CN104259446B - A kind of pollution-free high-efficient refinement titanium aluminum alloy method - Google Patents
A kind of pollution-free high-efficient refinement titanium aluminum alloy method Download PDFInfo
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- CN104259446B CN104259446B CN201410508694.XA CN201410508694A CN104259446B CN 104259446 B CN104259446 B CN 104259446B CN 201410508694 A CN201410508694 A CN 201410508694A CN 104259446 B CN104259446 B CN 104259446B
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- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
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Abstract
A kind of pollution-free high-efficient refinement titanium aluminum alloy method, the present invention relates to a kind of method of pollution-free refinement titanium aluminum alloy. The present invention is that after being solved tradition metallurgy method titanium aluminum alloy casting, gained is organized thick, and there is very serious segregation and defect, and temperature-room type plasticity is very poor, fragility is very big, and is difficult to shaping problem. It realizes according to the following steps: one, material is placed among the bar layer of titanium aluminum alloy melt smelting apparatus, is placed in the middle of coil; Two, will be connected in ruhmkorff coil with electrode; Three, ultrasonic device is fixed on upper locating device by union lever; Four, by locating device, ultrasonic device tool heads is contacted with mould shell end face; Five, vacuum pump is opened; Six, ruhmkorff coil applies power; When seven, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 0��90s; Eight, take out and smash mould shell, obtain the titanium aluminium bar of refinement. The present invention is applied to ultrasonic wave refinement titanium aluminum alloy field.
Description
Technical field
The present invention relates to a kind of method of pollution-free high-efficient refinement titanium aluminum alloy.
Background technology
With regard to tradition metallurgy method, after titanium aluminum alloy casting, gained is organized very thick, and there is very serious segregation and defect, and temperature-room type plasticity is very poor, fragility is very big, and is difficult to shaping. Have to pass through the modes such as alloying, thermal treatment, viscous deformation and refinement microstructure could improve temperature-room type plasticity and hot strength etc., the needs of materials application could be met. Titanium aluminum alloy refinement is carried out to refinement and solid-state phase changes refinement by process of setting, and process of setting carries out refinement titanium aluminum alloy is main refinement approach. As: first and second in generation titanium aluminium base alloy carry out thinning microstructure by solution strengthening or viscous deformation improve the plasticity of alloy and anti-oxidant, creep-resistant property by adding alloy element. But now to the development of titanium aluminum alloy, it is desired to continue to improve its performance and use temperature, to meet the demand of every profession and trade. Although material thinning solidification structure is had the significant effect of comparison by tradition metallurgy method, but the repeatable utilization for material has unsatisfactory part. Wherein, adopt ultrasonic technique to be processed by alloy melt and just meet this developing direction, it is the new technique that a kind of pollution-free, high-level efficiency and development potentiality are very big, but ultrasonic applications is in titanium aluminum alloy fusion process rarely seen report at home and abroad, this is mainly owing to titanium aluminum alloy is very big in its activity of melt state, it is necessary to vacuum state and protective atmosphere; In addition the use of ultrasonic transducer has again certain temperature limitation, and operation under vacuum conditions, ultrasonic wave is difficult to introduce.
Summary of the invention
The present invention is that after being solved tradition metallurgy method titanium aluminum alloy casting, gained is organized thick, and there is very serious segregation and defect, temperature-room type plasticity is very poor, fragility is very big, and is difficult to shaping problem, and provides a kind of pollution-free high-efficient refinement titanium aluminum alloy method.
A kind of pollution-free high-efficient refinement titanium aluminum alloy method, it realizes according to the following steps:
Step one, in vacuum chamber, material is placed among the bar layer of titanium aluminum alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, coil is connected with electrode; Wherein, the internal diameter of described coil isQuantity 8 circle, described electrode is single phase alternating current;
Step 3: ultrasonic generator is fixed on upper locating device by union lever;
Step 4, by upper locating device, T8 steel tool heads is contacted with mould shell end face;
Step 5, unlatching vacuum pump, be evacuated to below 1Pa by vacuum room pressure, 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 apply power, heating power is 5��15kW, heat-up time 5��15min;
When step 7, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 0��90s;
Lead in step 8, vacuum chamber into air, open vacuum chamber, take out and smash mould shell, obtain the titanium aluminium bar of refinement.
The present invention has the following advantages:
One, in the inventive method, the bar of titanium aluminum alloy melts in yttrium oxide shuttering, avoids melt contamination, and then realizes indirectly importing in titanium aluminum alloy melt ultrasonic wave. Two, the inventive method uses ultrasonication titanium aluminum alloy melt to have advantage pollution-free, high-level efficiency reusable edible material. Three, the inventive method uses ultrasonication alloy melt, solidifies that rear gained tissue can obviously 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 gets involved and ingot casting is changed to equiax crystal by columanar structure, during ultrasonic time 90s, obtains very tiny equiax crystal completely, and its lamella group size is reduced to 88.1 ��m by during 30s 1004.7 ��m, refinement 11 times.
Supersound 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 ultimate compression strength of alloy can increase, and can reach compressive strength when ultrasonic time is 90s more than 1700MPa.
The flowing that ultrasonic wave effect titanium aluminum alloy melt increases melt can cause dendritic arm fracture, fusing, becomes new shape caryoplasm point, adds nucleation rate, can cause the recrystallize of crystal grain in addition by acoustic pressure effect, be changed into tiny equiax crystal.
Accompanying drawing explanation
The schematic diagram of Fig. 1 apparatus of the present invention;
Fig. 2 is the partial enlargement figure of in Fig. 1 I;
Fig. 3 (a) is the effect diagram that tangent plane organized by ingot casting by ultrasonication 0s;
Fig. 3 (b) is the effect diagram that tangent plane organized by ingot casting by ultrasonication 30s;
Fig. 3 (c) is the effect diagram that tangent plane organized by ingot casting by ultrasonication 60s;
Fig. 3 (d) is the effect diagram that tangent plane organized by ingot casting by ultrasonication 90s;
Fig. 4 (a) is heating power is that 6kW is to the effect diagram of supersound process ingot casting group;
Fig. 4 (b) is heating power is that 8kW is to the effect diagram of supersound process ingot casting group;
Fig. 4 (c) is heating power is that 10kW is to the effect diagram of supersound process ingot casting group;
Fig. 5 (a) heat-up time is that 6min is to supersound process ingot casting sample macrostructure photo figure;
Fig. 5 (b) heat-up time is that 8min is to supersound process ingot casting sample macrostructure photo figure;
Fig. 5 (c) heat-up time is that 10min is to supersound process ingot casting sample macrostructure photo figure.
Embodiment
Embodiment one: a kind of pollution-free high-efficient refinement titanium aluminum 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 aluminum alloy melt smelting apparatus, is placed in the middle of coil 9;
Step 2, coil 9 is connected with electrode; Wherein, the internal diameter of described coil 9 isQuantity 8 circle, described electrode is single phase alternating current;
Step 3: ultrasonic generator is fixed on upper locating device 2 by union lever 3;
Step 4, by upper locating device 2, T8 steel tool heads 8 is contacted with mould shell 12 end face;
Step 5, unlatching vacuum pump 17, be evacuated to below 1Pa by vacuum room pressure, 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-up time 5��15min;
When step 7, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 0��90s;
Lead in step 8, vacuum chamber into air, open vacuum chamber, take out and smash mould shell, obtain the titanium aluminium bar of refinement.
Present embodiment has the following advantages:
One, in present embodiment method, the bar of titanium aluminum alloy melts in yttrium oxide shuttering, avoids melt contamination, and then realizes indirectly importing in titanium aluminum alloy melt ultrasonic wave. Two, the inventive method uses ultrasonication titanium aluminum alloy melt to have advantage pollution-free, high-level efficiency reusable edible material. Three, the inventive method uses ultrasonication alloy melt, solidifies that rear gained tissue can obviously 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 gets involved and ingot casting is changed to equiax crystal by columanar structure, during ultrasonic time 90s, obtains very tiny equiax crystal completely, and its lamella group size is reduced to 88.1 ��m by during 30s 1004.7 ��m, refinement 11 times.
Supersound 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 ultimate compression strength of alloy can increase, and can reach compressive strength when ultrasonic time is 90s more than 1700MPa.
The flowing that ultrasonic wave effect titanium aluminum alloy melt increases melt can cause dendritic arm fracture, fusing, becomes new shape caryoplasm point, adds nucleation rate, can cause the recrystallize of crystal grain in addition by acoustic pressure effect, be changed into tiny equiax crystal.
Embodiment two: present embodiment and embodiment one the difference is that: ultrasonic generator described in step 3 produces the concussion electrical signal that frequency is 20KHz.
Other step and parameter are identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two the difference is that: the smelting apparatus innermost layer mould shell of titanium aluminum alloy described in step one is yttrium oxide shuttering.
Other step and parameter are identical with embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three the difference is that: layer 13 outer wrap of bar described in step one has mould shell 12, described mould shell 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 mould shell 12 and alundum tube 10 centre.
Other step and one of parameter and embodiment one to three are identical.
Embodiment five: one of present embodiment and embodiment one to four the difference is that: step 2 coil 9 material is copper tube, and inside is connected with water coolant.
Other step and one of parameter and embodiment one to four are identical.
Embodiment:
The method in embodiment one is adopted to carry out:
Step one, in vacuum chamber, material is placed among the bar layer of titanium aluminum alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, ruhmkorff coil is connected with electrode; Wherein, the internal diameter of described coil isQuantity 8 circle, described electrode is single phase alternating current;
Step 3: ultrasonic device is fixed on upper locating device by union lever;
Step 4, by locating device, ultrasonic device tool heads is contacted with mould shell end face;
Step 5, unlatching vacuum pump, be evacuated to below 1Pa by vacuum room pressure, 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, ruhmkorff coil apply power, heating power is 10kW, heat-up time 10min;
When step 7, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 45s;
Lead in step 8, vacuum chamber into air, open vacuum chamber, take out and smash mould shell, obtain the titanium aluminium bar of refinement.
A kind of pollution-free high-efficient refinement titanium aluminum alloy device of present embodiment, it comprises with lower part:
Tank body 1, vacuum pump 17, ultrasonic generator 16, ultra-sonic oscillation equipment and titanium aluminum alloy melt melting equipment;
Wherein, described ultra-sonic oscillation equipment comprises locating device 2, union lever 3, insulating mat 4, transverter 5, anchor 6, aluminium alloy horn 7 and T8 steel tool heads 8;
Wherein, described titanium aluminum alloy melt melting equipment comprises coil 9, alundum tube 10, mullite fiber layer 11, mould shell 12, bar layer 13, graphite felt 14 and lower fixed link 15;
Described upper locating device 2 is fixed on the upper middle part of tank body 1, described lower fixed link 15 is fixed on the lower middle part of tank body 1, the center of described upper locating device 2 and lower fixed link 15 is point-blank, described vacuum pump 16 is arranged on the sidewall of tank body 1, described union lever 3 one end is connected with upper locating device 2 by bolt, described union lever 3 the other end is connected with anchor 6, described insulating mat 4 is positioned at the position, center of the upper cover of anchor 6, contact with the terminal stud of transverter 5, described anchor 6 is bolted and covers on transverter 5, described aluminium alloy luffing device 7 one end is fixedly connected with transverter 5, described luffing device 7 the other end is fixedly connected with T8 steel tool heads 8,
Described lower fixed link 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 mould shell 12, described mould shell 12 inside is filled with bar layer 13, is filled with mullite fiber layer 11 in the space of described mould shell 12 and alundum tube 10 centre.
In order to understand heating power, heat-up time and ultrasonic treatment time more clearly to the impact of Ti-Al alloy structure performance, test respectively, in table 1, table 2 and table 3;
Result: alloying constituent is Ti-46Al-0.5Si-0.5W-0.3Y;
From Fig. 3 (a)��3 (d), column crystal time not ultrasonic, the equiax crystal of big block can be changed into through ultrasonic 30s, being increased to 60s and can find 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, it can be seen that the ultrasonic impact on manager's metamorphosis is still very significant;
Composition graphs 4 (a)��4 (c) illustrates the present embodiment, the invention effect display of the present embodiment, it can be seen that hyperacoustic introducing makes the ingot casting obtained all eliminate column crystal, and obtains equiax crystal. Power is by 6kW to 10kW change procedure, can find out that big block equiax crystal turns into fritter equiax crystal, this mainly 8kW when melt temperature higher, have certain superheating temperature, in this temperature range, carry out the change that supersound process can effectively cause melt solidifying process.
Composition graphs 5 (a)��5 (c) illustrates the present embodiment, the invention effect display of the present embodiment, when ultrasonic time and heating power are certain, during 6min heat-up time, what obtain is the equiax crystal of big block, and time heat-up time is 8min, the equiax crystal obtained significantly diminishes, this is mainly by the impact of superheating temperature, it can be seen that when ultrasonic time is certain along with the increase of superheating temperature, have refining effect within the specific limits. And when 10min heat-up time, obtain more tiny equiax crystal.
Table 1 ultrasonic treatment time is tested
Table 2 heating power is tested
Table 3 test heat-up time
The method in embodiment one is adopted to carry out:
Step one, in vacuum chamber, material is placed among the bar layer of titanium aluminum alloy melt smelting apparatus, is placed in the middle of coil;
Step 2, ruhmkorff coil is connected with electrode; Wherein, the internal diameter of described coil isQuantity 8 circle, described electrode is single phase alternating current;
Step 3: ultrasonic device is fixed on upper locating device by union lever;
Step 4, by locating device, ultrasonic device tool heads is contacted with mould shell end face;
Step 5, unlatching vacuum pump, be evacuated to below 1Pa by vacuum room pressure, 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, ruhmkorff coil apply power, heating power is 5kW, heat-up time 13min;
When step 7, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 10s;
Lead in step 8, vacuum chamber into air, open vacuum chamber, take out and smash mould shell, obtain the titanium aluminium bar of refinement.
Claims (4)
1. a pollution-free high-efficient refinement titanium aluminum alloy method, it is characterised in that it realizes according to the following steps:
Step one, in vacuum chamber, material is placed among the bar layer (13) of titanium aluminum alloy melt smelting apparatus, is placed in the middle of coil (9);
Step 2, coil (9) is connected with electrode; Wherein, the internal diameter of described coil (9) isQuantity 8 circle, described electrode is single phase alternating current; Wherein, described step 2 coil (9) material is copper tube, and inside is connected with water coolant;
Step 3: ultrasonic generator is fixed on upper locating device (2) by union lever (3);
Step 4, by upper locating device (2), T8 steel tool heads (8) is contacted with mould shell (12) end face;
Step 5, unlatching vacuum pump (17), be evacuated to below 1Pa by vacuum room pressure, 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, heating power is 5��15kW, heat-up time 5��15min;
When step 7, unloading power, utilizing ultrasonic generator to add ultrasonic wave, the supersound process time is 0��90s;
Lead in step 8, vacuum chamber into air, open vacuum chamber, take out and smash mould shell, obtain the titanium aluminium bar of refinement.
2. a kind of pollution-free high-efficient refinement titanium aluminum alloy method according to claim 1, it is characterised in that ultrasonic generator described in step 3 produces the concussion electrical signal that frequency is 20KHz.
3. a kind of pollution-free high-efficient refinement titanium aluminum alloy method according to claim 2, it is characterised in that the smelting apparatus innermost layer mould shell of titanium aluminum alloy described in step one is yttrium oxide shuttering.
4. a kind of pollution-free high-efficient refinement titanium aluminum alloy method according to claim 3, it is characterized in that layer (13) outer wrap of bar described in step one has mould shell (12), described mould shell (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 mould shell (12) and alundum tube (10) centre.
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| CN113278809B (en) * | 2021-05-24 | 2022-09-16 | 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 |
| CN113444901B (en) * | 2021-06-28 | 2022-08-02 | 哈尔滨工业大学 | Ultrasonic-assisted fusing device and method for vacuum ultrahigh-temperature refractory active material |
| 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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| CN201538802U (en) * | 2009-10-23 | 2010-08-04 | 陈元平 | Treatment system for high-power ultrasonic alloy melt |
| CN101758206A (en) * | 2009-11-11 | 2010-06-30 | 苏州有色金属研究院有限公司 | Casting method capable of improving quality of aluminum and aluminum alloy ingots |
| JP5673157B2 (en) * | 2010-02-08 | 2015-02-18 | 日本軽金属株式会社 | Ultrasonic horn and method for producing aluminum alloy using the same |
| CN102554195A (en) * | 2011-12-31 | 2012-07-11 | 大连理工大学 | Power ultrasonic device for treating high-temperature metal melt under vacuum state and method thereof |
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