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An Incrementally Constrained Multidirectional Forging Method for Silicon Carbide Whisker Reinforced Aluminum Matrix Composites

A silicon carbide whisker, multi-directional forging technology is applied in the field of warm forging to achieve the effects of reducing longitudinal cracking, avoiding cracking, and improving tensile strength and elongation at break

Active Publication Date: 2021-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an incrementally constrained multi-directional forging method for SiC whisker-reinforced aluminum-matrix composite materials, which can solve the problem of cracking in the forging process of SiC whisker-reinforced aluminum-matrix composite materials, and simultaneously improve the strength of the material and plasticity

Method used

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  • An Incrementally Constrained Multidirectional Forging Method for Silicon Carbide Whisker Reinforced Aluminum Matrix Composites
  • An Incrementally Constrained Multidirectional Forging Method for Silicon Carbide Whisker Reinforced Aluminum Matrix Composites
  • An Incrementally Constrained Multidirectional Forging Method for Silicon Carbide Whisker Reinforced Aluminum Matrix Composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Billet: Extruded cast silicon carbide crystal must enhance the aluminum alloy composite ingot (aluminum matrix 6061 aluminum alloy) and 12 mm thickness of 6061 aluminum alloy ring package to perform an interference fit, and welded at both ends 6061 aluminum alloy circular panel, has a coated blank having a diameter of 159 mm height of 154 mm;

[0065] (2) Put the coating blank into the box-type resistor furnace, heating to 455 ° C and heats up 90 min, the upper and lower anvil is heated to 440 ° C, the upper anvil pressure is 10mm / s; the heated cylindrical blank is placed in After the anvil, multi-directional forging is made by anvil and a radvation. figure 1 As shown, the upsetting is first upset along the cylindrical ingot, the pressure is 30%, and then the amount of upsetting each other is vertically vertically, the amount is 25%, respectively; the cylinder is returned to the body bomb. After continuing 3 cycles, the three-way is one cycle, such as figure 2 As sh...

Embodiment 2

[0069] (1) Billet: Extruded cast silicon carbide crystals need to enhance the aluminum alloy composite ingot (the same as in Example 1) and 10 mm thickness of the 6061 aluminum alloy package for overseeing cooperation, and weld 6061 aluminum at both ends. Alloy circular plates, an aluminum-based composite coated blank having a diameter of 155 mm height of 150 mm;

[0070] (2) Put the coating blank into the box resistance furnace, heated to 455 ° C and heat insulation 90 min, the upper oscillat of the press is hot to 440 ° C, the upper vollation pressure is 10 mm / s; the heated cylindrical blank is placed in After the anvil, multi-directional forging is made by anvil and a radvation. figure 1 As shown, the upsetting is first upset along the cylindrical ingot, and the amount of pressure is 35%, and then the amount of upsetting each other vertically, the amount of pressure is 30%; the cylinder is returned to the cube. Continue 2 multi-directional forging, such as figure 2 As shown...

Embodiment 3

[0076] (1) Bar: Extruded Cast Siliconated silicon crystals need to enhance the aluminum alloy composite ingot (same as in Example 1) and 6061 aluminum alloy package of 8 mm thickness, and weld 6061 aluminum at both ends. The alloy circular plate, an aluminum-based composite coated blank having a diameter of 151 mm height of 146 mm;

[0077] (2) Put the coating blank into the box resistance furnace, heated to 460 ° C and heat insulation 90 min, the upper oscillator on the press is hot to 450 ° C, the rate of the anvil pressure is 8mm / s; the heated cylindrical blank is placed in After the anvil, multi-directional forging is performed by an anvil, first in the first radial direction of the cylindrical ingot, the amount of pressure is 35%, and then along the second radial direction perpendicular to the first radial direction. Upset, the amount of pressure is 25%, and finally the axial direction is upset, the amount of pressure is 25%; the cylinder will return the cylindrical part to...

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Abstract

The invention provides an increment constraint multi-direction forging method of a silicon carbide whisker reinforced aluminum matrix composite, and belongs to the technical field of isothermal forging. The method comprises the following steps that a sheath is adopted for cladding a silicon carbide whisker reinforced aluminum matrix composite ingot casting, and a cladding blank is obtained; the cladding blank is subjected to near isothermality multi-direction forging, and the near isothermality multi-direction forging comprises squaring multi-direction forging and multi-direction forging aftersquaring in sequence; the initial pass reduction of each direction of squaring multi-direction forging is independently 25 to 40%; for forging of the same face, the subsequent pass reduction is progressively increased independently by 0 to 15% in sequence; the initial pass reduction of each direction of multi-direction forging after squaring is independently 25 to 35%; and for the same-face forging, the subsequent pass reduction is independently and progressively increased by 0 to 15% in sequence. Through the method, cracking of the free forging of the aluminum matrix composite can be avoided, and the tensile strength and the elongation at break of the composite can be improved.

Description

Technical field [0001] The present invention relates to the field of isothermal forging techniques, and more particularly to a silicon carbide crystal to enhance an incremental constraint multi-directional forging method of an aluminum matrix composite. Background technique [0002] The structure is lightweight is the long-term demand for the manufacturing industry, and the light metal and composite materials have a higher specific strength, which can greatly reduce the cross-sectional area and weight of the component in the same strength, thereby increasing efficiency, saving resources, reducing energy consumption and contamination. Because the aluminum alloy strength (especially thermal intensity) and elastic modulus are low, and the coefficient of thermal expansion is limited. The silicon carbide crystal must enhance the ratio of aluminum matrix composite material, the specific mold, wear resistance, anti-fatigue and thermal stability, have a large increase in aluminum alloy, ...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/02B21J5/06B21J5/08B21J1/06
CPCB21J1/02B21J1/06B21J5/002B21J5/06B21J5/08
Inventor 徐文臣单德彬靳学泽徐佳炜郭斌曾祥乾熊文登
Owner HARBIN INST OF TECH
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