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Aluminum alloy with high heat stability and fatigue resistance and heat treatment technology

A thermal stability and anti-fatigue technology, which is applied in the field of aluminum alloy and heat treatment process, can solve problems such as low elongation, inability to realize thermal stability and fatigue performance of structure performance, and inability to reach high temperature conditions of 200°C, and achieve thermal stability Improvement of resistance and fatigue performance, satisfying high strength and thermal stability, and excellent strengthening effect

Active Publication Date: 2015-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy strength obtained by this patented technology is a medium strength of about 470MPa, which cannot meet the high strength performance (≥500MPa) required by aluminum alloy oil drill pipes.
The thermal stability of the microstructure and properties of this alloy can only be realized below 135°C, and cannot reach the high temperature condition of 200°C
Wang Heng (Powder Metallurgy Materials Science and Engineering, 2012, Vol.17, No.5, p639-644) made the strength of 2D12 aluminum alloy reach 503MPa through pre-deformation and peak aging, but the tensile elongation of the alloy was reduced to 6.4%
Wang Jianhua (Thermal Processing Technology, No. 2, 2001, p13) made the strength of 2618 aluminum alloy reach 468MPa through pre-deformation and peak aging, but the tensile elongation of the alloy was reduced to 4.4%
Such a low elongation rate seriously reduces the fatigue performance of the alloy, and it is impossible to improve the thermal stability and fatigue performance of the microstructure and performance under the condition of strength higher than 500MPa, so as to meet the requirements of aluminum alloy oil drill pipe materials

Method used

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  • Aluminum alloy with high heat stability and fatigue resistance and heat treatment technology
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  • Aluminum alloy with high heat stability and fatigue resistance and heat treatment technology

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Experimental program
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Effect test

Embodiment 1（T8

[0045] The alloy composition is: 4.10%Cu, 1.27%Mg, 0.47%Mn, 0.10%Ti, 0.2%Ni, 0.5%Fe, 0.5%Si, and the balance is Al at 490°C for 12 hours for homogenization After chemical treatment, the ingot was extruded into a material at 410°C with an extrusion ratio of 27, then solidified at 505°C for 1 hour and quenched in water, with a pre-stretch deformation of 4%, and aged at 185°C for 2 hours. The tensile mechanical properties at room temperature reach: the tensile strength is 555MPa, the yield strength is 472MPa, and the elongation is 14%. The elongation rate is 10%. Under the alternating load of 280MPa stress level and stress ratio of 0.1, the number of fatigue cycles reaches 1.25×10 7 .

Embodiment 2（T8

[0047] The alloy composition is: 3.80%Cu, 1.80%Mg, 0.90%Mn, 0.15%Ti, 0.10%Ni, 0.70%Fe, 0.70%Si, and the balance is Al at 460°C for 36 hours for uniform After chemical treatment, the ingot was extruded into a material at 380°C with an extrusion ratio of 20, then solidified at 510°C for 0.5 hour and water quenched, 4% pre-stretch deformation was applied, and then aged at 150°C for 12 hours The final mechanical properties reach: the tensile strength is 541MPa, the yield strength is 437MPa, and the elongation is 16%. The rate is 13%. Under the alternating load of 350MPa stress level and stress ratio of 0.1, the fatigue cycle reaches 5.0×10 5 .

Embodiment 3（T8

[0049] The alloy composition is: 4.90%Cu, 1.20%Mg, 0.30%Mn, 0.05%Ti, 0.35%Ni, 0.30%Fe, 0.30%Si, the balance is Al alloy ingot at 475℃ for 24 hours for uniform After chemical treatment, the ingot was extruded into a material at 360°C with an extrusion ratio of 27, then solidified at 515°C for 50 minutes and water quenched, 8% pre-stretch deformation was applied, and then aged at 120°C for 20 hours The final mechanical properties reach: the tensile strength is 542MPa, the yield strength is 463MPa, and the elongation is 15%. The rate is 9%. Under the alternating load of 280MPa stress level and stress ratio of 0.1, the number of fatigue cycles reaches 1.0×10 7 .

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Abstract

The invention discloses an aluminum alloy with high heat stability and fatigue resistance and a heat treatment technology. Due to microalloying and implementation of a large-deformation extrusion technology at a lower temperature, a second phase of a microalloy is broken and refined, the heat stability of a structure property of the alloy is improved, and the fatigue property of the alloy is not reduced. Simultaneously, an alloy ageing course at an early stage of S' phase precipitation is controlled; since an S' phase has an excellent reinforcing effect and sufficient tenacity and deformability, the requirements of the alloy on the high strength and the heat stability are met; and simultaneously, the alloy has the excellent fatigue resistance. In addition, dislocation can be introduced as an energy trap during pretensioning deformation application before ageing, so that the second phase is dispersed and precipitated, and a precipitated phase located in the dislocation trap has the high heat stability. Therefore, the heat stability and the fatigue property of the structure property of the alloy under a strength condition of above 500 MPa are improved, and the requirements of a heat resisting aluminum alloy petroleum drilling rod material on properties are met.

Description

technical field [0001] The invention relates to an aluminum alloy and a heat treatment process, in particular to an aluminum alloy with high thermal stability and fatigue resistance and a heat treatment process; the aluminum alloy with high thermal stability and fatigue resistance can be obtained simultaneously through microalloying Alloy and heat treatment process; it belongs to the technical field of non-ferrous metal materials. Background technique [0002] Aluminum alloy has a series of advantages as a material for oil drill pipes, such as: low density, greatly reducing the load on the drilling rig, and aluminum alloy as a drill pipe material has natural anti-H 2 S and CO 2 Intrinsic properties of corrosion, etc. These advantages can make aluminum alloy drill pipe materials more suitable for drilling operations in deep and ultra-deep wells. It is precisely because of the temperature environment of up to 200 °C in deep and ultra-deep wells that the aluminum alloy drill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22F1/057
Inventor 刘志义林茂陈来王恒夏鹏
Owner CENT SOUTH UNIV
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