CN106399858B - A kind of low-density Ti3Al enhancing unimach and preparation method thereof - Google Patents
A kind of low-density Ti3Al enhancing unimach and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of low-density Ti3Al enhancing unimach and preparation method thereof, belongs to metal material field.The chemical composition mass percent of the steel is：C 0.5 1.5wt%, Mn 15 30wt%, Al 5 10wt%, Ti 5 20wt%, Cr≤5wt%, Nb≤0.2wt%, Si≤2wt%, B≤0.6wt%, remaining is Fe and inevitable impurity.The present invention forms Ti by adding Ti elements3Al, precipitation strength is together produced with κ~carbide, steel is had the intensity of superelevation and good plasticity concurrently while density is effectively reduced, tensile strength reaches more than 1350MPa, and for elongation percentage up to more than 10%, density is 6.5 6.9g/cm3, the manufacture demand of automobile structure can be met.
Description
Technical field
The present invention relates to a kind of low-density Ti3Al enhancing unimach and preparation method thereof.Belong to metal material field.
Background technology
With the increasingly popularization of energy-saving and emission-reduction green idea, mitigate automotive dead weight has turned into the theme of current market development.
Common iron is substituted using high strength steel, the specific strength (intensity and density ratio) of steel can be improved, so as to ensure mechanical property
While reduce needed for steel plate thickness, realize vehicle body loss of weight.The method that another kind effectively improves steel specific strength is to maintain
By adding alloy in lightweight element al while high intensity, the density of steel is reduced.This approach can further improve steel
Specific strength, therefore exploitation have concurrently high intensity and low-density steel be realize it is light-weighted it is urgent needed for.
The main design thought of low density steel is to reduce the density of steel by adding Al elements, then by adding Mn, C etc.
Other alloying elements carry out optimizing components, with reference to rational preparation technology, obtain the high-strength steel of low-density.Mainly use at present
Component system is Fe-Mn-Al-C systems, and tensile strength can only achieve 1200MPa, and density is up to 6.8g/cm3。
It is the subject matter that Fe-Mn-Al-C systems low density steel faces further to improve intensity.A kind of solution route is
Other alloying elements are added, intensity is improved using solution strengthening or precipitation strength.A kind of existing low-density high-ductility NiAl increases
Strong unimach, NiAl mainly is formed to improve the tensile strength of steel by addition Ni elements, reaches its tensile strength
More than 1350MPa, but Ni density is 8.9g/cm3, higher than the density (7.8g/cm of steel3), it is unfavorable for reducing the close of steel
Degree.Accordingly, it is desirable to provide one kind also can further reduce the Fe-Mn-Al-C systems steel of density while possessing superhigh intensity.
The content of the invention
In view of this, an object of the present invention is to provide a kind of low-density Ti3Al strengthens unimach, the superelevation
Strength steel is remarkably improved tensile strength while density is effectively reduced, and keeps good plasticity, can meet vehicle structure
The manufacture demand of part.The second object of the present invention is to provide a kind of low-density Ti3Al strengthens the preparation side of unimach
Method.
To realize the purpose of the present invention, following technical scheme is now provided：
A kind of low-density Ti3Al strengthens unimach, and its chemical composition mass percent is：C 0.5-1.5 wt%,
Mn 15-30wt%, Al 5-10wt%, Ti 5-20wt%, Cr≤5wt%, Nb≤0.2wt%, Si≤2wt%, B≤
0.6wt%, remaining is Fe and inevitable impurity.
A kind of low-density Ti of the present invention3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：Weighed by the chemical composition mass percent of unimach of the present invention and choose raw material, carried out true
Empty melting：Raw material is fitted into stove, is evacuated to vacuum<During 50Pa, heating makes that raw material is completely melt and weld pool surface is without gas
After bubble overflows, in vacuum<1Pa, it is incubated -2 hours 30 minutes when temperature is 1600-1700 DEG C and is refined, after abundant deoxidation
Alloying is carried out under argon gas protection, then pours into a mould and cooling obtains steel ingot under vacuo；Remelting is carried out again：Steel ingot is put into stove
It is interior, lead to argon gas protection, pressure 100-150Pa, be heated to being incubated 2-5 hours after being completely melt, cooling obtains the steel after remelting
Ingot.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is not higher than 600 DEG C, is 1160- in temperature
At 1220 DEG C, 8-20 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100-1180 DEG C, and final forging temperature is
900-1000 DEG C, room temperature is cooled in atmosphere, obtains forging stock.
(4) it is heat-treated：Forging stock is subjected to solution treatment：In the case where temperature is 1050-1200 DEG C, 1-3 hours are incubated, are being quenched
Room temperature is cooled in oil；Ageing Treatment is carried out again：In the case where temperature is 450-650 DEG C, 3-10 hours are incubated, are cooled down in atmosphere
To room temperature, a kind of low-density Ti3Al enhancings unimach is obtained.
Preferably, vacuum melting uses vaccum sensitive stove.
Preferably, from vacuum consumable remelting or the method for electroslag remelting during remelting.
Beneficial effect
(1) a kind of low-density Ti of the present invention3Al strengthens unimach, and the steel grade density is 6.5-6.9g/cm3,
Tensile strength reaches more than 1350MPa, and elongation percentage can meet the manufacture demand of automobile structure more than 10%.
(2) a kind of low-density Ti of the present invention3Al strengthens the preparation method of unimach, and this method is by adding Ti
Element, form Ti3Al, precipitation strength is together produced with κ-carbide, to improve the tensile strength of steel, simultaneously because Ti density
Only 4.5g/cm3, hence it is evident that less than steel (7.8g/cm3), therefore adding Ti can also effectively reduce the density of steel.
The composition design of the present invention is according to as follows：
C：C main function is to form κ-carbide ((Fe, Mn) with Mn and Al elements3AlC), precipitation strength is formed, is carried
Gao Gang intensity.C or important solution strengthening element, can promote austenitic formation, while advantageously reduce density.Contain with Al
Amount increase, can gradually form ferrite, if now C content is relatively low, the content of austenite can be made relatively low with stability, cause to extend
Rate is relatively low.Increase with C content, the intensity and elongation percentage of steel can all be lifted, but too high C content can result in it is thick
κ-carbide, κ-carbide of grain boundaries is especially distributed across, elongation percentage will be significantly reduced.Therefore, C content of the invention is
0.5-1.5%.
Mn：Mn is among the austenite stabilizing elements, and Mn main function is to promote matrix austenitizing.Austenite structure can make steel
Higher work hardening rate is kept, improves plasticity；The work hardening ability of steel can also be improved, improves intensity, therefore adding Mn has
Coordinate beneficial to good strong plasticity is obtained.But when Mn contents are higher, with the increase of Mn contents, workpiece is in quick heating and cooled
Tearing tendency increase in journey.Therefore, Mn contents of the invention are 15-30%.
Al：Al density is 2.7g/cm3, be reduce steel density essential element.Al another main function is and Ti
Combine to form Ti3Al phases, while the component for also serving as κ-carbide promotes the formation of κ-carbide.Al content is too low to be led
Cause can not form enough Ti3Al and κ-carbide, but too high Al content can cause B2 and DO3Type ordered phase occurs, and reduces steel
Plasticity.In addition, Al is ferrite former, with the increase of its content, ferritic structure is gradually formed in matrix, suppresses Ovshinsky
Body is formed, and makes the intensity of steel increase and plasticity reduction.Al content is too high to also result in κ-carbide and Ti3Al is roughened, hence it is evident that drop
Low elongation.So Al content of the invention is 5-10%.
Ti：Ti addition mainly forms Ti with Al3Al phases, precipitation strength is produced jointly with κ-carbide, improves steel
Intensity.Ti also has low density feature, and the density of steel can be together reduced with Al.Easily and C, N element combines Ti, therefore need to add foot
The Ti of amount can just obtain Ti3Al phases.The TiC that Ti and C, N are combined to form, TiN being capable of fining austenite grains, it may have separate out strong
Change acts on.In the present invention, Ti contents are 5-20%.
Embodiment
The invention will be further described in conjunction with the embodiments.
Tensile test equipment：Model INSTRON5985 electronic universal material testing machine (U.S.'s Instron)；
Tensile strength testing standard in embodiment：GB/T228-2002；Tensile strength, yield strength and elongation percentage are by drawing
The tensile stress-strain curve for stretching experiment gained is measured by GB/T228-2002.
Vaccum sensitive stove is the ZG-0.05 vaccum sensitive stoves of Jinzhou Zhong Zhen electric furnaces Co., Ltd production；Electroslag furnace is
0.5 ton of atmosphere protection electroslag furnace of Shanghai Kai Yue automation equipments Co., Ltd production.According to a kind of low-density Ti of the present invention3Al
Strengthen the chemical composition ranges of unimach, prepare 39 kilograms of the stove of alloy pig 7.
Table 1 is the chemical composition mass percent (wt%) of the unimach made from the embodiment of the present invention.
Table 1
| Embodiment | Heat (batch) number | C/wt% | Mn/wt% | Al/wt% | Ti/wt% | Cr/wt% | Nb/wt% | Si/wt% | B/wt% |
| 1 | 1# | 0.8 | 30 | 8 | 5 | 5 | - | 0.5 | - |
| 2 | 2# | 0.5 | 22 | 10 | 20 | 4 | 0.1 | - | 0.1 |
| 3 | 3# | 1.0 | 15 | 9 | 12 | 4 | 0.1 | 1.1 | 0.3 |
| 4 | 4# | 1.2 | 28 | 5 | 10 | 5 | - | 1.9 | 0.4 |
| 5 | 5# | 1.3 | 27 | 9 | 12 | 3 | 0.1 | 0.8 | - |
| 6 | 6# | 1.3 | 27 | 8 | 10 | 4 | - | - | 0.3 |
| 7 | 7# | 1.5 | 25 | 9 | 15 | 5 | 0.2 | 0.2 | 0.2 |
Continued 1
| Embodiment | Heat (batch) number | P/wt% | S/wt% | O/wt% | N/wt% | Fe/wt% |
| 1 | 1# | 0.003 | 0.004 | 0.0019 | 0.0020 | Surplus |
| 2 | 2# | 0.002 | 0.004 | 0.0017 | 0.0022 | Surplus |
| 3 | 3# | 0.004 | 0.003 | 0.0010 | 0.0030 | Surplus |
| 4 | 4# | 0.003 | 0.004 | 0.0012 | 0.0025 | Surplus |
| 5 | 5# | 0.0035 | 0.004 | 0.0010 | 0.0030 | Surplus |
| 6 | 6# | 0.004 | 0.0035 | 0.0015 | 0.0020 | Surplus |
| 7 | 7# | 0.0035 | 0.004 | 0.0010 | 0.0030 | Surplus |
Embodiment 1
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 11#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
30 minutes are incubated at 1700 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 100Pa, power transmission adds
Heat, gradually increase input power to 84kW, keep the power 5 hours, be completely melt steel ingot, after finally cooling obtains remelting
Steel ingot.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1160 DEG C in temperature
When, 20 hours are incubated, cools to room temperature with the furnace, the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100 DEG C, final forging temperature 900
DEG C, room temperature is cooled in atmosphere, and forging obtains forging stock, and forging stock is size：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon, then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1050 DEG C, 3 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 450 DEG C, 10 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens superelevation
The tensile sample blank of strength steel.
Embodiment 2
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 12#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
30 minutes are incubated at 1700 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：By steel ingot be put into electroslag furnace, lead to argon gas protection, pressure 120Pa, power transmission adds
Heat, gradually increase input power to steel ingot during 87.5kW and be completely melt, keep the power 2 hours, be completely melt steel ingot, finally
Cooling obtains the steel ingot after remelting.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 580 DEG C, is 1220 DEG C in temperature
When, 8 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1180 DEG C, final forging temperature 1000
DEG C, room temperature is cooled in atmosphere, obtains forging stock, and forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：Temperature is at 1200 DEG C, is incubated 1 hour, room temperature is cooled in quenching oil；Ageing Treatment is carried out again：
In the case where temperature is 650 DEG C, 3 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens superhigh intensity
The tensile sample blank of steel.
Embodiment 3
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 13#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
1.5 hours are incubated at 1650 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 150Pa, power transmission adds
Heat, gradually increase input power to steel ingot during 86kW and be completely melt, keep the power 3 hours, be completely melt steel ingot, it is last cold
But the steel ingot after remelting is obtained.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1190 DEG C in temperature
When, 15 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1140 DEG C, final forging temperature 950
DEG C, room temperature is cooled in atmosphere and obtains forging stock, and forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1070 DEG C, 2 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 550 DEG C, 7 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al enhancings superelevation is strong
Spend the tensile sample blank of steel.
Embodiment 4
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 14#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
30 minutes are incubated at 1700 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 150Pa, power transmission adds
Heat, gradually increase input power to steel ingot during 87kW and be completely melt, keep the power 4 hours, be completely melt steel ingot, it is last cold
But the steel ingot after remelting is obtained.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1160 DEG C in temperature
When, 20 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100 DEG C, final forging temperature 900
DEG C, room temperature is cooled in atmosphere, obtains forging stock, and the forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1050 DEG C, 3 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 450 DEG C, 10 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens superelevation
The tensile sample blank of strength steel.
Embodiment 5
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 15#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
30 minutes are incubated at 1700 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 150Pa, power transmission adds
Heat, gradually increase input power to steel ingot during 87kW and be completely melt, keep the power 4 hours, be completely melt steel ingot, it is last cold
But the steel ingot after remelting is obtained.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1160 DEG C in temperature
When, 20 hours are incubated, room temperature is cooled to the furnace, obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100 DEG C, final forging temperature 900
DEG C, room temperature is cooled in atmosphere, obtains forging stock, and the forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1050 DEG C, 3 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 450 DEG C, 10 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens superelevation
The tensile sample blank of strength steel.
Embodiment 6
A kind of preparation method of low-density Ti3Al enhancings unimach, specifically includes following steps：
(1) smelt：By in table 16#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
30 minutes are incubated at 1700 DEG C to be refined, alloying is carried out under argon gas protection after abundant deoxidation, are then poured into a mould and in vacuum
Lower cooling, obtains steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 100Pa, power transmission adds
Heat, gradually increase input power to steel ingot during 85kW and be completely melt, keep the power 5 hours, be completely melt steel ingot, it is last cold
But the steel ingot after remelting is obtained.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1160 DEG C in temperature
When, 20 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100 DEG C, final forging temperature 900
DEG C, room temperature is cooled in atmosphere, obtains forging stock, and the forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1050 DEG C, 3 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 450 DEG C, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens the stretching of unimach
Sample blank.
Embodiment 7
A kind of low-density Ti3Al strengthens the preparation method of unimach, specifically includes following steps：
(1) smelt：By in table 17#The chemical composition mass percent of the unimach corresponding to stove, which weighs, to be chosen
Raw material, vacuum melting is carried out first：Raw material is fitted into vaccum sensitive stove, when being evacuated to vacuum ＜ 50Pa, power transmission heating,
Gradually increase input power, to raw material be completely melt and weld pool surface bubble-free overflow after, be ＜ 1Pa in vacuum, temperature is
Be incubated 30 minutes at 1700 DEG C to be refined, alloying carried out in the case where argon gas does protection gas after abundant deoxidation, then cast and
Cooled down under vacuum, obtain steel ingot；Remelting is carried out again：Steel ingot is put into electroslag furnace, leads to argon gas protection, pressure 100Pa, power transmission
Heating, gradually increase input power to steel ingot during 84kW and be completely melt, keep the power 5 hours, be completely melt steel ingot, finally
Cooling obtains the steel ingot after remelting.
(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is 550 DEG C, is 1160 DEG C in temperature
When, 20 hours are incubated, room temperature is cooled to the furnace and obtains the steel ingot after Homogenization Treatments.
(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100 DEG C, final forging temperature 900
DEG C, room temperature is cooled in atmosphere, obtains forging stock, and the forging stock is that size is：Coupon.
(4) it is heat-treated：Sample section is sent to process to obtain tensile sample blank first the coupon.Then by tensile sample hair
Base carries out solution treatment：In the case where temperature is 1050 DEG C, 3 hours are incubated, room temperature is cooled in quenching oil；Carry out again at timeliness
Reason：In the case where temperature is 450 DEG C, 10 hours are incubated, room temperature is cooled in atmosphere, obtains a kind of low-density Ti3Al strengthens superelevation
The tensile sample blank of strength steel.
By the obtained tensile sample blank in embodiment 1~7 through grinding into cross-sectional diameter d be 5mm, it is former
Beginning gauge length L0For 25mm standard proportional tensile sample, progress Mechanics Performance Testing is as shown in table 2, wherein σbRepresent tensile strength,
σ0.2Yield strength is represented, A represents elongation percentage.
Table 2
| Embodiment | Heat (batch) number | σb/MPa | σ0.2/MPa | A/% | Density/(g/cm3) |
| 1 | 1# | 1350 | 1200 | 19 | 6.8 |
| 2 | 2# | 1370 | 1215 | 18 | 6.5 |
| 3 | 3# | 1410 | 1270 | 13 | 6.7 |
| 4 | 4# | 1400 | 1280 | 17 | 6.9 |
| 5 | 5# | 1455 | 1320 | 16 | 6.6 |
| 6 | 6# | 1440 | 1300 | 16 | 6.7 |
| 7 | 7# | 1480 | 1320 | 15 | 6.5 |
Claims (2)
- A kind of 1. low-density Ti3Al strengthens unimach, it is characterised in that：The chemical composition mass percent of the steel is：C 0.5-1.5wt%, Mn 15-30wt%, Al 5-10wt%, Ti 5-20wt%, Cr≤5wt%, Nb≤0.2wt%, Si≤ 2wt%, B≤0.6wt%, remaining is Fe and inevitable impurity；The steel is prepared with the following method, and specific steps are such as Under：(1) smelt：Vacuum melting is carried out first：Raw material is fitted into stove, is evacuated to vacuum<During 50Pa, heating makes raw material It is completely melt and after weld pool surface bubble-free spilling, in vacuum<1Pa, insulation is 30 minutes -2 small when temperature is 1600-1700 DEG C Shi Jinhang is refined, and alloying is carried out under argon gas protection after abundant deoxidation, then pours into a mould and cooling obtains steel ingot under vacuo；Again Carry out remelting：Steel ingot is put into stove, leads to argon gas protection, pressure 100-150Pa, it is small to be heated to insulation 2-5 after being completely melt When, cooling obtains the steel ingot after remelting；(2) Homogenization Treatments：The steel ingot after remelting is loaded in stove when temperature is not higher than 600 DEG C, is 1160-1220 in temperature DEG C when, be incubated 8-20 hours, cool to room temperature with the furnace and obtain the steel ingot after Homogenization Treatments；(3) forge：Steel ingot after Homogenization Treatments is forged, initial forging temperature is 1100-1180 DEG C, final forging temperature 900- 1000 DEG C, room temperature is cooled in atmosphere, obtains forging stock；(4) it is heat-treated：Forging stock is subjected to solution treatment：In the case where temperature is 1050-1200 DEG C, 1-3 hours are incubated, in quenching oil It is cooled to room temperature；Ageing Treatment is carried out again：In the case where temperature is 450-650 DEG C, 3-10 hours are incubated, are cooled to room in atmosphere Temperature, obtain a kind of low-density Ti3Al enhancings unimach.
- A kind of 2. low-density Ti according to claim 13Al strengthens unimach, it is characterised in that：Vacuum melting is adopted Use vaccum sensitive stove；From vacuum consumable remelting or the method for electroslag remelting during remelting.
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