Method for improving thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloy for aluminum alloy drill rod

An al-cu-mg-yb, aluminum alloy technology, which is applied in the field of heat treatment of aluminum alloys, can solve problems such as the inability to meet the requirements of ultra-deep wells, and achieve excellent room temperature tensile properties, high residual strength, and high fatigue strength. Effect

Inactive Publication Date: 2014-11-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the existing Al-Cu-Mg series alloys are aluminum alloys produced by ingot metallurgy, which can only be used in an environment below 150°C, and cannot reach Requirements for use in an environment of 200 °C required by ultra-deep wells

Method used

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  • Method for improving thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloy for aluminum alloy drill rod
  • Method for improving thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloy for aluminum alloy drill rod
  • Method for improving thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloy for aluminum alloy drill rod

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Embodiment 1

[0037] This embodiment provides a method for improving the thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 10 And Table 1, the method includes: after the Al-Cu-Mg-Yb alloy that has undergone solid solution is pre-stretched and deformed by 0 to 8%, it is heated to 150°C to 190°C, kept for 2 hours to 12 hours, and then air-cooled. The content ratio of copper and magnesium in the Al-Cu-Mg-Yb alloy is 2-4. The main components and weight percentages of the Al-Cu-Mg-Yb alloy are: Cu: 3.8%-4.8%, Mg: 1.2%-1.8%, Mn: 0.3%-0.9%, Ti: 0.05%-0.20%, Yb: 0.05% to 0.25%, the balance is Al. The solid solution temperature of the Al-Cu-Mg-Yb alloy is 505°C to 515°C, the solid solution time of the Al-Cu-Mg-Yb alloy is 0.5 hour to 1 hour, and the solid solution of the Al-Cu-Mg-Yb alloy is After melting, use water quenching to cool down. The Al-Cu-Mg-Yb alloy is made by adding 0.05% to 0.25% of Yb during th...

Embodiment 2

[0039] This embodiment provides a method for improving the thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 10 And Table 1, the method includes: after the Al-Cu-Mg-Yb alloy that has undergone solid solution is pre-stretched and deformed by 0 to 8%, it is heated to 150°C to 190°C, kept for 2 hours to 12 hours, and then air-cooled. The content ratio of copper and magnesium in the Al-Cu-Mg-Yb alloy is 2-4. The main components and weight percentages of the Al-Cu-Mg-Yb alloy are: Cu: 4.1%-4.3%, Mg: 1.2%-1.5%, Mn: 0.47%-0.75%, Ti: 0.10%-0.15%, Yb: 0.15% to 0.20%, the balance is Al. The solid solution temperature of the Al-Cu-Mg-Yb alloy is 505°C to 515°C, the solid solution time of the Al-Cu-Mg-Yb alloy is 0.5 hour to 1 hour, and the solid solution of the Al-Cu-Mg-Yb alloy is After melting, use water quenching to cool down. The Al-Cu-Mg-Yb alloy is made by adding 0.05% to 0.25% of Yb during ...

Embodiment 3

[0041] The embodiment of the present invention provides a method for improving the thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 10 And Table 1, the composition and composition of the Al-Cu-Mg-Yb alloy are: 4.10% Cu, 1.27% Mg, 0.47% Mn, 0.20% Ti, 0.05% Yb, and the balance is Al. The aluminum alloy plate of this composition is solid-dissolved at 505°C for 1 hour and quenched in water, the pre-stretch deformation is 0%, and the tensile mechanical properties at room temperature after aging at 190°C for 8 hours reach: the tensile strength is 531Mpa, the yield strength The tensile strength at room temperature after 500 hours of heat exposure at 200°C reaches: the tensile strength is 374Mpa, the yield strength is 296Mpa, and the elongation is 13%. Under the alternating load of 220MPa stress level and stress ratio of 0.1, the number of fatigue cycles reaches 5.7×10 6 .

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Abstract

The invention discloses a method for improving thermal stability and fatigue resistance of an Al-Cu-Mg-Yb alloy for an aluminum alloy drill rod. The method comprises the following steps: after the prestretching deformation is performed for the Al-Cu-Mg-Yb alloy passing through solid solution by 0-8%, the Al-Cu-Mg-Yb alloy is heated to 150-190 DEG C; after the temperature of 150-190 DEG C is kept for 2-12 hours, the Al-Cu-Mg-Yb alloy is discharged from a furnace and cooled in air; and the copper-magnesium content ratio in the Al-Cu-Mg-Yb alloy is 2-4. The transgranular structure of the Al-Cu-Mg-Yb alloy mainly consists of a small dispersion precipitated phase S' through a prestretching deformation ageing heat treatment process, so that the tensile strength, thermal stability and fatigue resistance of the alloy are improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of aluminum alloys, in particular to a method for improving the thermal stability and fatigue resistance of Al-Cu-Mg-Yb alloys for aluminum alloy drill pipes. 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 wells 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 structure and mechanical properties of aluminum alloy drill pipe materials are required to have high thermal stability and excellent fatigue resistance. [0003] Al-Cu-Mg series alloys are the most heat-re...

Claims

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Application Information

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IPC IPC(8): C22C21/16C22F1/057
Inventor 冯春杨成新宋生印卢强刘志义申昭熙刘永刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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