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Heat treatment method of DKM7 alloy

A heat treatment method and alloy technology, which is applied in the field of alloy heat treatment, can solve the problems of reduced corrosion resistance and achieve good corrosion resistance

Pending Publication Date: 2022-06-21
HEBEI GANGYAN DEKAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The DKM7 alloy contains gadolinium, and the addition of gadolinium element reduces the potential of magnesium, but there are precipitates of gadolinium in the magnesium alloy, and the precipitates will form a second phase, which will react with magnesium to form a galvanic cell, so T6 heat treatment is carried out. Corrosion resistance will be reduced

Method used

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  • Heat treatment method of DKM7 alloy
  • Heat treatment method of DKM7 alloy

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preparation example Construction

[0035] In one embodiment, the DKM7 alloy is mainly composed of the following components by mass percentage: Gd 2.1%-2.5%, Zr 0.5%-1.0%, Zn 0.3%-0.6%, Nd 2.7%-3.1%, and the remainder amount of Mg and inevitable impurities. The preparation method of DKM7 specifically includes the following steps: using magnesium, zinc, magnesium-gadolinium master alloy, magnesium-zirconium master alloy and magnesium-neodymium master alloy as raw materials, and after proportioning proportions, smelting and casting. For details of the composition of DKM7 alloy, please refer to the patent application with the application number of 202110693616.1.

[0036] In one embodiment, DKM7 is mainly composed of the following components in mass percent: Gd 2.2%, Zr 0.55%, Zn 0.4%, Nd 2.9%, balance Mg and inevitable impurities.

[0037] In the present invention, by adopting a specific solution treatment temperature, holding time, and using water for cooling, the eutectic phase is dissolved into the magnesium m...

Embodiment 1

[0070] The heat treatment method of DKM7 casting includes the following steps:

[0071] 1. Inspection before heat treatment

[0072] (1) Inspection of heat treatment equipment: check the working status of heating furnace, temperature measurement and temperature control instrument, thermocouple, compensation line, crane and other equipment before use.

[0073] (2) Requirements for castings before heat treatment: There should be no magnesium chips, burrs, oil stains, etc. on the surface of castings before furnace loading, so as to ensure that the castings are clean and dry before entering the furnace.

[0074] 2. Furnace

[0075] (1) When the castings are loaded into the furnace, they should be placed on the hanger smoothly and adjusted so as not to shake to prevent the castings from being deformed during heat treatment, and to ensure that the atmosphere in the furnace is fully circulated. The placement method is implemented according to the requirements of the technical card. ...

Embodiment 2

[0087] The heat treatment method of DKM7 castings is the same as in Example 1, except that the temperature is raised to 524°C and the temperature is kept at 524°C for 17 hours.

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Abstract

The invention relates to the technical field of alloy heat treatment, in particular to a heat treatment method of DKM7 alloy. The invention relates to a heat treatment method of a DKM7 alloy, which comprises the following steps: carrying out solution treatment on the DKM7 alloy, and then cooling with water; the temperature of the solution treatment is 524 to 527 DEG C; and the heat preservation time of the solution treatment is 12-18 hours. According to the method, specific solution treatment temperature and heat preservation time are adopted, water is adopted for cooling, an eutectic phase enters a magnesium matrix in a solid solution mode to the maximum extent, precipitation products are as few as possible, battery reaction is not generated as far as possible, and the corrosion resistance of the treated DKM7 alloy is better.

Description

technical field [0001] The invention relates to the technical field of alloy heat treatment, in particular to a heat treatment method of DKM7 alloy. Background technique [0002] DKM7 alloy contains gadolinium. The addition of gadolinium element reduces the potential of magnesium, but gadolinium has precipitates in magnesium alloys, and the precipitates will form a second phase, which will react with magnesium to form a primary battery, so T6 heat treatment is performed, which Corrosion resistance will be reduced. How to heat treat DKM7 alloy to obtain more excellent corrosion resistance is very important. [0003] In view of this, the present invention is proposed. SUMMARY OF THE INVENTION [0004] One object of the present invention is to provide a heat treatment method for DKM7 alloy, by adopting a specific solution treatment temperature, holding time, and cooling with water, the eutectic phase is dissolved into the magnesium matrix to the greatest extent, and the pre...

Claims

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Application Information

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IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 邵冲吴海龙郑宗文朱小平王凯杨武强张国驰邢昌勇莫雪妍贾林玥朱春雷
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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