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Process for improving strength of friction stir welding (FSM) joint for discontinuously reinforced aluminum (DRA) matrix composites

A composite material, enhanced aluminum-based technology, used in welding equipment, manufacturing tools, non-electric welding equipment and other directions, can solve the problems of joint strength recovery, deformation of welding parts, etc., to improve mechanical properties, reduce tool wear, improve welding The effect of seam strength

Active Publication Date: 2011-06-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature solution treatment of DRA after welding will further promote the formation of intermetallic compounds in the wear debris in the weld nugget area, so that the strength of the joint after heat treatment cannot recover to the level of the base metal
In addition, solution quenching can lead to deformation of the weldment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use a 6mm thick 15vol.% SiCp / 2009Al composite material to roll the plate. After solution treatment at 516°C for 1 hour and quenching, friction stir welding is carried out within 1 hour under the welding parameters of tool speed 400 rpm and welding speed 100 mm / min. , the weld surface is smooth. Microstructural examination showed that the interior was dense and free of defects, and the welding tools were slightly worn. The welded joint was placed at room temperature for more than 4 days to measure the tensile strength. The transverse tensile strength of the joint was 465MPa, the yield strength was 308MPa, the elongation was 6.1%, and the strength reached 86% of the base metal. T4 treatment (solution treatment at 516°C for 1 hour, water quenching, and room temperature for 4 days) was performed on the welded workpiece, and the fine-grained structure in the weld zone did not significantly coarsen. The transverse tensile strength of the composite material joint is 535MPa, t...

Embodiment 2

[0028] Use a 6mm thick 15vol.%SiCp / 2024Al composite material to roll the plate, and after solution treatment at 500°C for 1 hour and quenching, friction stir welding is carried out within 1 hour under the welding parameters of tool speed 1600 rpm and welding speed 100 mm / min , the weld surface is rough. Microstructural examination showed that the interior was dense and free of defects, and the welding tools were slightly worn. The tensile strength of the welded joint was measured at room temperature for more than 4 days. The transverse tensile strength of the joint was 410MPa, the yield strength was 270MPa, the elongation was 5.2%, and the strength reached 76% of the base metal. T4 treatment (solution treatment at 516°C for 1 hour, water quenching, and room temperature for 4 days) was performed on the welded workpiece, and the fine-grained structure in the weld zone did not significantly coarsen. The transverse tensile strength of the composite joint is 514MPa, the yield stre...

Embodiment 3

[0032] Use a 3mm thick 20vol.%TiCp / 2124Al composite material to roll the plate. After solution treatment at 510°C for 1 hour and quenching, friction stir welding is carried out within 2 hours under the welding parameters of tool speed 600 rpm and welding speed 100 mm / min. , the weld surface is smooth. Microstructural examination showed that the interior was dense and free of defects, and the welding tools were slightly worn. The tensile strength of the welded joint was measured at room temperature for more than 4 days. The transverse tensile strength of the joint was 530MPa, the yield strength was 395MPa, the elongation was 3.5%, and the strength reached 93% of the base metal. T4 treatment (solution treatment at 516°C for 1 hour, water quenching, and room temperature for 4 days) was performed on the welded workpiece, and the fine-grained structure in the weld zone did not significantly coarsen. The transverse tensile strength of the composite material joint is 570MPa, the yie...

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Abstract

The invention relates to aluminum matrix composites and the field of welding, specially provides a process for improving the strength of a friction stir welding (FSM) joint for discontinuously reinforced aluminum (DRA) matrix composites, which is suitable for DRA matrix composites capable of being subjected to reinforced heat treatment. The process comprises the following steps: carrying out solution treatment on aluminum matrix composites which can be subjected to reinforced heat treatment; after the quenching operation is performed, carrying out friction stir welding on the obtained object within four hours; and carrying out natural ageing or artificial aging on the obtained weld assembly in the air according to the application demands, or carrying out reinforced heat treatment again onthe weld assembly by using a commonly-used industrial process. By using the welding process provided by the invention, the weldability of DRA matrix composites can be improved obviously, the tool wear can be reduced, and the mechanical property of a composite joint can be improved.

Description

Technical field: [0001] The invention relates to the field of aluminum-based composite materials and welding, and in particular provides a process for improving the joint strength of discontinuously reinforced aluminum-based composite materials by stirring friction welding. The process is suitable for discontinuously reinforced aluminum-based composite materials that can be strengthened by heat treatment. Background technique: [0002] Metal Matrix Composite (MMC) not only has the characteristics of light weight and high strength, but also has a series of advantages such as good fatigue resistance, high temperature creep resistance, heat resistance, wear resistance, vibration reduction and dimensional stability, and has become a national economic development and national defense. An important structural material in the security field. Discontinuously reinforced aluminum matrix composites (DRA) are suitable for industrial mass production due to their light weight matrix, simp...

Claims

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Application Information

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IPC IPC(8): B23K20/12C22F1/04
Inventor 肖伯律王东王全兆马宗义
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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