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Detection method for degree of graphitization of cast iron

A technology of graphitization degree and detection method, applied in the direction of measuring device, specific gravity measurement, instrument, etc., can solve problems such as insufficient accuracy, troublesome operation, and inability to fully reflect the condition of cast iron, so as to ensure accuracy, improve testing rate, and measure The effect is simple and convenient

Inactive Publication Date: 2014-03-12
成都成工工程机械井研铸造有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The photo of the golden image is a certain surface of a certain position of the casting. For the three-dimensional casting, the degree of graphitization is detected by this method, which is a bit general. It can only provide the graphitization of a certain posi

Method used

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  • Detection method for degree of graphitization of cast iron

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Experimental program
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Effect test

Embodiment 1

[0031] Take the treated molten cast iron, pour it into the sand mold made by the sample mold, wait for the sample to cool, shot blast, polish the burrs, and then measure the weight with an electronic balance; then put the sample into a 500mml Put the water in a 1000ml measuring cup, then observe the scale line, and calculate the volume of the sample; divide the mass of the sample by the volume to get the density, and bring the density value into the formula to get the degree of graphitization of cast iron under this process condition.

[0032] Cast iron can be seen as a steel matrix mixed with graphite flakes (balls), so the matrix has the properties of steel. Knowing the influence value of the main elements in the steel on the steel density, the corresponding approximate value of the steel density can be obtained. Among them, the calculation formula is: r1=7.88+nDr.X%, among them, r1-steel density (g / cm 3 ), 7.88-the density of pure iron (g / cm 3 ), the change in density (g / ...

Embodiment 2

[0058] Take the treated molten cast iron and pour it into the sand mold made of the blackened sample mold and the white sample mold for spectral analysis. After the sample is cooled, the blackened sample is shot blasted and the flash is polished. Burr, then use an electronic balance to measure the weight; then put the sample into a 1000ml measuring cup filled with 500mml of water, then observe the scale line to calculate the volume of the sample; divide the mass of the sample by the volume to obtain the density. After the spectroscopic sample is polished, the composition of the molten iron is determined. Bring the density value and composition value into the formula to get the degree of graphitization of cast iron.

[0059] Among them, the calculation formula is: r=1 / ((1-a%G) / r1+a%G / 2.26)=1 / ((1-a%G) / (7.88-0.04a(1-G) / (1-a%G)-0.073b / (1-a%G)-0.016 c / (1-a%G)+a%m / 2.26), r is the density of cast iron, r1 is the density of steel (g / cm 3 ), the degree of graphitization is G, the ...

Embodiment 3

[0064] Take the treated molten cast iron, pour it into the sand mold made by the sample mold, wait for the sample to cool, shot blast, polish the burrs, and then measure the weight with an electronic balance; then put the sample into a 500mml Put the water in a 1000ml measuring cup, and then observe the scale line to calculate the volume of the sample; divide the mass of the sample by the volume to obtain the density, and bring the density value into the formula to obtain the degree of graphitization of cast iron.

[0065] Among them, the calculation formula is: r=1 / ((1-a%G) / r1+a%G / 2.26)=1 / ((1-a%G) / (7.88-0.04a(1-G) / (1-a%G)-0.073b / (1-a%G)-0.016 c / (1-a%G)+a%m / 2.26), r is the density of cast iron, r1 is the density of steel (g / cm 3 ), the degree of graphitization is G, the composition: C:a%, Si:b%, Mn:c%; from the above formula we can see that there are only 2 unknowns in the formula, we calculate the degree of graphitization in cast iron according to the matrix density , so ...

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Abstract

The invention belongs to the field of detection of degrees of graphitization, and particularly relates to a detection method for degree of graphitization of cast iron. The detection method is characterized by comprising the steps of weighing a cast iron sample, measuring the volume of the cast iron sample, calculating the density of the cast iron sample, calculating the degree of graphitization; through solving the density of the cast iron, reflecting a value, namely, the degree of graphitization, which is difficult to measure by density which is easily measured. The detection method is simple and convenient, and is popular and understandable in calculating principle. Only a key part of sampling the cast iron is needed in a measurement process, the volume and the weight are measured, the density is figured out, the degree of graphitization of the cast iron can be figured out according to a formula of r=1/((1-a%G)/r1+a%G/2.26=1/((1-a%G)/(7.88-0.04a(1-G)/(1-a%G)-0.073b/(1-a%G)-0.016c/(1-a%G)))+a%m/2.26), and thus the degree of graphitization of the cast iron is judged.

Description

technical field [0001] The invention belongs to the detection field of graphitization degree, in particular to a detection method of cast iron graphitization degree. [0002] Background technique [0003] The formation process of graphite in cast iron is called graphitization process, and the basic process of cast iron structure formation is the formation process of graphite in cast iron. The structure of cast iron depends on the degree of graphitization. In order to obtain the desired structure, the key is to control the degree of graphitization. Therefore, it is very important to understand the conditions and influencing factors of the graphitization process to master the structure and properties of cast iron materials. [0004] According to the dual state diagram of Fe-C alloy, the graphitization process of cast iron can be divided into three stages: the first stage is the liquid phase hypoeutectic crystallization stage. Including, direct crystallization of primary gra...

Claims

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Application Information

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IPC IPC(8): G01N9/02
Inventor 陈攀刘余松李勇
Owner 成都成工工程机械井研铸造有限责任公司
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