CN103060610A - A casting method for the preparation of thin-wall blades by using a titanium alloy containing trace amount of carbon - Google Patents
A casting method for the preparation of thin-wall blades by using a titanium alloy containing trace amount of carbon Download PDFInfo
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- CN103060610A CN103060610A CN2012105799717A CN201210579971A CN103060610A CN 103060610 A CN103060610 A CN 103060610A CN 2012105799717 A CN2012105799717 A CN 2012105799717A CN 201210579971 A CN201210579971 A CN 201210579971A CN 103060610 A CN103060610 A CN 103060610A
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Abstract
A casting method for the preparation of thin-wall blades by using a titanium alloy containing trace amount of carbon is provided. The titanium alloy consists of the following substances by weight ratio: 44.0 - 48.0 of Al, 5.0-9.0 of niobium, 0.1-0.5 of carbon, and the balance being titanium and unavoidable trace impurities. According to the weight ratio, performing two times of melting with argon filling in a vacuum induction furnace to the titanium alloy, with argon gas pressure controlled at 60000Pa; after the titanium alloy is melted, determining contents of each of the substances before unloading from the furnace, stirring for another 2 minutes and unloading from the furnace for cooling to obtain a titanium alloy ingot; and then placing the titanium alloy ingot in a melting furnace for melting under a vacuum degree of 3.5Pa, then casting thin-wall blades with a thickness between 0.6 mm and1 .0 mm and attached test coupons by using the melted titanium alloy, by a equivalent test method, mechanics performance testing can be performed to the attached test coupons of the same heat, which indicates that the tensile strength is equal to or greater than 225MPa, the elongation is equal to or greater than 16% and the casting yield is equal to or greater than 90% at a temperature of 1000-1100 DEG C.
Description
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Technical field
The invention belongs to the titanium aluminum alloy technical field, especially a kind of titanium aluminum alloy of trace carbon that contains is for the preparation of the casting method of thin wall vane.
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Background technology
The relevant titanium aluminium Ti Al alloy that is used for thin wall vane has been studied more, be the high niobium Nb titanium aluminum alloy that CN101056998A discloses a kind of Ti-45Al-5 Nb-2Mo such as the patent No., this alloy is separated out the γ phase in inside mutually at β, to such an extent as to the β size distribution is very meticulous, but strengthening effect is not obvious mutually between each element in this alloy, owing to do not add the high temperature creep strengthening elements such as silicon Si or carbon C, cause the cast member use temperature of this alloy lower, can not satisfy the tensile strength requirement of blade in the time of 1000 ~ 1100 ℃ of turbine engine, wall thickness owing to blade requires to be controlled between 0.6 ~ 1.0mm simultaneously, and the existence of Mo element can reduce this alloy in the flowing property in when casting, and casting fluidity can relatively poor titanium aluminum alloy can not be used for casting thin wall vane.
A kind of titanium aluminum alloy of the MITSUBISHI HEAVY IND LTD JP5320791 of company patent disclosure is: 34 ~ 52 Ti, 40 ~ 46 Al, 3 ~ 8 Cr, and 5 ~ 12 Nb, this titanium aluminum alloy has significantly reduced the casting fluidity energy owing to added the chromium Cr of high-content.Although this titanium aluminum alloy has higher hot strength and high-temperature oxidation resistance, can not be used for casting thin wall vane.
The another kind of titanium aluminum alloy of JP2000199025 patent disclosure is: 44.5 ~ 48.5 Al, 5 ~ 9.5 Nb, 0.5 ~ 2 Cr, 0.1 ~ 0.4Si, 0.1 ~ 0.4Ni, all the other are Ti, although the content of Cr can affect not obviously in this titanium aluminum alloy on casting fluidity, Si wherein and nickel have then reduced the casting fluidity energy.Although this titanium aluminum alloy also has higher hot strength and high-temperature oxidation resistance, can not be used for casting thin wall vane.
As everyone knows, titanium aluminum alloy has relatively poor casting fluidity energy, and the minimum wall thickness (MINI W.) of thin wall vane is controlled at 0.6 ~ 1.0mm usually, if increase the working efficiency that wall thickness can significantly reduce turbo-supercharger, along with improving constantly of the motor performance such as Aeronautics and Astronautics, automobile, naval vessel, performance to titanium aluminum alloy is had higher requirement, and the thin-wall part that is namely cast out by titanium aluminum alloy should have higher intensity, antioxidant property and lighter density etc.Intensity embodies by tensile strength usually, namely tensile strength can not＜200MPa, the work-ing life of higher its thin-wall part of tensile strength is longer; Antioxidant property embodies by use temperature usually, and the use temperature general control is between 1000 ~ 1100 ℃.In other words between 1000 ~ 1100 ℃ and have tensile strength 〉=200MPa and have good casting fluidity can titanium aluminum alloy just can be used for casting the thin wall vane of turbine engine, but the titanium aluminum alloy that contains trace carbon yet there are no relevant report for the preparation of the casting method of thin wall vane.
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Summary of the invention
For addressing the above problem, the invention provides a kind of titanium aluminum alloy of trace carbon that contains for the preparation of the casting method of thin wall vane, this titanium aluminum alloy that contains trace carbon is fit to the thin wall vane of cast engine very much, this is to have preferably casting fluidity energy because contain the titanium aluminum alloy of trace carbon, the thin wall vane that casts out through melting can be between 1000 ~ 1100 ℃ life-time service and tensile strength 〉=225MPa, the wall thickness of thin wall vane can be controlled between 0.6 ~ 1.0mm.
For achieving the above object, the present invention adopts following technical scheme:
A kind of titanium aluminum alloy of trace carbon that contains is for the preparation of the casting method of thin wall vane, contain by weight percentage 44.0 ~ 48.0 aluminium, 5.0 ~ 9.0 niobium, surplus titanium and inevitable trace impurity in the described titanium aluminum alloy, feature of the present invention is: also contain by weight percentage 0.1 ~ 0.5 carbon in the described titanium aluminum alloy, described titanium aluminum alloy total proportioning by weight percentage is constructed as follows:
Aluminium 44.0 ~ 48.0, niobium 5.0 ~ 9.0, carbon 0.1 ~ 0.5 and surplus titanium and inevitable trace impurity;
Aluminium described above adds in the proportioning in the mode of fine aluminium;
Niobium described above adds in the proportioning in the mode of niobium aluminium, but wherein the aluminium content in the niobium aluminium is included among the described aluminium;
Carbon described above adds in the proportioning in the mode of pure carbon;
Titanium described above adds in the proportioning in the mode of titanium sponge;
By above-mentioned each proportioning and together put into and carry out the argon filling melting in the vacuum induction furnace, the pressure-controlling of argon gas is at 60000 Pa, after melting, make each assay of stokehold, the restir cooling of coming out of the stove in 2 minutes obtained just refining titanium aluminum alloy ingot casting after each assay satisfied described total proportioning and consists of, again described just refining titanium aluminum alloy ingot casting is relay and in vacuum induction furnace, carry out the argon filling melting, this moment, the pressure of argon gas still was controlled at 60000 Pa, the stokehold redeterminates its each content whether satisfy described total proportioning and consist of after the restir cooling of coming out of the stove in 2 minutes obtain the titanium aluminum alloy ingot casting; Described titanium aluminum alloy ingot casting put in the smelting furnace melt, the suction of smelting furnace is controlled at 3.5Pa, until whole fusing and continuously stirring thin wall vane and the attached test coupon of wall thickness between 0.6 ~ 1.0mm that be used for after 2 minutes casting of described titanium aluminum alloy ingot casting, because thin wall vane is the curved surface shape and is difficult to
It is carried out Mechanics Performance Testing, can carry out Mechanics Performance Testing to the described attached test coupon with heat by the equality testing method, tensile strength 〉=225MPa, the unit elongation 〉=16 %s of described attached test coupon between 1000 ~ 1100 ℃ after tested, the qualified casting of thin-walled turbine blade 〉=90 %.
The preferred weight per distribution ratio of described titanium aluminum alloy is constructed as follows:
Aluminium 45.0 ~ 47.0, niobium 6.0 ~ 8.0, carbon 0.2 ~ 0.4 and surplus titanium and inevitable trace impurity.
The preferred weight per distribution ratio of described titanium aluminum alloy is constructed as follows:
Aluminium 46.0, niobium 7.0, carbon 0.3 and surplus titanium and inevitable trace impurity.
By adopting technique scheme, the present invention has following beneficial effect:
1, the present invention contains the titanium aluminum alloy of trace carbon, the thin wall vane that is fit to very much wall thickness between 0.6 ~ 1.0mm of cast engine, have preferably high temperature creep property and casting fluidity energy because contain the titanium aluminum alloy of trace carbon, so that the qualified casting of thin wall vane 〉=95 %, reduce the casting cost, increased work-ing life.
2, because thin wall vane can obtain life-time service and tensile strength 〉=230MPa between 1000 ~ 1100 ℃, therefore significant to the performance that improves the engines such as Aeronautics and Astronautics, automobile, naval vessel, market outlook are very good.
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Embodiment
The present invention is that a kind of titanium aluminum alloy of trace carbon that contains is for the preparation of the casting method of thin wall vane, the titanium aluminum alloy that contains trace carbon is fit to the turbine blade of wall thickness between 0.6 ~ 1.0mm of cast engine very much, have preferably high temperature creep property and casting fluidity energy because contain the titanium aluminum alloy of trace carbon, so that the qualified casting of thin-walled turbine blade 〉=95 %, reduce the casting cost, increased work-ing life.
Contain 44.0 ~ 48.0 aluminium, 5.0 ~ 9.0 niobium, surplus titanium and inevitable trace impurity in the described titanium aluminum alloy by weight percentage, the content of titanium aluminium and niobium all is conventional formulation of this area.
But difference of the present invention is: also contain by weight percentage 0.1 ~ 0.5 carbon in above-mentioned titanium aluminum alloy, the C of different content can exert an influence to the casting fluidity of titanium aluminum alloy, the content of research C is matter of utmost importance of the present invention, and the titanium aluminum alloy total proportioning by weight percentage that therefore contains trace carbon is constructed as follows:
Aluminium 44.0 ~ 48.0, niobium 5.0 ~ 9.0, carbon 0.1 ~ 0.5 and surplus titanium and inevitable trace impurity, wherein said aluminium adds in the proportioning in the mode of fine aluminium, wherein said niobium adds in the proportioning in the mode of niobium aluminium but the aluminium content in the niobium aluminium is included among the described aluminium, wherein said carbon adds in the proportioning in the mode of pure carbon, and wherein said titanium adds in the proportioning in the mode of titanium sponge.
The titanium aluminum alloy that the present invention contains trace carbon is compared with MITSUBISHI HEAVY IND LTD house journal, Cr, Ni, Si element have been removed, added the C of 0.1 ~ 0.5 weight part, not only do not affect casting fluidity energy of the present invention, simultaneously significantly improve again hot strength of the present invention and high temperature creep property, can in titanium aluminum alloy, form Ti because C content is controlled at 0.1 ~ 0.5 o'clock
2The AlC compound, this Ti
2The AlC compound can play the effect of solution strengthening, hot strength and creep strengthening effect be significantly better than Cr, Ni, Si element, this for the thin-walled turbine blade of casting wall thickness 0.6 ~ 1.0mm and satisfy that life-time service under 1000 ~ 1100 ℃ of hot environments provides may.
When C content was lower than 0.1, the synusia refining effect in the microstructure was not obvious, did not have the effect that improves high temperature creep property and improve hot strength; When C content is higher than 0.5, can obviously reduce castability of the present invention.
When Nb content is controlled at 6.0-8.0, can avoid or a-segregation, β-segregation and S segregation seldom occur, thereby improve homogeneity of the present invention and reliability, improve the safety coefficient of foundry goods.Be in the segregation that the β in the lamella group forms mutually and be called the a-segregation, be in the segregation that the β of lamella group grain boundaries forms mutually and be called β-segregation, the S segregation is rich Al, low Nb.
Casting method of the present invention must consist of in conjunction with above-mentioned total proportioning, by above-mentioned each proportioning and together put into and carry out the argon filling melting in the vacuum induction furnace, the pressure-controlling of argon gas is at 60000 Pa, after melting, make each assay of stokehold, the restir cooling of coming out of the stove in 2 minutes obtained just refining titanium aluminum alloy ingot casting after each assay satisfied described total proportioning and consists of, again described just refining titanium aluminum alloy ingot casting is relay and in vacuum induction furnace, carry out the argon filling melting, this moment, the pressure of argon gas still was controlled at 60000 Pa, the stokehold redeterminates its each content whether satisfy described total proportioning and consist of after the restir cooling of coming out of the stove in 2 minutes obtain the titanium aluminum alloy ingot casting; Described titanium aluminum alloy ingot casting put in the smelting furnace melt, the suction of smelting furnace is controlled at 3.5Pa, until described titanium aluminum alloy ingot casting all fusing and continuously stirring be used for after 2 minutes casting wall thickness between 0.6 ~ 1.0mm thin wall vane and
Attached test coupon, the scantlings of the structure of thin wall vane does not provide in addition, and the blade of thin wall vane point place thickness is about between 0.6 ~ 1.0mm and the diameter of turbine only has 50mm in general.Because thin wall vane is the curved surface shape and is difficult to it is carried out Mechanics Performance Testing, can carry out Mechanics Performance Testing to the described attached test coupon with heat by the equality testing method, described equality testing method is the habitual a kind of control methods in this area, because the material of thin wall vane and the titanium aluminum alloy that contains trace carbon of attached test coupon casting usefulness, to melt environment be consistent.Tensile strength 〉=225MPa, the unit elongation 〉=16 %s of described attached test coupon between 1000 ~ 1100 ℃ after tested, the qualified casting of thin wall vane 〉=90 %.
The preferred weight per distribution ratio of described titanium aluminium base alloy is constructed as follows:
Aluminium 45.0 ~ 47.0, niobium 6.0 ~ 8.0, carbon 0.2 ~ 0.4 and surplus titanium and inevitable trace impurity.
The preferred weight per distribution ratio of described titanium aluminium base alloy is constructed as follows:
Aluminium 46.0, niobium 7.0, carbon 0.3 and surplus titanium and inevitable trace impurity.
The present invention has also provided 6 kinds of concrete proportionings in following table except said ratio consists of, the casting test-results of 6 kinds of concrete proportionings is as follows.
The implication of Ti-44.0Al-5Nb-0.3C is in the upper table 1: aluminium 44.0, niobium 5.0, carbon 0.3 and surplus titanium and inevitable trace impurity.The implication of upper table 2 ~ 6 can be explained with reference to this.
Thin wall vane requires at high temperature carry load, tensile strength between 1000 ~ 1100 ℃ is necessary 〉=200MPa, less demanding to unit elongation, and as can be seen from the above table: from the tensile strength between room temperature to 1000 ~ 1100 ℃ all greater than 225MPa, maximum value in the time of 1100 ℃ even can reach 255MPa, much larger than 200MPa, satisfied the service requirements of the engines such as Aeronautics and Astronautics, automobile, naval vessel.
By the solidification theory analysis, the route that solidifies that the present invention contains the titanium aluminum alloy of trace carbon carries out β and solidifies mutually, and the material composition after the casting is even, and crystal grain is tiny and even.By adding that micro-C can significantly improve hot strength but can not affect the moulding of casting thin wall vane, so relative background technology of the present invention, tensile strength between 1000 ~ 1100 ℃ and unit elongation are very high and numerical values recited is even, have satisfied equally the service requirements of the engines such as Aeronautics and Astronautics, automobile, naval vessel.
The embodiment that selects in this article in order to disclose purpose of the present invention currently thinks to suit, but will be appreciated that, the present invention is intended to comprise that all belong to all changes and the improvement of the interior embodiment of this design and the scope of the invention.
Claims (3)
1. one kind contains the titanium aluminum alloy of trace carbon for the preparation of the casting method of thin wall vane, contain by weight percentage 44.0 ~ 48.0 aluminium, 5.0 ~ 9.0 niobium, surplus titanium and inevitable trace impurity in the described titanium aluminum alloy, it is characterized in that: also contain by weight percentage 0.1 ~ 0.5 carbon in the described titanium aluminum alloy, described titanium aluminum alloy total proportioning by weight percentage is constructed as follows:
Aluminium 44.0 ~ 48.0, niobium 5.0 ~ 9.0, carbon 0.1 ~ 0.5 and surplus titanium and inevitable trace impurity;
Aluminium described above adds in the proportioning in the mode of fine aluminium;
Niobium described above adds in the proportioning in the mode of niobium aluminium, but wherein the aluminium content in the niobium aluminium is included among the described aluminium;
Carbon described above adds in the proportioning in the mode of pure carbon;
Titanium described above adds in the proportioning in the mode of titanium sponge;
By above-mentioned each proportioning and together put into and carry out the argon filling melting in the vacuum induction furnace, the pressure-controlling of argon gas is at 60000 Pa, after melting, make each assay of stokehold, the restir cooling of coming out of the stove in 2 minutes obtained just refining titanium aluminum alloy ingot casting after each assay satisfied described total proportioning and consists of, again described just refining titanium aluminum alloy ingot casting is relay and in vacuum induction furnace, carry out the argon filling melting, this moment, the pressure of argon gas still was controlled at 60000 Pa, the stokehold redeterminates its each content whether satisfy described total proportioning and consist of after the restir cooling of coming out of the stove in 2 minutes obtain the titanium aluminum alloy ingot casting; Described titanium aluminum alloy ingot casting put in the smelting furnace melt, the suction of smelting furnace is controlled at 3.5Pa, until whole fusing and continuously stirring thin wall vane and the attached test coupon of wall thickness between 0.6 ~ 1.0mm that be used for after 2 minutes casting of described titanium aluminum alloy ingot casting, because thin wall vane is the curved surface shape and is difficult to
It is carried out Mechanics Performance Testing, can carry out Mechanics Performance Testing to the described attached test coupon with heat by the equality testing method, tensile strength 〉=225MPa, the unit elongation 〉=16 %s of described attached test coupon between 1000 ~ 1100 ℃ after tested, the qualified casting of thin-walled turbine blade 〉=90 %.
2. described a kind of titanium aluminum alloy of trace carbon that contains is for the preparation of the casting method of thin wall vane according to claim 1, and it is characterized in that: the preferred weight per distribution ratio of described titanium aluminum alloy is constructed as follows:
Aluminium 45.0 ~ 47.0, niobium 6.0 ~ 8.0, carbon 0.2 ~ 0.4 and surplus titanium and inevitable trace impurity.
3. described a kind of titanium aluminum alloy of trace carbon that contains is for the preparation of the casting method of thin wall vane according to claim 1 and 2, and it is characterized in that: the preferred weight per distribution ratio of described titanium aluminum alloy is constructed as follows:
Aluminium 46.0, niobium 7.0, carbon 0.3 and surplus titanium and inevitable trace impurity.
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| CN2012105799717A CN103060610A (en) | 2012-12-28 | 2012-12-28 | A casting method for the preparation of thin-wall blades by using a titanium alloy containing trace amount of carbon |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521704A (en) * | 2013-10-20 | 2014-01-22 | 王文姣 | Method for casting blade |
| CN105274392A (en) * | 2015-10-26 | 2016-01-27 | 鲁东大学 | Method for manufacturing turbine blade of automobile turbocharger |
| CN105803257A (en) * | 2016-04-14 | 2016-07-27 | 南京理工大学 | Method for improving liquid-state fluidity of TiAl-Nb alloy |
| CN116516212A (en) * | 2023-03-23 | 2023-08-01 | 北京科技大学 | Preparation method of high-temperature high-strength high-Nb-TiAl alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276021A (en) * | 1997-08-19 | 2000-12-06 | Gkss研究中心盖斯特哈赫特有限公司 | Alloy based on titanium aluminides |
| CN102268568A (en) * | 2011-08-02 | 2011-12-07 | 洛阳双瑞精铸钛业有限公司 | TiAl-based alloy with excellent high temperature oxidation resistance and creep resistance suitable for casting |
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2012
- 2012-12-28 CN CN2012105799717A patent/CN103060610A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276021A (en) * | 1997-08-19 | 2000-12-06 | Gkss研究中心盖斯特哈赫特有限公司 | Alloy based on titanium aluminides |
| CN102268568A (en) * | 2011-08-02 | 2011-12-07 | 洛阳双瑞精铸钛业有限公司 | TiAl-based alloy with excellent high temperature oxidation resistance and creep resistance suitable for casting |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521704A (en) * | 2013-10-20 | 2014-01-22 | 王文姣 | Method for casting blade |
| CN103521704B (en) * | 2013-10-20 | 2015-06-03 | 吴小江 | Method for casting blade |
| CN105274392A (en) * | 2015-10-26 | 2016-01-27 | 鲁东大学 | Method for manufacturing turbine blade of automobile turbocharger |
| CN105803257A (en) * | 2016-04-14 | 2016-07-27 | 南京理工大学 | Method for improving liquid-state fluidity of TiAl-Nb alloy |
| CN105803257B (en) * | 2016-04-14 | 2017-05-17 | 南京理工大学 | Method for improving liquid-state fluidity of TiAl-Nb alloy |
| CN116516212A (en) * | 2023-03-23 | 2023-08-01 | 北京科技大学 | Preparation method of high-temperature high-strength high-Nb-TiAl alloy |
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Application publication date: 20130424 |