CN107723510B - High-strength and high-plasticity β titanium alloy with TRIP/TWIP effect and preparation method thereof - Google Patents
High-strength and high-plasticity β titanium alloy with TRIP/TWIP effect and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength high-plasticity β titanium alloy with TRIP/TWIP effect, which mainly comprises the following components, by mass, 10% -14% of Mo, 1% -10% of Zr, or 10% -14% of Mo, 1% -5% of Sn, or 10% -14% of Mo, 0.5% -1.5% of Fe, or 10% -14% of Mo, 1% -10% of Zr, 1% -5% of Sn, 0.5% -1.5% of Fe, and the balance of Ti and inevitable impurities.
Description
Technical Field
The invention relates to the field of titanium alloy, in particular to high-strength high-plasticity metastable β (beta) titanium alloy with TRIP/TWIP effect.
Background
The titanium alloy has low density, high specific strength, high specific modulus, good low-temperature performance, good corrosion resistance, no magnetism, good biocompatibility and other excellent comprehensive properties, and is widely applied to various national economic fields such as aerospace, automobiles, petrochemical engineering, medical instruments and the like, wherein β (beta) titanium alloy is the most widely used titanium alloy at present, for example, β titanium alloy Ti-15Mo-2.6Nb-3Al-0.2Si (β -21S), Ti-10V-2Fe-3Al (Ti-1023), Ti-5Al-5V-5Mo-1Cr-1Fe (BT22), Ti-15V-3Cr-3Sn-3Al (Ti-153) and other materials such as partial aluminum alloy and high-strength steel are used for high-strength structures such as β titanium alloy, connecting joints, wing beam fasteners, reinforcing frames/beams, joints, engine supports, landing gears and other parts such as wing spars, connecting joints, reinforcing frames/beams, lugs, engine supports, landing gears and the like.
Although the currently commonly used structural titanium alloys have higher strength, such as β -21S, Ti-153 titanium alloys, β -C, BT22 titanium alloys, the strength level is 1100-1250 MPa, and the fracture toughness KIC is 45-60 MPa, compared with stainless steel or Co-Cr alloys, the titanium alloys have two obvious defects of low plasticity and poor work hardening capacity, for example, the uniform plastic deformation capacity (epsilon) of the titanium alloys is generally lower than 25%, and the average work hardening interval is about 80 MPa.
Disclosure of Invention
In order to overcome the defects of low plasticity and poor work hardening behavior of the titanium alloy for the existing structure, the invention provides a high-strength high-plasticity β titanium alloy with TRIP/TWIP effect and a preparation method thereof, and the Ti-Mo-based metastable β titanium alloy with TRIP/TWIP effect, high strength, high plasticity and good work hardening capacity is obtained.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-strength high-plasticity β titanium alloy with a TRIP/TWIP effect mainly comprises, by mass, 10-14% of Mo, 1-10% of Zr, and the balance of Ti and inevitable impurities.
Preferably, the composition comprises the following components in percentage by weight: 12% of Mo, 5% of Zr, and the balance of Ti and inevitable impurities.
Further, the feed also comprises the following components in percentage by mass: 0.5 to 1.5 percent of Fe or 1 to 5 percent of Sn.
Preferably, the composition comprises the following components in percentage by weight: 12% of Mo, 5% of Zr, 3% of Sn, and the balance of Ti and inevitable impurities.
A high-strength high-plasticity β titanium alloy with TRIP/TWIP effect mainly comprises, by mass, 10-14% of Mo, 1-5% of Sn, and the balance of Ti and unavoidable impurities.
Preferably, the composition comprises the following components in percentage by weight: 12% of Mo, 5% of Sn, and the balance of Ti and inevitable impurities.
Further, the feed also comprises the following components in percentage by mass: 0.5 to 1.5 percent of Fe.
A high-strength high-plasticity β titanium alloy with TRIP/TWIP effect mainly comprises the following components, by mass, 10-14% of Mo, 0.5-1.5% of Fe, and the balance of Ti and inevitable impurities.
Preferably, the composition comprises the following components in percentage by weight: 10% of Mo, 1.0% of Fe, and the balance of Ti and inevitable impurities.
A high-strength high-plasticity β titanium alloy with TRIP/TWIP effect mainly comprises, by mass, 10-14% of Mo, 1-10% of Zr, 1-5% of Sn, 0.5-1.5% of Fe, and the balance of Ti and inevitable impurities.
According to the invention, the Ti-Mo-based high-strength high-plasticity beta titanium alloy with TRIP/TWIP effect is prepared by regulating β stability of the beta titanium alloy, so that TRIP and TWIP effects (TRIP: transformation induced plastic deformation, TWIP: twin crystal induced plastic deformation) are generated simultaneously in the plastic deformation process at room temperature, excellent comprehensive mechanical properties (shown in figure 1) such as excellent plasticity (uniform plastic deformation capacity epsilon is more than or equal to 30 percent), higher strength (tensile strength UTS: 900-1200 MPa), good work hardening behavior (work hardening interval is more than 200MPa) and excellent cold working property (cold rolling deformation rate is more than or equal to 95 percent) are shown, compared with Ti-6Al-4V alloy (annealing state), the series of Ti-Mo-based titanium alloy has yield strength which is 4 times that of Ti-6Al-4V alloy although the yield strength is lower than that of Ti-6Al-4V alloy, and compared with 'Gum alloy', the designed alloy has better yield strength and better economic strength and better than that of Ti-6Al-4V alloy, and the Mn-alloy has excellent social benefit of 8%, and the economic benefit of improving the social benefit of the series of Ti-Mo-based titanium alloy and the Mn-alloy is higher than that of the alloy, thereby the steel, and the economic benefit of the steel.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a true stress-strain curve of some typical Ti-Mo based TRIP/TWIP titanium alloys of the present invention.
FIGS. 2(a) - (e) are the true stress strain curve and work hardening rate curve for Ti-Mo based TRIP/TWIP titanium alloys of different compositions of the present invention.
FIG. 3 is an XRD pattern of the Ti-12Mo-5Zr alloy before and after deformation.
FIG. 4 is an EBSD map of Ti-12Mo alloy at a deformation ε of 0.015, where (a) is the constraint mapping; (b) is invert pole configuration.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Example 1:
firstly, weighing the following components: according to the weight percentage of each element, 12% of Mo is formed, and the balance of Ti and inevitable impurities, sponge titanium, high-purity molybdenum and pure zirconium are respectively weighed as raw materials; secondly, preparing a monolithic electrode: preparing the raw materials of the step one into a single electrode; thirdly, preparing a consumable electrode: assembling and welding the single electrode prepared in the step two into a consumable electrode in a vacuum welding box; fourthly, preparing an ingot: carrying out three times of smelting on the consumable electrode prepared in the step three in a vacuum consumable electric arc furnace to prepare an ingot; fifthly, preparing a cold-rolled sample: cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching; sixthly, cold rolling and solution treatment: and (4) repeatedly cold-rolling the cold-rolled sample prepared in the fifth step to the required size in a double-roller cold-rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the Ti-12Mo (wt.%) titanium alloy.
Example 2:
firstly, weighing the following components: according to the weight percentage of each element, 12% of Mo, 5% of Zr, the balance of Ti and inevitable impurities, sponge titanium, high-purity molybdenum and pure zirconium are respectively weighed as raw materials; secondly, preparing a monolithic electrode: preparing the raw materials of the step one into a single electrode; thirdly, preparing a consumable electrode: assembling and welding the single electrode prepared in the step two into a consumable electrode in a vacuum welding box; fourthly, preparing an ingot: carrying out three times of smelting on the consumable electrode prepared in the step three in a vacuum consumable electric arc furnace to prepare an ingot; fifthly, preparing a cold-rolled sample: cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching; sixthly, cold rolling and solution treatment: and (4) repeatedly cold-rolling the cold-rolled sample prepared in the fifth step to the required size in a double-roller cold-rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the Ti-12Mo-5Zr (wt.%) titanium alloy.
Example 3:
firstly, weighing the following components: according to the weight percentage of each element, 12% of Mo, 5% of Sn, the balance of Ti and inevitable impurities, sponge titanium, high-purity molybdenum and pure tin are respectively weighed as raw materials; secondly, preparing a monolithic electrode: preparing the raw materials of the step one into a single electrode; thirdly, preparing a consumable electrode: assembling and welding the single electrode prepared in the step two into a consumable electrode in a vacuum welding box; fourthly, preparing an ingot: carrying out three times of smelting on the consumable electrode prepared in the step three in a vacuum consumable electric arc furnace to prepare an ingot; fifthly, preparing a cold-rolled sample: cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching; sixthly, cold rolling and solution treatment: and (4) repeatedly cold-rolling the cold-rolled sample prepared in the fifth step to the required size in a double-roller cold-rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the Ti-12Mo-5Sn (wt.%) titanium alloy.
Example 4:
firstly, weighing the following components: according to the weight percentage of each element, 12% of Mo, 5% of Sn, the balance of Ti and inevitable impurities, sponge titanium, high-purity molybdenum and pure tin are respectively weighed as raw materials; secondly, preparing a monolithic electrode: preparing the raw materials of the step one into a single electrode; thirdly, preparing a consumable electrode: assembling and welding the single electrode prepared in the step two into a consumable electrode in a vacuum welding box; fourthly, preparing an ingot: carrying out three times of smelting on the consumable electrode prepared in the step three in a vacuum consumable electric arc furnace to prepare an ingot; fifthly, preparing a cold-rolled sample: cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching; sixthly, cold rolling and solution treatment: and (4) repeatedly cold-rolling the cold-rolled sample prepared in the fifth step to the required size in a double-roller cold-rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the Ti-12Mo-5Zr-3Sn (wt.%) titanium alloy.
Example 5:
firstly, weighing the following components: according to the weight percentage of each element, 10% of Mo, 1% of Fe, the balance of Ti and inevitable impurities, respectively weighing sponge titanium, high-purity molybdenum and iron nails as raw materials; secondly, preparing a monolithic electrode: preparing the raw materials of the step one into a single electrode; thirdly, preparing a consumable electrode: assembling and welding the single electrode prepared in the step two into a consumable electrode in a vacuum welding box; fourthly, preparing an ingot: carrying out three times of smelting on the consumable electrode prepared in the step three in a vacuum consumable electric arc furnace to prepare an ingot; fifthly, preparing a cold-rolled sample: cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching; sixthly, cold rolling and solution treatment: and (4) repeatedly cold-rolling the cold-rolled sample prepared in the fifth step to the required size in a double-roller cold-rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the Ti-10Mo-1Fe (wt.%) titanium alloy.
The following table gives examples of various combinations of the invention:
| Mo Zr(％) | 12+5 | 12+1 | 12+10 | 10+15 | 14+3 |
| Mo Sn(％) | 12+3 | 12+5 | 12+8 | 10+15 | 14+3 |
| Mo Fe(％) | 10+0.25 | 10+0.5 | 10+1 | 10+2 | |
| Mo Zr Sn(％) | 12+5+3 | 12+3+5 | 12+5+5 | 10+8+8 | 14+3+3 |
| Mo Zr Fe(％) | 10+5+0.5 | 10+3+1 | 10+1+2 | ||
| Mo Sn Fe(％) | 10+5+0.5 | 10+3+1 | 10+1+2 | ||
| Mo Zr Sn Fe(％) | 10+5+5+0.5 | 10+3+3+1 |
the mechanical results show that the series of alloys have excellent cold working performance (the cold rolling deformation rate is more than 95%), high strength (the tensile strength UTS is 900-1200 MPa), excellent plasticity (the uniform plastic deformation capacity epsilon is more than or equal to 30%) and good work hardening behavior (the work hardening interval exceeds 200MPa), and Ti-Mo-based metastable β titanium alloy (figures 1 and 2) is obtained through microstructure analysis, the series of Ti-Mo-based alloys are composed of single β in a solid solution state, and the series of alloys generate multiple deformation mechanisms such as slippage, stress induced martensite transformation α' and {332} <113> mechanical twin crystals (figures 3 and 4) in the plastic deformation process, so that the alloys have the excellent performance.
FIG. 1 is a true stress-strain curve of some typical Ti-Mo based TRIP/TWIP titanium alloys, and for comparison, the true stress-strain curves of Ti-6Al-4V alloys (as annealed), 'Gum alloys' and 18.8% Mn TRIP/TWIP steels are also plotted on this graph.
FIG. 2 is a plot of true stress strain and work hardening rate for Ti-Mo based TRIP/TWIP titanium alloys of varying compositions. FIG. 2(a) is a work-hardening rate curve of a Ti-12Mo alloy; FIG. 2(b) is a work-hardening rate curve of a Ti-12Mo-5Zr alloy; FIG. 2(c) is a work-hardening rate curve for a Ti-12Mo-5S alloy; FIG. 2(d) is a work hardening rate curve of Ti-10 Mo-1F; FIG. 2(e) is a work hardening rate curve of Ti-12Mo-5Zr-3 Sn.
FIG. 3 XRD patterns (X-ray diffraction patterns) of Ti-12Mo-5Zr alloy before and after deformation, the results show that the alloy is composed of β phase and a small amount of quenched omega phase in solid solution state (before deformation), and a large amount of stress-induced martensite α' is generated after deformation.
Fig. 4 is an EBSD (electron back scattering diffraction analysis technique) diagram of a Ti-12Mo alloy at a deformation amount ∈ of 0.015, fig. 4(a) contrast mapping; FIG. 4(b) invert pole configuration (reverse pole). It can be seen that stress-induced {332} <113> twinning and stress-induced martensitic transformation occur simultaneously during deformation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are included in the protection scope of the present invention.
Claims (3)
1. A high-strength high-plasticity β titanium alloy with TRIP/TWIP effect is characterized by comprising the following components by weight percent, Mo 12%, Zr 5%, Fe 0.5% -1.5%, and the balance of Ti and inevitable impurities, and the preparation process comprises the following steps:
firstly, weighing titanium sponge, high-purity molybdenum, pure zirconium and iron nails as raw materials according to the weight percentage of each element;
secondly, preparing the raw materials in the step one into a single electrode;
thirdly, the single electrode prepared in the second step is assembled and welded into a consumable electrode in a vacuum welding box;
fourthly, carrying out three times of smelting on the consumable electrode prepared in the third step in a vacuum consumable electric arc furnace to prepare an ingot;
fifthly, cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode spark cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching;
and sixthly, repeatedly cold-rolling the cold-rolled sample prepared in the step five to the required size in a double-roller cold rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the required titanium alloy material.
2. The high-strength high-plasticity β titanium alloy with the TRIP/TWIP effect is characterized by comprising the following components in percentage by weight, Mo 12%, Zr 5%, Sn 3%, and the balance of Ti and inevitable impurities, and the preparation process comprises the following steps:
firstly, weighing titanium sponge, high-purity molybdenum, pure zirconium and pure tin as raw materials according to the weight percentage of each element;
secondly, preparing the raw materials in the step one into a single electrode;
thirdly, the single electrode prepared in the second step is assembled and welded into a consumable electrode in a vacuum welding box;
fourthly, carrying out three times of smelting on the consumable electrode prepared in the third step in a vacuum consumable electric arc furnace to prepare an ingot;
fifthly, cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode spark cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching;
and sixthly, repeatedly cold-rolling the cold-rolled sample prepared in the step five to the required size in a double-roller cold rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the required titanium alloy material.
3. The high-strength high-plasticity β titanium alloy with the TRIP/TWIP effect is characterized by comprising the following components in percentage by weight, Mo 12%, Sn 5%, Fe 0.5% -1.5%, and the balance of Ti and inevitable impurities, and the preparation process comprises the following steps:
firstly, weighing titanium sponge, high-purity molybdenum, pure tin and iron nails as raw materials according to the weight percentage of each element;
secondly, preparing the raw materials in the step one into a single electrode;
thirdly, the single electrode prepared in the second step is assembled and welded into a consumable electrode in a vacuum welding box;
fourthly, carrying out three times of smelting on the consumable electrode prepared in the third step in a vacuum consumable electric arc furnace to prepare an ingot;
fifthly, cutting a cold-rolled sample with a proper size from the ingot prepared in the step four by using a wire-electrode spark cutting machine, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching;
and sixthly, repeatedly cold-rolling the cold-rolled sample prepared in the step five to the required size in a double-roller cold rolling device at room temperature, then carrying out solution treatment in a vacuum quenching furnace, and then carrying out water quenching to obtain the required titanium alloy material.
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| US2691578A (en) * | 1951-04-12 | 1954-10-12 | Allegheny Ludlum Steel | Iron-molybdenum titanium base alloys |
| JPH10121184A (en) * | 1996-10-11 | 1998-05-12 | Kubota Corp | Composite sintered alloy for member for molten nonferrous metal |
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