CN109504875A - A kind of heat treatment method obtaining Ti alloy with high performance different levels tissue - Google Patents
A kind of heat treatment method obtaining Ti alloy with high performance different levels tissue Download PDFInfo
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- CN109504875A CN109504875A CN201811307352.6A CN201811307352A CN109504875A CN 109504875 A CN109504875 A CN 109504875A CN 201811307352 A CN201811307352 A CN 201811307352A CN 109504875 A CN109504875 A CN 109504875A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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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 invention discloses a kind of heat treatment methods for obtaining Ti alloy with high performance different levels tissue, and biphase titanium alloy forging state bar is processed into plate, is heat-treated using hot modeling test machine.The present invention is aerospace TC4 titanium alloy with titanium alloy, is being heated to beta transformation point temperatures above, obtains different lamellar spacing α tissues and its grain size and its corresponding related mechanical property with 10 cooling rates.It is not only that material processing provides advantageous condition, the performance needed for it is also provided for final product.
Description
Technical field
The present invention relates to a kind of heat treatment method of titanium alloy different levels tissue, especially a kind of Ti alloy with high performance is not
The heat treatment method of same level tissue.
Background technique
TC4 titanium alloy possesses specific strength height, and the advantages that low-density, heat-proof corrosion-resistant and good weldability is at present both at home and abroad
The material that aerospace field mainly uses, in US Airways titanium alloy, TC4 titanium alloy has already taken up therein
56%, and in titanium alloy at home, account for 50%, Zhan Suoyou titanic alloy machining part 95% of TC4.Studies have shown that in β
It is cooled to room temperature with certain cooling rate after more than transformation temperature heating and keeping the temperature a period of time and will improve the fracture toughness of TC4 alloy,
The reason is that, the sample tissue after Overheating Treatment is Wei Shi lamella α tissue, many researchs have been proven that Widmannstatten structure
Fracture toughness is higher than equiaxed structure, the fracture toughness of mesh basket tissue.Microstructure observation shows to reflect in Widmannstatten structure disconnected
The crack propagation approach for splitting feature is tortuous, total length of cracks is increased, so consuming more energy.Again because of crack branching
It is more, disperse the stress field of crack tip, the energy absorbed in destructive process is big, therefore the fracture toughness of Widmannstatten structure is big, splits
Line spreading rate is small.
TC4 titanium alloy tissue not only influences Forming Quality, but also the mechanical property and service life that will directly affect its product.Mesh
The development trend of former world titanium alloy is developed towards high performance direction, and the approach of exploitation high-performance TC4 titanium alloy has exploitation
Prepare material new process, reasonable heat treatment etc..Reasonable heat treatment can not only provide for material processing
Advantageous condition, and the performance needed for it can be provided for final product.
Summary of the invention
The object of the present invention is to provide a kind of heat treatment methods of Ti alloy with high performance different levels tissue.The present invention
It is aerospace TC4 titanium alloy with titanium alloy, is being heated to beta transformation point temperatures above, is obtained with 10 cooling rates different
Lamellar spacing α tissue and its grain size and its corresponding related mechanical property.It is not only that material processing provides favorably
Condition, the performance needed for it is also provided for final product.
Technical solution of the present invention: a kind of heat treatment method obtaining Ti alloy with high performance different levels tissue, two-phase
Titanium alloy forging state bar is processed into plate, is heat-treated using hot modeling test machine.
In the heat treatment method above-mentioned for obtaining Ti alloy with high performance different levels tissue, the heat treatment is；It will be double
Phase titanium alloy sample is heated to 1000-1100 DEG C, after keeping the temperature 3-8min, respectively with 0.1 DEG C/s, and 0.5 DEG C/s, 1 DEG C/s, 5 DEG C/
S, 10 DEG C/s, 15 DEG C/s, 20 DEG C/s, 30 DEG C/s, 50 DEG C/s, 80 DEG C/s is cooled to room temperature.
In the heat treatment method above-mentioned for obtaining Ti alloy with high performance different levels tissue, the titanium alloy is TC4 titanium
Alloy.In the heat treatment method above-mentioned for obtaining Ti alloy with high performance different levels tissue, the ingredient of the TC4 titanium alloy
Mass percent are as follows: Al:5.42%；V:4.29%；Fe:0.08%；C:0.06%；Si:0.07%；Mo:0.015%；Ni:
0.01%；Cr:0.004% and B 0.002%, surplus are Ti and inevitable impurity.
Compared with prior art, the performance of titanium alloy depends primarily on its microscopic structure, and the microscopic structure of alloy takes
Certainly in the heat treatment process carried out to alloy.Reasonable heat treatment can not only provide advantageous for material processing
Condition, and the performance needed for it can be provided for final product.Therefore applicant considers to be heat-treated titanium alloy of the present invention
Technique is so that its comprehensive performance is more preferable.According to common sense it is found that various heat treatment process are almost required by slowly adding alloy
Heat arrives certain temperature, keeps enough time, then cooling with Reasonable Speed.These steps are almost must not in heat treatment process
The basic means that can lack, meanwhile, any heat treatment process must can not all be violated with the basic theories of this field for foundation
Its basic theory, for different individual products, technological difficulties and the creative tool being just embodied in individual products
In the screening of body technology parameter and details.Therefore, different lamellar spacing α tissues and its grain size and its corresponding phase are obtained
Mechanical property is closed, applicant is needed to carry out a large amount of experimental study with the optimal heat treatment mode of determination, heat treatment number, heat
Treatment temperature, time and cooling rate.The present invention, which passes through, determines different cooling speed, to obtain different α tissue lamellar thickness, clump
Domain, grain size and its performance.I.e. the present invention is aerospace TC4 titanium alloy with titanium alloy, is being heated to beta transformation point or more
Temperature is cooled to room temperature with different cooling speed, and to obtain different lamellar spacing α tissues, the invention is different from the document reported,
Existing report is not directed to acquisition of the titanium alloy across scale substructure, which has found is obtained not using 10 cooling rates
With lamellar spacing α tissue and its grain size and its corresponding related mechanical property (being specifically shown in embodiment 1).
Detailed description of the invention:
Fig. 1 is the TC4 titanium alloy microstructure after 1050 DEG C of thermal deformations: (a) 0.1 DEG C/s, (c) 0.5 DEG C/s, (e) 1 DEG C/
s,(g)5℃/s, (i)10℃/s,(k)15℃/s,(m)20℃/s,(o)30℃/s,(q)50℃/s,(s)80℃/s,(b),
(r), (p), (n), (l), (k), (j), (h), (f), (d), it (t) is corresponding mirco structure；
Fig. 2 be different cooling rate under crystallite dimension: (a) 0.1 DEG C/s, (b) 0.5 DEG C/s, (c) 1 DEG C/s, (d) 5 DEG C/
s,(e)10℃/s, (f)15℃/s,(g)20℃/s,(h)30℃/s,(i)50℃/s,(j)80℃/s；
Fig. 3 be different cooling rate under clump tract tissue: (a) 0.1 DEG C/s, (b) 0.5 DEG C/s, (c) 1 DEG C/s, (d) 5 DEG C/
s,(e)10℃/s, (f)80℃/s；
Fig. 4 is the relationship of slip thickness and cooling rate.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
Embodiment 1: a kind of heat treatment method of Ti alloy with high performance different levels tissue:
Alloy used be TC4 titanium alloy, ingredient percent are as follows: Al:5.42%, V:4.29%, Fe:0.08%,
C:0.06%, Si:0.07%, Mo:0.015%, Ni:0.01%, Cr:0.004%, B:0.002%, surplus are Ti and can not
The impurity avoided.
Heat treatment method: the TC4 titanium alloy forging state bar of the above ingredient is processed into plate, is put into hot modeling test machine
In be heated to 1050 DEG C, after keeping the temperature 5min, respectively with 0.1 DEG C/s, 0.5 DEG C/s, 1 DEG C/s, 5 DEG C/s, 10 DEG C/s, 15 DEG C/s, 20
DEG C/s, 30 DEG C/s, 50 DEG C/s, 80 DEG C/s is cooled to room temperature.
To TC4 titanium alloy lamellar spacing, clump domain sizes, crystallite dimension and mechanical property progress after different cooling speed is cooling
Test: lamella and crystallite dimension measure on image pro plus, and conventional mechanical property testing experiment device therefor is
8501 testing machine of Insron, rate of extension 1mm/min, extensometer range are 25 ± 2.5mm.
The precipitation process of α phase is the process that a forming core and core are grown up, the position of forming core, nucleus quantity, growth rate with
The ingredient and cooling condition of alloy are related.When cooling rate is very slow, as shown in Figure 1, nucleus is first in crystal boundary since degree of supercooling is small
It is formed, then to transgranular growth, forms the more coarse α beam domain of slip size, furthermore cooling rate is low, can also be with grain boundary networks α
Generation.When cooling velocity is very fast, since degree of supercooling is big, nucleus can be formed in intra-die, and after forming core, α phase can be with
Form that position is consistent to transgranular growth, strip α tissue arranged in parallel can also form α boundling in intra-die, with cold
The increase of speed, α domain sizes reduce.Fig. 2 and Fig. 3 shows the crystal grain and clump domain that TC4 titanium alloy obtains after friction speed is cooling
Dimensional drawing, it can be seen that with the increase of cooling velocity, the crystal grain and clump domain sizes of material all slightly reduce.
From the data in table 1 and Fig. 4 it can be seen that with cooling rate increase, lamellar spacing gradually subtracts in tissue
It is small.When cooling rate is slower, lamellar spacing is larger with cooling rate reduction amplitude of variation, curve steeper.When cooling rate compared with
When big, lamellar spacing is smaller with cooling rate reduction amplitude of variation.From fig. 4, it can be seen that after 20 DEG C/s, curve approximation
For straight straight line.Thus, it will be seen that lamellar spacing is to the sensitivity of cooling rate than rapid cooling item when slow cooling
It is high under part.
Table 1 TC4 titanium alloy lamellar spacing, clump domain sizes and crystallite dimension after different cooling speed is cooling
It can be seen that the reduction with lamellar spacing from the data in table 2, tensile strength and yield strength gradually increase.?
When cooling rate is 5 DEG C/s to 15 DEG C/s, less, this may be with the mesh basket tissue of the knitting shape of generation for the tensile strength variation of material
It is related, at this moment cause the factor of Strength Changes may be also related with phase mehtod with the form of α phase, this is the group changed greatly
Knit feature.Later, with the further refinement of lamella, intensity continues to increase.With the reduction of lamellar spacing, the contraction percentage of area
Downward trend is integrally presented with elongation.The reason of plasticity reduces is the increase with cooling rate, and the β phase between obtained synusia contains
Amount reduce and β phase is body-centered cubic, slip system is more, dislocation easy movement and make stress relaxation, plasticity improve.Another reason
It is because cooling rate increases, a part of structural transformation is the supersaturated solid solution α phase with hexagoinal lattice, although in titanium alloy
The ratio tolerance of two-phase is only 0.17%, but can also generate small part internal stress, declines plasticity.2 Mechanics Performance Testing of table
As a result
Claims (4)
1. a kind of heat treatment method for obtaining Ti alloy with high performance different levels tissue, it is characterised in that: biphase titanium alloy is forged
State bar is processed into plate, is heat-treated using hot modeling test machine.
2. obtaining the heat treatment method of Ti alloy with high performance different levels tissue as described in claim 1, it is characterised in that: institute
The heat treatment stated is；Biphase titanium alloy sample is heated to 1000-1100 DEG C, is kept the temperature after 3-8min respectively with 0.1 DEG C/s, 0.5
DEG C/s, 1 DEG C/s, 5 DEG C/s, 10 DEG C/s, 15 DEG C/s, 20 DEG C/s, 30 DEG C/s, 50 DEG C/s, 80 DEG C/s is cooled to room temperature.
3. obtaining the heat treatment method of Ti alloy with high performance different levels tissue as claimed in claim 1 or 2, feature exists
In: the titanium alloy is TC4 titanium alloy.
4. obtaining the heat treatment method of Ti alloy with high performance different levels tissue as claimed in claim 3, it is characterised in that: institute
The ingredient percent for the TC4 titanium alloy stated are as follows: Al:5.42%；V:4.29%；Fe:0.08%；C:0.06%；Si:
0.07%；Mo:0.015%；Ni:0.01%；Cr:0.004% and B 0.002%, surplus are Ti and inevitable impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111036810A (en) * | 2019-12-11 | 2020-04-21 | 贵州航宇科技发展股份有限公司 | High-temperature alloy forging and heat treatment method |
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| CN104745995A (en) * | 2013-12-31 | 2015-07-01 | 贵州大学 | Thinning process method of TC4 titanium alloy multilevel tissues |
| CN107779801A (en) * | 2017-11-02 | 2018-03-09 | 中国兵器科学研究院宁波分院 | The heat treatment method of armoring titanium alloy TC 4 |
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| CN104745995A (en) * | 2013-12-31 | 2015-07-01 | 贵州大学 | Thinning process method of TC4 titanium alloy multilevel tissues |
| CN103924180A (en) * | 2014-04-08 | 2014-07-16 | 中南大学 | Thermal treatment method for TC18 titanium alloy |
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| CN111036810A (en) * | 2019-12-11 | 2020-04-21 | 贵州航宇科技发展股份有限公司 | High-temperature alloy forging and heat treatment method |
| CN111036810B (en) * | 2019-12-11 | 2022-05-13 | 贵州航宇科技发展股份有限公司 | High-temperature alloy forging and heat treatment method |
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Application publication date: 20190322 |