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A method for making a standard sample map for the detection of over-fired structure of magnesium alloy castings

A magnesium alloy, metallographic detection technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of over-burning, mechanical property decline, no metallographic detection and analysis, etc., and achieve detection and analysis results Accurate and improve the effect of product quality

Active Publication Date: 2015-08-19
GUIZHOU ANJI AVIATION PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesium alloy castings have been widely used in the aviation field, and if the temperature of the castings is not only controlled during the heat treatment process or the temperature deviation in the furnace is large, when the limit solid solution temperature is exceeded, the castings are prone to overburning. When the castings are overburned, With the aggravation of overburning, the mechanical properties of castings are affected to varying degrees, and the mechanical properties drop sharply when overburning is severe
In order to ensure the stability and safety of magnesium alloy castings in the aviation field, it is necessary to carry out burnt microstructure testing on castings, but currently my country has not established relevant standards for evaluating the burnt microstructure of magnesium alloy castings by metallographic testing. In the existing technology, there is no standard sample diagram for metallographic detection and analysis

Method used

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  • A method for making a standard sample map for the detection of over-fired structure of magnesium alloy castings
  • A method for making a standard sample map for the detection of over-fired structure of magnesium alloy castings
  • A method for making a standard sample map for the detection of over-fired structure of magnesium alloy castings

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Embodiment 1

[0024] Such as Figure 1 to Figure 4 As shown, a method for making a standard sample diagram for the detection of overfired structure of magnesium alloy castings mainly includes the following steps:

[0025] (1) According to each batch of 10-12 single-cast magnesium alloy mechanical properties samples, a total of four batches were taken and placed in temperature chambers at temperatures above 410°C-420°C, 420°C-425°C, 425°C-430°C, and 435°C. Solid solution treatment in the furnace;

[0026] (2) Mark the samples after solid solution treatment, conduct mechanical property tests at room temperature, record the strength limit range and elongation range of each solid solution temperature mechanical property test, and classify according to the solid solution temperature range ;

[0027] (3) Mark the samples that have been sorted after the mechanical test to make metallographic samples. After corrosion, observe under the optical microscope at 200-400 times magnification, and take p...

Embodiment 2

[0036] A method for making a standard sample diagram for detection of burnt structure of magnesium alloy castings, mainly comprising the following steps:

[0037] (1) According to each batch of 12 single-cast magnesium alloy mechanical properties samples, a total of four batches were taken and placed in furnaces at 415°C, 422°C, 430°C, and 435°C for solution treatment;

[0038] (2) Mark the samples after solid solution treatment, and conduct mechanical property tests at room temperature according to HB5413-80 "Metal Tensile Test Method at Room Temperature", and record the strength limit range and extension of each solid solution temperature mechanical property test Rate size range, and classified according to the solid solution temperature range;

[0039] (3) Mark the samples that have been sorted after the mechanical test to make metallographic samples, and observe them under an optical microscope at a magnification of 400 times after corrosion, and take a picture of the meta...

Embodiment 3

[0047] A method for making a standard sample diagram for detection of burnt structure of magnesium alloy castings, mainly comprising the following steps:

[0048] (1) According to each batch of 10 single-cast magnesium alloy mechanical properties samples, a total of four batches were taken and placed in furnaces at temperatures above 420°C, 425°C, 430°C, and 440°C for solution treatment;

[0049] (2) Mark the samples after solid solution treatment, conduct mechanical property tests at room temperature, record the strength limit range and elongation range of each solid solution temperature mechanical property test, and classify according to the solid solution temperature range ;

[0050] (3) Mark the samples that have been sorted after the mechanical test to make metallographic samples, and after corrosion, observe them under an optical microscope with a magnification of 300-400 times, and take a picture of the metallographic structure;

[0051] (4) Combining the mechanical pr...

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Abstract

The invention discloses a manufacturing method of a magnesium alloy casting overburnt structure detection standard sample diagram, which comprises the following steps: taking four single-cast magnesium alloy mechanical property samples, and respectively performing solid solution treatment in furnaces of which the temperatures are 410-420 DEG C, 420-425 DEG C, 425-430 DEG C and above 435 DEG C; performing mechanical tests at room temperature, marking the classified samples after the mechanical tests, manufacturing into metallographic samples, corroding, observing under an optical microscope at an amplification factor of 200-400, and taking structure metallographic pictures; and selecting the metallographic pictures as an overburnt structure detection standard sample diagram in the solid solution temperature range according to the structure metallographical overburning degree, and using the detection standard sample diagram to perform contrastive analysis on structure metallography of a casting, thus effectively determining whether the casting structure is overburnt and improving the product quality of the casting.

Description

technical field [0001] The invention belongs to the technical field of material detection, and in particular relates to the detection of burnt metallographic structure of magnesium alloy castings. Background technique [0002] Magnesium alloy castings have been widely used in the aviation field, and if the temperature of the castings is not only controlled during the heat treatment process or the temperature deviation in the furnace is large, when the limit solid solution temperature is exceeded, the castings are prone to overburning. When the castings are overburned, With the aggravation of overburning, the mechanical properties of castings are affected to varying degrees, and the mechanical properties drop sharply when overburning is severe. In order to ensure the stability and safety of magnesium alloy castings in the aviation field, it is necessary to carry out burnt microstructure testing on castings. At present, there is no relevant standard for evaluating the burnt st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/00
Inventor 杨朝荣饶英蔡大明
Owner GUIZHOU ANJI AVIATION PRECISION CASTING