CN1036077C - Method for improving medium-temperature constancy of rolling ferri-trialuminum based intermetallic compound alloy - Google Patents
Method for improving medium-temperature constancy of rolling ferri-trialuminum based intermetallic compound alloy Download PDFInfo
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- CN1036077C CN1036077C CN93121243A CN93121243A CN1036077C CN 1036077 C CN1036077 C CN 1036077C CN 93121243 A CN93121243 A CN 93121243A CN 93121243 A CN93121243 A CN 93121243A CN 1036077 C CN1036077 C CN 1036077C
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Abstract
The present invention relates to a method for improving the medium-temperature enduring quality of a rolling Fe3Al based intermetallic compound alloy. The intermetallic compound alloy comprises the components by atomic percentage: 26 to 30% of Al, 2 to 10% of Cr and Fe as the rest, and the intermetallic compound alloy can also comprises a small amount of Mo and a micro amount of Nb, Zr, B, C, etc. The method comprises the following specific preparing processes: an alloy is rolled into a thin board with the thickness of 2mm at the temperature of 1000 DEG C to 650 DEG C, and the amount of cold work is 60%; the rolling alloy is annealed at the temperature of 1000 DEG C to 1300 DEG C, the holding time is from 0.5 hour to 3 hours; and then, the rolling alloy is cooled with oil. The endurance life of the rolling alloy reaches more than 2000 hours under the stress conditions of the temperature of 600 DEG C and the pressure of 200MPa through the thermal treatment.
Description
The invention relates to a kind of improvement and roll attitude Fe
3The method of Al base intermetallic compound alloy medium-temperature constancy.
Fe
3The cost that Al base intermetallic compound alloy is cheap, extremely good anti-oxidant, anti-curability, higher specific tenacity have caused the extensive attention of Chinese scholars, are expected to replace stainless steel in some field and are applied in middle high-temperature corrosion environment.Yet low the restriction to commercialization of temperature-room type plasticity difference and middle hot strength developed.Therefore, the work of current stage is conceived to improve its temperature-room type plasticity and middle high temperature instantaneous strength.Control Fe by alloying and heat processing technique
3Al base intermetallic compound alloy at room temperature plasticity can be stabilized in 10-20%, and the intensity in the time of 600 ℃ can reach 500MPa, [US.5084109,1992,2; Acta Metallurgica Sinica, 1993, Vol29, A354-A358].At Fe
3After Al base intermetallic compound alloy at room temperature performance and medium temperature intensity improved, creep rupture life, difference became its significant obstacle to the commercialization development, (593 ℃, 207 MPa) Fe under the middle temperature
3The only 2-5 hour creep rupture life of Al base intermetallic compound alloy [J.Mater.Res., 1991, Vol6, P1779-P1805], middle like this high temperature has can't bring into play its good corrosion resistance under the ambient stress condition.Therefore improve Fe
3The work of the medium-temperature constancy of Al base intermetallic compound alloy is imperative.
In recent years, U.S.'s Oak Ridge National Laboratory (ORNL) adopts alloyage process, by adding alloying element such as carbide forming element Nb, Zr etc., solution strengthening elements Mo, Fe
3Obtained improvement to a certain degree the creep rupture life of Al base intermetallic compound alloy.Enduring quality sees Table 1.Its concrete technology is as follows: alloy adopts arc melting, 1000 ℃-600 ℃ to be rolled into the thin plate of 0.76mm, add 500 ℃ of orderings in five days through 850 ℃-hour again handles.As known from Table 1, the Fe-28Al-5Cr-0.8Nb-0.5Mo-0.1Zr-0.05B alloy has obtained plasticity (＞10%) and has cooperated preferably creep rupture life.All the other alloys are but not too satisfactory, and temperature-room type plasticity alloy preferably is lower creep rupture life, and creep rupture life higher its temperature-room type plasticity extreme difference (＜5%) of alloy.Therefore, although alloying has been improved Fe to a certain extent
3The medium-temperature constancy of Al base intermetallic compound alloy, but other performance is caused disadvantageous effect.Temperature-room type plasticity variation as described above, the increase of alloy smelting difficulty etc.C.G.McKamey etc. also point out Fe
3The creep rupture life of Al base intermetallic compound alloy is also very responsive to the composition of alloy, and alloy ingredient is controlled will become improper creep rupture life very poor [DE92016018,92] slightly.Crystal grain can significantly improve Fe although hot mechanical treatment obtains the sheet elongation
3Al base intermetallic compound alloy at room temperature intensity and plasticity but do not have help to the improvement of enduring quality.
The objective of the invention is to propose a kind of technology simple, be easy to control but the obvious results method, to obtain to roll attitude Fe
3Al base intermetallic compound alloy temperature-room type plasticity and medium-temperature constancy cooperate preferably.Both made Fe
3Al base intermetallic compound alloy has good room temperature processing characteristics, has higher medium temperature intensity and creep rupture life again.
Technical scheme of the present invention is that to adopt a kind of new method for annealing be that big crystal grain is handled and improved Fe
3The medium-temperature constancy of Al base intermetallic compound alloy.Fe
3Al base intermetallic compound alloy obtains through vacuum metling, vacuum casting.After 24 hours, at 1000-650 ℃ of thin plate that is rolled into 2mm, the cold working amount is 60% to ingot casting 1000 ℃ of homogenizing diffusion annealings.The concrete involved Fe of the present invention
3The composition (in atomic percent) of Al base intermetallic compound alloy: Al:26-30%; Cr:2-10%, micro-carbide forming element Nb, Zr and a small amount of solid solution element Mo also can contain little clearance element B, C, surplus Fe.Improve and roll attitude Fe
3The concrete technology of the medium-temperature constancy of Al base intermetallic compound alloy is: annealed oil quenching 0.5 hour～3 hours for 1000-1300 ℃.Table 1, Fe
3Al base intermetallic compound alloy at room temperature tensile property and 600
℃, the enduring quality under the 200MPa condition.(composition of alloy with
The atomic percent meter)
* the concrete composition of FA-130 alloy is: Fe-28Al-5Cr-0.5Mo-0.5Nb0.1Zr-0.05B
| Enduring quality | Room-temperature property | |||
| Alloy | Creep rupture life (hour) | ε％ | σ s(MPa) | ε％ |
| Fe-28Al | 2 | 34 | 393 | 4.3 |
| Fe-28Al-2Mo- 0.1Zr | 208 | 55 | 698 | 5.7 |
| Fe-28Al-5Cr- 0.1Zr-0.05B | 13 | 49 | 480 | 16.4 |
| The FA-130 alloy * | 202 | 61 | 554 | 12.6 |
In under the high temperature the high and recrystallization temperature of crystal boundary migration rate to hang down be to cause Fe
3The major reason that Al base intermetallic compound alloy enduring quality is low (J.Mater.Res, 1992, Vo117, P2089-2106).High crystal boundary migration rate easily makes crystal boundary stress generation slip down outside under the middle high temperature, germinates crackle prematurely, causes reduce creep rupture life; And recrystallization temperature is low, and it is softening that intermetallic alloy answer or recrystallize are taken place, and can reduce creep rupture life equally.The present invention is a base alloy with Fe-(26-30 atom %) Al-(2-10 atom %) Cr, at binary Fe
3On the basis that Al intermetallic compound temperature-room type plasticity makes moderate progress, add Alloy Elements Mo, Nb, Zr, C etc. and strengthen matrix with high temperature endurance performance in improving.The Alloy Elements Mo solid solution is in Fe
3In the Al intermetallic compound base body, play the solution strengthening effect, and improve about 20-50 ℃ of intermetallic Fe-Al compound recrystallization temperature.In addition, also improve DO
3→ B2 transition temperature.And the interpolation of Nb, Zr, C alloying element then can form the diffusion carbide particle and further strengthen matrix.These factors all can help the raising of creep rupture life.Adopt heat treating regime of the present invention, help growing up of crystal grain and reduce number of grain boundaries, cause the raising of creep rupture life.If temperature control suitably, Fe
3The plasticity of Al base intermetallic compound alloy also can remain on 10% level, so both can keep Fe
3Al base intermetallic compound alloy has good room temperature processing characteristics, can make it again to be applied in middle high-temperature corrosion environment.Therefore this thermal treatment process has certain practical significance.Be Fe
3The application of Al base intermetallic compound alloy creates favorable conditions.
Embodiment: tested alloys composition (in atomic percent) is respectively: 28%Al, 5%Cr, surplus Fe; 28%Al, 5%Cr, 0.1%Zr, 0.05%B, surplus Fe; 28%Al, 5%Cr, 0.1%Zr, 0.5%Mo, 0.5%Nb, 0.05%B, surplus Fe.Alloy adopts the vacuum induction melting vacuum casting to become the ingot casting (preheating temperature of mold is 200-600 ℃) of 5Kg, and ingot casting after 24 hours, 1000-850 ℃ of hot rolling, becomes the thin plate of 2mm through 1000 ℃ of homogenizing diffusion annealings at last at 600-650 ℃ of warm-rolling.Lasting sample is of a size of 15 * 4 * 2mm along rolling to cutting
3The polishing polishing is after 1 hour oil quenching of 1000 ℃ of annealing or 2 hours oil quenchings of 1250 ℃ of annealing.The rupture test condition is: 600 ℃, and 200MPa.Under the above-mentioned processing condition, roll attitude Fe
3The enduring quality of Al base intermetallic compound alloy sees Table 2.Table 3 is Fe
3The enduring quality of Al base intermetallic compound alloy and room temperature tensile performance.Although the hot mechanical treatment of B2 can significantly improve Fe
3Al base intermetallic compound alloy at room temperature performance, the room temperature unit elongation reaches 10-20%, and the nearly 500MPa of intensity can compare favourably with some stainless steel, yet this heat treating method can not improve Fe
3The creep rupture life of Al base intermetallic compound alloy, what creep rupture life was best also is no more than 50 hours, and this alloy can't be played a role in actual production.The method that adopts the present invention as shown in Table 2 and taked, be improved largely creep rupture life.Brought up to 9.7 hour by original 1.8 hours the creep rupture life of Fe-28Al-5Cr alloy, particularly Fe-28Al-5Cr-0.1Zr-0.05B (hereinafter to be referred as Fe-28Al-5CrZrB) and Fe-28 Al-5 Cr-0.1Zr-0.5 Mo-0.5 Nb-0.05B (hereinafter to be referred as Fe-28 Al-5 CrZrMoNbB) alloy adopt thermal treatment process of the present invention, the effect of improving creep rupture life is more remarkable, respectively by 3.0 hours behind the hot mechanical treatment of B2, brought up to 222 hours in 20 hours, more than 2000 hour, and the room temperature tensile performance test shows: Fe-28Al-5Cr-0.1 Zr-0.05B alloy at room temperature unit elongation can remain on 10.4%, and intensity is that 365MPa shows and adopts thermal treatment process of the present invention not only can significantly improve Fe
3Also can keep its good temperature-room type plasticity the creep rupture life of Al base intermetallic compound alloy.In sum, attitude Fe is rolled in the present invention's improvement
3The method of Al base intermetallic compound alloy medium-temperature constancy, not only simple but also effect is remarkable.Fe after table 2, the employing thermal treatment process of the present invention
3The enduring quality of Al base intermetallic compound alloy (200MPa, 600 ℃).
Annotate: oq
*The expression oil quenching, 2096+222+259 hour,
#Represent lasting sample at 200MPa, through 2096 hours, 220MPa, 600 ℃ did not rupture through 216 hours, again at 240MPa, just ruptured through 259 hours under 600 ℃ of conditions under 600 ℃ of conditions.Table 3, behind the hot mechanical treatment of B2 Fe
3Al base intermetallic compound alloy at room temperature tensile property and creep rupture life.
| Alloy | Heat treating regime | Creep rupture life | ε％ |
| Fe-28Al-5Cr | 1100℃/1h，oq * | 9.7 hour | 28.2 |
| Fe-28Al-5CrZrB | 1100℃/1h，oq | 222 hours | 14.8 |
| Fe-28Al- 5CrZrMoNbB | 1250℃/h，oq | 259 hours # of 2096+216+ | 8.2 |
| Room-temperature property | Enduring quality | |||
| Alloy | σ s(MPa) | ε％ | Life-span (h) | ε％ |
| Fe-28Al-5Cr | 345 | 16.8 | 1.8 | 55.5 |
| Fe-28Al-5CrZrB | 520 | 19.1 | 3.0 | 44.6 |
| Fe-28Al- 5CrZrMoNbB | 530 | 14.1 | 20.0 | 45.7 |
Claims (1)
1, attitude Fe is rolled in a kind of improvement
3The method of the medium-temperature constancy of Al base intermetallic compound alloy is characterized in that this Fe
3The composition range of Al base intermetallic compound alloy is (in atomic percent): Al:26-30%, Cr:2-10%, surplus is Fe, the ingot casting of this alloy obtains through vacuum metling, vacuum casting, ingot casting is 1000 ℃ of homogenizing diffusion annealings after 24 hours, at 1000 ℃～650 ℃ thin plates that are rolled into 2mm, the cold working amount is 60%, with the above-mentioned attitude Fe that rolls
3Al base intermetallic compound alloy is annealed, and annealing temperature is 1000 ℃-1300 ℃, and soaking time is 0.5 hour-3 hours, then oil quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93121243A CN1036077C (en) | 1993-12-30 | 1993-12-30 | Method for improving medium-temperature constancy of rolling ferri-trialuminum based intermetallic compound alloy |
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|---|---|---|---|
| CN93121243A CN1036077C (en) | 1993-12-30 | 1993-12-30 | Method for improving medium-temperature constancy of rolling ferri-trialuminum based intermetallic compound alloy |
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| CN1094095A CN1094095A (en) | 1994-10-26 |
| CN1036077C true CN1036077C (en) | 1997-10-08 |
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| CN93121243A Expired - Fee Related CN1036077C (en) | 1993-12-30 | 1993-12-30 | Method for improving medium-temperature constancy of rolling ferri-trialuminum based intermetallic compound alloy |
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| US7405555B2 (en) * | 2005-05-27 | 2008-07-29 | Philip Morris Usa Inc. | Systems and methods for measuring local magnetic susceptibility including one or more balancing elements with a magnetic core and a coil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158744A (en) * | 1990-07-07 | 1992-10-27 | Asea Brown Boveri Ltd. | Oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide, Fe3 Al |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158744A (en) * | 1990-07-07 | 1992-10-27 | Asea Brown Boveri Ltd. | Oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide, Fe3 Al |
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| CN1094095A (en) | 1994-10-26 |
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