurity composition is 4.4 carbon equivalent; the inoculant and the modificator are commercially available 75 silicon-iron and magnesium-rare earth creeping agents, respectively, with a particle size of 4mm.

[0046] The preparation method of the functionally graded cast iron material is as follows:

[0047] a. Alloy melting: Use a medium frequency induction furnace to melt the required cast iron alloy, pour it into the insulation bag after it is out of the furnace, and control it at 1480°C.

...

Embodiment 3

[0052] The functional gradient cast iron material prepared by the present invention is composed of materials perpendicular to the fire surface of the cast iron cylinder head along the height direction: 9mm thick nodular cast iron, 10mm thick gray cast iron, and other parts of the cylinder head are vermicular graphite cast iron (see Figure 5 );

[0053] The basic chemical composition of the three cast irons is: C: 3.7%, Si: 2.2%, Mn: 0.3%, Cu: 0.4%, Mo: 0.2%, Cr: 0.1%, Sn: 0.04%, the rest is iron and unavoidable The impurity composition is 4.4 carbon equivalent; the inoculant and the modificator are commercially available 75 silicon-iron and magnesium-rare earth creeping agents, respectively, with a particle size of 4mm.

[0054] The preparation method of the functionally graded cast iron material is as follows:

[0055] a. Alloy melting: Use a medium frequency induction furnace to melt the required cast iron alloy, pour it into the insulation bag after it is released, and co...

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Abstract

The invention provides a functional gradient cast iron material and a preparation method thereof. The high toughness, the anti-fatigue property, the heat conduction property and the anti-oxidation property of a conventional cast iron material conflict with one another, and the phenomenon that one property is highlighted and another one is inhibited is serious. The functional gradient cast iron material consists of spheroidal graphite cast iron, gray pig iron and vermicular graphite cast iron in sequence being perpendicular to a fire face of a diesel engine cylinder cover in the height direction, the carbon equivalent of the three types of cast iron is all 4.3-4.6; other components are identical, an identical nucleating agent and an alterant are adopted, the variety and the content of the solidified cast iron are controlled by regulating and controlling the adding speed of the nucleating agent and the alterant and the velocity of metal melt, and thus the required functional gradient cast iron material is prepared. By adopting the functional gradient cast iron material, the difficulty of thermal stress cracking of a high-power diesel engine cylinder cover is thoroughly solved, and the requirements of a novel high-power diesel engine are met.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a functional gradient cast iron material and a preparation method thereof. Background technique [0002] With the development of variable turbocharging technology and high-pressure common rail direct injection technology, users have put forward higher and higher requirements for diesel engine power per liter, compact structure, complex shape of castings and heat load. And the manufacturing technology also puts forward higher requirements, which are mainly manifested in: the thermal load and mechanical load of different parts of the high-power diesel engine cast iron cylinder head are very different (see figure 1 ), so the requirements for material properties are also different, which are embodied in the following aspects: [0003] (1) The fire surface constituting the combustion chamber requires high toughness, high oxidation resistance and fatigue resistance; (2) The interior of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C22C33/10
Inventor 杨忠李建平郭永春梁民宪杨通高培虎陶栋
Owner XIAN KANGBO NEW MATERIAL TECH
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