Pulse current assisted aluminum alloy homogenization heat treatment method

A technology of homogenizing heat treatment and pulse current, which is applied in the field of metal alloy manufacturing process, can solve the problems of energy loss, difficult to eliminate, over-burning, etc., and achieve the effects of reducing energy consumption, promoting elimination, and increasing the homogenization temperature

Inactive Publication Date: 2014-11-12
GUIZHOU UNIV
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  • Application Information

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Problems solved by technology

However, the general homogenization heat treatment process conditions can only eliminate some conventional low melting point alloy compounds, and it is difficult to eliminate the adverse effects of these high hardness, high melting point intermetallic compounds. If the homogenization heat treatment temperature and time are increased, on the one hand, The loss of energy consumption, on the other hand, it is easy to overheat or even burn in some areas of the ingot / casting, seriously affecting the overall performance

Method used

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Examples

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Effect test

Embodiment 1

[0012] Example 1: Use copper plates and copper cables to connect the workpiece and the pulse current generator, and keep warm in a heat treatment furnace. According to the properties of the aluminum alloy, the soft aluminum alloy can be homogenized at a conventional heat treatment temperature, and the hard aluminum alloy can be homogenized at a lower than conventional homogenization temperature. The heat treatment temperature is 5-15°C. The passing time of the pulse current is after the workpiece reaches the homogenization heat treatment temperature, and the holding time reaches 30% to 70% of the total time of the conventional homogenization of the alloy. (For example, the total holding time for conventional homogenization heat treatment of an alloy is 30 hours, and the workpiece is heated for 9 to 21 hours and then pulsed current is applied. Pulse current parameters: pulse frequency 10-50Hz, current density 1000-2000A / cm 2 . After the time is up, the product can be obtained ...

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PUM

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Abstract

The invention discloses a pulse current assisted aluminum alloy homogenization heat treatment method. The method is characterized in that an alloy workpiece is connected with a current generation device, and the alloy workpiece undergoes heat insulation in a heat treatment furnace; a heat insulation temperature is a routine homogenization heat treatment temperature or is 5-15DEG C lower than the routine homogenization heat treatment temperature; a pulse current is applied to the alloy workpiece when a heat insulation time reaches 30-70% of a total routine alloy homogenization heat time; and after the treatment time of the alloy workpiece reaches the total routine homogenization time, power-off and discharge from the furnace are sequentially carried out. The method respectively considers the phases with different properties in the cast state of an aluminum alloy, and utilizes the Peltier heat effect and parts of joule heat of the interface of a current flowing substrate and an intermetallic compound after the solid solution of low melting point compounds in the cast is full in the homogenization heat treatment process in order to promote the elimination of a sharp interface between a high melting point phase and the aluminum alloy substrate.

Description

technical field [0001] The invention relates to a new technology for thermal processing of aluminum alloys, in particular to a process method for performing auxiliary homogenization heat treatment on aluminum alloy castings or ingots, and belongs to the field of metal alloy manufacturing processes. Background technique [0002] During the aluminum alloy casting process, according to the non-equilibrium solidification characteristics of the ingot, dendrite segregation or even macro segregation is easy to form in the ingot / casting, and alloy compounds are formed on the grain boundary, resulting in uneven structure and composition of the ingot. Greatly affects the performance of the ingot. Therefore, for ingots that need further pressure processing or some castings that need to be stressed, it is generally necessary to perform a homogenization annealing first to eliminate the segregation of various elements, so that the ingot / casting structure is uniform, and the pressure is el...

Claims

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Application Information

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IPC IPC(8): C22F1/04C22F3/00
Inventor 梁宇梁益龙孙中源余凌锋石芷伊
Owner GUIZHOU UNIV
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