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Thermal treatment method of MgYNdZr alloy

A heat treatment method and alloy technology, which is applied in the field of heat treatment of MgYNdZr alloys, can solve the problems of low pass rate, inability to adapt to factory production, and inability to meet the requirements of castings, and achieve the effect of stable performance

Inactive Publication Date: 2014-10-22
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The WE43A alloy material treated by the above process can meet the mechanical properties at room temperature for individual materials, but the pass rate is extremely low, which cannot be adapted to factory production and cannot meet the requirements of castings under heavy load conditions.

Method used

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Embodiment

[0024] For the heat treatment of a main case casting, the material is WE43A alloy. It is required that the critical area of ​​the part after heat treatment is at room temperature, and the mechanical properties σb≥250MPa, σ0.2≥185MPa, δ4≥4%. The specific implementation steps are as follows:

[0025] (1) Use chromate to protect the surface of the WE43A alloy material to ensure that the material is dry and free of magnesium chips and oil stains;

[0026] (2) Divide the mixture of ferrous sulfide and sulfur powder with a weight ratio of 12:1 into several containers, and place them evenly around the well-type sealed resistance furnace. The well-type sealed resistance furnace has a control Temperature instrument and fan, and the temperature in the furnace is evenly distributed between ±5°C;

[0027] (3) Place the material to be heat treated stably on the heat treatment pallet;

[0028] (4) Lift the heat treatment pallet into the furnace smoothly, and cover the furnace cover;

[00...

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Abstract

The invention relates to a thermal treatment method of an MgYNdZr alloy. A uniform furnace temperature in a furnace is ensured by utilizing a fan through regulating thermal treatment parameters, heating and uniformly cooling are carried out twice, thereby ensuring that elements such as strengthening phases zirconium, yttrium are sufficiently dissolved in a matrix, so that effects of the strengthening phases are brought into play to the greatest extent. The thermal treatment method disclosed by the invention guarantees thermal treatment effects of the MgYNdZr alloy, so that after the material thermal treatment, room-temperature mechanical performances meet the following requirements: sigma b is not less than 250MPa, sigma 0.2 is not less than 185MPa, and sigma 4 is not less than 4%, and an qualification rate is over 80%; and moreover, performances of the MgYNdZr alloy are stable, and application requirements of casting pieces under a great-load condition are satisfied.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method of MgYNdZr alloy. Background technique [0002] MgYNdZr alloy is a high-strength magnesium alloy, commonly known as WE43A alloy in the industry, and it is a material that is more and more widely used at present. In some fields, such as the aerospace field, it is required that the mechanical properties of the material at room temperature after heat treatment σb≥250MPa, σ0.2≥185MPa, δ4≥4%, in order to meet the use requirements. At present, in order to achieve the above indicators, the heat treatment of this material is usually carried out by solid melting and aging, that is, to prevent the alloy from oxidizing and burning, the surface of the alloy is protected by chromate, and a mixture of ferrous sulfide and sulfur powder is used in the heat treatment furnace. Gas protection. The current heat treatment parameters of WE43A alloy in the laboratory are: solid solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 刘一军李洋杨光山刘洪汇
Owner HARBIN DONGAN ENGINE GRP
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