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Modification method for improving high-temperature creep resistance of aluminum alloy

A high temperature resistant, aluminum alloy technology, applied in metal processing equipment, welding media, non-electric welding equipment, etc., can solve problems such as improper addition of nanoparticles, cracks in aluminum alloy materials, etc., to achieve high atomic bonding and improved creep performance , good wettability effect

Active Publication Date: 2020-05-12
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of the improper addition of nanoparticles in the prior art and the creep cracking of aluminum alloy materials under high temperature service, a modification method for improving the high temperature creep resistance of aluminum alloys is provided

Method used

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  • Modification method for improving high-temperature creep resistance of aluminum alloy
  • Modification method for improving high-temperature creep resistance of aluminum alloy
  • Modification method for improving high-temperature creep resistance of aluminum alloy

Examples

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Effect test

Embodiment 1

[0021] A modification method for improving the high-temperature creep resistance of aluminum alloys, comprising the steps of:

[0022] (1) The 7075 aluminum alloy sheet to be modified is rolled and milled, and then slotted in the area that needs to be welded. The groove meets the strength requirements of the aluminum alloy sheet and accommodates the nano-powder core wire, and then adopts 8mm static Shaft shoulder stirring head, carry out friction stir treatment under the parameters of F=1500rpm, S=300mm / min, and the downward force of 8.8mm; the nano-powder core wire material is a shell-core structure, and the shell-core structure The shell is a 7075 aluminum alloy extruded profile, and the core includes the following nano-powder core in the weight percentage: ZrB 2 20%, 7075 aluminum alloy 50%, TiC 30%;

[0023] The operation diagram of step (1) is as follows figure 1 As shown, 1-stirring head, 2-aluminum alloy plate, 3-slot, 4-nanometer powder core wire;

[0024] (2) Unde...

Embodiment 2

[0026] A modification method for improving the high-temperature creep resistance of aluminum alloys, comprising the steps of:

[0027] (1) The 7075 aluminum alloy sheet to be modified is rolled and milled, and then slotted in the area that needs to be welded. The groove meets the strength requirements of the aluminum alloy sheet and accommodates the nano-powder core wire, and then adopts 8mm static Shaft shoulder stirring head, under the parameters of F=1200rpm, S=500mm / min, and the pressure amount of 10mm, carry out friction stir treatment; the nano-powder core wire material is a shell-core structure, and the shell of the shell-core structure The layer is a 7075 aluminum alloy extruded profile, and the core includes the following nano-powder core in the weight percentage: ZrB 2 20%, 7075 aluminum alloy 50%, TiC 30%;

[0028] (2) Under the conditions of pulse energy 15J, spot diameter 1.5mm, and overlap rate 65%, laser shock strengthening treatment was performed. After 2 sho...

Embodiment 3

[0030] A modification method for improving the high-temperature creep resistance of aluminum alloys, comprising the steps of:

[0031] (1) The 7075 aluminum alloy sheet to be modified is rolled and milled, and then slotted in the area that needs to be welded. The groove meets the strength requirements of the aluminum alloy sheet and accommodates the nano-powder core wire, and then adopts 8mm static Shaft shoulder stirring head, under the parameters of F=1800rpm, S=200mm / min, and the pressure of 7mm, the friction stir treatment is carried out; the nano-powder core wire material is a shell-core structure, and the shell of the shell-core structure The layer is a 7075 aluminum alloy extruded profile, and the core includes the following nano-powder core in the weight percentage: ZrB 2 20%, 7075 aluminum alloy 50%, TiC 30%;

[0032] (2) Under the conditions of pulse energy 14J, spot diameter 3mm, and overlap ratio 68%, laser shock strengthening treatment was performed. After 3 sho...

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Abstract

The invention relates to a modification method for improving the high-temperature creep resistance of aluminum alloy. A groove is formed in a to-be-welded zone of an aluminum alloy plate, a nano powder cored wire is added into the groove, the nano powder cored wire has a shell-core structure, a shell layer is a 7075 aluminum alloy extrusion profile, a core comprises a nano powder core composed of,by weight percent, 20% of ZrB2, 50% of 7075 aluminum alloy and 30% of TiC, friction stirring treatment is conducted, then, nano particles can be effectively added into the to-be-welded zone of aluminum alloy, and the high-temperature creep resistance of the material can be improved; and after friction stirring treatment, the creep resistance of the friction stirring to-be-welded zone of the aluminum alloy can be further improved through a laser shock processing method. The method can effectively improve the high-temperature creep resistance of the to-be-welded zone of the aluminum alloy and moreover is a simple, effective and environment-friendly technology, can be suitable for different sizes of occasions, and has very high use value.

Description

technical field [0001] The invention relates to the technical field of metal modification, in particular to a modification method for improving the high-temperature creep resistance of aluminum alloys. Background technique [0002] 7075 aluminum alloy is a super strong aviation material. Its tensile strength is almost equal to that of steel, but its density is only 1 / 3 of that of steel. It is not only widely used in aircraft manufacturing, but also in other equipment, especially transportation equipment. be widely used. For its thermal welding, due to the inhomogeneity of the molecular flow velocity of aluminum, zinc, magnesium, copper and other alloying elements, it will cause creep cracking in the area to be welded or cracks in the 7075 aluminum alloy sheet in a large number of applications in the field of high temperature service. , so the improvement of the high temperature creep resistance of 7075 aluminum alloy is an urgent problem to be solved. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K35/02B23P15/00C21D10/00C22F1/04
CPCB23K20/122B23K35/0261B23P15/00C21D10/005C22F1/04
Inventor 王江涛谢利周东帅申明倩卢雅琳孙凌燕李小平
Owner JIANGSU UNIV OF TECH
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