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Heat treatment process for improving plasticity of cold forming beta titanium alloy after aging

A β-titanium alloy, cold forming technology, applied in the field of titanium alloy processing, can solve the problems of recrystallization growth, short holding time, abnormal growth, etc., to ensure uniformity, improve plastic deformation ability, and easy to operate Effect

Inactive Publication Date: 2009-05-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual production operation of this scheme, the holding time is difficult to control: a slightly longer time may cause recrystallization to grow, and even local abnormal growth may occur, and the effect of reducing the dislocation density will not be achieved if the time is short; in addition, Due to the short holding time, it is difficult to ensure the uniformity of the surface and core tissue of parts with different cross-sectional sizes in the same batch

Method used

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  • Heat treatment process for improving plasticity of cold forming beta titanium alloy after aging
  • Heat treatment process for improving plasticity of cold forming beta titanium alloy after aging
  • Heat treatment process for improving plasticity of cold forming beta titanium alloy after aging

Examples

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Embodiment 1

[0031] After TB3 was solidified at 820°C, it was air-cooled, and after 5% deformation at room temperature, it was aged at 500°C for 2 hours, and then the temperature was raised to 550°C for 1 hour. The internal dislocation density of the material was greatly reduced. See figure 2 . Tensile test result shows: after processing by process of the present invention, tensile strength is about 1283MPa, is higher than the aging peak strength (about 1260MPa) of no cold deformation TB3 sample, see Figure 5 The elongation rate is 0.14, which is equivalent to the elongation rate (0.15) of the peak aging state of the TB3 sample without cold deformation, see Figure 6 .

Embodiment 2

[0033] After TB3 was solidified at 820°C, it was cooled in air, and after 10% deformation at room temperature, it was aged at 500°C for 2 hours, and then the temperature was raised to 550°C for 1 hour. The internal dislocation density of the material was greatly reduced. See Figure 4 . Tensile test result shows: after processing by process of the present invention, tensile strength is about 1316MPa, higher than the aging peak strength (1260MPa) of no cold deformation TB3 sample, see Figure 5 The elongation rate is 0.126, which is equivalent to the elongation rate (0.15) of the peak aging state of the TB3 sample without cold deformation, see Figure 6 .

Embodiment 3

[0035] TB3 was solidified at 820°C and then air-cooled, subjected to 20% deformation at room temperature, then aged at 500°C for 2 hours, and then raised to 550°C for 1 hour. Tensile test result shows: after being processed by the process of the present invention, the tensile strength is 1395MPa, which is higher than the aging peak level (1260MPa) of the TB3 sample without cold deformation, see Figure 5 The elongation rate is 0.132, which is equivalent to the elongation rate (0.15) of the peak aging state of the TB3 sample without cold deformation, see Figure 6 .

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Abstract

The invention discloses a heat treatment technique for improving the aging post plasticity of cold forming Beta titanium alloy. The technique comprises the following steps of: carrying out short time aging at the normal aging temperature to Beta titanium alloy treated by solid solution and cold deformation, then properly improving the aging temperature for holding temperature for short time so as to eliminate deforming defects of dislocation remained by cold deformation and the like by a high-temperature restoring mechanical part, thus leading the plasticity of materials to be restored under the premise of guaranteeing the strength of alloy and shortening the aging time. The technique has simple operation and easy implementation and is suitable for batch processing in the industrial production process.

Description

technical field [0001] The invention belongs to the field of titanium alloy processing, and relates to a heat treatment process for titanium alloys, in particular to a heat treatment process for improving the plasticity of cold-formed β-titanium alloys after aging. Background technique [0002] For the production of fasteners used in the aerospace field, TC4 (Ti-6Al-4V) has been widely used after hot heading and vacuum solution aging treatment. The process is complex and the required processing equipment has high technical requirements, so the production cost higher. In recent years, in order to simplify the process and reduce the cost, β-titanium alloy is selected for cold forming in the solid solution state, and then aged to improve the strength of the parts. This method greatly reduces the production cost. However, due to the precipitation of α phase during aging (about 500°C) of the metastable titanium alloy after cold deformation, the recovery and recrystallization of ...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 孙巧艳宋振亚孙军肖林刘力陈威
Owner XI AN JIAOTONG UNIV
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