CN107385371B - The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue - Google Patents

The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue Download PDF

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CN107385371B
CN107385371B CN201710672807.3A CN201710672807A CN107385371B CN 107385371 B CN107385371 B CN 107385371B CN 201710672807 A CN201710672807 A CN 201710672807A CN 107385371 B CN107385371 B CN 107385371B
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titanium alloy
beta titanium
processing
metastable beta
alpha phase
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CN201710672807.3A
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CN107385371A (en
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周伟
赵永庆
辛社伟
葛鹏
李倩
张思远
陈军
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西北有色金属研究院
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16Changing 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
    • C22F1/18High-melting or refractory metals or alloys based thereon
    • C22F1/183High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Abstract

The invention discloses it is a kind of obtain corynebacterium primary alpha phase tissue metastable beta titanium alloy processing method, this method are as follows: one, by metastable beta titanium alloy forging temperature be (Tβ+ 30) DEG C~(Tβ+ 50) it is kept the temperature under conditions of DEG C, is slowly cooled to room temperature after heat preservation;It two, is (T in temperature by metastable beta titanium alloy forging after coolingβ- 30) DEG C~(Tβ- 20) it is kept the temperature under conditions of DEG C;Three, hot-working is carried out to the metastable beta titanium alloy forging after heat preservation, is quickly cooled down after hot-working, obtains the metastable beta titanium alloy product with corynebacterium primary alpha phase tissue.The metastable beta titanium alloy product that the present invention obtains is transgranular to have corynebacterium primary alpha phase tissue, the advantages of this corynebacterium tissue combines lamellar structure and equiaxed structure, plasticity and toughness are improved while guaranteeing titanium alloy intensity, solves the problems, such as that metastable beta titanium alloy intensity-plasticity-toughness is difficult to matched well.

Description

The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue

Technical field

The invention belongs to titanium alloy technical field of hot working, and in particular to a kind of Asia for obtaining corynebacterium primary alpha phase tissue The processing method of steady beta titanium alloy.

Background technique

In recent years, with the development of aerospace vehicle, the research and application of titanium and titanium alloy are constantly expanded.In titanium alloy In research field, the tough metastable beta titanium alloy of height used as structural material is one of most important developing direction.Titanium alloy Microstructure determine its mechanical property, and its microstructure depends on chemical component, hot-working history and heat Treatment process.For the alloy that chemical component has determined, to obtain desired microstructure and mechanical property, can only just lead to It crosses deformation and is heat-treated to reach.For metastable beta titanium alloy, alloy, which joined more beta stable element, has alloy There is higher beta stability, there can only be tiny isometric primary alpha phase tissue using transgranular after traditional (alpha+beta) phase region forging, come into being α phase content will appear increase and decrease according to the height of forging temperature, but phase morphology will not occur significantly to change.It is this tiny isometric As-forged microstructure is difficult to change its form and size by being heat-treated.

The microscopic structure of general titanium alloy is mainly by α phase and β phase composition, and wherein α phase is used as main hardening constituent, pattern, Content and size have particularly important influence to the mechanical property of alloy.Tiny isometric α, which meets, keeps alloy with higher strong Degree and excellent plasticity, but fracture toughness index is poor.

As people are to the raising of aircraft requirements and the variation of Flight Vehicle Design theory, the intensity of titanium alloy is not required nothing more than Level is continuously improved, and higher requirements are also raised to the toughness of titanium alloy.Therefore, suitable heat processing technique is formulated, Regulate and control the microscopic features such as content and the size of different-shape α phase, bar is made to obtain intensity-plasticity-toughness matched well mechanics Performance plays a significant role in the production process of metastable beta titanium alloy.

Summary of the invention

Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of acquisition stub The processing method of the metastable beta titanium alloy of shape primary alpha phase tissue.Metastable beta titanium alloy made from the processing method has stub Shape primary alpha phase tissue, the corynebacterium primary alpha phase tissue are transformed into mixing group after using (alpha+beta) phase region solid-solution and aging heat treatment It knits, which includes corynebacterium primary alpha phase, tiny needle-shaped secondaryαphase and remnants β phase, wherein corynebacterium primary alpha phase pairing Golden plasticity, toughness are affected, and the presence of tiny needle-shaped secondaryαphase has conducive to the raising of titanium alloy intensity, thus solves Asia The problem of steady beta titanium alloy intensity-plasticity-toughness is difficult to matched well.

In order to solve the above technical problems, the technical solution adopted by the present invention is that: it is a kind of to obtain corynebacterium primary alpha phase tissue The processing method of metastable beta titanium alloy, which is characterized in that the processing method the following steps are included:

Step 1: by metastable beta titanium alloy forging temperature be (Tβ+ 30) DEG C~(Tβ+ 50) it is protected under conditions of DEG C Then temperature slowly cools to 25 DEG C of room temperatures;

Step 2: will be cooled to the metastable beta titanium alloy forging of 25 DEG C of room temperatures in step 1 in temperature is (Tβ- 30) DEG C~ (Tβ- 20) it is kept the temperature under conditions of DEG C;

Step 3: carrying out the heat that deflection is 60%~80% to the metastable beta titanium alloy forging after keeping the temperature in step 2 Processing is quickly cooled to 200 DEG C hereinafter, obtaining having the metastable beta titanium alloy of corynebacterium primary alpha phase tissue to produce after hot-working Product.

A kind of processing method of the metastable beta titanium alloy of above-mentioned acquisition corynebacterium primary alpha phase tissue, which is characterized in that The time t of heat preservation described in step 11=(D × 0.6+60) min, wherein D is that the section of the metastable beta titanium alloy forging is straight Diameter, the unit of D are mm.

A kind of processing method of the metastable beta titanium alloy of above-mentioned acquisition corynebacterium primary alpha phase tissue, which is characterized in that Cooling rate described in step 1 is 0.05 DEG C/min~0.1 DEG C/min.

A kind of processing method of the metastable beta titanium alloy of above-mentioned acquisition corynebacterium primary alpha phase tissue, which is characterized in that The time t of heat preservation described in step 22=D × 0.6min, wherein D is the diameter of section of the metastable beta titanium alloy forging, D Unit be mm.

A kind of processing method of the metastable beta titanium alloy of above-mentioned acquisition corynebacterium primary alpha phase tissue, which is characterized in that Hot-working described in step 3 is jumping-up or the pulling of a fire time.

A kind of processing method of the metastable beta titanium alloy of above-mentioned acquisition corynebacterium primary alpha phase tissue, which is characterized in that The mode of rapid cooling described in step 3 is water cooling.

Compared with the prior art, the present invention has the following advantages:

1, processing method of the invention is compared with Conventional processing methods, and alloy is before processing in advance in α/β knee pointy temperature TβAbove 30 DEG C~50 DEG C kept the temperature after Slow cooling processing and form specific Widmannstatten structure coarse alpha lamellar structure, it is this Microscopic structure is in α/β knee pointy temperature Tβ20 DEG C below~30 DEG C of (alpha+beta) phase region heats, Widmannstatten structure lamella in insulating process Passivation is gradually melted on the boundary α, so that the α lamella of passivation is cut into corynebacterium using heat processing technique, is changed primary alpha phase Form, broken due to beta stability it is strong caused by after metastable beta titanium alloy (alpha+beta) phase region forging it is transgranular can only exist it is tiny etc. The traditional understanding of axis primary alpha phase tissue.

2, the Ti-1300 titanium alloy rod bar prepared by the present invention with corynebacterium primary alpha phase tissue through solid solution aging heat at After reason, tensile strength is 1310~1350MPa, and elongation percentage 10%, fracture toughness is 62~66MPam1/2;Present invention preparation The Ti-5553 titanium alloy cake material with corynebacterium primary alpha phase tissue after solid-solution and aging heat treatment, tensile strength is 1250MPa, elongation percentage 11%, fracture toughness 67MPam1/2;It is prepared by the present invention with corynebacterium primary alpha phase tissue TB6 titanium alloy cake material is after solid-solution and aging heat treatment, tensile strength 1200MPa, elongation percentage 11%, and fracture toughness is 58MPa·m1/2;Ti-55531 titanium alloy rod bar prepared by the present invention with corynebacterium primary alpha phase tissue is through solid solution aging warm After processing, tensile strength 1230MPa, elongation percentage 12%, fracture toughness 64MPam1/2;Thus illustrate of the invention add The metastable beta titanium alloy product with corynebacterium primary alpha phase tissue of work method preparation passes through (alpha+beta) phase region solid-solution and aging heat treatment Afterwards, make titanium alloy that there is excellent intensity-plasticity-toughness matching.

Technical solution of the present invention is described in further detail below by drawings and examples.

Detailed description of the invention

Fig. 1 is the microscopic structure of Ti-1300 titanium alloy forging forging after step 1 Slow cooling in the embodiment of the present invention 1 Figure.

Fig. 2 be in the embodiment of the present invention 1 Ti-1300 titanium alloy forging micro- group of bar obtained after step 3 water cooling Knit figure.

Fig. 3 is the Ti-1300 titanium alloy rod bar obtained with corynebacterium primary alpha phase tissue of the embodiment of the present invention 1 through solid Micro-organization chart after molten aging strengthening model.

Specific embodiment

Embodiment 1

The processing method of the present embodiment are as follows:

Step 1: the Ti-1300 titanium alloy forging of Ф 200mm × 600mm is kept the temperature in 860 DEG C of electric furnace, protect The warm time is 180min, and Ti-1300 titanium alloy forging is cooled to 25 DEG C of rooms with the cooling velocity of 0.05 DEG C/min after the completion of heat preservation Temperature;

Step 2: the Ti-1300 titanium alloy forging being cooled to room temperature in step 1 is protected in 810 DEG C of electric furnace Temperature, soaking time 120min;

Step 3: carrying out the pulling of a fire time to the Ti-1300 titanium alloy forging after keeping the temperature in step 2, after pulling quickly Water cooling obtains the Ti-1300 titanium alloy rod bar of Ф 40mm × 15000mm to 180 DEG C;One fire of Ti-1300 titanium alloy forging pulls out Long total deflection is 80%.

Fig. 1 is the micro-organization chart of Ti-1300 titanium alloy forging forging after step 1 Slow cooling in the present embodiment, from It is coarse it can be seen that having obtained the coarse lamella α phase of typical Widmannstatten structure after step 1 isothermal holding and Slow cooling in figure Lamella α phase constitution has higher crack propagation impedance, and fracture toughness is high, but plasticity is poor.Fig. 2 is Ti-1300 in the present embodiment The micro-organization chart of titanium alloy forging bar obtained after step 3 water cooling, as can be seen from the figure lamella α phase boundray is passivated And it is cut into corynebacterium, the raising of corynebacterium primary alpha phase having conducive to alloy plasticity and toughness can either play sheet The performance advantage of tissue makes alloy toughness with higher, in turn avoids the relatively low defect of plasticity.

To made from the present embodiment with corynebacterium primary alpha phase tissue Ti-1300 titanium alloy rod bar carry out 790 DEG C × The solid-solution and aging heat treatment of 1h/AC+570 DEG C × 4h/AC, Fig. 3, which is that the present embodiment is obtained, has corynebacterium primary alpha phase tissue Micro-organization chart of the Ti-1300 titanium alloy rod bar after solid-solution and aging heat treatment is wherein primary alpha phase at a, is secondary α at b Phase, from figure 3, it can be seen that Ti-1300 titanium alloy microstructure is by corynebacterium primary alpha phase tissue after solid-solution and aging heat treatment Become line and staff control, which includes corynebacterium primary alpha phase, tiny needle-shaped secondaryαphase and remnants β phase, wherein corynebacterium Primary alpha phase is affected to alloy plasticity, toughness, and the presence of tiny needle-shaped secondaryαphase has conducive to the raising of titanium alloy intensity.

The conventional method of existing processing Ti-1300 titanium alloy rod bar are as follows: closed using the Ti-1300 titanium of Ф 200mm × 600mm Bodkin part obtains the Ti-1300 titanium alloy rod bar of Ф 40mm × 15000mm in (alpha+beta) phase region after the pulling processing of a fire time, Deflection is 80%.

To Ti-1300 titanium alloy bar made from Ti-1300 titanium alloy rod bar made from the present embodiment and existing processing method Material carries out the solid-solution and aging heat treatment of 790 DEG C × 1h/AC+570 DEG C × 4h/AC, then surveys its mechanical property, as a result such as table 1 It is shown.

Mechanical property experimental results of the table 1Ti-1300 titanium alloy rod bar after solid-solution and aging heat treatment

Processing method Tensile strength (MPa) Elongation percentage (%) Fracture toughness (MPam1/2) Embodiment 1 1350 10 62 Existing method 1370 10 45

As can be drawn from Table 1, the Ti- with corynebacterium primary alpha phase tissue obtained using the present embodiment processing method While mechanical property of 1300 titanium alloy rod bars after (alpha+beta) phase region solid-solution and aging heat treatment is in proof strength significantly The toughness for improving alloy makes Ti-1300 titanium alloy have excellent intensity-plasticity-toughness matching.

Embodiment 2

The processing method of the present embodiment are as follows:

Step 1: the Ti-5553 titanium alloy forging of Ф 200mm × 500mm is kept the temperature in 875 DEG C of electric furnace, protect The warm time is 180min, and Ti-5553 titanium alloy forging is cooled to 25 DEG C of rooms with the cooling velocity of 0.07 DEG C/min after the completion of heat preservation Temperature;

Step 2: the Ti-5553 titanium alloy forging being cooled to room temperature in step 1 is protected in 815 DEG C of electric furnace Temperature, soaking time 120min;

Step 3: carrying out the jumping-up of a fire time to the Ti-5553 titanium alloy forging after keeping the temperature in step 2, after jumping-up quickly Water cooling obtains the Ti-5553 titanium alloy cake material of Ф 500mm × 80mm to 190 DEG C;One fire time jumping-up of Ti-5553 titanium alloy forging Total deformation be 60%.

By optical microscopy to micro- group of the Ti-5553 titanium alloy cake material obtained in the present embodiment through step 3 jumping-up It knits and is observed, found in the microscopic structure and embodiment 1 of Ti-5553 titanium alloy cake material made from the present embodiment through step 3 The structure goodness of fit of the microscopic structure obtained after pulling processing is higher, this illustrates that the present embodiment has been made with corynebacterium primary α The Ti-5553 titanium alloy cake material of phase constitution.

The conventional method of existing processing Ti-5553 titanium alloy cake material are as follows: closed using the Ti-5553 titanium of Ф 200mm × 500mm Bodkin part obtains the Ti-5553 titanium alloy cake material of Ф 500mm × 80mm in (alpha+beta) phase region after the jumping-up processing of a fire time, becomes Shape amount is 60%.

To Ti-5553 titanium alloy cake made from Ti-5553 titanium alloy cake material made from the present embodiment and existing processing method Material carries out the solid-solution and aging heat treatment of 800 DEG C × 1h/AC+580 DEG C × 4h/AC, then surveys its mechanical property, as a result such as table 2 It is shown.

Mechanical property experimental results of the table 2Ti-5553 titanium alloy cake material after solid-solution and aging heat treatment

Processing method Tensile strength (MPa) Elongation percentage (%) Fracture toughness (MPam1/2) Embodiment 2 1250 11 67 Existing method 1300 9 43

As can be drawn from Table 2, the Ti- with corynebacterium primary alpha phase tissue obtained using the present embodiment processing method Mechanical property of the 5553 titanium alloy cake materials after (alpha+beta) phase region solid-solution and aging heat treatment improves while guaranteeing alloy strength Toughness and elongation percentage make Ti-5553 titanium alloy cake material have excellent intensity-plasticity-toughness matching.

Embodiment 3

The processing method of the present embodiment are as follows:

Step 1: the TB6 titanium alloy forging of Ф 150mm × 320mm is kept the temperature in 850 DEG C of electric furnace, when heat preservation Between be 150min, TB6 titanium alloy forging is cooled to 25 DEG C of room temperatures with the cooling velocity of 0.09 DEG C/min after the completion of heat preservation;

Step 2: the TB6 titanium alloy forging being cooled to room temperature in step 1 is kept the temperature in 790 DEG C of electric furnace, protect The warm time is 90min;

Step 3: the jumping-up of a fire time is carried out to the TB6 titanium alloy forging after keeping the temperature in step 2, quick water cooling after jumping-up To 170 DEG C, the TB6 titanium alloy cake material of Ф 500mm × 28.8mm is obtained;The total deformation of one fire time jumping-up of TB6 titanium alloy forging It is 70%.

It is carried out by microscopic structure of the optical microscopy to the TB6 titanium alloy cake material that the present embodiment is obtained through step 3 jumping-up Observation is found in the microscopic structure and embodiment 1 of TB6 titanium alloy cake material made from the present embodiment after step 3 pulling processing The structure goodness of fit of obtained microscopic structure is higher, this illustrates that the TB6 with corynebacterium primary alpha phase tissue has been made in the present embodiment Titanium alloy cake material.

The conventional method of existing processing TB6 titanium alloy cake material are as follows: existed using the TB6 titanium alloy forging of Ф 150mm × 320mm (alpha+beta) phase region obtains the TB6 titanium alloy cake material of Ф 500mm × 28.8mm, deflection 80% after the jumping-up processing of a fire time.

TB6 titanium alloy cake material made from TB6 titanium alloy cake material made from the present embodiment and existing processing method is carried out Then the solid-solution and aging heat treatment of 760 DEG C × 1h/AC+560 DEG C × 6h/AC surveys its mechanical property, the results are shown in Table 3.

Mechanical property experimental results of the table 3TB6 titanium alloy cake material after solid-solution and aging heat treatment

Processing method Tensile strength (MPa) Elongation percentage (%) Fracture toughness (MPam1/2) Embodiment 3 1200 11 58 Existing method 1210 9 41

As can be drawn from Table 3, the TB6 titanium with corynebacterium primary alpha phase tissue obtained using the present embodiment processing method Mechanical property of the alloy cake material after (alpha+beta) phase region solid-solution and aging heat treatment improves toughness while guaranteeing alloy strength And elongation percentage, make TB6 titanium alloy cake material that there is excellent intensity-plasticity-toughness matching.

Embodiment 4

The processing method of the present embodiment are as follows:

Step 1: the Ti-55531 titanium alloy forging of Ф 150mm × 400mm is kept the temperature in 890 DEG C of electric furnace, protect The warm time is 150min, and Ti-55531 titanium alloy forging is cooled to 25 DEG C of rooms with the cooling velocity of 0.1 DEG C/min after the completion of heat preservation Temperature;

Step 2: will be cooled in step 1 the Ti-55531 titanium alloy forging of 25 DEG C of room temperatures in 820 DEG C of electric furnace into Row heat preservation, soaking time 90min;

Step 3: the pulling of a fire time is carried out to the Ti-55531 titanium alloy forging after keeping the temperature in step 2, it is fast after pulling Fast water cooling obtains the Ti-55531 titanium alloy rod bar of Ф 30mm × 10000mm to 180 DEG C;One fire of Ti-55531 titanium alloy forging The total deformation of secondary pulling is 80%.

Pass through micro- group of the Ti-55531 titanium alloy rod bar that optical microscopy pulls out the present embodiment through step 3 It knits and is observed, found in the microscopic structure and embodiment 1 of Ti-55531 titanium alloy rod bar made from the present embodiment through step The structure goodness of fit of the microscopic structure obtained after three pullings processing is higher, this illustrates that this implementation has been made with corynebacterium primary α The Ti-55531 titanium alloy rod bar of phase constitution.

The conventional method of existing processing Ti-55531 titanium alloy rod bar are as follows: use the Ti-55531 titanium of Ф 150mm × 400mm Alloy forged piece obtains the Ti-55531 titanium alloy bar of Ф 30mm × 10000mm in (alpha+beta) phase region after the pulling processing of a fire time Material, deflection 80%.

To Ti-55531 titanium alloy made from Ti-55531 titanium alloy rod bar made from the present embodiment and existing processing method Bar carries out the solid-solution and aging heat treatment of 790 DEG C × 1h/AC+550 DEG C × 6h/AC, then surveys its mechanical property, as a result such as table Shown in 4.

Mechanical property experimental results of the table 4Ti-55531 titanium alloy rod bar after solid-solution and aging heat treatment

Processing method Tensile strength (MPa) Elongation percentage (%) Fracture toughness (MPam1/2) The present embodiment 1230 12 64 Existing method 1250 10 44

As can be drawn from Table 4, the Ti- with corynebacterium primary alpha phase tissue obtained using the present embodiment processing method Mechanical property of 55531 titanium alloy rod bars after (alpha+beta) phase region solid-solution and aging heat treatment mentions while guaranteeing alloy strength High toughness and elongation percentage, make Ti-55531 titanium alloy rod bar have excellent intensity-plasticity-toughness matching.

Embodiment 5

The processing method of the present embodiment are as follows:

Step 1: the Ti-1300 titanium alloy forging of Ф 150mm × 600mm is kept the temperature in 880 DEG C of electric furnace, protect The warm time is 150min, and Ti-1300 titanium alloy forging is cooled to 25 DEG C of rooms with the cooling velocity of 0.06 DEG C/min after the completion of heat preservation Temperature;

Step 2: the Ti-1300 titanium alloy forging being cooled to room temperature in step 1 is protected in 800 DEG C of electric furnace Temperature, soaking time 90min;

Step 3: carrying out the pulling of a fire time to the Ti-1300 titanium alloy forging after keeping the temperature in step 2, after pulling quickly Water cooling obtains the Ti-1300 titanium alloy rod bar of Ф 45mm × 6666.7mm to 160 DEG C;One fire of Ti-1300 titanium alloy forging pulls out Long total deformation is 70%.

By optical microscopy to micro- group of the Ti-1300 titanium alloy rod bar pulled out in the present embodiment through step 3 It knits and is observed, it is found that the microscopic structure of Ti-1300 titanium alloy rod bar made from the present embodiment is pulled out with embodiment 1 through step 3 The microstructure goodness of fit obtained after long processing is higher, this illustrates that the present embodiment has been made with corynebacterium primary alpha phase group The Ti-1300 titanium alloy rod bar knitted.

The conventional method of existing processing Ti-1300 titanium alloy rod bar are as follows: closed using the Ti-1300 titanium of Ф 150mm × 600mm Bodkin part obtains the Ti-1300 titanium alloy rod bar of Ф 45mm × 6667mm, deformation in (alpha+beta) phase region after a fire time pulling processing Amount is 80%.

To Ti-1300 titanium alloy bar made from Ti-1300 titanium alloy rod bar made from the present embodiment and existing processing method Material carries out the solid-solution and aging heat treatment of 760 DEG C × 1h/AC+550 DEG C × 6h/AC, then surveys its mechanical property, as a result such as table 5 It is shown.

Mechanical property experimental results of the table 5Ti-1300 titanium alloy rod bar after solid-solution and aging heat treatment

Processing method Tensile strength (MPa) Elongation percentage (%) Fracture toughness (MPam1/2) The present embodiment 1310 10 66 Existing method 1340 10 42

As can be drawn from Table 5, the Ti- with corynebacterium primary alpha phase tissue obtained using the present embodiment processing method Mechanical property of 1300 titanium alloy rod bars after (alpha+beta) phase region solid-solution and aging heat treatment while guaranteeing alloy strength substantially Fracture toughness is improved to degree, makes Ti-1300 titanium alloy rod bar that there is excellent intensity-plasticity-toughness matching.

The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention Protection scope in.

Claims (5)

1. a kind of processing method for the metastable beta titanium alloy for obtaining corynebacterium primary alpha phase tissue, which is characterized in that this method packet Include following steps:
Step 1: by metastable beta titanium alloy forging temperature be (Tβ+ 30) DEG C~(Tβ+ 50) it is kept the temperature under conditions of DEG C, so After slowly cool to 25 DEG C of room temperatures;The time t of the heat preservation1=(D × 0.6+60) min, wherein D is that described metastable beta titanium closes The diameter of section of bodkin part, the unit of D are mm;
Step 2: will be cooled to the metastable beta titanium alloy forging of 25 DEG C of room temperatures in step 1 in temperature is (Tβ- 30) DEG C~(Tβ- DEG C 20) kept the temperature under conditions of;
Step 3: the hot-working that deflection is 60%~80% is carried out to the metastable beta titanium alloy forging after keeping the temperature in step 2, 200 DEG C are quickly cooled to after hot-working hereinafter, obtaining the metastable beta titanium alloy product with corynebacterium primary alpha phase tissue.
2. a kind of processing method of metastable beta titanium alloy for obtaining corynebacterium primary alpha phase tissue according to claim 1, It is characterized in that, rate cooling described in step 1 is 0.05 DEG C/min~0.1 DEG C/min.
3. a kind of processing method of metastable beta titanium alloy for obtaining corynebacterium primary alpha phase tissue according to claim 1, It is characterized in that, the time t of heat preservation described in step 22=D × 0.6min, wherein D is the metastable beta titanium alloy forging Diameter of section, the unit of D are mm.
4. a kind of processing method of metastable beta titanium alloy for obtaining corynebacterium primary alpha phase tissue according to claim 1, It is characterized in that, hot-working described in step 3 is jumping-up or the pulling of a fire time.
5. a kind of processing method of metastable beta titanium alloy for obtaining corynebacterium primary alpha phase tissue according to claim 1, It is characterized in that, the mode of rapid cooling described in step 3 is water cooling.
CN201710672807.3A 2017-08-08 2017-08-08 The processing method for obtaining the metastable beta titanium alloy of corynebacterium primary alpha phase tissue CN107385371B (en)

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CN108559935B (en) * 2018-07-05 2019-12-06 长沙理工大学 Rapid composite heat treatment process for improving mechanical property of titanium alloy
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