CN114107858A - Titanium alloy with good matching of strength and toughness and processing method thereof - Google Patents
Titanium alloy with good matching of strength and toughness and processing method thereof Download PDFInfo
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- CN114107858A CN114107858A CN202111453054.XA CN202111453054A CN114107858A CN 114107858 A CN114107858 A CN 114107858A CN 202111453054 A CN202111453054 A CN 202111453054A CN 114107858 A CN114107858 A CN 114107858A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 23
- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 62
- 239000000956 alloy Substances 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims description 29
- 238000005242 forging Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- 238000004663 powder metallurgy Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- XOJVVFBFDXDTEG-UHFFFAOYSA-N Norphytane Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 28
- 229910001040 Beta-titanium Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- 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
Abstract
The invention discloses a titanium alloy with good matching of strength and toughness and a processing method thereof, belonging to the field of optimized titanium alloy. The processing method of the titanium alloy with good matching of strength and toughness has the advantages of low heat treatment temperature, one-time heat treatment, short treatment time and only 1 hour. The short-time heat treatment of the invention can adjust the microstructure of the alloy and improve the matching of the strength and the toughness of the alloy. The titanium alloy with well matched strength and toughness obtains a heterogeneous layered multilevel structure through one-time short-time simple heat treatment.
Description
Technical Field
The invention belongs to the field of optimized titanium alloy, and particularly relates to a titanium alloy with good matching of strength and toughness and a processing method thereof.
Background
The titanium alloy is used as a novel light metal material which is rapidly developed in recent 20 years, has excellent comprehensive properties of strength, modulus, weldability, corrosion resistance, biocompatibility and the like, and becomes a main structural material of modern aviation airplanes, aeroengines, spaceflight, ships and the like. With the development of airplanes, engines, aerospace and the like, not only the strength level of the titanium alloy is required to be continuously improved, but also the toughness of the alloy is required to be kept at a certain level, namely the strength and the toughness are required to be well matched.
In recent years, to achieve the strength of titanium alloys1300MPa or more, and fracture toughness higher than 50MPa m1/2The methods mainly used include designing new near-beta titanium alloy components, repeated upsetting-drawing forging, multiple heat treatment, etc., and although these methods have some effects, they are high in cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a titanium alloy with good matching of strength and toughness and a processing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a processing method of a titanium alloy with good matching of strength and toughness comprises the following steps:
preparing an alloy ingot close to beta, upsetting, drawing, cogging and forging the alloy ingot, and rolling the alloy ingot into an alloy bar;
the alloy cast ingot comprises the following components in parts by weight:
Ti-5Al-5Mo-5V-3Cr-(0.34～0.37)O；
and secondly, preserving the heat of the alloy bar for 1h at the temperature of 600-700 ℃, and then air-cooling to room temperature.
Further, the near-beta alloy ingot in the step one is prepared by a powder metallurgy method.
Further, in the first step, the alloy bar is an alloy bar with the diameter of 11.5 mm.
The titanium alloy with good matching of strength and toughness is processed according to the processing method provided by the invention.
Further, tensile strength Rm1325-1700MPa, yield strength Rp0.21275-1639.7MPa, and fracture toughness KqIs 52.9-62.1 MPa.m1/2。
Furthermore, the tissue is heterogeneous layered multilevel tissue.
Furthermore, a large amount of blocky primary alpha phases are gathered on the original beta crystal boundary;
primary alpha phases are distributed in primary beta phase crystals, and meanwhile, a large number of micron-sized small flaky crossed secondary alpha phases are distributed in the beta phase crystals;
the secondary alpha phase has a beta-transus tissue distributed in its interstitial space.
Further, the blocky primary alpha phase is distributed in a strip shape;
the secondary alpha-phase cluster domains are distributed in multiple directions.
Compared with the prior art, the invention has the following beneficial effects:
the processing method of the titanium alloy with good matching of strength and toughness has the advantages of low heat treatment temperature, one-time heat treatment, short treatment time of only 1h, obviously reduced cost compared with the commonly used heat treatment process of high-temperature solid solution and aging, and capability of meeting the good matching of high strength and toughness. The short-time heat treatment of the invention can adjust the microstructure of the alloy and improve the matching of the strength and the toughness of the alloy.
The titanium alloy with good matching of strength and toughness of the invention obtains a heterogeneous layered multilevel structure through one-time short-time simple heat treatment: a large amount of blocky primary alpha phases are gathered on the original beta crystal boundary and distributed in a strip shape along the direction vertical to the deformation direction; a small amount of primary alpha phase is also arranged in the primary beta phase crystal, meanwhile, a large amount of micron-sized tiny flaky crossed secondary alpha phase is arranged in the beta phase crystal, and the intragranular secondary alpha phase cluster domains are distributed in multiple directions; meanwhile, beta transformation tissues are distributed in the gaps of the secondary alpha phase. The special structure enables the alloy to have high strength and toughness matching.
Drawings
FIG. 1 is a view showing the structure of a microstructure in example 1 of the present invention.
FIG. 2 is a view showing the structure of a microstructure according to example 2 of the present invention.
FIG. 3 is a view showing the structure of a microstructure according to example 3 of the present invention.
FIG. 4 is a view showing the structure of a microstructure according to example 4 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.36O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
and step two, heating and insulating the alloy bar at 600 ℃ for 1h, and then air-cooling to room temperature to obtain a microstructure shown in figure 1.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.36O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1700MPa, yield strength Rp0.21639.7MPa, fracture toughness Kq＝53.2MPa·m1/2。
Example 2
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.36O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
step two, heating and insulating the alloy bar at 630 ℃ for 1h, and then air-cooling to room temperature to obtain a microstructure shown in FIG. 2.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.36O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1594MPa, yield strength Rp0.21534MPa, fracture toughness Kq＝52.9MPa·m1/2。
Example 3
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.36O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
step two, heating and insulating the alloy bar at 660 ℃ for 1h, and then air-cooling to room temperature to obtain a microstructure shown in figure 3.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.36O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1490MPa, yield strength Rp0.21422MPa, fracture toughness Kq＝55.2MPa·m1/2。
Example 4
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.36O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
step two, heating the alloy bar at 700 ℃ and preserving heat for 1h, then air-cooling to room temperature, and obtaining a microstructure shown in figure 4.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.36O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1355MPa, yield strength Rp0.21295MPa, fracture toughness Kq＝60.1MPa·m1/2。
Example 5
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.34O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
and step two, heating the alloy bar at 700 ℃ and preserving heat for 1h, and then air-cooling to room temperature.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.34O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1325MPa, yield strength Rp0.21275MPa, fracture toughness Kq＝62.1MPa·m1/2。
Example 6
The heat treatment process for obtaining the near-beta titanium alloy with well-matched strength and toughness comprises the following steps of:
preparing a near-beta Ti-5Al-5Mo-5V-3Cr-0.37O (weight percentage) alloy ingot by adopting a powder metallurgy method, upsetting, cogging and forging the alloy ingot, and rolling the alloy ingot into a bar with the diameter of 11.5 mm;
and step two, heating the alloy bar at 700 ℃ and preserving heat for 1h, and then air-cooling to room temperature.
The near-beta Ti-5Al-5Mo-5V-3Cr-0.37O alloy after the heat treatment of the process has good matching of high strength and high toughness, and the room temperature tensile mechanical property test result is as follows: tensile strength Rm1363MPa, yield strength Rp0.21305MPa, fracture toughness Kq＝59.0MPa·m1/2。
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A processing method of a titanium alloy with good matching of strength and toughness is characterized by comprising the following steps:
preparing an alloy ingot close to beta, upsetting, drawing, cogging and forging the alloy ingot, and rolling the alloy ingot into an alloy bar;
the alloy cast ingot comprises the following components in parts by weight:
Ti-5Al-5Mo-5V-3Cr-(0.34～0.37)O；
and secondly, preserving the heat of the alloy bar for 1h at the temperature of 600-700 ℃, and then air-cooling to room temperature.
2. The method of claim 1, wherein the near- β alloy ingot of step one is produced by a powder metallurgy process.
3. The method for processing the titanium alloy with the good matching of the strength and the toughness as claimed in claim 1, wherein in the first step, the alloy bar is an alloy bar with a diameter of 11.5 mm.
4. A titanium alloy having a good match between strength and toughness, characterized in that it is processed by the processing method according to any one of claims 1 to 3.
5. The titanium alloy of claim 4, wherein said alloy has a tensile strength Rm1325-1700MPa, yield strength Rp0.21275-1639.7MPa, and fracture toughness KqIs 52.9-62.1 MPa.m1/2。
6. The titanium alloy having good matching strength and toughness of claim 4, wherein said titanium alloy is a heterogeneous layered multilevel structure.
7. The titanium alloy of claim 6, wherein a substantial amount of bulk primary alpha phase is agglomerated to pristine beta grain boundaries;
primary alpha phases are distributed in primary beta phase crystals, and meanwhile, a large number of micron-sized small flaky crossed secondary alpha phases are distributed in the beta phase crystals;
the secondary alpha phase has a beta-transus tissue distributed in its interstitial space.
8. The well-matched strength and toughness titanium alloy of claim 7 wherein said bulk primary alpha phase is distributed in the form of stripes;
the secondary alpha-phase cluster domains are distributed in multiple directions.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01202389A (en) * | 1988-02-05 | 1989-08-15 | Hitachi Ltd | Manufacture of steam turbine long blade |
| CN106947928A (en) * | 2016-01-06 | 2017-07-14 | 天津皕劼同创精密钛铸造有限公司 | A kind of strenthen-toughening mechanizm technique of Ti12LC titanium alloys |
| CN108559935A (en) * | 2018-07-05 | 2018-09-21 | 长沙理工大学 | A kind of quick composite heat treating process improving titanium alloy mechanical property |
| CN109234656A (en) * | 2018-11-08 | 2019-01-18 | 江苏理工学院 | A kind of predeformation heat treatment process improving metastable β Titanium-alloy intensity |
| CN112391558A (en) * | 2020-11-25 | 2021-02-23 | 长安大学 | Near-beta type titanium alloy with good matching between strength and plasticity and preparation method thereof |
-
2021
- 2021-11-30 CN CN202111453054.XA patent/CN114107858A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01202389A (en) * | 1988-02-05 | 1989-08-15 | Hitachi Ltd | Manufacture of steam turbine long blade |
| CN106947928A (en) * | 2016-01-06 | 2017-07-14 | 天津皕劼同创精密钛铸造有限公司 | A kind of strenthen-toughening mechanizm technique of Ti12LC titanium alloys |
| CN108559935A (en) * | 2018-07-05 | 2018-09-21 | 长沙理工大学 | A kind of quick composite heat treating process improving titanium alloy mechanical property |
| CN109234656A (en) * | 2018-11-08 | 2019-01-18 | 江苏理工学院 | A kind of predeformation heat treatment process improving metastable β Titanium-alloy intensity |
| CN112391558A (en) * | 2020-11-25 | 2021-02-23 | 长安大学 | Near-beta type titanium alloy with good matching between strength and plasticity and preparation method thereof |
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