Method for manufacturing cast magnesium alloy

A technology for casting magnesium alloys and a manufacturing method, which is applied in the field of high specific strength and heat-resistant casting magnesium alloys, can solve the problems of high density, insufficient heat resistance, low room temperature elongation, etc., and achieves low segregation and crack tendency, high heat resistance Good performance and heat resistance

Inactive Publication Date: 2010-06-23
SHANGHAI SPACE PRECISION MACHINERY RES INST +1
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high cost, higher density, low elongation at room temperature, insufficient heat resistance, and environmental pollution of cast magnesium alloys produced in the prior art, the purpose of the present invention is to provide a method for manufacturing cast magnesium alloys. method

Method used

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Embodiment Construction

[0028] Taking smelting 200kg raw material as an example below, the manufacturing method of the cast magnesium alloy of the present invention is described in detail, and the method comprises the following steps:

[0029] Step 1: Ingredients, including:

[0030] 1-1 According to alloy chemical composition requirements and element burning law, calculate the required percentage of each element as follows (wt%): 9.0~12.5Gd, 2.8~4.5Y, 0.4~1.0Zr, and the rest is Mg. In the embodiment of the present invention, the percentage content of the above elements is preferably: 12Gd, 5Y, 1.5Zr, and the balance is Mg.

[0031] 1-2 Calculate the weight of each element required for 200kg of raw materials according to the required percentage of each element, as follows: Gd: 24kg; Y: 10kg; Zr: 3kg; Mg: 163kg.

[0032] 1-3 The raw materials used are Mg, Mg-25wt%Gd, Mg-25wt%Y, Mg-30wt%Zr. Calculate the weight of the respective ingredients. Mg-25wt%Gd: 96kg; Mg-25wt%Y: 40kg; Mg-30wt%Zr: 10kg; Mg: 5...

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Abstract

The invention discloses a method for manufacturing cast magnesium alloy, omprising the steps: 1, batching: calculating the percentage of elements including Gd, Y, Zr, and Mg as balance; calculating the weight and the respective batching weight of elements; 2: smelting: adding in sequence Mg, Mg-Gd, Mg-Y and Mg-Zr with Gd, Y and Zr as intermediate alloy; feeding in SF6/CO2 protective gas for refining; dredging up dregs at the bottom of a crucible, then reheating the crucible to 780-800 DEG C, standing the crucible for 30 minutes under heat preservation, and cooling the crucible to 730-740 DEG C along with furnace and subsequently removing scum on the surface; 3: pouring: preheating a mould, adjusting the temperature of magnesium alloy melt and pouring; 4: heat treatment, including: solution treatment and aging treatment. Solving the problems of high cost, low elongation percentage, inadequate heat resistance of the manufactured material, environmental pollution and the like, the method obtains the effect of high strength, good heat resistance, small tendency of incompactness, segregation and crack of the manufactured material.

Description

technical field [0001] The invention relates to a manufacturing method of a cast alloy material, in particular to a high specific strength heat-resistant cast magnesium alloy used in industries such as aerospace and aviation. Background technique [0002] The cast magnesium alloy manufactured in the prior art has the problems of low strength and insufficient heat resistance. For example, WE54 is a typical high-strength heat-resistant magnesium alloy, the chemical composition is Mg-(4.75~5.5)%Y-(2.0~4.0)%RE-(0.4~1.0)%Zr, and its room temperature tensile strength is 250MPa. The temperature is about 200-250°C. [0003] In order to improve the quality of the above materials, Th is added to magnesium alloy instead of RE, so that it has good mechanical properties above 300 °C, but it loses its competitive advantage due to the environmental pollution caused by Th, and becomes an eliminated alloy. The recently developed Mg-20%Gd, Mg-20%Tb heat-resistant magnesium alloys have a ten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/03C22C23/00B22D21/04C22F1/06
Inventor 陈斌吴国华侯正全丁文江李宝辉迟秀梅邱立新
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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