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Method for reducing micro-segregation in alloy solidification process

An alloy and micro technology, applied in the field of alloy processing, can solve the problems of easily polluted alloy system, equipment and harsh processing conditions.

Inactive Publication Date: 2019-08-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although rapid solidification technology can significantly improve microscopic segregation, it can only prepare materials with small sizes such as thin strips and particles, and is harsh on equipment and processing conditions; electromagnetic oscillation technology needs to insert electrodes into the metal melt, which is easy to contaminate the alloy system

Method used

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  • Method for reducing micro-segregation in alloy solidification process
  • Method for reducing micro-segregation in alloy solidification process
  • Method for reducing micro-segregation in alloy solidification process

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preparation example Construction

[0025] In the present invention, the preparation method of the Al-Cu alloy melt preferably comprises the following steps:

[0026] In a magnetic field, the Al-Cu alloy raw material is homogenized to obtain an Al-Cu alloy melt.

[0027] In the present invention, the preparation method of the Al-Cu alloy melt is preferably in such as figure 1 in the device shown. The specific process is preferably as follows: in a magnetic field, the Al-Cu alloy raw material is placed at the position shown in the alloy sample 3, and the temperature controller 2 is used to control the silicon carbon heating tube 4 to homogenize the Al-Cu alloy raw material.

[0028] In the present invention, the magnetic field is preferably a steady-state magnetic field, and the magnetic field strength of the steady-state magnetic field is preferably 0.01-12T.

[0029] In the present invention, the process of the homogenization treatment is preferably as follows: at a heating rate of 8-12°C / min, the temperature...

Embodiment 1

[0034] Under the action of a 5T steady-state magnetic field, the Al-4.5wt% Cu alloy raw material is placed at the position shown in the alloy sample 3, and the silicon carbon heating tube 4 is controlled by the temperature controller 2 at a heating rate of 10 °C / min. Al-4.5wt% Cu alloy raw materials were heated to 950°C (the liquidus temperature was 648°C) for homogenization treatment for 40min to obtain Al-4.5wt%Cu alloy melt;

[0035] Under the action of the above-mentioned steady-state magnetic field, the Al-4.5wt% Cu alloy melt is drawn into the Ga-In-Sn liquid alloy at a rate of 10 μm / s until it is completely solidified (the temperature gradient at the solid / liquid interface is 100K / cm), to obtain Al-4.5wt% Cu alloy.

Embodiment 2

[0037] Under the action of a 5T steady-state magnetic field, the Al-2wt% Cu alloy raw material is placed at the position shown in the alloy sample 3, and the silicon carbon heating tube 4 is controlled by the temperature controller 2 to heat the Al at a rate of 10 °C / min. The -2wt% Cu alloy raw material is heated to 950°C (the liquidus temperature is 656°C) for homogenization treatment for 60 minutes to obtain an Al-2wt% Cu alloy melt;

[0038] Under the action of the above-mentioned steady-state magnetic field, the Al-2wt% Cu alloy melt is drawn into the Ga-In-Sn liquid alloy at a rate of 10 μm / s until it is completely solidified (the temperature gradient at the solid / liquid interface is 101K / cm), to obtain Al-2wt% Cu alloy.

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Abstract

The invention relates to the technical field of alloy machining, in particular to a method for reducing micro-segregation in an alloy solidification process. The method for reducing micro-segregationin the alloy solidification process comprises the following step of directionally solidifying Al-Cu alloy melt in a steady magnetic field to obtain an Al-Cu alloy. According to the embodiment, the amount of non-equilibrium second phase (Al2Cu) of the Al-Cu alloy treated according to the method is obviously reduced, solute distribution is more uniform, and micro-segregation is reduced.

Description

technical field [0001] The invention relates to the technical field of alloy processing, in particular to a method for reducing micro-segregation during alloy solidification. Background technique [0002] Microsegregation during alloy solidification is the difference in chemical composition at the dendrite scale due to the difference in solubility of solutes in the solid and liquid phases. Micro-segregation has a very important impact on the performance of castings, for example: (1) the precipitation of non-equilibrium second phase will reduce the mechanical properties of castings and increase their hot cracking tendency; (2) the uneven chemical composition will lead to corrosion resistance of castings (3) The uneven distribution of the precipitated phase after heat treatment reduces the fatigue resistance of the casting; (4) The low melting point phase formed at the grain boundary will also limit the heat treatment temperature and service temperature of the casting. Theref...

Claims

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Application Information

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IPC IPC(8): C22F3/02C22C21/12
CPCC22C21/12C22F3/02
Inventor 李传军任忠鸣何盛亚
Owner SHANGHAI UNIV
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