Method for detecting inclusions and air holes in aluminum alloy

A technology for aluminum alloys and inclusions, which is applied in the preparation of test samples, material resistance, etc., can solve the problems of low detection accuracy of inclusions and pores, and achieve the effect of simple and convenient implementation and high measurement accuracy

Inactive Publication Date: 2010-05-12
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for detecting inclusions and pores in aluminum alloys, which solves the problem of low detection accuracy of inclusions and pores in aluminum alloys

Method used

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  • Method for detecting inclusions and air holes in aluminum alloy
  • Method for detecting inclusions and air holes in aluminum alloy
  • Method for detecting inclusions and air holes in aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The technological process and steps of the present embodiment are as follows:

[0025] a Sample preparation: The experimental material is ADC12 aluminum alloy, and the melting temperature is 790 °C. The molten aluminum is purified by flux method. After adding flux, cast 3 samples, namely No. 1, No. 2 and No. 3. Two samples were poured before adding flux, namely No. 4 and No. 5. These five samples were made into strips with a size of 2mm×5mm×60mm.

[0026] b Coarse grinding-fine grinding: Grind the prepared sample on 200#, 400#, 600#, 800# sandpaper until there is no scratch on the surface of the sample, and keep the flatness of the sample as much as possible.

[0027] c measurement: due to the wear of the sample during the grinding process, the size should be measured again. Measure the width and height of the sample with a vernier caliper, and record it in Table 1:

[0028] Table 1 The cross-sectional length and width of the sample

[0029] Sample No

...

Embodiment 2

[0039] The technological process and steps of the present embodiment are as follows:

[0040] a Sample preparation: The experimental material is ADC12 aluminum alloy, and the melting temperature is 790 °C. The molten aluminum was purified by the flux method, and a sample was poured before and after purification. These two samples were made into strips with a specification of 2mm×5mm×60mm.

[0041] b Coarse grinding-fine grinding: Grind the prepared sample on 200#, 400#, 600#, 800# sandpaper until there is no scratch on the surface of the sample, and keep the flatness of the sample as much as possible.

[0042] c measurement: due to the wear of the sample during the grinding process, the size should be measured again. Measure the width and height of the sample with a vernier caliper, and calculate the actual cross-sectional area of ​​the sample.

[0043] d Measure the resistivity of the sample with an alloy resistivity measuring device. The prepared samples were heated in a...

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Abstract

The invention relates to a method for detecting inclusions and air holes in an aluminum alloy and belongs to the technical field of inclusion and air hole detection. The method comprises the following steps of sample preparation, rough grinding, fine grinding and measurement. A cast aluminum alloy sample is made into a lath shape or a round rod shape of a certain specification; the prepared sample is ground on a sand paper until the surface of the sample has no scratches, and flatness of the sample is kept as much as possible; the section area of the sample is computed; and electrical resistivity of the sample is measured through an alloy electrical resistivity measuring device, and inclusion contents of the sample are computed by contrasting. The method has the advantages of solving the problem of low accuracy of the inclusion and the air hole detection in the aluminum alloy, and quantitatively computing the inclusion contents. The method has simple and convenient operation, and high measuring accuracy.

Description

technical field [0001] The invention relates to a method for detecting inclusions and pores in aluminum alloys, belonging to the technical field of aluminum alloy detection. Background technique [0002] Except for a small amount of inclusions in aluminum alloys brought in by production equipment and processes, the main reason is that the chemical properties of aluminum are very active and can react with many elements. Aluminum in the molten state is more likely to react with oxygen and nitrogen. , sulfur, carbon and other elements combine to form non-metallic inclusions and oxide films, and these inclusions seriously endanger the performance of aluminum alloys. The inclusions in the aluminum alloy reduce the mechanical properties of the aluminum alloy, especially the fatigue performance, reduce the impact toughness and elongation, reduce the fluidity of the melt, deteriorate the cutting performance, and promote the cracking of the casting during processing. [0003] The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/20G01N1/28
Inventor 张恒华龚致礽戴兵金曼邵光杰
Owner SHANGHAI UNIV
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