Preparation method of ultrahigh strength titanium alloy hot-rolled bar

A high-strength titanium alloy and ultra-high technology, which is applied in the field of preparation of ultra-high-strength titanium alloy hot-rolled bars, can solve the problem of high deformation resistance of ultra-high-strength titanium alloy bars, affect the application of ultra-high-strength titanium alloy materials, and reduce ultra-high-strength titanium alloys. Mechanical properties and other issues, to achieve excellent organizational uniformity and performance uniformity, excellent tensile strength and elongation, and the effect of reducing impact

Active Publication Date: 2020-08-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultra-high-strength titanium alloy rods have high deformation resistance and are difficult to process. At the same time, during the rolling deformation process, the temperature rise is easy to cause overheating structure, and the formation of coarse β grains reduces the mechanical properties (strength, shape, etc.) of ultra-high-strength titanium alloys. Wait)
Moreover, it is difficult to obtain excellent comprehensive performance through heat treatment adjustment of this superheated structure, which greatly affects the application of ultra-high-strength titanium alloy materials. Isometric organization is a problem that those skilled in the art need to solve

Method used

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  • Preparation method of ultrahigh strength titanium alloy hot-rolled bar
  • Preparation method of ultrahigh strength titanium alloy hot-rolled bar
  • Preparation method of ultrahigh strength titanium alloy hot-rolled bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment includes the following steps:

[0024] Step 1. Heat the Ti-1300 ultra-high-strength titanium alloy rod with a diameter of Φ45mm to 810°C and keep it warm for 25 minutes;

[0025] Step 2. The Ti-1300 ultra-high-strength titanium alloy bar after heat preservation treatment in step 1 is heated up to 840 ° C for 5 minutes and then rolled for 10 passes. The rolled Ti-1300 ultra-high-strength titanium alloy bar Cool in air to room temperature, cut to length, and obtain a Ti-1300 ultra-high-strength titanium alloy hot-rolled bar with a diameter of Φ8mm; the deformation of a single-pass rolling in the rolling is 20%.

[0026] After testing, the Ti-1300 ultra-high-strength titanium alloy hot-rolled bar in this embodiment has a tensile strength of 1600 MPa after solution aging heat treatment, an elongation of 12%, a uniform equiaxed structure, and excellent comprehensive performance matching; The solution aging heat treatment process is as follows: heat the Ti-13...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] Step 1: Heat the Ti-5553 ultra-high-strength titanium alloy rod with a diameter of Φ50mm to 810°C and keep it warm for 28 minutes;

[0045] Step 2. The Ti-5553 ultra-high-strength titanium alloy bar after heat preservation treatment in step 1 is heated up to 840 °C in 6 minutes and then rolled for 8 passes, and the rolled Ti-5553 ultra-high-strength titanium alloy bar is Cool in air to room temperature, cut to length, and obtain a Ti-5553 ultra-high-strength titanium alloy hot-rolled rod with a diameter of Φ12 mm; the deformation of a single-pass rolling in the rolling is 15%.

[0046] After testing, the Ti-5553 ultra-high-strength titanium alloy hot-rolled bar in this embodiment has a tensile strength of 1530 MPa after solution aging heat treatment, an elongation of 11%, a uniform equiaxed structure, and excellent comprehensive performance matching; The solution aging heat treatment process is as follows: heat the...

Embodiment 3

[0054] This embodiment includes the following steps:

[0055] Step 1. Heat the Ti-1300 ultra-high-strength titanium alloy rod with a diameter of Φ55mm to 815°C and keep it warm for 30 minutes;

[0056] Step 2. The Ti-1300 ultra-high-strength titanium alloy bar after heat preservation treatment in step 1 is heated up to 840 ° C for 10 minutes and then rolled for 5 passes. The rolled Ti-1300 ultra-high-strength titanium alloy bar Cool in air to room temperature, cut to length, and obtain a Ti-1300 ultra-high-strength titanium alloy hot-rolled bar with a diameter of Φ20 mm; the deformation of a single-pass rolling in the rolling is 10%.

[0057] After testing, the Ti-1300 ultra-high-strength titanium alloy hot-rolled bar in this embodiment has a tensile strength of 1650 MPa after solution aging heat treatment, an elongation of 12%, a uniform equiaxed structure, and excellent comprehensive performance matching; The solution aging heat treatment process is as follows: heat the Ti-...

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Abstract

The invention discloses a preparation method of an ultrahigh strength titanium alloy hot-rolled bar. The preparation method comprises the following steps: S1, heating the ultrahigh strength titanium alloy hot-rolled bar to the temperature which is 15-20 DEG C lower than the beta phase transformation point temperature, and carrying out thermal insulation; and S2, heating the ultrahigh strength titanium alloy hot-rolled bar after thermal insulation treatment to the temperature which is 10 DEG C higher than the beta phase transformation point temperature, and carrying out multi-pass rolling to obtain the ultrahigh strength titanium alloy hot-rolled bar. According to the preparation method, a beta grain structure is obtained on the surface layer of the ultrahigh strength titanium alloy hot-rolled bar through two-step heating, so that impact of the ultrahigh strength titanium alloy hot-rolled bar to a roller is reduced during the rolling process, and abrasion of production equipment is lowered; the beta grain structure in the ultrahigh strength titanium alloy hot-rolled bar is fully crushed through multi-pass rolling to obtain the demanded equiaxed structure, and an overheated structureis not generated on the basis of lowering the rolling deformation resistance, so that the ultrahigh strength titanium alloy hot-rolled bar has excellent structure uniformity and performance uniformity to have excellent tensile strength and elongation.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and in particular relates to a method for preparing a super-high-strength titanium alloy hot-rolled rod. Background technique [0002] In recent years, with the development of aerospace vehicles, the research and application of titanium and titanium alloys continue to expand. Ultra-high strength titanium alloy (σ b ≥1250MPa) as structural parts used in aviation, aerospace and other parts that require high strength and high toughness, especially in the field of aerospace, to further improve the specific strength and specific stiffness of titanium alloys to achieve greater weight reduction effects. [0003] Ultra-high-strength titanium alloy rods used as fasteners are generally prepared by deformation below the β transformation point temperature. Ultra-high-strength titanium alloy rods have high deformation resistance and are difficult to process. At the same time, during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 周伟辛社伟张思远毛小南贾伟菊李倩李思兰毛成亮赵永庆
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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