CN104259446A - Pollution-free and efficient method for refining titanium-aluminum alloy - Google Patents
Pollution-free and efficient method for refining titanium-aluminum alloy Download PDFInfo
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- CN104259446A CN104259446A CN201410508694.XA CN201410508694A CN104259446A CN 104259446 A CN104259446 A CN 104259446A CN 201410508694 A CN201410508694 A CN 201410508694A CN 104259446 A CN104259446 A CN 104259446A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
Abstract
The invention discloses a pollution-free and efficient method for refining titanium-aluminum alloy, which solves the problems that a traditional titanium-aluminum alloy casted is thick in tissue, very bad in room temperature plasticity and large in brittleness, is difficult to form, and has very serious segregation. The pollution-free and efficient method comprises the steps below: firstly, a material is placed in a bar layer of a titanium-aluminum alloy melt melting device in the middlemost of a coiler; secondly, an induction coil is connected with an electrode; thirdly, a loudspeaker is fixed on an upper locating device through a connecting rod; fourthly, a tool head of an ultrasonic machine is in contact with the top of a formwork through the locating device; fifth, a vacuum pump is started; sixth, the induction coil is applied with power; seventh, when the power is unloaded, an ultrasonic generating device is used for adding an ultrasonic wave for the ultrasonic treatment time for 0-90s; and eighth, the formwork is taken out and crushed to obtain a refined titanium-aluminum rod. The pollution-free and efficient method provided by the invention is applied to the field of ultrasonically refining titanium-aluminum alloy.
Description
Technical field
The present invention relates to a kind of method of pollution-free high-efficient refinement titanium-aluminium alloy.
Background technology
With regard to conventional metallurgical method, after titanium-aluminium alloy casting, gained is organized very thick, and there is very serious segregation and defect, and the non-constant of temperature-room type plasticity, fragility are very large, and are difficult to shaping.Have to pass through the modes such as alloying, heat treatment, plastic deformation and refinement microstructure could improve temperature-room type plasticity and elevated temperature strength etc., the needs of materials application could be met.By process of setting, refinement and solid-state phase changes refinement are carried out for titanium-aluminium alloy refinement, and process of setting carries out refinement titanium-aluminium alloy is main refinement approach.As: first and second in generation titanium aluminium base alloy carry out thinning microstructure by solution strengthening or plastic deformation carry heavy alloyed plasticity and anti-oxidant, creep-resistant property by adding alloy element.But the development now to titanium-aluminium alloy, require to continue to improve its performance and serviceability temperature, to meet the demand of every profession and trade.Although conventional metallurgical method has more significant effect to material thinning solidification structure, the repeatability for material utilizes but unsatisfactory part.Wherein, ultrasonic technique alloy melt is adopted to carry out processing and just meet this developing direction, it is the new technique that a kind of pollution-free, high efficiency and development potentiality are very large, but ultrasonic applications is in titanium-aluminium alloy fusion process rarely seen report at home and abroad, this is mainly very large in its activity of melt state due to titanium-aluminium alloy, needs vacuum state and protective atmosphere; In addition the use of ultrasonic transducer has again certain temperature limiting, and operation under vacuum conditions, ultrasonic wave is difficult to introduce.
Summary of the invention
The present invention is that after will solving the casting of conventional metallurgical method titanium-aluminium alloy, gained is organized thick, and there is very serious segregation and defect, the non-constant of temperature-room type plasticity, fragility are very large, and are difficult to shaping problem, and provide a kind of pollution-free high-efficient refinement titanium-aluminium alloy method.
A kind of pollution-free high-efficient refinement titanium-aluminium alloy method, it realizes according to the following steps:
Step one, in vacuum chamber, material is placed among the bar layer of titanium-aluminium alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, will to be connected in coil with electrode; Wherein, the internal diameter of described coil is
quantity 8 circle, described electrode is single-phase alternating current;
Step 3: supersonic generator is fixed on upper positioner by connecting rod;
Step 4, by upper positioner, T8 steel tool heads to be contacted with formwork end face;
Step 5, unlatching vavuum pump, vacuum chamber internal gas pressure is evacuated to below 1Pa, and then the anti-high-purity argon gas that fills is to 300Pa, repeats 3 ~ 5 operations, last secondary applying argon gas to 7.5 × 10
4pa;
Step 6, coil apply power, and heating power is 5 ~ 15kW, heat time 5 ~ 15min;
When step 7, unloading power, utilize ultrasonic generator to add ultrasonic wave, sonication treatment time is 0 ~ 90s;
Pass into air in step 8, vacuum chamber, open vacuum chamber, take out and smash formwork, obtain the titanium aluminium bar of refinement.
The present invention has the following advantages:
One, in the inventive method, the bar of titanium-aluminium alloy melts in yttrium oxide shuttering, avoids melt contamination, and then realize ultrasonic wave indirectly to import in titanium-aluminium alloy melt.Two, the inventive method uses ultrasonic wave process titanium-aluminium alloy melt to have advantage that is pollution-free, high efficiency reusable edible material.Three, the inventive method uses ultrasonic wave process alloy melt, solidifies that rear gained tissue obviously can obtain refinement, more evenly, the performance of alloy also obtains raising in various degree, sees Fig. 3.
Along with the increase of ultrasonic time, thinning effect is become better and better.Ultrasonic wave is got involved and ingot casting is changed to equiax crystal by columanar structure, during ultrasonic time 90s, obtains very tiny equiax crystal completely, its lamella group size by during 30s 1004.7 μm be reduced to 88.1 μm, refinement 11 times.
Ultrasonic process Ti-46Al-0.5Si-0.5W-0.3Y alloy, along with the increase of ultrasonic time, precipitate obviously reduces, make structural constituent evenly.Along with the increase of ultrasonic time, the compression strength of alloy can increase, and can reach compressive strength more than 1700MPa when ultrasonic time is 90s.
The flowing that ul-trasonic irradiation titanium-aluminium alloy melt increases melt can cause dendritic arm to rupture, fuse, and becomes new forming core particle, adds nucleation rate, can be caused the recrystallization of crystal grain in addition by acoustic pressure effect, change tiny equiax crystal into.
Accompanying drawing explanation
The schematic diagram of Fig. 1 apparatus of the present invention;
Fig. 2 is the partial enlarged drawing of in Fig. 1 I;
Fig. 3 (a) is that ultrasonic wave process 0s is to the effect diagram of ingot structure tangent plane;
Fig. 3 (b) is that ultrasonic wave process 30s is to the effect diagram of ingot structure tangent plane;
Fig. 3 (c) is that ultrasonic wave process 60s is to the effect diagram of ingot structure tangent plane;
Fig. 3 (d) is that ultrasonic wave process 90s is to the effect diagram of ingot structure tangent plane;
Fig. 4 (a) is heating power is the effect diagram of 6kW to ultrasonic process ingot casting group;
Fig. 4 (b) is heating power is the effect diagram of 8kW to ultrasonic process ingot casting group;
Fig. 4 (c) is heating power is the effect diagram of 10kW to ultrasonic process ingot casting group;
Fig. 5 (a) heat time is that 6min is to ultrasonic process ingot casting sample macrograph figure;
Fig. 5 (b) heat time is that 8min is to ultrasonic process ingot casting sample macrograph figure;
Fig. 5 (c) heat time is that 10min is to ultrasonic process ingot casting sample macrograph figure.
Detailed description of the invention
Detailed description of the invention one: a kind of pollution-free high-efficient refinement titanium-aluminium alloy method of present embodiment, it realizes according to the following steps:
Step one, in vacuum chamber, material is placed among the bar layer 13 of titanium-aluminium alloy melt smelting apparatus, is placed in the middle of coil 9;
Step 2, will to be connected in coil 9 with electrode; Wherein, the internal diameter of described coil 9 is
quantity 8 circle, described electrode is single-phase alternating current;
Step 3: supersonic generator is fixed on upper positioner 2 by connecting rod 3;
Step 4, by upper positioner 2, T8 steel tool heads 8 to be contacted with formwork 12 end face;
Step 5, unlatching vavuum pump 17, vacuum chamber internal gas pressure is evacuated to below 1Pa, and then the anti-high-purity argon gas that fills is to 300Pa, repeats 3 ~ 5 operations, last secondary applying argon gas to 7.5 × 104Pa;
Step 6, coil 9 apply power, and heating power is 5 ~ 15kW, heat time 5 ~ 15min;
When step 7, unloading power, utilize ultrasonic generator to add ultrasonic wave, sonication treatment time is 0 ~ 90s;
Pass into air in step 8, vacuum chamber, open vacuum chamber, take out and smash formwork, obtain the titanium aluminium bar of refinement.
Present embodiment has the following advantages:
One, in present embodiment method, the bar of titanium-aluminium alloy melts in yttrium oxide shuttering, avoids melt contamination, and then realize ultrasonic wave indirectly to import in titanium-aluminium alloy melt.Two, the inventive method uses ultrasonic wave process titanium-aluminium alloy melt to have advantage that is pollution-free, high efficiency reusable edible material.Three, the inventive method uses ultrasonic wave process alloy melt, solidifies that rear gained tissue obviously can obtain refinement, more evenly, the performance of alloy also obtains raising in various degree, sees Fig. 3.
Along with the increase of ultrasonic time, thinning effect is become better and better.Ultrasonic wave is got involved and ingot casting is changed to equiax crystal by columanar structure, during ultrasonic time 90s, obtains very tiny equiax crystal completely, its lamella group size by during 30s 1004.7 μm be reduced to 88.1 μm, refinement 11 times.
Ultrasonic process Ti-46Al-0.5Si-0.5W-0.3Y alloy, along with the increase of ultrasonic time, precipitate obviously reduces, make structural constituent evenly.Along with the increase of ultrasonic time, the compression strength of alloy can increase, and can reach compressive strength more than 1700MPa when ultrasonic time is 90s.
The flowing that ul-trasonic irradiation titanium-aluminium alloy melt increases melt can cause dendritic arm to rupture, fuse, and becomes new forming core particle, adds nucleation rate, can be caused the recrystallization of crystal grain in addition by acoustic pressure effect, change tiny equiax crystal into.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: supersonic generator described in step 4 produces the concussion signal of telecommunication that frequency is 20KHz.
Other step and parameter identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one or two unlike: the refinement of pollution-free high-efficient described in step one titanium-aluminium alloy device is yttrium oxide shuttering.
Other step and parameter identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three unlike: the layer 13 of bar described in step 2 outer wrap has formwork 12, described formwork 12 outer wrap has alundum tube 10, described alundum tube 10 outside is tied with coil 9, is filled with mullite fiber layer 11 in the space of described formwork 12 and alundum tube 10 centre.
Other step and parameter identical with one of detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four unlike: step 3 coil 9 material is copper tube, and inside is connected with cooling water.
Other step and parameter identical with one of detailed description of the invention one to four.
Embodiment:
The method in detailed description of the invention one is adopted to carry out:
Step one, in vacuum chamber, material is placed among the bar layer of titanium-aluminium alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, will to be connected in induction coil with electrode; Wherein, the internal diameter of described coil is
quantity 8 circle, described electrode is single-phase alternating current;
Step 3: ultrasonic device is fixed on upper positioner by connecting rod;
Step 4, by positioner, ultrasonic device tool heads to be contacted with formwork end face;
Step 5, unlatching vavuum pump, vacuum chamber internal gas pressure is evacuated to below 1Pa, and then the anti-high-purity argon gas that fills is to 300Pa, repeats 3 ~ 5 operations, last secondary applying argon gas to 7.5 × 10
4pa.
Step 6, induction coil apply power, and heating power is 10kW, heat time 10min;
When step 7, unloading power, utilize ultrasonic generator to add ultrasonic wave, sonication treatment time is 45s;
Pass into air in step 8, vacuum chamber, open vacuum chamber, take out and smash formwork, obtain the titanium aluminium bar of refinement.
A kind of pollution-free high-efficient refinement titanium-aluminium alloy device of present embodiment, it comprises with lower part:
Tank body 1, vavuum pump 17, supersonic generator 16, supersonic oscillations equipment and titanium-aluminium alloy melt smelting equipment;
Wherein, described supersonic oscillations equipment comprises positioner 2, connecting rod 3, felt pad 4, transducer 5, fixed mount 6, aluminium alloy ultrasonic transformer 7 and T8 steel tool heads 8;
Wherein, described titanium-aluminium alloy melt smelting equipment comprises coil 9, alundum tube 10, mullite fiber layer 11, formwork 12, bar layer 13, graphite felt 14 and lower fixed bar 15;
Described upper positioner 2 is fixed on the upper middle part of tank body 1, described lower fixed bar 15 is fixed on the lower middle part of tank body 1, the center of described upper positioner 2 and lower fixed bar 15 point-blank, described vavuum pump 16 is arranged on the sidewall of tank body 1, described connecting rod 3 one end is connected with upper positioner 2 by bolt, described connecting rod 3 other end is connected with fixed mount 6, described felt pad 4 is positioned at the centre of the upper cover of fixed mount 6, contact with the binding post of transducer 5, described fixed mount 6 is bolted and covers on transducer 5, described aluminium alloy amplitude transformer 7 one end is fixedly connected with transducer 5, described amplitude transformer 7 other end is fixedly connected with T8 steel tool heads 8,
Described lower fixed bar 15 is fixed with graphite felt 14, described graphite felt 14 is fixed with alundum tube 10, described alundum tube 10 outside is tied with coil 9, described alundum tube 10 inside is wrapped with formwork 12, described formwork 12 inside is filled with bar layer 13, is filled with mullite fiber layer 11 in the space of described formwork 12 and alundum tube 10 centre.
In order to understand the impact on Ti-Al alloy structure performance of heating power, heat time and ultrasonic treatment time more clearly, test respectively, in table 1, table 2 and table 3;
Result: alloying component is Ti-46Al-0.5Si-0.5W-0.3Y;
From Fig. 3 (a) ~ 3 (d), column crystal time not ultrasonic, the equiax crystal of bulk can be changed into through ultrasonic 30s, being increased to 60s and can finding out middle equiax crystal and diminish along with the time, and when ultrasonic time reaches 90s time, macroscopical tangent plane of sample finds out it is very tiny crystal grain, can find out ultrasonic on manager's impact of metamorphosis or highly significant;
Composition graphs 4 (a) ~ 4 (c) illustrates the present embodiment, and the invention effect display of the present embodiment, can find out that the ingot casting that hyperacoustic introducing makes to obtain all eliminates column crystal, and obtain equiax crystal.Power is by 6kW to 10kW change procedure, can find out that bulk equiax crystal becomes fritter equiax crystal, this mainly under 8kW condition the temperature of melt higher, have certain degree of superheat, in this temperature range, carry out the change that ultrasonic process effectively can cause melt solidifying process.
Composition graphs 5 (a) ~ 5 (c) illustrates the present embodiment, the invention effect display of the present embodiment, ultrasonic time and heating power certain when, during heat time 6min, what obtain is the equiax crystal of bulk, and time the heat time is 8min, the equiax crystal obtained significantly diminishes, this mainly by the impact of the degree of superheat, can find out the increase along with the degree of superheat when ultrasonic time is certain, have refining effect within the specific limits.And when heat time 10min, obtain more tiny equiax crystal.
Table 1 ultrasonic treatment time is tested
Table 2 heating power is tested
Table 3 heat time tests
The method in detailed description of the invention one is adopted to carry out:
Step one, in vacuum chamber, material is placed among the bar layer of titanium-aluminium alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, will to be connected in induction coil with electrode; Wherein, the internal diameter of described coil is
quantity 8 circle, described electrode is single-phase alternating current;
Step 3: ultrasonic device is fixed on upper positioner by connecting rod;
Step 4, by positioner, ultrasonic device tool heads to be contacted with formwork end face;
Step 5, unlatching vavuum pump, vacuum chamber internal gas pressure is evacuated to below 1Pa, and then the anti-high-purity argon gas that fills is to 300Pa, repeats 3 ~ 5 operations, last secondary applying argon gas to 7.5 × 10
4pa.
Step 6, induction coil apply power, and heating power is 5kW, heat time 13min;
When step 7, unloading power, utilize ultrasonic generator to add ultrasonic wave, sonication treatment time is 10s;
Pass into air in step 8, vacuum chamber, open vacuum chamber, take out and smash formwork, obtain the titanium aluminium bar of refinement.
Claims (5)
1. a pollution-free high-efficient refinement titanium-aluminium alloy method, is characterized in that it realizes according to the following steps:
Step one, in vacuum chamber, material is placed among the bar layer (13) of titanium-aluminium alloy melt smelting apparatus, is placed in the middle of coil (9);
Step 2, will to be connected in coil (9) with electrode; Wherein, the internal diameter of described coil (9) is
quantity 8 circle, described electrode is single-phase alternating current;
Step 3: supersonic generator is fixed on upper positioner (2) by connecting rod (3);
Step 4, by upper positioner (2), T8 steel tool heads (8) to be contacted with formwork (12) end face;
Step 5, unlatching vavuum pump (17), vacuum chamber internal gas pressure is evacuated to below 1Pa, and then the anti-high-purity argon gas that fills is to 300Pa, repeats 3 ~ 5 operations, last secondary applying argon gas to 7.5 × 10
4pa;
Step 6, coil (9) apply power, and heating power is 5 ~ 15kW, heat time 5 ~ 15min;
When step 7, unloading power, utilize ultrasonic generator to add ultrasonic wave, sonication treatment time is 0 ~ 90s;
Pass into air in step 8, vacuum chamber, open vacuum chamber, take out and smash formwork, obtain the titanium aluminium bar of refinement.
2. a kind of pollution-free high-efficient refinement titanium-aluminium alloy method according to claim 1, is characterized in that supersonic generator described in step 3 produces the concussion signal of telecommunication that frequency is 20KHz.
3. a kind of pollution-free high-efficient refinement titanium-aluminium alloy method according to claim 2, is characterized in that the smelting apparatus of titanium-aluminium alloy described in step one innermost layer formwork is yttrium oxide shuttering.
4. a kind of pollution-free high-efficient refinement titanium-aluminium alloy method according to claim 3, it is characterized in that the layer of bar described in step one (13) outer wrap has formwork (12), described formwork (12) outer wrap has alundum tube (10), described alundum tube (10) outside is tied with coil (9), is filled with mullite fiber layer (11) in the space of described formwork (12) and alundum tube (10) centre.
5. a kind of pollution-free high-efficient refinement titanium-aluminium alloy method according to claim 4, it is characterized in that step 2 coil (9) material is copper tube, inside is connected with cooling water.
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Cited By (4)
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| CN113278809A (en) * | 2021-05-24 | 2021-08-20 | 武汉理工大学 | Method for treating aluminum alloy melt by gas-assisted ultrasonic treatment |
| CN113441692A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Rapid solidification device and solidification method for refined TiAl-based alloy |
| CN113444901A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Ultrasonic-assisted fusing device and method for vacuum ultrahigh-temperature refractory active material |
| CN115229167A (en) * | 2022-07-25 | 2022-10-25 | 哈尔滨工业大学 | Solidification equipment and method for preparing high-temperature alloy by applying bidirectional ultrasonic vibration |
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| CN115229167B (en) * | 2022-07-25 | 2024-01-26 | 哈尔滨工业大学 | Solidification equipment and method for preparing high-temperature alloy by applying bidirectional ultrasonic vibration |
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