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Laser heat-treatment strengthening process of aluminum alloy

A laser heat treatment, aluminum alloy technology, applied in the field of laser applications, can solve the problems of long processing time, uneven heating, increased processing cost, etc., and achieve the effect of simple operation and good processing quality

Active Publication Date: 2017-01-25
湖北雅傢达门窗有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this approach has limitations
Non-uniform heating due to temperature gradients
Zheng Ziqiao et al. used the method of low temperature and long regression time to return, but this method takes a long time to process and the processing cost is greatly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For the cast 20 mm 7075 aluminum alloy sample, no laser treatment is used, only solid solution and double aging are performed, and the surface hardness HBW=149.

Embodiment 2

[0043] For the cast 20 mm 7075 aluminum alloy sample, the regressed part was heated by furnace temperature, and the regressed part: 160 °C × 2h, the precipitated phase increased, and the surface hardness HBW=173.

Embodiment 3

[0045] For the cast 20 mm 7075 aluminum alloy sample, the laser power is 850 watts, the laser beam scanning speed is 2 mm / s, and the defocus is 45 mm. The laser makes the workpiece surface reach the return temperature in the RRA process, and the heat treatment time is 10 seconds, reaching The effect of the precipitated phase is significantly increased.

[0046] The hardness test was carried out on the treated sample, and the surface hardness HBW=181. Compared with the sample without laser treatment, the hardness increased by 20%. Compared with the sample heated at furnace temperature, the hardness increased by 4.6%.

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Abstract

The invention relates to a laser heat-treatment strengthening process of an aluminum alloy. The process comprises the following steps of firstly adopting solid solutioning: 450 DEG C*1h + 470 DGC C*2h, wherein the ageing is 120 DEG C*16h; then utilizing laser to heat a metal surface to the regression temperature, wherein the adopted laser power is 550 to 900W, the laser beam scanning speed is 1 to 5mm / s, and the defocusing amount is 45mm; after cooling the metal, aging for 120 DEG C*16h. A precipitated phase eta' is obviously increased, and metal is greatly strengthened. According to the process, a workpiece surface is instantly heated through a laser beam, and a material is own cooled, so that a material laser irradiation surface layer precipitated phase is dissolved into a solid solution body, a continuous chain precipitated phase on a crystal boundary is combined and gathered so as not to be continuous, and the strength is increased.

Description

technical field [0001] The invention belongs to the field of laser applications, and specifically relates to a laser heat treatment strengthening process for aluminum alloys. Background technique [0002] In 1974, Cina et al. first proposed regression reaging. The regression reaging heat treatment includes the following stages: firstly, the alloy that has undergone solution treatment is subjected to peak aging treatment, and then regression treatment is performed at a certain high temperature, and then aging treatment at T6 is performed. . The best regression time is shortened with the increase of regression temperature. Therefore, for the choice of regression time, the regression time adopted by Cina is 1-30s and traditional heat treatment is not suitable for such short-term heating. Cina et al. tried to use the method of induction rapid heating. But this approach has limitations. Due to the existence of temperature gradient, the heating is not uniform. Zheng Ziqiao et ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/053
Inventor 苏睿明刘桐曲迎东尤俊华吴一弘
Owner 湖北雅傢达门窗有限公司
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