Control method of local loading and shaping equiaxial alpha content of titanium alloy

A local loading and control method technology, which is applied in heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve the problems of uneven α content in equiaxed forgings, achieve excellent mechanical properties, inhibit α phase spheroidization, and inhibit the increase of Effect

Inactive Publication Date: 2009-12-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of uneven equiaxed α content in forgings existing in the prior art, the present invention proposes a control method for equiaxed α content in local loading forming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is a TA15 titanium alloy integral rib member produced by a steel company. The upper mold is composed of two molds, an inner mold and an outer mold. The inner mold forms the middle part of the workpiece, and the outer mold forms both sides of the workpiece. The inner mold and the outer mold are simultaneously When installed on the upper mold base, it constitutes the overall upper mold. The TA15 titanium alloy ingot is smelted by three vacuum consumable arcs, and the phase transition point Tβ is 990°C. The specific operation is as follows:

[0026] The first step is to forge the blank. TA15 titanium alloy ingots are heated to T in a resistance furnace β +100°C, keep warm for 2 hours, repeatedly upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then heat the blank in the resistance furnace to T β -40℃, heat preservation for 1.5h, repeated upsetting and drawing on the fast forging machine, t...

Embodiment 2

[0037] This embodiment is a TA15 titanium alloy integral rib member produced by a steel company. The upper mold is composed of two molds, an inner mold and an outer mold. The inner mold forms the middle part of the workpiece, and the outer mold forms both sides of the workpiece. When installed on the upper mold base, it constitutes the overall upper mold. The TA15 titanium alloy ingot is melted by three vacuum consumable arcs, and the phase transition point T β It is 990°C. The specific operation is as follows:

[0038] The first step is to forge the blank. TA15 titanium alloy ingots are heated to T in a resistance furnace β +50°C, heat preservation for 3 hours, repeated upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then the blank is heated in the resistance furnace to T β -40℃, heat preservation for 1.5h, repeated upsetting and drawing on the fast forging machine, the total deformation is 50-60%, wate...

Embodiment 3

[0049] This example is a TA15 titanium alloy integral rib member produced by a steel company. The upper mold is composed of two side molds and a middle mold, a total of three molds. The middle mold forms the middle part of the workpiece, and the two side molds jointly form the two sides of the workpiece. , when the middle mold and the side mold are installed on the upper mold base at the same time, they form the overall upper mold. The TA15 titanium alloy ingot is melted by three vacuum consumable arcs, and the phase transition point T β It is 990°C. The specific operation is as follows:

[0050] The first step is to forge the blank. The ingot is heated in a resistance furnace to T β +50°C, heat preservation for 3 hours, repeated upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then the blank is heated in the resistance furnace to T β -50℃, heat preservation for 1.5h, repeated upsetting and drawing on the...

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Abstract

The invention discloses a control method of local loading and shaping equiaxial alpha content of titanium alloy. After a blank is changed to forge and is pre-shaped, a shaped forging piece is obtained by isothermal local loading and shaping, finishing and heat treating. Local loading is finished by two passes, and each pass is finished by two loading steps. A mould is divided into two to three modules, and the relative position of different modules can be adjusted. In each loading step in the same pass, different modules are used for carrying out deforming on the blank; after all loading steps in the pass are finished, the next step is started, the loading method in the last step is repeated to finish the forging piece deformation; the equiaxial alpha phase volume fraction effectively controlling the local loading and shaping of the forging piece is obtained, and is controlled within 10-20%; the equiaxial alpha phase volume fraction of different positions on the forging piece differs within 5%; equiaxial alpha crystal and beta crystal are both even and small, have no phenomena of coarsing, unevenness and extraordinary growth, and have favourable mechanical property.

Description

1. Technical field [0001] The invention relates to the field of thermal processing, in particular to a method for controlling the microstructure of titanium alloy under local loading. 2. Background technology [0002] Among the various microstructures of titanium alloys, the three-state structure has good comprehensive properties, and obtaining titanium alloy forgings with a three-state structure is the goal pursued in production. The main feature of the tri-state structure is that the content of equiaxed α phase in the structure is between 10% and 20%. If the content of equiaxed α is too small, the plasticity of the material will be reduced, and if the content is too high, the high temperature performance and fracture toughness of the material will be reduced. Local loading is a forming process for producing titanium alloy components through uneven deformation of multiple fires. Due to the large number of fires required for processing, the deformation of each forging on eac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C21D11/00
Inventor 杨合孙志超樊晓光周义刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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