CN1974801A - Electric ageing treatment process of high temperature monocrystalline alloy - Google Patents
Electric ageing treatment process of high temperature monocrystalline alloy Download PDFInfo
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- CN1974801A CN1974801A CN 200510047847 CN200510047847A CN1974801A CN 1974801 A CN1974801 A CN 1974801A CN 200510047847 CN200510047847 CN 200510047847 CN 200510047847 A CN200510047847 A CN 200510047847A CN 1974801 A CN1974801 A CN 1974801A
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- 230000032683 aging Effects 0.000 title claims abstract description 41
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 23
- 239000000956 alloy Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000013078 crystal Substances 0.000 claims description 37
- 229910000601 superalloy Inorganic materials 0.000 claims description 36
- 230000000694 effects Effects 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910000995 CMSX-10 Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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Abstract
The present invention relates to metal material heat treating technology, and is especially DC electric ageing treatment process of high temperature monocrystalline alloy. The high temperature monocrystalline alloy after solution treatment is heated to ageing treatment temperature inside one box-type resistance furnace, and the DC power source connected to the alloy is then turned on for the alloy to be ageing treated under the DC current action in the current density of 0.1-150 A/sq cm and at the temperature the same as the alloy use temperature for 10-100 hr. Applying DC current to the monocrystalline alloy under ageing treatment can promote the growth of the reinforcing gamma phase in the alloy and improve the structure of the alloy. The present invention has simple equipment, easy operation, high treating quality, short treating time, low power consumption and other advantages.
Description
Technical field
The present invention relates to metallic substance thermal treatment field, be specially a kind of galvanic current aging treatment method of single crystal super alloy.
Background technology
In order to adapt to the high-temperature behavior requirement of turbine engine blade, superalloy has experienced from the casting alloy to the directionally solidified superalloy, DS superalloy, arrives the evolution of single crystal super alloy again.Single crystal super alloy owing to eliminated the influence of crystal boundary, has obtained even more ideal mechanical behavior under high temperature.
Single crystal super alloy mainly depends on second to be strengthened mutually, the γ ' that is coherence strengthens mutually, the mutually existing intensity preferably of γ ' own can participate in deformation again, can not become the main strengthening phase of single crystal super alloy owing to separating out a large amount of γ ' phases or existing the γ ' phase of bulk to cause serious fragility.
The phase volume percentage ratio of γ ' phase is the primary condition that obtains strengthening effect.Along with the continuous development of superalloy, the composition of alloy is complicated more, and the important symbol that indicates the nickel base superalloy development to be the γ ' phase content of alloy constantly increase, along with γ ' phase content increases, the creep rupture strength of superalloy increases.
γ ' phase size size also is an important parameter of its strengthening effect of decision.γ ' strengthens by it and interaction of dislocation mutually and realizes, so γ ' strengthens mutually and have a critical size, when γ ' phase size during less than this threshold value, dislocation is passed through γ ' phase with the mechanism of cutting, along with γ ' size increases, the cutting resistance becomes big, and reinforcing degree rises; But when γ ' phase size during greater than this threshold value, the dislocation bypass mechanism will begin to start, thereby bypass mechanism will replace cutting mechanism, along with γ ' phase size becomes big, and the easier γ ' phase of walking around of dislocation, reinforcing degree decline.Can obtain best strengthening effect when therefore γ ' phase size is for threshold value.γ ' phase size threshold value and γ ' phase volume percentage ratio also have much relations, and along with γ ' phase volume percentage ratio increases, it is big that γ ' phase size threshold value becomes.Simultaneously, the pattern of γ ' phase and distribution also can have influence on its strengthening effect, and γ ' phase pattern is regular more, and it is even more to distribute, and its reinforcing degree is high more.
Therefore, the single crystal super alloy after the solution treatment must obtain certain volume mark and size through ageing treatment γ ' mutually.But the aging treatment method by routine is difficult to obtain ideal γ ' phase volume fraction and size simultaneously, and the γ ' phase that obtain suitable dimension also needs the very long treatment time.
Summary of the invention
Purpose of the present invention provides a kind of more simple and superior single crystal super alloy aging treatment method at the deficiency that existing technology exists.
For achieving the above object, the present invention realizes by the following technical solutions:
To be connected to through the single crystal super alloy two ends after the solution treatment on direct supply the two poles of the earth earlier, put into the chamber type electric resistance furnace internal heating to the timeliness treatment temp, open the power supply that connects single crystal super alloy then, make galvanic current pass through single crystal super alloy, under galvanic action, carry out ageing treatment.Current density is 0.1-150A/cm
2(preferred range is 5-90A/cm
2), aging temperature is the use temperature of alloy, soaking time is 10-100 hour (preferred range is 10-64 hour).
The ageing treatment device of single crystal super alloy under a kind of galvanic current, this device comprises direct supply, heat tracing system, sample and lead, direct supply forms series loop by lead and sample, the heat tracing system comprises body of heater, heating unit and thermopair, sample places on the intravital sample table of stove, by the heating unit heat supply, pass through thermocouple temperature measurement.
The ag(e)ing process of superalloy is the growth process of γ ' phase, and growing up of γ ' phase is subjected to the diffusion control of its forming element, and the forming element diffusion is fast more, and the speed of growth of γ ' phase is just big more, and the ageing treatment time is just short more.Under the galvanic current effect, by the interaction between moving electron and alloy atom, promoted the diffusion of atom, thereby promoted that γ ' grows up mutually, shorten the ageing treatment time.Therefore, under the galvanic current effect, can under the short period, carry out ageing treatment, obtain the γ ' phase of suitable dimension single crystal super alloy.In addition, the galvanic current ageing treatment can also improve γ ' phase volume fraction, obtains regular shape, the γ ' phase that is evenly distributed.
The present invention compared with prior art has the following advantages:
1, can promote growing up of γ ', shorten the treatment time.As the size of a kind of nickel-base high-temperature single crystal alloy γ ' phase when carrying out electric ageing treatment for 870 ℃, compared greatly 1/2nd with conventional processing.
2, can improve the volume fraction of γ ' phase.As the volume fraction of a kind of nickel-base high-temperature single crystal alloy γ ' phase when carrying out electric ageing treatment for 870 ℃, comparing with conventional processing has increased by three percentage points.
3, can make γ ' phase pattern rule more, it is more even to distribute.
4, in the single crystal super alloy treating processes, apply galvanic current, can obviously promote the growth of strengthening phase γ ' in the single crystal super alloy, improve tissue.
5, the present invention has simple, easy to operate, the advantage such as handle that quality height, treatment time are lacked, cut down the consumption of energy of equipment, can be applicable in the ageing treatment of single crystal super alloy.
Description of drawings
Fig. 1 is the ageing treatment setting drawing of single crystal super alloy under the galvanic current.Among the figure, 1 direct supply; 2 leads; 3 thermopairs; 4 bodies of heater; 5 heating units; 6 sample table; 7 samples.
Fig. 2 is the pattern comparison diagram mutually of the γ ' after electric ageing treatment and the conventional ageing treatment (not applying galvanic current).
Embodiment
Below in conjunction with drawings and Examples the present invention is elaborated.
Fig. 1 is the ageing treatment setting drawing of single crystal super alloy under the galvanic current of the present invention.As can be seen from Figure 1, the galvanic current ageing treatment device of the present invention's employing is made up of two portions: first part is an electric field action device, is made up of direct supply 1, lead 2, sample table 6 and sample 7.Its effect is that sample is connected with direct supply, and sample is under the galvanic current effect, and range of current is 0.05-60A.Second section is the heat tracing system, is made up of body of heater 4, heating unit 5 and thermopair 3.The effect of this part is heating and insulation sample, and temperature range is 800-1200 ℃.
DD3 nickel-base high-temperature single crystal alloy rod after the solution treatment is connected on voltage stabilized source the two poles of the earth, put into the chamber type electric resistance furnace internal heating to the timeliness treatment temp, open the power supply that connects single crystal super alloy then, make galvanic current pass through single crystal super alloy, under galvanic action, carry out ageing treatment.Current density is 20A/cm
2, holding temperature is 870 ℃, soaking time is 32 hours.
Fig. 2 provides nickel-base high-temperature single crystal alloy DD3 to adopt γ ' pattern comparison diagram mutually after the present invention and the conventional ageing treatment, and Fig. 2 a is the γ ' phase photo after the conventional ageing treatment (not applying galvanic current), and Fig. 2 b is for applying 20A/cm
2γ ' phase photo after the galvanic current ageing treatment.The size that contrasts γ ' phase among visible Fig. 2 b is bigger than Fig. 2 a's, and pattern is more regular, so the galvanic current ageing treatment has promoted growing up of γ ' phase, makes γ ' phase pattern rule more, and it is more even to distribute.
Difference from Example 1 is:
Nickel-base high-temperature single crystal alloy is DD3, and current density is 5A/cm
2, holding temperature is 850 ℃, soaking time is 100 hours.
Difference from Example 1 is:
Nickel-base high-temperature single crystal alloy is DD8, and current density is 50A/cm
2, holding temperature is 1090 ℃, soaking time is 24 hours.
Difference from Example 1 is:
Nickel-base high-temperature single crystal alloy is CMSX-10, and current density is 100A/cm
2, holding temperature is 1070 ℃, soaking time is 50 hours.
Difference from Example 1 is:
Nickel-base high-temperature single crystal alloy is CMSX-10, and current density is 150A/cm
2, holding temperature is 1150 ℃, soaking time is 10 hours.
Compare with conventional ageing treatment, the galvanic current ageing treatment has promoted growing up of γ ' phase, makes γ ' phase pattern rule more, and it is more even to distribute.
Claims (5)
1, a kind of electric ageing treatment process of single crystal super alloy, it is characterized in that: will be connected to through the single crystal super alloy two ends after the solution treatment on direct supply the two poles of the earth earlier, put into chamber type electric resistance furnace, be heated to aging temperature, open the power supply that connects single crystal super alloy then, make galvanic current pass through single crystal super alloy, under galvanic action, carry out ageing treatment.
2, the electric ageing treatment process of single crystal super alloy according to claim 1 is characterized in that: the superalloy ageing treatment under the galvanic current effect, current density are 0.1-150A/cm
2
3, the electric ageing treatment process of single crystal super alloy according to claim 2 is characterized in that: described current density preferred range is 5-90A/cm
2
4, the electric ageing treatment process of single crystal super alloy according to claim 1 is characterized in that: electric aging temperature is the use temperature of alloy, and soaking time is 10-100 hour.
5, the electric ageing treatment process of single crystal super alloy according to claim 4 is characterized in that: described soaking time preferred range is 10-64 hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100478476A CN100400681C (en) | 2005-11-28 | 2005-11-28 | Electric ageing treatment process of high temperature monocrystalline alloy |
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|---|---|---|---|
| CNB2005100478476A CN100400681C (en) | 2005-11-28 | 2005-11-28 | Electric ageing treatment process of high temperature monocrystalline alloy |
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| CN1974801A true CN1974801A (en) | 2007-06-06 |
| CN100400681C CN100400681C (en) | 2008-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198605A (en) * | 2016-08-04 | 2016-12-07 | 中国科学院金属研究所 | The method of evaluating performance of single crystal super alloy under a kind of special environment |
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| JPS6273155A (en) * | 1985-09-27 | 1987-04-03 | Tokuyama Soda Co Ltd | Characteristic improving method of oxygen sensor |
| WO1997048644A1 (en) * | 1996-06-17 | 1997-12-24 | Thermometrics, Inc. | Growth of nickel-cobalt-manganese oxide single crystals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198605A (en) * | 2016-08-04 | 2016-12-07 | 中国科学院金属研究所 | The method of evaluating performance of single crystal super alloy under a kind of special environment |
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