CN106756694B - A kind of TA19 titanium alloys obtain the solid solution treatment process of half isometry tissue - Google Patents
A kind of TA19 titanium alloys obtain the solid solution treatment process of half isometry tissue Download PDFInfo
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- CN106756694B CN106756694B CN201611199018.4A CN201611199018A CN106756694B CN 106756694 B CN106756694 B CN 106756694B CN 201611199018 A CN201611199018 A CN 201611199018A CN 106756694 B CN106756694 B CN 106756694B
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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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- 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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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention provides the solid solution treatment process that a kind of TA19 titanium alloys obtain half isometry tissue, it will have bifurcation or equiaxed structure TA19 titanium alloy profiles or parts to use quick mode of heating, 800 ~ 1100 DEG C are heated to the speed of 100 ~ 1000 DEG C/s, keeps the temperature 1 ~ 60 second；Then, the TA19 after isothermal treatment for short time is cooled fast to 400 DEG C hereinafter, cooling rate is 50 ~ 200 DEG C/s；Finally, it directly carries out aging strengthening model or is dissolved again, then carry out aging strengthening model.Improve titanium alloy performance to realize effective control of two kinds of tissues.The invention belongs to titanium alloy microstructure control technology fields.
Description
Technical field
The present invention relates to a kind of heat processing techniques of biphase titanium alloy, belong to titanium alloy microstructure control technology field.
Background technology
The performance of titanium alloy depends primarily on microstructure morphology, and different tissues corresponds to different mechanical properties.Such as
Shown in Fig. 1, the different tissues state of biphase titanium alloy is had nothing in common with each other in terms of its intensity, plasticity, fracture toughness.And titanium alloy
Microscopic structure depends primarily on chemical composition, condition of heat treatment, forging technology of titanium alloy etc., different heat treatment system and forging
Mainly its mechanical property can be controlled special by controlling the form of α phases and β phases in titanium alloy, ratio, boundary etc. under technique
Sign.
The technical solution of current linked groups' control is the finish to gauge by changing heating temperature, cooling velocity, deformation
Temperature etc. obtains the phase of different shape, phase fraction, such as：In alpha+beta phase region different temperatures, different distortion amount can obtain isometric
Tissue or mesh basket tissue；Lamella Widmannstatten structure can be obtained after being heated to above more than beta transformation point and cooling down；Equiaxed structure α+
β two-phase sections heat, and with the difference of heating temperature, can control phase fraction of isometric α phases etc..Therefore relevant biphase titanium alloy group
It knits control mode relatively to fix, and organizes based on above-mentioned conventional organization form.
Explicitly pointed out in the research report of titanium alloy tissue and property relationship, equiaxed structure have preferable plasticity and toughness,
Anti- notch sensitivity, but impact, high-temperature and durable creeping, fracture toughness etc. is poor, and the Widmannstatten structure of sheet or mesh basket tissue
Creep, enduring quality, fracture toughness is then higher.Therefore to a certain extent, effective control of two kinds of tissues can be realized
It is to need to pay close attention in titanium alloy hot-working field to improve titanium alloy performance.
Invention content
It is an object of the invention to：The solid solution treatment process that a kind of TA19 titanium alloys obtain half isometry tissue is provided, with
Effective control of two kinds of tissues is realized to improve titanium alloy performance.
To solve the above problems, intend obtaining the solution treatment work of half isometry tissue using such a TA19 titanium alloys
Skill：
To have bifurcation or equiaxed structure TA19 titanium alloy profiles or parts using sensing heating, direct resistance heating etc.
Quick mode of heating is heated to 800 ~ 1100 DEG C with the speed of 100 ~ 1000 DEG C/s, keeps the temperature 1 ~ 60 second.Due to TA19 two-phase titaniums
Component distributing and non-homogeneous in alloy, so even being an alloy, the diffusion rate of microcell transformation temperature and element is not yet
Using alpha+beta two-phase section or β monophase fields is heated rapidly to, phase transformation mainly is rapidly completed to TA19 alloys in one fixed numbers.
Then, using modes such as pressure-air, oil cooling or water coolings, using cooling rate as 50 ~ 200 DEG C/s, be cooled to 400 DEG C with
Under, the purpose is to be quickly cooled down, prevent from obtaining diffusion transformation product such as β transformation tissues in titanium alloy, obtain titanium as possible and close
Martensite phase allows regional area ingredient to remain unchanged.
Then, it directly carries out aging strengthening model or is dissolved again, then carry out aging strengthening model.Such as：By the TA19 of the tissue
Alloy is reheated to 900 ~ 1000 DEG C of the two-phase section temperature range, 20 ~ 120 minutes is kept the temperature, in a manner of normal solution treatment
Complete solid solution.In the above manner, just obtaining a kind of half isometric α phases, isometric α phases change tissue segmentation by superfine β, are formed
A kind of is isometric α phases, and the tissue morphology that α phases are divided again by lamella, the TA19 titanium alloys of the tissue morphology are with fabulous modeling
The cooperation of toughness and fracture toughness.
Compared with prior art, the organizational controls scheme in the present invention derives from influence machine of the micro-area composition to phase transition process
Reason, by mode of heating, changes the distribution of micro-area composition, by being quickly cooled down, the diffusion of micro-area composition is controlled, due to TA19 titaniums
Relationship between alloy structure ingredient realizes and obtains a kind of half isometric α phases, and isometric α phases change tissue segmentation by superfine β,
It is isometric α phases, but α phases have fabulous plasticity and toughness and fracture toughness again by the tissue morphology of lamella segmentation to be formed a kind of
Cooperation.
Description of the drawings
Fig. 1 is biphase titanium alloy typical organization；
Wherein：（a）Equiaxed structure,（b）Mesh basket tissue,（c）Bifurcation tissue,（d）Widmannstatten structure；
Fig. 2 is optics metallurgical；
Fig. 3 is the scanning electron microscope image being further amplified（SEM）；
Fig. 4 amplifies TEM image for topsheet areas.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, invention will be made by attached drawing below further
It is described in detail on ground.
Embodiment：
Referring to figs. 1 to Fig. 4, for 500mm long, the rectangular section Ti alloy profiles of 20mm × 10mm utilize high-frequency heating
Mode laser heating, section bar are gone by cold at once after induction coil, are being heated to 1030 DEG C or more by coil, are being left sense
It is quickly cooled down at once using pressure-air after answering coil.960 DEG C of solid solubility temperature range is heated to by after cooling, keeps the temperature 60 minutes
It completes to be dissolved by rapid quenching to room temperature afterwards, you can obtain above-mentioned tissue, using conventional ageing treatment, can obtain fabulous
Plasticity and toughness and fracture toughness cooperation material, wherein fracture toughness is higher than former equiaxed structure, plasticity index, the contraction percentage of area
Higher than former Widmannstatten structure.
Fig. 2 is optics metallographic；Fig. 2 a for etc. shaft-like TA19 raw material tissues, Fig. 2 b is are heated to more than beta transformation point cool down
Get off, be completely reformed into sheet Widmannstatten structure.Fig. 2 c are isometric using the Widmannstatten structure intermediate distribution white obtained by this method
The tissue of shape α phases, wherein relative to the equiaxed structure of Fig. 2 a, boundary significantly obscures, and isometric α phases refine.
Fig. 3 is the scanning electron microscope image being further amplified（SEM）, Fig. 3 a are routine TA19 equiaxed structures, and Fig. 3 b are we
It is organized obtained by method, wherein Widmannstatten structure lamella is stretched into isometric α phases and disappeared, and isometric α phases are locally divided by tiny lamella.Lamella area
Domain is amplified as shown in figure 4, Fig. 4 a are the lamella in former isometric or Widmannstatten structure, and lamella is coarse and apparent, and Fig. 4 b are this method institute
Microcell tissue in the isometric α phases of tissue is obtained, superfine lamella can be observed from figure and dividing isometric α phases, this causes original isometric
The α phases of change are divided in half grade Spindle Status.
Claims (3)
1. a kind of TA19 titanium alloys obtain the solid solution treatment process of half isometry tissue, which is characterized in that specific method is：It will tool
There are bifurcation or equiaxed structure TA19 titanium alloy profiles or parts using quick mode of heating, with the speed of 100 ~ 1000 DEG C/s
800 ~ 1100 DEG C are heated to, keeps the temperature 1 ~ 60 second；Then, the TA19 after isothermal treatment for short time is cooled fast to 400 DEG C hereinafter, cooling rate
For 50 ~ 200 DEG C/s；Finally, it directly carries out aging strengthening model or is dissolved again, then carry out aging strengthening model.
2. a kind of TA19 titanium alloys obtain the solid solution treatment process of half isometry tissue according to claim 1, feature exists
In：Technique initial period will have bifurcation or equiaxed structure TA19 titanium alloy profiles or parts to use sensing heating or direct
Electrically heated mode is quickly heated.
3. a kind of TA19 titanium alloys obtain the solid solution treatment process of half isometry tissue according to claim 1, feature exists
In：Using pressure-air, oil cooling or water cooling mode, the TA19 after isothermal treatment for short time is cooled fast to less than 400 DEG C.
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| CN110252899B (en) * | 2019-07-25 | 2021-07-02 | 哈尔滨工业大学 | Rapid heating cold die hot plate forming method for titanium alloy thin-wall component |
| CN111705280B (en) * | 2020-08-03 | 2021-06-08 | 贵州大学 | Dual-phase titanium alloy component with long fatigue life and method for improving fatigue life of dual-phase titanium alloy component |
| CN111893412B (en) * | 2020-08-12 | 2021-07-06 | 贵州大学 | High-strength dual-phase titanium alloy component and method for improving strength of dual-phase titanium alloy component |
| CN114752874B (en) * | 2022-03-25 | 2023-04-14 | 重庆大学 | Multi-scale structure for synergistically optimizing strong plasticity of TA19 titanium alloy and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103924180A (en) * | 2014-04-08 | 2014-07-16 | 中南大学 | Thermal treatment method for TC18 titanium alloy |
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| JPH01195265A (en) * | 1988-01-30 | 1989-08-07 | Nippon Steel Corp | Manufacture of high-strength beta-type titanium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103924180A (en) * | 2014-04-08 | 2014-07-16 | 中南大学 | Thermal treatment method for TC18 titanium alloy |
Non-Patent Citations (1)
| Title |
|---|
| 热处理对TA19 钛合金组织和力学性能的影响;朱雪峰等;《金属热处理》;20150228;第40卷(第2期);第103-106页 * |
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