CN109023190A - A kind of heat treatment method improving TC21 diphasic titanium alloy hardness - Google Patents
A kind of heat treatment method improving TC21 diphasic titanium alloy hardness Download PDFInfo
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- CN109023190A CN109023190A CN201811168592.2A CN201811168592A CN109023190A CN 109023190 A CN109023190 A CN 109023190A CN 201811168592 A CN201811168592 A CN 201811168592A CN 109023190 A CN109023190 A CN 109023190A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The present invention discloses a kind of heat treatment method for improving TC21 diphasic titanium alloy hardness, belongs to titanium alloy technical field of heat treatment.Change method by after β is forged TC21 diphasic titanium alloy heat, keep the temperature and water quenching more than transformation temperature, obtain full rectangle martensitic structure, to rectangle martensitic structure in 500~550 DEG C of progress temperings, obtain nanoscale twin α phase constitution, compared with forging tissue, which significantly improves the hardness of TC21 titanium alloy.Since the harden ability of TC21 titanium alloy is good, it is easy to get full martensitic structure, the method for the present invention technological parameter is few, and feasibility is strong, and easy to operate, performance is stablized, and is conducive to the industrialized production of TC21.
Description
Technical field:
The invention belongs to titanium alloy technical field of heat treatment, specifically, it is hard to be related to a kind of raising TC21 diphasic titanium alloy
The heat treatment method of degree.
Background technique:
Titanium alloy has excellent performance, such as corrosion resistance, specific strength are high, inoxidizability, in aerospace, ocean work
The fields such as journey, biomedicine and sports goods have a wide range of applications.Diphasic titanium alloy is in titanium alloy family using most
A kind of alloy system, two-phase include hexagonal crystal system α phase and body-centered cubic β phase.TC21 diphasic titanium alloy is one kind that China develops
Novel high-strength and high-ductility titanium alloy, is mainly used in aerospace field.Under the conditions of some special applications, it is desirable that TC21 titanium
Alloy has high hardness.There are mainly two types of the conventional methods for improving TC21 titanium alloy hardness and strength.One is in two-phase section
The method of rolling, by rolling refined α and β phase constitution, to improve the hardness of alloy.Due to the more difficult deformation of diphasic titanium alloy,
By the method low efficiency of high temperature rolling, energy consumption is high.Another method is by solid solution+ageing treatment method, in titanium alloy
Matrix in tiny secondary phase is precipitated, to improve the hardness of titanium alloy, this method improves the stiffening effect of TC21 titanium alloy
Generally.
Summary of the invention:
The object of the present invention is to provide a kind of heat treatment methods for improving TC21 diphasic titanium alloy hardness.Since TC21 titanium closes
The harden ability of gold is good, is easy to get rectangle martensitic structure by cold water quenching, the present invention is by being higher than transformation temperature temperatures above
Cold water quenching is carried out, ageing treatment is then carried out, rectangle martensite is undergone phase transition in ag(e)ing process, nano twin crystal α phase is formed,
The nano twin crystal can significantly improve the hardness of TC21 diphasic titanium alloy.Specific step is as follows for the method for the present invention:
(1) heat treatment of raw materials is chosen:
TC21 titanium alloy is subjected to β conducting forging processing first, the TC21 titanium alloy rod bar after obtaining β forging, after the β forging
TC21 titanium alloy rod bar have the alternately arranged lamellar structure of alpha+beta two-phase；The β is forged to common one in titanium alloy field
Kind forging processing technology.
(2) quenching heat treatment:
More than the TC21 titanium alloy transformation temperature that heat-treatment furnace is heated to after β forging 30 DEG C~100 DEG C, after the β forging
TC21 titanium alloy transformation temperature be that TC21 is completely reformed into the temperature of β phase, the transformation temperature of the TC21 titanium alloy after the β forging is
960 DEG C, it is small that the TC21 titanium alloy rod bar after step (1) the β forging is then placed on heat preservation 4~8 in the heat-treatment furnace
When after quench, hardening media is water, and the water temperature is 0 DEG C~15 DEG C, the TC21 titanium alloy sample after obtaining being quenched heat treatment；
TC21 titanium alloy sample after the quenching heat treatment has rectangle martensitic structure.
(3) ageing treatment:
Heat-treatment furnace is warming up to 500 DEG C~550 DEG C, step (2) the TC21 titanium alloy sample is then placed on institute
It states in heat-treatment furnace and keeps the temperature 4 hours~6 hours, then carry out air-cooled.
The present invention by the TC21 diphasic titanium alloy raw material after β is forged transformation temperature temperatures above heating, heat preservation and
Then quenching carries out ageing treatment to quenching structure, obtain nanometer alpha phase feather organization, and the tissue relatively forging tissue significantly mentions
The hardness of high TC21 titanium alloy.The present invention is compared with the method for conventional raising TC21 titanium alloy hardness, present invention heat treatment
Method is simple, and technological parameter is few, and feasibility is strong, easy to operate, and performance is stablized, and is conducive to the industrialized production of TC21 titanium alloy.
Detailed description of the invention:
Fig. 1 be in the embodiment of the present invention 1 TC21 titanium alloy quenching after by scanning electron microscopic observation to martensitic structure show
It is intended to；
Fig. 2 is the nano twin crystal α arrived after TC21 titanium alloy ageing treatment by transmission electron microscope observing in the embodiment of the present invention 1
Phase schematic diagram；
Fig. 3 is the transmission electron microscope diffraction for passing through nano twin crystal α phase in the embodiment of the present invention 1 after TC21 titanium alloy ageing treatment
Figure；
Fig. 4 is the heat treatment method schematic diagram that nano twin crystal TC21 titanium alloy is obtained in the embodiment of the present invention 1.
Specific embodiment:
TC21 titanium alloy rod bar after the raw materials used forging for β of various embodiments of the present invention, the TC21 titanium alloy bar after β forging
The nominal composition of material is Ti-6Al-2Zr-2Sn-3Mo-1Cr-2Nb-0.2Si.
Embodiment 1: specific step is as follows for the present embodiment:
(1) the TC21 titanium alloy rod bar after β is forged is processed into the titanium alloy sample of 60 × 60 × 120mm of size.
(2) after heat-treatment furnace being warming up to 1050 DEG C, titanium alloy sample is placed, water quenching after 4h is kept the temperature, 10 DEG C of water temperature, obtains
Sample is quenched, all rectangle martensite is organized.From the blocky sample of quenching sample interception 20 × 20 × 10, by sample grinding and polishing
And corrosion, the martensitic structure observed by scanning electron microscope (SEM) are as shown in Figure 1.
(3) heat-treatment furnace is warming up to 500 DEG C, step (1) is then obtained into quenching sample and is put into heating furnace, is kept the temperature
4h, it is then air-cooled, ageing treatment sample is obtained, tissue is nano twin crystal α phase and β phase.It is intercepted from ageing treatment sample
20 × 20 × 10 blocky samples, further prepare transmission electron microscope sample, the nano twin crystal α phase that transmission electron microscope (TEM) is observed is such as
Shown in Fig. 2, Fig. 3 is the TEM diffraction images of nano twin crystal.
Under the same conditions to heat treatment of raw materials forging state TC21 titanium alloy, step (2) quenching structure TC21 titanium alloy
It is tested with the hardness of three kinds of samples of TC21 titanium alloy of step (3) ageing treatment, the TC21 titanium that the method for the present invention obtains closes
The hardness of gold significantly improves, and occurrence is shown in Table 1.
The TC21 titanium alloy sample of ageing treatment, quenching sample and heat treatment of raw materials hardness number in 1 embodiment 1 of table
Embodiment 2: specific step is as follows for the present embodiment:
(1) by the TC21 titanium alloy rod bar after β is forged, it is processed into the titanium alloy sample of 60 × 60 × 120mm of size.
(2) after heat-treatment furnace being warming up to 1020 DEG C, titanium alloy sample is placed, water quenching after 4h is kept the temperature, 10 DEG C of water temperature, obtains
Sample is quenched, all rectangle martensite is organized.
(3) heat-treatment furnace being warming up to 500 DEG C, placement step (2) obtains quenching sample and is put into heating furnace, 4h is kept the temperature,
Then air-cooled, Aging Microstructure is nano twin crystal α phase and β phase.
State TC21 titanium alloy, the quenching sample of step (2) and step (3) ageing treatment are forged to raw material under the same conditions
The hardness of three kinds of samples of TC21 titanium alloy is tested, and discovery is significant by the hardness for the TC21 titanium alloy that the method for the present invention obtains
It improves, hardness number 523HV.
Embodiment 3: specific step is as follows for the present embodiment:
(1) by the TC21 titanium alloy rod bar after β is forged, it is processed into the titanium alloy sample of 60 × 60 × 120mm of size.
(2) after heat-treatment furnace being warming up to 1000 DEG C, titanium alloy sample is placed, water quenching after 4h is kept the temperature, 10 DEG C of water temperature, obtains
The all rectangle martensite of quenching structure.
(3) heat-treatment furnace is warming up to 550 DEG C, places, and step (2) obtains quenching structure sample and is put into heating furnace, keeps the temperature
3h, then air-cooled, Aging Microstructure is nano twin crystal α phase and β phase.
Under the same conditions to raw material forging state TC21 titanium alloy, step (2) quenching structure TC21 titanium alloy and step
(3) hardness for quenching three kinds of samples of TC21 titanium alloy of ageing treatment is tested, what discovery was obtained by the method for the present invention
The hardness of TC21 titanium alloy significantly improves, hardness number 520HV.
Claims (1)
1. a kind of heat treatment method for improving TC21 diphasic titanium alloy hardness, it is characterised in that the heat treatment method specific steps are such as
Under:
(1) heat treatment of raw materials is chosen:
TC21 titanium alloy is subjected to β conducting forging processing first, the TC21 titanium alloy rod bar after obtaining β forging, after the β forging
TC21 titanium alloy rod bar has the alternately arranged lamellar structure of alpha+beta two-phase；
(2) quenching heat treatment:
More than the TC21 titanium alloy transformation temperature that heat-treatment furnace is heated to after β forging 30 DEG C~100 DEG C, after the β forging
TC21 titanium alloy transformation temperature is the temperature that TC21 is completely reformed into β phase, and the transformation temperature of the TC21 titanium alloy after the β forging is
960 DEG C, it is small that the TC21 titanium alloy rod bar after step (1) the β forging is then placed on heat preservation 4~8 in the heat-treatment furnace
When after quench, hardening media is water, and water temperature is 0 DEG C~15 DEG C, described in the TC21 titanium alloy sample after obtaining being quenched heat treatment
TC21 titanium alloy sample after quenching heat treatment has rectangle martensitic structure；
(3) ageing treatment:
Heat-treatment furnace is warming up to 500 DEG C~550 DEG C, step (2) the TC21 titanium alloy sample is then placed on the heat
4 hours~6 hours are kept the temperature in treatment furnace, is then carried out air-cooled.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210737A (en) * | 2020-10-16 | 2021-01-12 | 太原理工大学 | Two-stage phase-change heat treatment method for improving hardness of Ti-6Al-4V titanium alloy |
| CN115194180A (en) * | 2022-08-02 | 2022-10-18 | 暨南大学 | Heat treatment method for manufacturing titanium alloy structure through homogenized material increase |
| CN115383085A (en) * | 2022-08-17 | 2022-11-25 | 鑫鹏源智能装备集团有限公司 | Production process of hot-rolled large-diameter thin-wall titanium alloy seamless pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210737A (en) * | 2020-10-16 | 2021-01-12 | 太原理工大学 | Two-stage phase-change heat treatment method for improving hardness of Ti-6Al-4V titanium alloy |
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| CN115194180A (en) * | 2022-08-02 | 2022-10-18 | 暨南大学 | Heat treatment method for manufacturing titanium alloy structure through homogenized material increase |
| CN115194180B (en) * | 2022-08-02 | 2024-01-30 | 暨南大学 | Heat treatment method for homogenizing titanium alloy tissue produced by additive |
| CN115383085A (en) * | 2022-08-17 | 2022-11-25 | 鑫鹏源智能装备集团有限公司 | Production process of hot-rolled large-diameter thin-wall titanium alloy seamless pipe |
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