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A forging preparation process of discontinuously reinforced aluminum matrix composites

A composite material and reinforced aluminum-based technology, applied in the direction of metal processing equipment, etc., can solve the problems of no control method for free forgings and huge differences in deformation uniformity, so as to achieve easy control of deformation structure, improvement of micro-uniformity, and increase The effect of forging efficiency

Active Publication Date: 2019-11-08
中科复材(滨州)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, free forging is a non-isothermal and constant strain rate condition, and for large-size forgings, the deformation uniformity varies greatly, and the existing data do not give a method for controlling the structure of free forgings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The 20vol.% SiCp / 2009Al billet was prepared by powder metallurgy method, and the rod was prepared by hot extrusion method, the size was φ150×3000mm, the extrusion temperature was 320°C, and the extrusion speed was 0.2mm / s. Cut the bar into φ150×300mm. Incubate at 480°C for 3 hours. Free forging with 500 tons of hydraulic press, upsetting along the height direction of 300mm, deformation speed of 30mm / s, deformation amount of each pass 35%, final forging temperature of 430°C. Forging for 3 passes, holding the temperature at 480°C for 3 hours between each pass. The forging size of the workpiece is 150×150×230mm. There is no crack on the surface of the forged workpiece.

Embodiment 2

[0030] A 30vol.% SiCp / 2009Al ingot was prepared by powder metallurgy, and a rod was prepared by hot extrusion, with a size of φ350×1500mm, an extrusion temperature of 350°C, and an extrusion speed of 0.2mm / s. Cut the bar into φ350×350mm. Incubate at 480°C for 6 hours. Free forging with 800 tons hydraulic press. Upsetting along the height direction of 350mm, the deformation amount per pass is 20%, the deformation speed is 25mm / s, and the final forging temperature is 430°C. Forging 4 times, between each pass at 480 ° C for 6 hours. The forging size of the workpiece is φ550×150mm. There are no cracks on the edge of the forged workpiece.

Embodiment 3

[0034]The 25vol.% SiCp / 2009Al ingot was prepared by stirring casting method, and the rectangular material was prepared by hot extrusion method, the size was 150×200×3000mm, the extrusion temperature was 380°, and the extrusion speed was 0.2mm / s. Cut the rectangular bar into 150×200×300mm. Incubate at 460°C for 4 hours. Free forging with 800 tons hydraulic press. Forging along the height direction of 150mm, drawing along the width direction of 200mm, the deformation speed is 30mm / s, the deformation amount per pass is 30%, and the final forging temperature is 420°C. Forging 2 passes, between each pass at 460 ° C for 4 hours. The forging size of the workpiece is 70×350×350mm. There is no crack on the surface of the forged workpiece.

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Abstract

A preparation process for a forge piece of a discontinuous reinforcement aluminum-based composite is characterized in that through a hot extrusion method, a rodlike or rectangular forging stock is prepared from a composite billet prepared through a powder metallurgy or stir casting method; during extrusion, the extrusion temperature and speed are controlled, and thus the microstructure of an extrusion material (forging stock) is controlled; and the structure and performance of the forge piece are controlled by controlling the temperature, the deformation rate and the final forging temperature of free forging. Through the preparation process, single-pass forging and pressing deformation can be improved, forging cracks are reduced, thus the forging efficiency and yield are improved substantially, and products of different shapes can be obtained through forging. Compared with an isothermal die forging commonly used for difficult-to-form metal, the preparation process for the forge piece of the discontinuous reinforcement aluminum-based composite is lower in cost and wide in application range.

Description

technical field [0001] The invention relates to the field of aluminum-based composite materials, and provides a process method for preparing forgings of discontinuously reinforced aluminum-based composite materials. Background technique [0002] Discontinuously reinforced aluminum matrix composites (abbreviated as DRA) have a series of advantages such as light weight, high strength, fatigue resistance, high temperature creep resistance, heat resistance, wear resistance, vibration reduction and dimensional stability, and the manufacturing process is simple. The price is low, so it has become an important structural material in the field of national economic development and national defense security. Developed countries have successfully used DRA in aircraft, automobiles, rail transit and other fields, and achieved mass production of parts and components, achieving significant economic and social benefits (International Materials Reviews, vol.39, No.1(1994)p .1-23). [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00C22F1/04
CPCB21J5/002C22F1/04
Inventor 王东马宗义肖伯律王全兆倪丁瑞张星星刘振宇薛鹏
Owner 中科复材(滨州)新材料有限公司
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