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Thermal treatment method for improving hardness of TC21 two-phase titanium alloy

A heat treatment method, TC21 technology, applied in the field of titanium alloy heat treatment, can solve the problems of difficult deformation, high energy consumption, low efficiency, etc., and achieve the effect of stable performance, less process parameters and simple operation

Inactive Publication Date: 2018-12-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the two-phase titanium alloy is difficult to deform, the method of rolling at high temperature is inefficient and consumes a lot of energy

Method used

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  • Thermal treatment method for improving hardness of TC21 two-phase titanium alloy
  • Thermal treatment method for improving hardness of TC21 two-phase titanium alloy
  • Thermal treatment method for improving hardness of TC21 two-phase titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the specific steps of this embodiment are as follows:

[0017] (1) Process the TC21 titanium alloy bar after β forging into a titanium alloy sample with a size of 60×60×120 mm.

[0018] (2) After heating the heat treatment furnace to 1050°C, place the titanium alloy sample, keep it warm for 4 hours, and then quench it in water at a water temperature of 10°C to obtain a quenched sample whose structure is all rhomboid martensite. A block sample of 20×20×10 was cut from the quenched sample, and after the sample was ground, polished and corroded, the martensite structure observed by scanning electron microscope (SEM) was as follows: figure 1 shown.

[0019] (3) Heat the heat treatment furnace to 500 ° C, then put the quenched sample obtained in step (1) into the heating furnace, keep it warm for 4 hours, and then air-cool to obtain the aging treatment sample, whose structure is nano-twin α phase and β phase . Cut 20 × 20 × 10 block samples from the aging tr...

Embodiment 2

[0023] Embodiment 2: the specific steps of this embodiment are as follows:

[0024] (1) Process the TC21 titanium alloy bar after β forging into a titanium alloy sample with a size of 60×60×120 mm.

[0025] (2) After heating the heat treatment furnace to 1020°C, place the titanium alloy sample, keep it warm for 4 hours, and then quench it in water at a water temperature of 10°C to obtain a quenched sample whose structure is all rhomboid martensite.

[0026] (3) Heat the heat treatment furnace to 500°C, place the quenched sample obtained in step (2) into the heating furnace, keep it warm for 4 hours, and then air-cool. The aging structure is nano-twin α phase and β phase.

[0027] Under the same conditions, the hardness of the TC21 titanium alloy three kinds of samples of the raw material forged TC21 titanium alloy, the quenched sample of step (2) and the step (3) aging treatment is tested, and it is found that the TC21 titanium alloy obtained by the inventive method The hardn...

Embodiment 3

[0028] Embodiment 3: the specific steps of this embodiment are as follows:

[0029] (1) Process the TC21 titanium alloy bar after β forging into a titanium alloy sample with a size of 60×60×120 mm.

[0030] (2) After heating the heat treatment furnace to 1000°C, place the titanium alloy sample, keep it warm for 4 hours, and then quench it in water at a water temperature of 10°C. The quenched structure is all rhomboid martensite.

[0031] (3) Heat the heat treatment furnace to 550°C, place it, and put the quenched tissue sample obtained in step (2) into the heating furnace, keep it warm for 3 hours, and then air-cool. The aging structure is nano-twin α phase and β phase.

[0032] Under the same conditions, the hardness of the TC21 titanium alloy three kinds of samples of raw material forged TC21 titanium alloy, the TC21 titanium alloy of the quenched structure of step (2) and the step (3) quenching and aging treatment is tested, and it is found that the hardness obtained by the...

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Abstract

The invention discloses a thermal treatment method for improving hardness of a TC21 two-phase titanium alloy and belongs to the technical field of titanium alloy thermal treatment. According to the method, by carrying out heating, heat preservation and water quenching on the TC21 two-phase titanium alloy subjected to beta forging above the phase transformation point, a whole rhombic martensitic structure is obtained, a nanoscale twin crystal alpha-phase structure is obtained by carrying out tempering treatment on the rhombic martensitic structure at 500-550 DEG C, and compared with a forging structure, the hardness of the TC21 titanium alloy is remarkably improved through the nanoscale twin crystal alpha-phase structure. As the TC21 titanium alloy has good hardenability, the whole rhombicmartensitic structure can be easily obtained. The method provided by the invention is small in number of technical parameters, high in feasibility, easy to implement, stable in performance and beneficial for industrial production of TC21.

Description

Technical field: [0001] The invention belongs to the technical field of titanium alloy heat treatment, and in particular relates to a heat treatment method for improving the hardness of TC21 two-phase titanium alloy. Background technique: [0002] Titanium alloys have excellent properties, such as corrosion resistance, high specific strength, and oxidation resistance, and are widely used in aerospace, marine engineering, biomedicine, and sporting goods. Two-phase titanium alloy is the most widely used alloy system in the titanium alloy family. The two phases include the hexagonal α phase and the body-centered cubic β phase. TC21 two-phase titanium alloy is a new type of high-strength and high-toughness titanium alloy developed in China, which is mainly used in the aerospace field. In some special application conditions, TC21 titanium alloy is required to have high hardness. There are two main methods to conventionally improve the hardness and strength of TC21 titanium allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/002C22F1/183
Inventor 周红伟唐明星白凤梅叶昕谭李雯周佩剑何宜柱
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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