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Functionally graded 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: 2016-06-08
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

Method used

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  • Functionally graded cast iron material and preparation method thereof
  • Functionally graded cast iron material and preparation method thereof
  • Functionally graded cast iron material and preparation method thereof

Examples

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Comparison scheme
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 comprises the following preparation steps:

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

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. The strength, toughness, fatigue resistance, thermal conductivity, and oxidation resistance of traditional cast iron materials are contradictory, and the phenomenon of one trade-off is very serious. The functionally graded cast iron material is composed of nodular cast iron, gray cast iron and vermicular graphite cast iron in the height direction perpendicular to the fire surface of the cylinder head of the diesel engine. The carbon equivalent of the three cast irons is 4.3-4.6, and the other components are the same. The modificator is used to control the type and content of the solidified cast iron by adjusting the adding speed of the inoculant and the modificator and the flow rate of the metal melt, so as to prepare the required functionally graded cast iron material. The invention can completely solve the problem of thermal stress cracking of the cylinder head of the high-power diesel engine and meet the requirements of the new high-power diesel engine.

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 th...

Claims

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Application Information

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Patent Type & Authority Patents(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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