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Heat treatment method for heat-resistant cast magnesium alloy material

A technology of casting magnesium alloy and heat treatment method, which is applied in the field of heat treatment of heat-resistant casting magnesium alloy materials, can solve the problems of limiting the application of heat-resistant magnesium alloy materials, rare earth magnesium alloys are difficult to meet the requirements, and cannot meet the requirements of high-end castings, etc., to achieve finished products High efficiency, high uniformity, good heat resistance

Inactive Publication Date: 2019-01-01
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the average value of the tensile properties of the casting body at room temperature can reach R m =250MPa, R 0.2 =178MPa, A=3%, the average value of tensile properties at 250°C reaches R m =210MPa, R 0.2 =150MPa, A=12%, but still can not meet the requirements of some high-end castings
This greatly limits the application of heat-resistant magnesium alloy materials in the development and equipment of high-performance castings
[0004] At present, major equipment and new models of products have put forward higher performance indicators for cast magnesium alloy materials, and the existing rare earth magnesium alloys have been difficult to meet the requirements

Method used

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  • Heat treatment method for heat-resistant cast magnesium alloy material
  • Heat treatment method for heat-resistant cast magnesium alloy material
  • Heat treatment method for heat-resistant cast magnesium alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 A medium-sized complex thin-walled Mg-4.2Y-2Nd-2Gd-0.6Zr magnesium alloy casting

[0031] First, the casting is placed in a heating device, and pyrite is used to keep SO inside the device. 2 Atmosphere, heat up with the furnace; secondly, homogenize and solutionize the castings, 320±5℃, hold for 4 hours, heat up to 500℃, and perform the first stage of solution treatment, the process parameters are 500±5℃, hold for 8 hours hour, then raise the temperature to 540°C for the second stage of solid solution treatment, the process parameters are 540±5°C, keep warm for 1 hour; again, take out the casting and air-cool; after that, put the casting in the heating equipment and heat up with the furnace To 200 ℃ ± 3 ℃, keep warm for 4 hours, then raise the temperature to 225 ℃, keep warm for 12 hours; finally, take out the casting and place it in the room temperature organic polymer quenching agent liquid to complete the medium-sized complex thin-walled Mg-4.2Y-2Nd - Heat...

Embodiment 2

[0035] Embodiment 2 A large Mg-4.5Y-2.5Sm-3.5Gd-0.2Zn-0.6Zr magnesium alloy casting

[0036] Firstly, put the casting in the heating equipment, and after washing the furnace with Ar, keep the Ar atmosphere inside the equipment, and raise the temperature with the furnace; secondly, homogenize and solve the casting, keep it at 300±5°C for 6 hours, and heat it up to 500°C, carry out the first stage solution treatment, the process parameter is 500±5°C, keep warm for 3 hours, then raise the temperature to 525°C, carry out the second stage solution treatment, the process parameter is 525±5°C, keep hold for 8 hours; again , take out the casting, and air-cool; after that, put the casting in the heating equipment, raise the temperature to 180°C ± 3°C with the furnace, keep it warm for 2 hours, then raise the temperature to 245°C, keep it warm for 10 hours; finally, take out the casting and put it in 60 ℃ water, complete the heat treatment of large Mg-4.5Y-2.5Sm-3.5Gd-0.2Zn-0.6Zr magnes...

Embodiment 3

[0041] Embodiment 3Mg-10.5Gd-2.5Y-1.5Nd-0.1Zn-0.5Zr magnesium alloy casting

[0042] First, the casting is placed in a heating device, so that the interior of the device is always kept dry at a volume ratio of 100:1 CO 2 with SF 6 Mixed gas, heat up with the furnace; secondly, homogenize and solutionize the material, 315±5°C, keep warm for 0.5 hours, heat up to 490°C, and perform the first stage of solid solution treatment, the process parameters are 490±5°C, keep warm After 2 hours, the temperature was raised to 535°C for the second stage of solid solution treatment, the process parameters were 535±5°C, and the temperature was kept for 12 hours; again, the casting was taken out and quenched in an organic polymer quenching agent at room temperature; after that, the Put the casting in the heating equipment, raise the temperature to 255°C±3°C with the furnace, keep it for 2 hours, then cool it down to 225°C, and keep it for 10 hours; finally, take out the casting, put it in min...

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Abstract

The invention relates to a heat-resistant magnesium alloy heat treatment method, suitable processing objects being magnesium alloy materials, cast ingots and castings containing two or more than two rare earth elements. A preparation process includes homogenization, solid solution treatment and aging. The heat-resistant magnesium alloy heat treatment method can greatly improve the mechanical properties of the multi-component rare earth magnesium alloy with low rare earth content, can also solve processes and technical problems such as deformation, breaking, and structure uniformity during a heat treatment process of large magnesium alloy ingot blanks and medium and large complex thin-wall magnesium alloy castings, satisfies practical application of scientific research and industrial production of magnesium alloy materials, and has outstanding significance to improve the performance index of high-end magnesium alloy materials and castings in China and enrich the processing technology ofhigh-performance magnesium alloy materials, and especially in the field of special magnesium alloy heat treatment.

Description

technical field [0001] The invention relates to a heat treatment method for a heat-resistant cast magnesium alloy material. Background technique [0002] Magnesium alloy has low density, high specific strength, high specific stiffness, and has good antimagnetic, electronegativity, thermal conductivity, damping and shock absorption, and cutting performance. It has received more and more attention. It has been widely used in automobiles and 3C products be widely used. However, the shortcomings of insufficient strength and poor heat resistance have seriously hindered the development and application of magnesium alloy materials. Rare earth (RE) is the most effective alloying element to improve the heat resistance of magnesium alloys. The main reason is that in addition to degassing, impurity removal, improving casting fluidity, and corrosion resistance, most rare earth elements Magnesium has a large solid solubility limit, and as the temperature drops, the solid solubility dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22F1/02
CPCC22F1/002C22F1/02C22F1/06
Inventor 庞松徐永东任静刘辰任政朱秀荣王军王荣曹召勋杜喜旺
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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