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Forging-rolling composite processing and heat treatment process of a near-α-type high-temperature titanium alloy

A high-temperature titanium alloy and composite processing technology, which is applied in the field of titanium alloy preparation, can solve problems such as narrow temperature windows, and achieve the effects of reducing waste, saving costs, and excellent mechanical properties

Active Publication Date: 2022-03-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention can increase the allowable forging temperature to the β-phase region, solve the problem that the temperature window is too narrow in the forging stage, and can also reuse the existing materials whose forging structure becomes Widmanstatten structure due to the high forging temperature, and at the same time Compared with the traditional forging process, the structure uniformity is improved

Method used

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  • Forging-rolling composite processing and heat treatment process of a near-α-type high-temperature titanium alloy
  • Forging-rolling composite processing and heat treatment process of a near-α-type high-temperature titanium alloy
  • Forging-rolling composite processing and heat treatment process of a near-α-type high-temperature titanium alloy

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Embodiment 1

[0033] The near-α type high-temperature titanium alloy of this embodiment has the composition elements by mass percentage as Al: 6.0%, Sn: 3.0%, Zr: 2.5%, Mo: 0.5%, Nb: 1.0%, Ta: 1.0%, Si : 0.4%, Er: 0.2%, the rest is Ti, the high-temperature titanium alloy ingot is obtained by conventional casting method, and then the β / (α+β) phase transition point of the alloy is obtained by DSC (differential scanning calorimeter) test. 1014°C. In the first step, the 1150°C beta single-phase zone forging is carried out, and then the Widmandarin bar is forged in the 1014°C beta phase zone. In the second step, the material with an equiaxed structure obtained in the first step was heated to 980° C. for 20 minutes, and the first pass was rapidly rolled with a deformation amount of 10%. In the third step, the alloy material obtained in the second step is subjected to a second pass of hot rolling, the alloy of the second step is returned to the furnace for 5 minutes, the hot rolling temperature i...

Embodiment 2

[0035]The near-α type high-temperature titanium alloy of this embodiment has the composition elements by mass percentage as Al: 6.0%, Sn: 3.0%, Zr: 2.5%, Mo: 0.5%, Nb: 1.0%, Ta: 1.0%, Si: 0.4%, Er: 0.2%, the rest is Ti, the high temperature titanium alloy ingot is obtained by conventional casting method, and then the β / (α+β) phase transition point of the alloy is obtained by DSC (differential scanning calorimeter) test and is 1014 °C. The first step is to open up and forge through the 1150 ℃ beta single-phase region, and then forge the Widmanners structure bar in the 1014 ℃ β phase region. In the second step, the material with an equiaxed structure obtained in the first step was heated to 980° C. for 20 minutes, and the first pass was rapidly rolled with a deformation amount of 11%. In the third step, the alloy material obtained in the second step is subjected to a second pass of hot rolling, the alloy in the second step is returned to the furnace for 5 minutes, the hot rolli...

Embodiment 3

[0037] The near-α type high-temperature titanium alloy of this embodiment has the composition elements by mass percentage as Al: 6.0%, Sn: 3.0%, Zr: 2.5%, Mo: 0.5%, Nb: 1.0%, Ta: 1.0%, Si: 0.4%, Er: 0.2%, the rest is Ti, the high temperature titanium alloy ingot is obtained by conventional casting method, and then the β / (α+β) phase transition point of the alloy is obtained by DSC (differential scanning calorimeter) test and is 1014 °C. The first step is to open up and forge through the 1150 ℃ beta single-phase region, and then forge the Widmanners structure bar in the 1014 ℃ β phase region. In the second step, the material with an equiaxed structure obtained in the first step was heated to 980° C. for 20 minutes, and the first pass was rapidly rolled with a deformation amount of 10%. In the third step, the alloy material obtained in the second step is subjected to a second pass of hot rolling, the alloy of the second step is returned to the furnace for 5 minutes, the hot roll...

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Abstract

The invention discloses a forging-rolling composite processing and heat treatment process of a near-alpha high-temperature titanium alloy, which belongs to the technical field of titanium alloy preparation. Firstly, high-temperature titanium alloy with Widmanstatten structure is obtained by forging in β-phase region. Insulate at 980°C for 20 minutes below its β / (α+β) phase transition point to make the internal temperature uniform. After the temperature is uniform, the alloy is then hot-rolled. There are three passes in total. Insulation for 5 minutes between passes, and air-cooled annealing after rolling, the total deformation is 46%, and a large amount of α is obtained. p and a very small amount of α s High temperature titanium alloy plate with equiaxed structure of β and β. Afterwards, a high-temperature titanium alloy double-state structure plate is obtained by heat treatment. The invention successfully prepares the equiaxed structure and the double-state structure, and simultaneously improves the problem of uneven forging structure of the titanium alloy.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy preparation, in particular to the field of thermomechanical processing for deformation and phase transformation control, and particularly relates to a composite processing technology of near-α type high temperature titanium alloy through forging and rolling. When preparing the dual-state structure of high-temperature titanium alloys, the forging temperature range has strict requirements, and the failure rate of the forging process is high. Once the forging temperature is too high, the forging structure becomes the Widmanderin structure and cannot be obtained by subsequent heat treatment. Through the forging and subsequent hot rolling process, the invention expands the forging temperature range, improves the uniformity of the structure, and has important application value in the aerospace field. Background technique [0002] Aero-engines with high thrust-to-weight ratios have higher and high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22F1/183C22C14/00
Inventor 李伯龙齐安舟亓鹏汤庆辉聂祚仁
Owner BEIJING UNIV OF TECH
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