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High-specific-strength and high-specific-stiffness aluminum-lithium alloy thick-wall annular piece and preparation method thereof

An aluminum-lithium alloy with high specific strength technology, which is applied in metal processing equipment, manufacturing tools, casting molding equipment, etc., can solve the problems of specific strength, insufficient specific stiffness, low density, and cannot meet the requirements of weight reduction, etc., and achieve good strength , low density, energy saving effect

Active Publication Date: 2022-02-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the ordinary aluminum alloy ring parts traditionally used in centrifugal casting have low density (density greater than 2.7 g / cm 3 ), and the specific strength and specific stiffness are not enough to meet the growing demand for weight reduction, providing a high specific strength, specific stiffness aluminum-lithium alloy thick-walled ring and its preparation method

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  • High-specific-strength and high-specific-stiffness aluminum-lithium alloy thick-wall annular piece and preparation method thereof
  • High-specific-strength and high-specific-stiffness aluminum-lithium alloy thick-wall annular piece and preparation method thereof

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preparation example Construction

[0055] In a second aspect, the present invention provides a method for preparing the aluminum-lithium alloy thick-walled annular member described in the first aspect, comprising:

[0056] S1. Prepare raw materials according to requirements, and optionally preheat the raw materials;

[0057] S2. Smelting and refining the raw materials obtained in S1;

[0058] S3. Centrifugally casting and cooling the material obtained in S2 to obtain a ring casting;

[0059] S4, performing heat treatment on the annular casting obtained in S3, the heat treatment process includes: first performing solution treatment under an inert atmosphere, then performing quenching treatment, then performing aging treatment under an inert atmosphere, and then performing optional cooling;

[0060] Wherein, boron nitride coatings are respectively provided on the surfaces of all devices that are in contact with molten metal after raw materials are melted.

[0061] All the devices that come into contact with the...

Embodiment 1

[0089] A thick-walled aluminum-lithium alloy ring with high specific strength and specific stiffness, its chemical composition is: Cu1.4wt%, Li 3.0wt%, Mg 1.2wt%, Zn 0.6wt%, Er 0.1wt%, Zr 0.1wt%, Fe≤0.08wt%, Si≤0.05wt%, the balance is Al and unavoidable impurities.

[0090] Its microstructure is fine equiaxed dendrite, the grain size is 70μm, the internal structure of the alloy is dense, and the dendrite segregation is significantly weakened. The size of the aluminum-lithium alloy thick-walled ring is: the height is 400mm, the outer diameter is 380mm, the wall thickness is 80mm, and the mold size is as follows figure 1 shown. The performance of the high specific strength aluminum alloy ring is: the density is 2.47g / cm 3 , the tensile strength is 450MPa, the elongation is 6.3%, the elastic modulus is 81GPa, and the specific strength is 182MPa / (g / cm 3 ), the specific stiffness is 32.8GPa / (g / cm 3 ).

[0091] The integrated preparation method of the aluminum-lithium alloy thi...

Embodiment 2

[0110] A high specific strength, specific stiffness aluminum-lithium alloy thick-walled ring, the chemical composition of the high specific strength aluminum alloy is: Cu 2.5wt%, Li 3.5wt%, Mg 1.3wt%, Zn 0.7wt% , Er 0.2wt%, Zr 0.2wt%, Fe≤0.08wt%, Si≤0.05wt%, and the total amount of alloying elements does not exceed 8.5wt%, and the balance is Al and unavoidable impurities.

[0111] Its microstructure is fine equiaxed dendrite, the grain size is 40μm, the internal structure of the alloy is dense, and the dendrite segregation is significantly weakened. Its dimensions are: the height is 400mm, the outer diameter is 400mm, the wall thickness is 100mm, and the mold size is as follows figure 2 shown. The performance of the aluminum-lithium alloy thick-walled ring is: the density is 2.53g / cm 3 , the tensile strength is 550MPa, the elongation is 6.1%, the elastic modulus is 85GPa, and the specific strength is 217MPa / (g / cm 3 ), specific stiffness 33.6GPa / (g / cm 3 ).

[0112] The pr...

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Abstract

The invention provides a high-specific-strength and high-specific-stiffness aluminum-lithium alloy thick-wall annular piece and a preparation method thereof, and belongs to the technical field of aluminum-lithium alloy new materials and manufacturing. The aluminum-lithium alloy thick-wall annular piece comprises the following chemical components: 0.8-2.8 wt% of Cu, 2.4-3.8 wt% of Li, 0.8-1.8 wt% of Mg, 0.5-1.5 wt% of Zn, 0.1-0.5 wt% of Er, 0.05-0.2 wt% of Zr, less than or equal to 0.08 wt% of Fe, less than or equal to 0.05 wt% of Si, and the balance of Al and inevitable impurities, wherein the total amount of the alloy elements is less than or equal to 8.5 wt%. The preparation method comprises the steps of alloy proportioning, boron nitride brushing, smelting, refining, centrifugal casting and heat treatment. According to the invention, the forming process of the aluminum alloy annular piece can be simplified, the internal structure is compact, and the specific strength and specific stiffness of the aluminum alloy annular part are remarkably improved.

Description

technical field [0001] The invention relates to the field of new aluminum-lithium alloy materials and manufacturing technology, in particular to an aluminum-lithium alloy thick-walled annular part with high specific strength and specific stiffness and a preparation method thereof. Background technique [0002] Metal ring materials can be used as key connection, transmission, slewing and supporting components in the fields of major mechanical equipment, pressure vessels, and aerospace equipment manufacturing. Since aluminum-lithium alloy has a wide service temperature range, good casting performance and mechanical properties, and the density of the current lightweight aluminum-lithium alloy is only 1 / 3 of that of traditional steel materials, it is in the face of the global energy crisis and environmental degradation. In the background, exploring the use of aluminum-lithium alloy annular structural parts to replace traditional steel materials has broad industrial application p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/18C22C1/03C22C1/06C22F1/04C22F1/057C22F1/02B22D13/04B22C3/00B22D13/10
CPCC22C21/00C22C21/18C22C21/16C22C21/14C22C1/026C22C1/03C22C1/06C22F1/04C22F1/057C22F1/002C22F1/02B22D13/04B22C3/00B22D13/10
Inventor 王俊升杨兴海田光元薛程鹏王硕张宇轩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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