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Method for improving thermal cracking tendency of ZL205A alloy based on nano Y2O3 particles

A ZL205A, hot cracking tendency technology, applied in the field of improving the hot cracking tendency of ZL205A alloy based on nanoparticles, can solve the problems of large addition amount, high temperature requirements, complicated operation, etc., and achieves reduced hot cracking tendency and fine grain size. The effect of homogenization and tissue homogenization

Inactive Publication Date: 2019-07-12
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the existing relevant literature, it was found that the method disclosed in Chinese patent CN104593628A prepared micro-nano TiB containing 2 Particles with low thermal cracking tendency ZL205A composite material, the preparation method has a limited tendency to reduce thermal cracking tendency, and its preparation raw material is potassium fluoroborate ( KBF 4 ) and potassium fluorotitanate ( K 2 TiF 6 ), the operation is relatively cumbersome, the temperature requirement is high, the gas generated during the chemical reaction process pollutes the human body and the atmospheric environment, the cost of chemical reagents is high, and the addition amount is large
Meanwhile current Nano Y 2 o 3 The effect of particles on the properties and microstructure of ZL205A alloy has not been reported yet, and of course there has been no research on its hot cracking tendency

Method used

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  • Method for improving thermal cracking tendency of ZL205A alloy based on nano Y2O3 particles
  • Method for improving thermal cracking tendency of ZL205A alloy based on nano Y2O3 particles
  • Method for improving thermal cracking tendency of ZL205A alloy based on nano Y2O3 particles

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Embodiment 1

[0022] According to the ratio, the nano Y content will account for 0.2% of the total mass of ZL205A alloy 2 O 3 After the pellets are placed in a drying oven at 250°C for two hours, they are wrapped in aluminum foil with a size of 0.1*20*30mm into multiple small aluminum foil packages, and added to the molten 2.5Kg ZL205A alloy in multiple additions. After stirring evenly, put the crucible containing the semi-solid alloy in a resistance furnace at 750℃ to heat and stir. After the adding process is completed, stir evenly and keep it for 30 minutes, remove the residual slag on the surface, and then add The alloy melt of the pellets is kept for 30 minutes and stirred, and then poured into a CRC mold that has been preheated at a constant temperature of 250°C for two hours in the drying box at a temperature of 730°C to obtain an alloy that can improve the hot cracking tendency of ZL205A alloy Alloy material, the grain structure of the alloy material is uniform and refined compared to...

Embodiment 2

[0024] According to the ratio, the nano Y content will account for 0.5% of the total mass of ZL205A alloy 2 O 3 The pellets are placed in a drying box and kept at 250℃ for two hours, wrapped in aluminum foil with a size of 0.1*20*30mm into multiple small aluminum foil packages, and added to the molten 2.5Kg ZL205A alloy melt in multiple additions. After stirring evenly, put the crucible containing the semi-solid alloy in a resistance furnace at 750℃ to heat and stir. After the addition process is completed, stir evenly and keep it for 30 minutes, remove the residual slag on the surface, and then add the particles After the alloy melt is kept for 30 minutes and stirred, it is poured into the CRC mold which has been preheated at a constant temperature of 250°C for two hours in the drying box at a temperature of 730°C to obtain an alloy material that can improve the hot cracking tendency of ZL205A alloy. The grain structure is uniform and refined compared to the base ZL205A alloy; ...

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Abstract

The invention discloses a method for improving the thermal cracking tendency of a ZL205A alloy based on nano Y2O3 particles. The method includes the following steps that the ZL205A aluminum alloy is placed in a crucible, heated to 720-750 DEG C and placed under a room temperature environment after being melted, and stirred constantly, when an alloy melt is in the molten state, the nano Y2O3 particles are added into the melt through an extra addition method and stirred evenly, the crucible filled with the semi-solid alloy is heated in a 750 DEG C resistance furnace and stirred for 30 min, thenresidue slag is completely removed from the surface, then the alloy melt added with the particles is subjected to heat preservation at 750 DEG C for 30 min and stirred, and poured into a CRC mold which is preheated at the constant temperature of 250 DEG C for two hours in a drying box when the temperature is 730 DEG C, and the ZL205A alloy can be obtained. According to the method for improving thethermal cracking tendency of the ZL205A alloy based on the nano Y2O3 particles, the preparation process requirements are simple, the preparation efficiency is high, the cost is low, the thermal cracking tendency of the ZL205A alloy in the casting process can be significantly lowered, and thus the finished product ratio is increased.

Description

Technical field [0001] The invention relates to the field of material preparation, in particular to a method for improving the thermal cracking tendency of ZL205A alloy based on nanoparticles. Background technique [0002] With the development of the aerospace and aviation industry, people have higher and higher requirements for aluminum alloy materials used in aerospace and aviation. At the same time, higher strength aluminum alloy materials have received more and more attention from all walks of life. The ZL205A alloy in the Al-Cu alloy series is a representative of high-strength cast aluminum alloys independently developed by my country. It is also one of the higher-strength cast aluminum alloys in the world’s industrial production. It has many advantages and is widely used in large military equipment, Automobile industry, construction machinery, civil equipment, medical equipment and other industries. However, due to the wide crystallization temperature range of Al-Cu series ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/02
CPCC22C1/1036
Inventor 张晓波李东张潇万雄斌冯佰刚张全鑫任军强陈东
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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