CN114703395B - Heat treatment process of TC25 alloy castings - Google Patents
Heat treatment process of TC25 alloy castings Download PDFInfo
- Publication number
- CN114703395B CN114703395B CN202210370253.2A CN202210370253A CN114703395B CN 114703395 B CN114703395 B CN 114703395B CN 202210370253 A CN202210370253 A CN 202210370253A CN 114703395 B CN114703395 B CN 114703395B
- Authority
- CN
- China
- Prior art keywords
- temperature
- alloy
- heat preservation
- casting
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a heat treatment process of a TC25 alloy casting, which comprises the following steps: step 1): heating the alloy to a transformation point T β The temperature is 3-5℃ (T) 1 ) Heat preservation is carried out, and the heat preservation time is t 1 . Step 2): the casting is cooled by a furnace from T 1 Down to T 2 And continue to keep warm for a period of time t 2 . Then continue furnace cooling to T 3 The heat preservation time is t 3 … …, and so on. Step 3): furnace cooling the castings to T m And after heat preservation for 60-120 min, the temperature is raised to T n And preserving the temperature for 60-120 min, directly discharging from the furnace and cooling to room temperature. Wherein T is m 、T n (n=1, 2,3 … …) is a holding temperature, and is required to satisfy T 1 ＞T 2 ＞T 3 ＞…＞T n ＞…＞T m The method comprises the steps of carrying out a first treatment on the surface of the And adjacent temperature interval is not more than 5 ℃, T m 、T n Are all at a temperature below the phase transition point, wherein T m The temperature is 30-40 ℃ below the beta transition temperature and is less than or equal to 5 ℃ and less than or equal to T n ‑T m ≤10℃；t i (i=1, 2,3 … …) is the heat preservation time, and 30min is less than or equal to t i And less than or equal to 90min. The final casting structure is a double-state structure, and the room temperature extensibility of the final casting structure is improved by more than 50 percent compared with that of the original structure.
Description
Technical Field
The invention belongs to the technical field of titanium alloy, and particularly relates to a heat treatment process of a TC25 alloy casting.
Background
The TC25 alloy is a high-temperature titanium alloy developed according to BT25 titanium alloy developed by the Su's company in the 70 th century, the nominal component of the TC25 alloy is Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si, and the TC25 alloy belongs to alpha+beta titanium alloy, and as the alloy is added with W, mo elements with high melting point, the TC25 alloy has high heat resistance and heat stability. The TC25 alloy has good room temperature performance, high-temperature strength fracture toughness and other mechanical properties, and excellent comprehensive performance, so that the TC25 alloy is widely applied to hot end components such as compressor discs, fan blades and the like of aeroengines.
Along with the development of precision investment casting and hot isostatic pressing technology, the development of TC25 titanium alloy castings becomes possible, but TC25 titanium alloy casting structures are coarse lamellar structures, plasticity is poor, and the casting structures are required to be regulated and controlled through heat treatment because the casting cannot be improved through deformation, and the traditional TC25 alloy heat treatment process is double annealing, so that the regulation of the casting structures and performances is difficult to realize.
Disclosure of Invention
The invention aims at solving the problems of difficult regulation and control of a TC25 titanium alloy casting structure, poor plasticity and the like; in order to solve the technical problems, the invention provides a heat treatment process of a TC25 alloy casting by combining the phase change characteristic of the TC25 alloy, which comprises the following specific scheme:
a heat treatment process of a TC25 alloy casting, comprising the steps of:
step one: heating the alloy to a transformation point T β The temperature is 3-5℃ (T) 1 ) Heat preservation is carried out, and the heat preservation time is t 1 ；
Step two: the casting is cooled by a furnace from T 1 Down to T 2 And continue to keep warm for a period of time t 2 . Then continue furnace cooling to T 3 The heat preservation time is t 3 … …, and so on;
step three: furnace cooling the castings to T m And after heat preservation for 60-120 min, the temperature is raised to T n And preserving the temperature for 60-120 min, directly discharging from the furnace and air cooling to room temperature;
wherein T is m 、T n (n=1, 2,3 … …) is a holding temperature, and is required to satisfy T 1 ＞T 2 ＞T 3 ＞…＞T n ＞…＞T m The method comprises the steps of carrying out a first treatment on the surface of the And the adjacent temperature interval is not more than 3 ℃, T m 、T n Are all at a temperature below the phase transition point, wherein T m The temperature is 30-40 ℃ below the beta transition temperature and is less than or equal to 5 ℃ and less than or equal to T n -T m ≤10℃；t i (i=1, 2,3 … …) is the heat preservation time, and 30min is less than or equal to t i ≤90min。
According to the heat treatment process of the TC25 alloy casting, the optimal scheme is that the final structure of the TC25 alloy casting is a double-state structure, and the room temperature strength of the TC25 alloy casting can reach 1050MPa.
The optimal scheme of the heat treatment process of the TC25 alloy casting is that the furnace cooling rate in the step 2) is controlled to be 0.5-1 ℃ per minute.
The invention has the beneficial effects that:
the invention provides a heat treatment process of a TC25 titanium alloy casting, which can effectively improve the room temperature plasticity of the TC25 titanium alloy casting and can also effectively improve the performance stability of the alloy while ensuring the room temperature strength of the alloy. The final structure of the casting is a double-state structure, and the room temperature elongation rate of the casting is improved by more than 50% compared with that of the original structure, so that good matching of strong plasticity is realized, and the comprehensive mechanical property of the alloy is improved.
Drawings
FIG. 1 is a cast structure of TC25 alloy after heat treatment in example 1 of the present invention;
FIG. 2 shows the structure of a TC25 alloy casting after heat treatment in example 2 of the present invention.
Detailed Description
The present invention is described in detail below with reference to the following examples, which are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but not to be taken as a limiting basis, and all equivalent changes and modifications made according to the spirit of the present invention shall be covered by the protection scope of the present invention.
Example 1:
the material used in the embodiment is TC25 alloy casting rod with the specification of phi 25mm multiplied by 200mm, the composition of the casting rod is Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si, and the alloy phase transition point is 990 ℃;
1) Firstly, heating a TC25 casting rod to 985 ℃ and preserving heat for 60min;
2) The casting bar was cooled to 982 ℃ in a furnace cold mode and kept warm for a further 60min. Continuously furnace-cooling to 979 ℃ and preserving heat for 60min; continuously furnace-cooling to 976 ℃ and preserving heat for 60min; continuously furnace-cooling to 973 ℃ and preserving heat for 60min; continuously furnace cooling to 970 ℃ and preserving heat for 60min; continuously furnace cooling to 967 ℃ and preserving heat for 60min; continuously furnace cooling to 964 ℃ and preserving heat for 60min; continuously furnace cooling to 961 and preserving heat for 60min; continuously furnace cooling to 958 ℃ and preserving heat for 120min. Continuously furnace cooling to 955 ℃ and preserving heat for 120min, and continuously furnace cooling to 952 ℃ and preserving heat for 120min;
3) And heating the casting rod to 960 ℃, preserving heat for 120min, and finally discharging the casting rod for air cooling to room temperature.
Table 1 shows the mechanical property test results of the castings of the examples after heat treatment and the comparison with the original castings (comparison casting I) and the castings of the traditional process (comparison casting II), and as can be seen from Table 1, the room temperature tensile strength average value of the castings of the examples 1 reaches 1077MPa, which is higher than that of the original castings; the average value of the room temperature elongation reaches 8.75 percent, and the room temperature elongation is improved by about 70 percent compared with the original casting and the traditional process. Meanwhile, the stability of the mechanical properties of the castings of the embodiment can be seen due to the comparison castings.
Table 1 room temperature tensile properties of TC25 cast bars
Example 2:
the material used in the embodiment is TC25 alloy casting barreled material with specification of phi 450mm multiplied by phi 430 mm multiplied by 600mm, the composition is Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si, and the alloy phase change point is 990 ℃;
1) Firstly, heating a TC25 casting rod to 985 ℃ and preserving heat for 60min;
2) Cooling the casting rod to 982 ℃ in a furnace cooling mode, and continuously preserving heat for 60min; continuously furnace-cooling to 979 ℃ and preserving heat for 60min; continuously furnace-cooling to 976 ℃ and preserving heat for 60min; continuously furnace-cooling to 973 ℃ and preserving heat for 60min; continuously furnace cooling to 970 ℃ and preserving heat for 60min; continuously furnace cooling to 967 ℃ and preserving heat for 90min; continuously furnace cooling to 964 ℃ and preserving heat for 90min; continuously furnace cooling to 961 and preserving heat for 90min; continuously furnace cooling to 958 ℃ and preserving heat for 120min; continuously furnace cooling to 955 ℃ and preserving heat for 120min; continuously furnace cooling to 952 ℃ and preserving heat for 120min; continuously furnace cooling to 950 ℃ and preserving heat for 120min;
3) Finally, the temperature is raised to 960 ℃ and kept for 120min, and then the furnace is taken out for air cooling.
Table 2 shows that the tensile strength of the casting rod of example 1 is 1074MPa, the elongation average value is 8.5%, and the mechanical property is more stable than that of the casting rod before heat treatment and under the traditional process.
Table 2 room temperature tensile properties of castings
Claims (3)
1. A heat treatment process of a TC25 alloy casting is characterized by comprising the following steps of: comprises the following steps:
step one: heating the TC25 alloy casting to T 1 Heat preservation is carried out, and the heat preservation time is t 1 ；
Step two: casting TC25 alloy from T in a furnace cooling mode 1 Down to T 2 And continue to keep warm for a period of time t 2 The method comprises the steps of carrying out a first treatment on the surface of the Then continue furnace cooling to T 3 The heat preservation time is t 3 … …, and so on;
step three: furnace cooling of TC25 alloy castings to T m And after heat preservation for 60-120 min, the temperature is raised to T n And preserving the temperature for 60-120 min, directly discharging from the furnace and air cooling to room temperature;
wherein T is m 、T n To keep the temperature, the requirement of T is satisfied β ＞T 1 ＞T 2 ＞T 3 ＞…＞T n ＞…＞T m The method comprises the steps of carrying out a first treatment on the surface of the And T is 1 At T β The temperature is 3-5 ℃ below, other adjacent temperature intervals are not more than 3 ℃, wherein T is m The temperature is 30-40 ℃ below the beta transition temperature and is less than or equal to 5 ℃ and less than or equal to T n -T m ≤10℃；t i The heat preservation time is not more than 30min and not more than t i ≤90min。
2. The heat treatment process for a TC25 alloy casting according to claim 1, wherein: the final structure of the TC25 alloy casting is a double-state structure, and the room temperature strength of the TC25 alloy casting can reach 1050MPa.
3. The heat treatment process for a TC25 alloy casting according to claim 1, wherein: the furnace cooling rate in the step 2) is controlled to be 0.5-1 ℃ per minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210370253.2A CN114703395B (en) | 2022-04-09 | 2022-04-09 | Heat treatment process of TC25 alloy castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210370253.2A CN114703395B (en) | 2022-04-09 | 2022-04-09 | Heat treatment process of TC25 alloy castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114703395A CN114703395A (en) | 2022-07-05 |
| CN114703395B true CN114703395B (en) | 2023-05-12 |
Family
ID=82173008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210370253.2A Active CN114703395B (en) | 2022-04-09 | 2022-04-09 | Heat treatment process of TC25 alloy castings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114703395B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085555B (en) * | 2010-12-10 | 2012-11-28 | 贵州航宇科技发展股份有限公司 | Roll forming method of TC25 titanium alloy thin-walled ring forging |
| CN102230145B (en) * | 2011-06-20 | 2012-07-04 | 西部钛业有限责任公司 | Method for producing TC25 two-phase titanium alloy rod material with large specification |
| CN103111557B (en) * | 2012-12-12 | 2014-11-05 | 贵州航宇科技发展股份有限公司 | Method for rolling and forming TC25 high-temperature alloy complicated irregular cross section annular part |
| CN103522007B (en) * | 2013-09-26 | 2017-01-18 | 贵州航宇科技发展股份有限公司 | Method for manufacturing TC25 titanium alloy ring piece |
| CN103668027A (en) * | 2013-12-15 | 2014-03-26 | 无锡透平叶片有限公司 | Quasi beta forging process for TC25 titanium alloy |
| CN111575510A (en) * | 2020-05-18 | 2020-08-25 | 西部超导材料科技股份有限公司 | Method for preparing TC25 titanium alloy ingot and ingot prepared by method |
| CN112708839A (en) * | 2020-12-18 | 2021-04-27 | 陕西宏远航空锻造有限责任公司 | Heat treatment method of TC25 alloy forging |
| CN112828222A (en) * | 2020-12-30 | 2021-05-25 | 西安西工大超晶科技发展有限责任公司 | Preparation method of multi-component titanium alloy forging |
-
2022
- 2022-04-09 CN CN202210370253.2A patent/CN114703395B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114703395A (en) | 2022-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107287468B (en) | A kind of Cu alloy material and preparation method thereof that high-strength highly-conductive is heat-resisting | |
| JP2606023B2 (en) | Method for producing high strength and high toughness α + β type titanium alloy | |
| CN110923598A (en) | Heat treatment process for improving toughness of nearly β type or metastable β type titanium alloy | |
| CN110586828B (en) | Free forging method of Ti662 titanium alloy large-size bar | |
| CN114703395B (en) | Heat treatment process of TC25 alloy castings | |
| CN108660399B (en) | B2+ O/α obtained by pre-deforming Ti-22Al-25Nb alloy2Method for multi-morphological stabilization of tissue | |
| CN108385045B (en) | Heat treatment method for controlling uniform delta phase precipitation of IN718 alloy | |
| CN110158004A (en) | A kind of diphasic titanium alloy thermomechanical treatment process obtaining uniformly tiny bifurcation tissue | |
| CN111647835B (en) | Method for improving mechanical heat treatment of beta-type titanium alloy | |
| CN113817971A (en) | Heat treatment method of NbMoTaW series refractory high-entropy alloy | |
| CN114790533B (en) | Heat treatment process of TC11 titanium alloy castings | |
| CN114774816B (en) | Heat treatment process of TC25G titanium alloy casting | |
| CN114774817B (en) | Heat treatment process of Ti6246 alloy castings | |
| CN113817972B (en) | Method for arbitrarily adjusting equiaxial alpha phase content in titanium alloy through heat treatment | |
| CN115029641A (en) | Fixed expansion alloy plate with good plasticity and preparation method thereof | |
| CN110079753A (en) | A kind of forging method for eliminating TiAl alloy remnants lamella | |
| JP3409278B2 (en) | High strength, high ductility, high toughness titanium alloy member and its manufacturing method | |
| CN112725712B (en) | Selective laser melting of Ti2Heat treatment method of AlNb-based alloy and product prepared by heat treatment method | |
| JPS63230858A (en) | Manufacture of titanium-alloy sheet for superplastic working | |
| CN111719039B (en) | FeCoNiAlNb high-temperature alloy homogenization treatment method | |
| CN114703435B (en) | Heat treatment process of Ti60 alloy castings | |
| CN115261671B (en) | High-temperature titanium alloy with heat resistance and heat processing method thereof | |
| CN103820710B (en) | A kind of large-scale integrated circuit manufacturing equipment Invar alloy and preparation method thereof | |
| CN114774818B (en) | Heat treatment process for improving Ti65 alloy casting structure | |
| CN114672694B (en) | Preparation method of near-alpha type high-temperature titanium alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |