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Microstructure and properties control method of near-α-type titanium alloy under isothermal local loading transition zone

A technology of isothermal local loading and microstructure properties, applied in the field of thermal processing, can solve problems such as microstructure, reduction, and mechanical properties of uneven transition zones, and achieve the effect of no grain coarsening and stable evolution

Inactive Publication Date: 2011-06-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of coarse and uneven microstructure in the transition zone of forgings and the decrease of mechanical properties in the transition zone in the prior art, the present invention proposes a method for controlling the microstructure and properties of the transition zone of forgings formed by isothermal local loading of near-α-type titanium alloys

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  • Microstructure and properties control method of near-α-type titanium alloy under isothermal local loading transition zone

Examples

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Effect test

Embodiment 1

[0024] This embodiment is a TA15 titanium alloy integral rib member produced by a steel company. It is formed by an isothermal local loading mold consisting of 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 position corresponding to the boundary line of the inner mold and the outer mold and its adjacent area is the transition zone. 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:

[0025] The first step is to forge the blank. TA15 titanium alloy ingots are heated to T in a resistance furnace β +100°C, heat preservation for 2 hours, upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then the blank is heated to T in the resistance furnace β -40℃, heat preservation for 1.5h, repeated upsetting and drawing...

Embodiment 2

[0034] This embodiment is a TA15 titanium alloy integral rib member produced by a steel company. It is formed by an isothermal local loading mold consisting of 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 position corresponding to the boundary line of the inner mold and the outer mold and its adjacent area is the transition zone. 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:

[0035] 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, upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then the blank is heated to T in the resistance furnace β -40℃, heat preservation for 1.5h, repeated upsetting and drawing ...

Embodiment 3

[0044] This embodiment is a TA15 titanium alloy integral rib member produced by a steel company. It is formed by an isothermal local loading mold consisting of three block molds on the left, middle and right. The middle module forms the middle part of the workpiece, and the left and right modules move simultaneously. On both sides of the formed workpiece, the position corresponding to the boundary line between the middle module and the left and right modules on the workpiece and its adjacent area are transition zones. 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:

[0045] 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, upsetting and drawing on the fast forging machine, the deformation amount is 50% to 60%, water cooling after forging; then the blank is heated to T in the resistance fur...

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Abstract

The invention is a method for controlling the microstructure and properties of the transition zone under isothermal local loading of a near-α-type titanium alloy. The microstructure and properties of the transition zone are controlled throughout the entire thermal processing process. Process parameters in heat treatment to control the structure and properties of the transition zone. The ingot is water-cooled in the β-phase region, and re-forged at 40-50°C below the phase transition point, and water-cooled after forging. The number of local loading passes shall not exceed 2 times, the heating forging temperature shall be 20-30°C below the phase transition point, and the deformation speed shall be 0.01-0.02s -1 . After partial loading, press the press for 10 to 15 minutes to finish the forging. Rapid water cooling after forging, using strengthening and toughening heat treatment. The invention can effectively control the microstructure of the transition zone in local loading forming, and obtain a fine and uniform equiaxed α-phase + β transformation structure. The transition zone has no grain coarsening, inhomogeneity and abnormal growth, and has stable structure and mechanical strength. Good performance features.

Description

1. Technical field [0001] The invention relates to the field of thermal processing, in particular to a method for controlling the microstructure and properties of a near-α-type titanium alloy isothermally locally loaded in a transition zone. 2. Technical Background [0002] Titanium alloy components for aerospace have high requirements on microstructure and mechanical properties. For near-α-type titanium alloys, die forgings require a uniform and fine equiaxed α-phase + β-transition structure to achieve a good match in mechanical properties. When using isothermal local loading to produce titanium alloy parts, the forging is only partially loaded and deformed at each forming stage, and there are loaded deformation zones, unloaded zones and transition zones on the forging during the forming process. The transition zone is deformed by the influence of the loaded zone and the unloaded zone, and the deformation non-uniformity increases. At the same time, the heating times and pr...

Claims

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Application Information

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IPC IPC(8): C22F1/18B21J5/02
Inventor 孙志超杨合樊晓光周建华苑世剑周义刚王晓英吴跃江
Owner NORTHWESTERN POLYTECHNICAL UNIV
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