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Method for accurately measuring an effective solidification interval of cast magnesium alloy

A technology for casting magnesium alloys and solidification interval, which is applied in the field of casting magnesium alloys and can solve problems such as hot cracks, insufficient strength at grain boundaries to resist shrinkage stress, and it is difficult to accurately measure the final solidification temperature of the alloy.

Pending Publication Date: 2021-09-28
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small amount of eutectic liquid phase will wet the grain boundary, hinder the intergranular bridging, reduce the intergranular bonding force, so that the grain boundary will not have enough strength to resist shrinkage stress, which will lead to the generation of thermal cracks
[0004] The solidification temperature range of the alloy can usually be determined by differential thermal analysis, but it is difficult to accurately determine the final solidification temperature of the alloy due to the very small eutectic content in the later stage of solidification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Determination of effective solidification interval of cast magnesium alloy AZ91:

[0023] 1. Measure the initial solidification temperature T of the alloy by differential thermal analysis L and solidification end temperature T S , the heating / cooling rate is controlled at 6K / min; the measured initial solidification temperature T of AZ91 L is 590°C, the solidification end temperature T S It is 430°C.

[0024] 2. The final solidification temperature of the alloy is determined by the evaluation method of heating, heat preservation and rapid cooling: the solidification end temperature T determined by the differential heat method S (430°C) as the benchmark, first select the holding temperature T S -5°C, T S -10°C, T S -20°C, T S -50°C, T S One of -100°C, re-interpolate the holding temperature value between different temperature values ​​according to the test results, the temperature interpolation range is 2-5°C, specifically:

[0025] Put the sample into a graphite ...

Embodiment 2

[0028] Determination of effective solidification range of cast magnesium alloy ZK60:

[0029] 1. Measure the initial solidification temperature T of the alloy by differential thermal analysis L and solidification end temperature T S , the heating / cooling rate is controlled at 5-10K / min; the measured initial solidification temperature T of ZK60 L is 626°C, the solidification end temperature T S It is 425°C.

[0030] 2. The final solidification temperature of the alloy is determined by the evaluation method of heating, heat preservation and rapid cooling: the solidification end temperature T determined by the differential heat method S (425°C) as the benchmark, first select the holding temperature T S -5°C, T S -10°C, T S -20°C, T S -50°C, T S One of -100°C, re-interpolate the holding temperature value between different temperature values ​​according to the test results, the temperature interpolation range is 2-5°C, specifically:

[0031] Put the sample into a graphite ...

Embodiment 3

[0034] Determination of effective solidification interval of cast magnesium alloy EW75:

[0035] 1. Measure the initial solidification temperature T of the alloy by differential thermal analysis L and solidification end temperature T S , the heating / cooling rate is controlled at 5-10K / min; the measured initial solidification temperature T of EW75 L is 610°C, the solidification end temperature T S is 370°C.

[0036] 2. The final solidification temperature of the alloy is determined by the evaluation method of heating, heat preservation and rapid cooling: the solidification end temperature T determined by the differential heat method S (370°C) as the benchmark, first select the holding temperature T S -5°C, T S -10°C, T S -20°C, T S -50°C, T S One of -100°C, re-interpolate the holding temperature value between different temperature values ​​according to the test results, the temperature interpolation range is 2-5°C, specifically:

[0037]Put the sample into a graphite b...

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Abstract

The invention aims to provide a method for accurately measuring an effective solidification interval of a cast magnesium alloy. The method specifically comprises the following steps: firstly, determining an initial solidification temperature TL and a solidification end temperature TS of the alloy by adopting a differential thermal analysis method; and then measuring the final solidification temperature of the alloy by adopting a heating, heat preservation and quenching structure evaluation method with the solidification finishing temperature TS as the reference, wherein the difference value between the initial solidification temperature and the final setting temperature is the effective solidification temperature interval of the alloy. Compared with the prior art, the method can more accurately reflect the hot crack forming tendency of different cast magnesium alloys, and can be used for evaluating the engineering capability of the cast alloys.

Description

technical field [0001] The invention belongs to the field of cast magnesium alloys, and in particular provides an accurate measurement method for the effective solidification range of cast magnesium alloys. Background technique [0002] Magnesium alloys are widely used in aerospace, automotive and 3C industries due to their advantages such as low density, high specific strength, strong damping and good noise reduction. Due to the poor casting performance of magnesium alloy itself, it is easy to form defects such as hot cracking and cold shutting, which limits its wide application, especially the production of large magnesium alloy thin-walled castings is still facing great challenges. Hot cracking defect is one of the most serious defects in castings. Very small microcracks will greatly reduce the service life of parts, and even lead to the direct scrapping of parts. The hot cracking resistance of cast magnesium alloys is a key indicator of whether castings can be mass-produ...

Claims

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Application Information

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IPC IPC(8): G01N25/06
CPCG01N25/06
Inventor 毛萍莉朱训明刘丹段军鹏王志周乐
Owner SHENYANG POLYTECHNIC UNIV