CN1743482A - High strength low cost titanium and method for making same - Google Patents
High strength low cost titanium and method for making same Download PDFInfo
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- CN1743482A CN1743482A CN200510077410.7A CN200510077410A CN1743482A CN 1743482 A CN1743482 A CN 1743482A CN 200510077410 A CN200510077410 A CN 200510077410A CN 1743482 A CN1743482 A CN 1743482A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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Abstract
A titanium alloy and method of making the same are provided. The alloy comprises one or more elements selected from the group consisting of chromium, iron, and manganese. In an as-cast condition, the alloy has a yield strength of at least about 135,000 psi, a tensile strength of at least about 155,000 psi and a percent elongation of at least about 5.0 percent.
Description
Invention field
The present invention relates generally to titanium alloy, more specifically, the present invention relates to new titanium alloy and preparation method thereof, and it can be by the titanium preparation of reclaiming.
Background technology
Titanium alloy has attracting physicals and mechanical property concurrently, and this makes them become ideal material in the application that needs high strength, low-gravity, good corrosion resistance.Yet, titanium alloy production cost costliness, this has seriously limited their application.Titanium refine from its raw material be come out, becoming the available form needs many procedure of processings.In addition, because its high reactivity characteristic, refining technique must carefully be controlled, and this has further increased manufacturing cost.As a result, the application of titanium is confined to the military vehicles usually, aircraft engine and framework of fuselage (air-frame) parts, chemical treatment apparatus and physical culture device.
People expect to reduce production costs with the titanium that reclaims.Yet, the titanium that utilize to reclaim limited in one's ability.In order to obtain desired intensity and ductility, the oxygen level of most of medium tenacitys and high strength titanium alloy is limited in the 0.2wt.% of weight alloy usually.This lower oxygen level restriction order uses recovery titanium material to become difficult.In reclaiming technology, during in fusion with postcooling, the titanium material is exposed in the air, the result, and when reclaiming, they very easily absorb oxygen and other interstitial element at every turn.
As a result, the demand of new titanium alloy and preparation method thereof is arisen at the historic moment.
Summary of the invention
According to an aspect of the present invention, provide a kind of titanium alloy.This titanium alloy comprises that titanium and one or more are selected from the element of chromium, manganese and iron, and wherein under as cast condition, the yield strength of this titanium alloy is at least about 135,000psi.
Preferably, this titanium alloy comprises and accounts for titanium alloy weight at the aluminium of about 3.5wt.% to the scope of about 6.25wt.%, more preferably at about 4.5wt.% extremely in about 6.0wt.% scope, particularly preferably in about 5.0wt.% extremely in the scope of about 6.0wt.%.In a kind of preferred embodiment, this titanium alloy comprises that accounting for titanium alloy weight is about 3.0wt.% to the interior vanadium of about 4.5wt.% scope, more preferably to the scope of about 4.5wt.%, preferred especially vanadium is at about 3.5wt.% extremely in the scope of about 4.5wt.% at about 3.3wt.% for vanadium.According to another kind of preferred embodiment, the content of chromium accounts in the scope that is up to about 3.8wt.% of titanium alloy weight, and more preferably to the scope of about 2.5wt.%, special preferred chromium is at about 1.2wt.% extremely in the scope of about 2.0wt.% at about 1.0wt.% for chromium.In other embodiments, the content of manganese in accounting for the scope that is up to about 2.0wt.% of titanium alloy weight, more preferably in being up to the scope of about 1.5wt.%, particularly preferably in about 0.75wt.% to the scope of about 1.25wt.%.Iron is preferably in accounting for the scope that is up to about 1.0wt.% of titanium alloy weight.
In other preferred embodiment, this titanium alloy comprises that accounting for titanium alloy weight is up to oxygen in the scope of about 0.3wt.%, more preferably in being up to the scope of about 0.29wt.%, in the scope that is up to about 0.27wt.%.Further preferably, the total amount of chromium, manganese and iron at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%, more preferably at about 1.0wt.% extremely in the scope of about 4.5wt.%, particularly preferably in about 2.0wt.% extremely in the scope of about 3.5wt.%.
Preferably, the tensile strength of described titanium alloy is at least 155,000psi, and the percentage unit elongation is at least 5.0%.
According to a further aspect in the invention, provide a kind of titanium alloy, this titanium alloy comprises that accounting for titanium alloy weight is about 3.5wt.% to the interior aluminium of about 6.25wt.% scope, accounts for titanium alloy weight and is about 3.0wt.% to the interior vanadium of about 4.5wt.% scope; And one or more are selected from the element of chromium, iron and manganese, wherein said one or more elements account for titanium alloy weight about 1.0% to about 5.0% scope.Titanium exists with surplus, and under as cast condition, preferably the yield strength of this titanium alloy is at least about 135,000psi.
The content of aluminium more preferably at the about 4.5wt.% that accounts for titanium alloy weight to about 6.0wt.% scope, particularly preferably in about 5.0wt.% extremely in the scope of about 6.0wt.%.The content of vanadium is more preferably accounting for the about 3.3wt.% of titanium alloy weight to the scope of about 4.5wt.%, particularly preferably in about 3.5wt.% extremely in the scope of about 4.5wt.%.The content of chromium is more preferably accounting for the about 1.0wt.% of titanium alloy weight to the scope of about 2.5wt.% in accounting for the scope that titanium alloy weight is up to about 3.8wt.%, particularly preferably in about 1.2wt.% extremely in the scope of about 2.0wt.%.The content of manganese in accounting for the scope that titanium alloy weight is up to about 2.0wt.%, more preferably in being up to the scope of about 1.5wt.%, particularly preferably in about 0.75wt.% to the scope of about 1.25wt.%.The content of iron is in accounting for the scope that titanium alloy weight is up to about 1.0wt.%.The content of oxygen is preferably in accounting for the scope that titanium alloy weight is up to about 0.3wt.%, more preferably in being up to the scope of about 0.29wt.%, particularly preferably in being up in about 0.27wt.% scope.Preferably, the tensile strength of this titanium alloy is at least about 155,000psi, and the percentage unit elongation is at least about 5.0%.
Preferably, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%.
According to a further aspect of the invention, a kind of titanium alloy is provided, it comprises and accounts for the chromium that titanium alloy weight is up to about 3.8wt.%, accounts for the iron that titanium alloy weight is up to about 1.0wt.%, accounts for titanium alloy weight at the manganese of about 0.75wt.% to about 1.25wt.% scope.Wherein, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%.Titanium exists with surplus.
Preferably, this titanium alloy comprises that further accounting for described titanium alloy weight is up to the interior oxygen of about 0.3wt.% scope.Comprise that also the about 3.5wt.% that accounts for described titanium alloy weight is to the interior aluminium of about 6.25wt.% scope.Comprise that also the about 3.0wt.% that accounts for described titanium alloy weight is to the interior vanadium of about 4.5wt.% scope.The total content of preferred chromium, manganese and iron at the about 2.0wt.% that accounts for described titanium alloy weight to the scope of about 3.5wt.%.Under as cast condition, the yield strength of described titanium alloy is at least about 135,000psi.Under as cast condition, the tensile strength of described titanium alloy is at least about 155,000psi.Under as cast condition, the percentage unit elongation of described titanium alloy is at least about 5.0%.
According to a further aspect of the invention, provide a kind of titanium alloy, it comprises and accounts for titanium alloy weight at the aluminium of about 3.5wt.% to about 6.25wt.% scope; Account for titanium alloy weight at the vanadium of about 3.0wt.% to about 4.5wt.% scope; Account for the chromium that titanium alloy weight is up to about 3.8wt.%; Account for the manganese that titanium alloy weight is up to about 2.0wt.%; Account for the iron that titanium alloy weight is up to about 1.0wt.%; Account for titanium alloy weight greater than the oxygen of about 0.2wt.% to about 0.3wt.% scope.Titanium exists with surplus.Wherein, the gross weight of chromium, manganese and iron at the about 2.0wt.% that accounts for titanium alloy weight to the scope of about 3.5wt.%.
Preferably, the content of aluminium at the about 5.0wt.% that accounts for described titanium alloy weight to the scope of about 6.0wt.%.The content of vanadium at the about 3.3wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%.The content of manganese is in accounting for the scope that is up to about 1.5wt.% of described titanium alloy weight.More preferably the content of manganese at the about 0.75wt.% that accounts for described titanium alloy weight to the scope of about 1.25wt.%.Preferably the content of chromium at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 2.5wt.%.Under as cast condition, the yield strength of described titanium alloy is at least about 135,000psi.Under as cast condition, the percentage unit elongation of described titanium alloy is at least about 5.0%.Under as cast condition, the tensile strength of described titanium alloy is at least about 155,000psi.Described alloy also comprises, accounts for the nitrogen in about 0.05wt.% scope of being up to of described titanium alloy weight.Also comprise, account for the carbon in about 0.1wt.% scope of being up to of described titanium alloy weight.Also comprise, other element, wherein the content of each described other element is up in the scope of about 0.1wt.% accounting for described titanium alloy weight, and the total content of described other element is in accounting for the scope that is up to about 0.4wt.% of described titanium alloy weight.
According to another aspect of the present invention, provide a kind of method for preparing titanium alloy.This method comprises, the titanium material is mixed with one or more elements that are selected from chromium, manganese and iron, and wherein, under as cast condition, the yield strength of this titanium alloy is at least about 135,000psi.In a kind of preferred embodiment, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%.In other preferred embodiment, the gross weight of chromium, iron and manganese at the about 2.0wt.% that accounts for titanium alloy weight to the scope of about 3.5wt.%.
Preferably, this titanium alloy comprises that accounting for titanium alloy weight is up to the interior oxygen of about 0.3wt.% scope.More preferably, the content of the oxygen weight that accounts for titanium alloy is higher than about 0.2wt.%.In another kind of preferred embodiment, the content of manganese in accounting for the scope that is up to about 2wt.% of titanium alloy weight, more preferably the content of manganese at the about 0.75wt.% that accounts for titanium alloy weight to the scope of about 1.25wt.%.In other preferred embodiment, the content of chromium is in accounting for about 3.8wt.% scope of being up to of titanium alloy weight, more preferably at about 1.0wt.% extremely in the scope of about 2.5wt.%.In other preferred embodiment, the content of iron is in accounting for the scope that is up to about 1.0wt.% of titanium alloy weight.
In preferred embodiments, the titanium material is the titanium material that reclaims.In other preferred embodiment, the titanium material is the Ti-6Al-4V material.
In another other preferred embodiment, the titanium material is the commercial pure titanium material.This embodiment also comprises the step with aluminium and described titanium material mixing, wherein, the content of aluminium at the about 3.5wt.% that accounts for described titanium alloy weight to the scope of about 6.25wt.%.This embodiment also comprises, with the step of vanadium and described titanium material mixing, wherein, the content of vanadium at the about 3.0wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%.Described titanium material is the Ti-3Al-2.5V material.
In another other preferred embodiment, the titanium material is the Ti-3Al-2.5V material.This embodiment also comprises the step with aluminium and described titanium material mixing, and wherein, the content of aluminium in described titanium alloy is accounting for about 3.5wt.% of described titanium alloy weight to the scope of about 6.25wt.%.This embodiment comprises that also with the step of vanadium and described titanium material mixing, wherein, the content of vanadium in described titanium alloy is accounting for about 3.0wt.% of described titanium alloy weight to the scope of about 4.5wt.%.
In another other preferred embodiment, described titanium material comprises that the about 3.5wt.% that accounts for described titanium alloy weight is to the interior aluminium of about 6.25wt.% scope.Described titanium material comprises that the about 3.0wt.% that accounts for described titanium alloy weight is to the interior vanadium of about 4.5wt.% scope.Under as cast condition, the tensile strength of described alloy is at least about 155,000psi.Under as cast condition, the percentage unit elongation of described alloy is at least about 5.0%.
According to additional aspects of the present invention, a kind of method for preparing titanium alloy is provided, it comprises: the titanium material is provided; With this titanium material is mixed with manganese, chromium and iron, make the content of manganese in titanium alloy at the about 0.75wt.% that accounts for titanium alloy weight to the scope of about 1.25wt.%, the content of chromium in titanium alloy is in accounting for the scope that titanium alloy weight is up to about 3.8wt.%, the content of iron in titanium alloy is in accounting for the scope that is up to about 1.0wt.% of titanium alloy weight, wherein, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%.
Preferably, described titanium material comprises that the about 3.5wt.% that accounts for described titanium alloy weight is to the interior aluminium of about 6.25wt.% scope.Described titanium material comprises that the about 3.0wt.% that accounts for described titanium alloy weight is to the interior vanadium of about 4.5wt.% scope.Described titanium material comprises commercial pure titanium, and according to method in this respect, described method further comprises the step with aluminium and described titanium material mixing, wherein, the content of aluminium at the about 3.5wt.% that accounts for described titanium alloy weight to the scope of about 6.25wt.%.Described method further comprises the step with vanadium and described titanium material mixing, wherein, the content of vanadium at the about 3.0wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%.
According to another aspect of the present invention, a kind of method for preparing titanium alloy is provided, it comprises: the titanium material is provided, described titanium material comprises that the about 3.5wt.% that accounts for described titanium alloy weight is to the interior aluminium of about 6.25wt.% scope, account for described titanium alloy weight and be up to the interior oxygen of about 0.3wt.% scope, the about 3.0wt.% that accounts for described titanium alloy weight is to the interior vanadium of about 4.5wt.% scope; Described titanium material is mixed with manganese, chromium and iron, the content of wherein said manganese in described titanium alloy is accounting for about 0.75wt.% of described titanium alloy weight to the scope of about 2.0wt.%, the content of described chromium in described titanium alloy is accounting for described titanium alloy weight and is being up in the scope of about 3.8wt.%, the content of described iron in described titanium alloy is accounting in the scope that is up to about 1.0wt.% of described weight alloy, wherein, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 5.0wt.%.
Preferably, the gross weight of chromium, iron and manganese at the about 2.0wt.% that accounts for described titanium alloy weight to the scope of about 3.5wt.%.The content of preferred chromium at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 2.5wt.%.Under as cast condition, the yield strength of described titanium alloy is at least about 135,000psi.Under as cast condition, the tensile strength of described titanium alloy is at least about 155,000psi.Under as cast condition, the percentage unit elongation of described titanium alloy is at least about 5.0%.
According to another aspect of the invention, provide a kind of titanium alloy, it comprises; Aluminium, its at the about 3.5wt.% that accounts for described titanium alloy weight to the scope of about 6.25wt.%; Vanadium, its at the about 3.5wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%; Iron, it is in accounting for the scope that is up to about 1.0wt.% of described titanium alloy weight; Chromium, it is in accounting for the scope that is up to about 3.8wt.% of described titanium alloy weight; Manganese, its at the about 0.75wt.% that accounts for described titanium alloy weight to the scope of about 2.0wt.%; Oxygen, it is in accounting for the scope that is up to about 0.3wt.% of described titanium alloy weight; And titanium, exist with surplus; Wherein, the gross weight of chromium, iron and manganese at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 5.0wt.%.
Preferably, the content of chromium at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 2.5wt.%.Alloy also comprises existing titanium material, and described existing titanium material is the titanium material that reclaims.Preferably, the total content of vanadium, manganese and iron at the about 2.0wt.% that accounts for described titanium alloy weight to the scope of about 3.5wt.%.Under as cast condition, the yield strength of described titanium alloy is at least about 135,000psi.Under as cast condition, the tensile strength of described titanium alloy is at least about 155,000psi.Under as cast condition, the percentage unit elongation of described titanium alloy is at least about 5.0%.
Embodiment
The present invention relates to can be by the titanium alloy of the commercial titanium alloy manufacturing of reclaiming.Described in table 1, in order to keep ideal or desired intensity and ductility, the oxygen level of commercial titanium alloy is limited in the 0.2wt.% that is no more than titanium alloy weight usually.
Table 1-conventional titanium alloy
| Alloy | Al | V | Mo | Sn | Zr | Cr | Fe | Mn | O |
| Ti-6Al- 4V | 5.5- 6.75 | 3.5- 4.5 | The highest by 0.3 | The highest by 0.2 | |||||
| Ti-6Al- 2Sn-2Mo- 2Zr-2Cr | 5.25- 6.25 | 1.75- 2.25 | 1.75- 2.25 | 1.75- 2.25 | 1.75- 2.25 | The highest by 0.13 | |||
| Ti-6Al- 2Sn-4Zr- 6Mo | 5.5- 6.5 | 5.5- 6.5 | 1.75- 2.25 | 3.5- 4.5 | The highest by 0.15 | The highest by 0.15 | |||
| Ti-15V- 3Cr-3Al- 3Sn | 2.5- 3.5 | 14.0-about 6.0 | 2.5- 3.5 | 2.5- 3.5 | The highest by 0.25 | The highest by 0.13 | |||
| Ti-10V- 2Fe-3Al | 2.6- 3.4 | 9.0- 11.0 | 1.6- 2.2 | The highest by 0.13 |
As is known to the person skilled in the art, about below 880 ℃ in temperature, titanium presents close heap hexagonal structure, is called " α " phase.In temperature is 880 ℃ or when above, titanium presents body-centered cubic structure, is called " β " phase.Have been found that, (stabilizing element of β-eutectoid) is preferably selected from a kind of element in chromium, iron and the manganese, and titanium alloy of the present invention can be allowed the oxygen of high level level by adding at least a β-eutectoid, thereby, can get by the ever-increasing recovery titanium preparation of quantity.The preferred yield strength of titanium alloy of the present invention is at least about 135,000psi, and tensile strength is at least about 155,000psi, and the percentage unit elongation is at least about 5%.
The basic titanium material that is used to form titanium alloy of the present invention is preferably the Ti-3Al-2.5V titanium alloy, Ti-6Al-4V titanium alloy or commercial pure titanium.As used herein, term " commercial pure titanium " refers to that titanium content accounts for the titanium material of material weight at least about 98wt.%.Ti-6Al-4V titanium alloy and commercial pure titanium quantity are many, various informative, comprise electrode, waste material and sheet material, and obtain easily to be used for recycling.
First kind of preferred embodiment of the present invention described now.According to this embodiment, this titanium alloy preferably includes and accounts for the about 3.5wt.% of titanium alloy weight to the interior aluminium of about 6.25wt.% scope, more preferably to the scope of about 6.0wt.%, preferred especially aluminium is at about 5.0wt.% extremely in about 6.0wt.% scope at about 4.5wt.% for aluminium.Aluminium is α-phase stabilizer, and it helps to increase alloy strength.As is known to the person skilled in the art, Rosenberg (Rosenberg) experimental formula has been described the relation between the titanium alloy element that can be used to prepare the alloy with good ductility, intensity and metallurgical stability.Especially, this formula is used to develop and has the normal high-temperature titanium alloy of maximum aluminium.The Rosenberg formula is described below:
Al+1/3Sn+1/6Zr+10 oxygen≤9
According to this embodiment, this titanium alloy does not preferably comprise tin or zirconium.Particularly preferably be, aluminium content is no more than 6.0wt.%, because under the situation that does not have tin and zirconium, when oxygen level accounts for titanium alloy weight and is up to about 0.3wt.%, this kind titanium alloy will satisfy the Rosenberg formula.
According to this embodiment, this titanium alloy preferably contains and accounts for the about 3.0wt.% of titanium alloy weight to the interior vanadium of about 4.5wt.% scope.Vanadium is β-similar shape stablizer (beta-isomorphous stabilizar), and it is used to improve the intensity of titanium alloy.The ratio of vanadium and aluminium can influence balancing each other of alloy, and preferably maintains mechanical property is optimized in permission by precipitation-hardening alpha-beta and metastable beta-titanium alloy level.
This titanium alloy also preferably contains at least a β-eutectoid stabilizing element that is selected from chromium, iron and manganese.The gross weight of chromium, iron and manganese preferably account for titanium alloy weight at about 1.0wt.% to the scope of about 5.0wt.%.More preferably at about 1.0wt.% to the scope of about 4.5wt.%, particularly preferably in about 2.0wt.% extremely in the scope of about 3.5wt.%.
Chromium preferably accounts in the scope that titanium alloy weight is up to about 3.8wt.%, the content of chromium more preferably at about 1.0wt.% to the scope of about 2.5wt.%, particularly preferably in about 1.2wt.% extremely in the scope of about 2.0wt.%.
According to this embodiment, iron is preferably in being up to the scope of about 1.0wt.%.Manganese preferably accounts in the scope that titanium alloy weight is up to about 2.0wt.%, the content of manganese more preferably in accounting for the scope that titanium alloy weight is up to about 1.5wt.%, particularly preferably in about 0.75wt.% to the scope of about 1.25wt.%.Have been found that the manganese that adds aforementioned contents level can improve alloy strength.
Chromium, iron and manganese are effective β-eutectoid stablizers.They are used to improve intensity and control ductility and titanium alloy to heat treated reaction.They are easy to melt, and can be added into element form, and therefore, their processing is more cheap.Although all three kinds of elements all are β-eutectoid stablizers, have been found that they are mixed the titanium material acquisition that is particularly preferred for by reclaiming has the excellent intensity or the titanium alloy of ductility.
As previously explained, have been found that to add aforementioned β-eutectoid stabilizing element that the oxygen levels that makes titanium alloy of the present invention allow improves, and still keeps excellent ductility simultaneously.According to this embodiment, oxygen exists in accounting for the scope that titanium alloy weight is up to about 0.3wt.%, and oxygen is preferably in accounting for the scope that titanium alloy weight is up to about 0.29wt.%, more preferably in accounting for the scope that titanium alloy weight is up to about 0.27wt.%.Titanium alloy of the present invention is allowed the ability of the oxygen of contents level like this, makes them to be got by quantity ever-increasing recovery titanium material preparation.In addition, the oxygen level of raising is improved the ductility of titanium alloy.
According to this embodiment, other element also can exist, and preferably, the nitrogen content level is no more than about 0.05wt.% of titanium alloy weight, more preferably the nitrogen content level is no more than about 0.04wt.% of titanium alloy weight, and special preferred nitrogen contents level is no more than about 0.035wt.% of titanium alloy weight.This titanium alloy preferably contains the carbon that contents level is no more than about 0.1wt.% of titanium alloy weight, and more preferably the nitrogen content level is no more than about 0.05wt.%, and special preferred nitrogen contents level is no more than about 0.03wt.%.
The hydrogen richness level preferably maintains the about 150ppm that is no more than titanium alloy weight, and the hydrogen richness level preferably is no more than about 125ppm.If there is any element except that aforementioned elements, then they each quantity is no more than 0.1wt.%, and their total amounts in titanium alloy are no more than 0.4.wt.%.For ease of reference, table 2 is described be used for the embodiment of the present invention composition preferably, more preferably, particularly preferred scope:
Table 2-element accounts for the percentage range of weight alloy
| Preferable range | More preferably scope | Special preferable range | |
| Aluminium | About 3.5-about 6.25 | About 4.5-about 6.0 | About 5.0-about 6.0 |
| Vanadium | About 3.0-about 4.5 | About 3.3-about 4.5 | About 3.5-about 4.5 |
| Chromium | Be up to about 3.8 | About 1.0-about 2.5 | About 1.2-about 2.0 |
| Manganese | Be up to about 2.0 | Be up to about 1.5 | About 0.75-about 1.25 |
| Iron | Be up to about 1.0 | Be up to about 1.0 | Be up to about 1.0 |
| Oxygen | Be up to about 0.3 | Be up to about 0.29 | The tallest and the biglyyest reach about 0.27 |
| Nitrogen | Be no more than about 0.05 | Be no more than about 0.04 | Be no more than about 0.035 |
| Hydrogen | Be no more than about 150ppm | Be no more than about 125ppm | Be no more than about 125ppm |
| Carbon | Be no more than about 0.1 | Be no more than about 0.05 | Be no more than about 0.03 |
| Other element, every kind | Be no more than about 0.1 | Be no more than about 0.1 | Be no more than about 0.1 |
| Other element, total amount | Be no more than about 0.4 | Be no more than about 0.4 | Be no more than about 0.4 |
| Cr+Mn+Fe | About 1.0-about 5.0 | About 1.0-about 4.5 | About 2.0-about 3.5 |
Under their as cast condition, will preferably have the yield strength of 000psi at least about 135 according to the titanium alloy of the present embodiment manufacturing.They also will preferably have at least about 155, the tensile strength of 000psi and at least about 5.0% percentage unit elongation.As used herein, term " as cast condition (as-cast) " refers to casting (casting) afterwards, but the alloy state before any thermal treatment, annealing, moulding or any other hot mechanical treatment.What can expect is to stand this processing process forging product afterwards and will have even higher yield strength, tensile strength and percentage unit elongation value.
The embodiment that the present invention prepares the method for titanium alloy is described now.According to this embodiment, provide existing commercial pure titanium material, preferably that reclaim or useless titanium material.In this embodiment, use the 1 grade commercial pure titanium of rank as UNS (unified numbering system) R50250.Except titanium, R50250 comprises the iron of 0.20wt.% and the oxygen of 0.18wt.%.Yet because retrieve, this oxygen level will be higher than unworn R50250 material.
According to this embodiment, the R50250 material is melted, and mixes with aluminium-vanadium master alloy.Preferably, the content of aluminium in the Al-V master alloy is to make that al composition accounts for the content of about 3.5wt.% of titanium alloy weight to about 6.25wt.% in titanium alloy.The content of vanadium in the Al-V master alloy is preferably, and makes that the about 3.0wt.% of vanadium ingredients constitute titanium alloy weight is to the content of about 4.5wt.% in titanium alloy.Add at least a β-eutectoid stablizer that is selected from chromium, iron and manganese, add-on makes their total contents in titanium alloy account for about 1.0wt.% of titanium alloy weight to the scope of about 5.0wt.%.The content of chromium in titanium alloy preferably accounts in the scope that titanium alloy weight is up to about 3.8wt.%, and the content of manganese in titanium alloy preferably accounts in the scope that titanium alloy weight is up to about 2.0wt.%.The content of iron in titanium alloy preferably accounts in the scope that titanium alloy weight is up to about 1.0wt.%.The content of oxygen in titanium alloy preferably accounts in the scope that titanium alloy weight is up to about 0.3wt.%.Oxygen levels is preferably controlled by useless titanium material or the titanium sponge selecting to have suitable low oxygen content.If present, carbon, hydrogen, nitrogen and other impurity preferably remain in the scope of describing in the table 1 " in the preferable range ".The contents level of these elements in the titanium alloy preferably recovery titanium of these elements by selecting to have suitable low levels level controlled.
More preferably, the quantity of aluminium, vanadium, chromium, manganese and the iron that adds reaches the weight percent of describing in table 2 " more preferably in the scope " row, and control oxygen, nitrogen, hydrogen, carbon and the contents level of other impurity in alloy, to reach the level of describing in " more preferably scope " row.Particularly preferably be, contain the aforementioned elements of the content that table 2 " special preferable range " lists according to the alloy of the present embodiment preparation.Titanium alloy according to the preparation of the method for the present embodiment will preferably have at least about 135, the yield strength of 000psi, and at least about 155, the tensile strength of 000psi and at least about 5.0% percentage unit elongation.
According to another embodiment of the present invention, provide method by existing Ti-6Al-4V material preparation titanium alloy.That the Ti-6Al-4V material preferably reclaims or alloyed scrap material.Commercial system Ti-6Al-4V contains the aluminium of 5.5wt.% to 6.75wt.%, and the vanadium of 3.5wt.% to 4.5wt.% is up to the iron of 0.3wt.%, is up to the oxygen of 0.2wt.%.Yet because the use of salvage material, oxygen level usually will be above 0.2wt.%.According to the present embodiment, aluminium content will preferably be no more than about 6.0wt.% of titanium alloy weight among the Ti-6Al-4V.
At least a β-eutectoid stablizer and the Ti-6Al-4V material mixing that is selected from chromium, manganese and iron, the total content of chromium, manganese and iron are in table 2 in the specifically described preferable range.More preferably use table 2 more preferably specifically described scope, the especially preferably scope of specifically stating in special preferable range one row of use table 2 in scope one row.Oxygen, carbon, hydrogen, nitrogen and other impurity also preferably remain in the table 2 in the specifically described scope.Titanium alloy according to the preparation of the method for this embodiment will preferably have at least about 135, the yield strength of 000psi, and at least about 155, the tensile strength of 000psi and at least about 5.0% percentage unit elongation.
According to another embodiment of the present invention, provide the method for preparing titanium alloy by existing Ti-3Al-2.5V alloy.This alloy preferably reclaims.According to this embodiment, the Ti-3Al-2.5V material mixing of aluminium and vanadium and recovery, so, resulting titanium alloy contain account for the about 3.5wt.% of titanium alloy weight to about 6.25wt.% scope aluminium and account for the extremely interior vanadium of about 4.5wt.% scope of the about 3.0wt.% of titanium alloy weight.Add at least a β-eutectoid stablizer that is selected from chromium, manganese and iron, like this, their total contents in titanium alloy at the about 1.0wt.% that accounts for titanium alloy weight to the scope of about 5.0wt.%.Preferably, the oxygen level of this titanium alloy accounts for titanium alloy weight and is up to about 0.3wt.%.In the table 2 remaining each element preferably, more preferably can be applicable to this method equally with particularly preferred value.
By the embodiment with reference to following titanium alloy according to the present invention preparation, the present invention may be better understood.All samples was heat-treated 2 hours by hot isostatic pressing under 1650 and 15,000 ± 500psi, then ageing treatment 4 to 12 hours in 900 to 1100 scopes.
Table 3-embodiment
| Element | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | Sample 7 | Sample 8 |
| Al | 5.81 | 5.76 | 5.5 | 5.8 | 5.89 | 5.7 | 5.44 | 5.62 |
| V | 3.77 | 3.73 | 3.69 | 3.8 | 3.71 | 3.7 | 3.64 | 3.83 |
| Cr | 1.37 | 2.22 | 1.8 | 1.16 | 1.15 | 1.93 | 1.28 | -- |
| Mn | -- | -- | 1.03 | -- | 1.15 | 1.58 | 0.98 | 1.84 |
| Fe | 0.19 | 0.15 | 0.17 | 0.12 | 0.17 | 0.014 | 0.96 | 0.17 |
| O | 0.27 | 0.26 | 0.27 | 0.24 | 0.27 | 0.29 | 0.28 | 0.29 |
| N | 0.022 | 0.02 | 0.023 | 0.018 | 0.024 | 0.03 | 0.038 | 0.03 |
| H | 0.0029 | 0.007 | 0.0075 | 0.0037 | 0.0049 | 0.0014 | 0.0034 | 0.0015 |
| C | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.01 | 0.02 | 0.01 |
| Ti | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
| State | As cast condition | As cast condition | As cast condition | As cast condition | As cast condition | As cast condition | As cast condition | As cast condition |
| YS，ksi * | 138 | 143 | 143 | 136 | 145 | 149 | ||
| UTS，ksi * | 161 | 164 | 164 | 159 | 166 | 169 | ||
| ％elong *. | 8.5 | 8.5 | 7.5 | 9.5 | 6.5 | 7 | ||
| ％RA * | 19 | 23 | 18 | 17 | 17 | 14 | ||
| State | Thermal treatment | Thermal treatment | Thermal treatment | Thermal treatment | Thermal treatment | Thermal treatment | Thermal treatment | Thermal treatment |
| YS，ksi * | 144 | 146 | 150 | 145 | 150 | 152 | 153 | 149 |
| UTS，ksi * | 160 | 1162 | 165 | 165 | 171 | 167 | 165 | 164 |
| ％elong *. | 9.5 | 11 | 10 | 9 | 7 | 9 | 8 | 7.5 |
| ％RA * | 23 | 22 | 22 | 15 | 14 | 17 | 21 | 16.5 |
*Annotate: YS=yield strength, ksi=1000 pound/(inch)
2, the UTS=ultimate tensile strength,
%elong.=percentage unit elongation, %RA=percentage relative reduction in area." thermal treatment " refers to the material after the thermal treatment to term.
Shown in data, all in various degree the restrictions that surpasses traditional 0.2wt.% of the oxygen levels of the alloy in the table 3, but still obtain yield strength greater than 135,000psi, tensile strength is greater than 155,000psi, and percentage unit elongation value is greater than 5% as cast condition titanium alloy.In addition, thermal treatment has further improved intensity and ductility.
Table 4 provides several alloys and several commercial comparison of using yield strength, tensile strength and the percentage unit elongation of alloy in the table 3:
The comparison of commercial titanium of table 4-and embodiment of the present invention
| Alloy and state | Yield strength ksi * | Ultimate tensile strength ksi * | Percentage unit elongation % |
| Ti-6Al-4V (casting and heat treated) | 120 | 134 | 8 |
| Ti-6Al-4V (annealed is rolled in forging) | 137 | 151 | 14 |
| Ti-6Al-2Sn-2Mo-2Zr-2Cr (casting and heat treated) | 131 | 155 | 5 |
| BT (β)-22 (casting and heat treated) | 151 | 151 | 1.5 |
| Sample 1 (casting and heat treated) | 144 | 160 | 9.5 |
| Sample 3 (casting and heat treated) | 150 | 165 | 10 |
| Sample 7 (casting and heat treated) | 153 | 165 | 8 |
| Sample 8 (casting and heat treated) | 149 | 164 | 7.5 |
*Annotate: ksi=1000 pound/(inch)
2
As shown in table 4, the sample of previous embodiments preparation has obtained yield strength and tensile strength that can be suitable with Ti-6Al-2Sn-2Mo-2Zr-2Cr with original Ti-6Al-4V according to the present invention, or more excellent yield strength and tensile strength, and allow obviously higher oxygen levels (referring to table 1 and 3) simultaneously.The result of the oxygen level tolerance that increases as their, compared with the titanium alloy that has than the low oxygen content tolerance, titanium alloy of the present invention can be prepared by the salvage material of greater amt.
Above-described embodiment is an exemplary of the present invention.Those skilled in the art can use above-mentioned embodiment now in large quantities, or revise above-mentioned embodiment, and do not deviate from invention thought disclosed herein.Therefore, the present invention is only limited by the scope of claim.
Claims (10)
1. titanium alloy comprises:
Aluminium, its at the about 3.5wt.% that accounts for described titanium alloy weight to the scope of about 6.25wt.%;
Vanadium, its at the about 3.0wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%;
One or more are selected from the element of chromium, iron and manganese, wherein said a kind of and multiple element at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 5.0wt.%;
Titanium exists with surplus;
Wherein under as cast condition, the yield strength of described alloy is at least about 135,000psi.
2, titanium alloy as claimed in claim 1, wherein, under as cast condition, the tensile strength of described titanium alloy is at least about 155,000psi.
3, titanium alloy as claimed in claim 1, wherein, under as cast condition, the percentage unit elongation of described titanium alloy is at least about 5%.
4, titanium alloy as claimed in claim 1, wherein, the content of chromium at the about 1.0wt.% that accounts for described titanium alloy weight to the scope of about 2.5wt.%.
5, titanium alloy as claimed in claim 1, wherein, the content of chromium at the about 1.2wt.% that accounts for described titanium alloy weight to the scope of about 2.0wt.%.
6, titanium alloy as claimed in claim 1, wherein, the content of manganese is in accounting for the scope that is up to about 2.0wt.% of described titanium alloy weight.
7, titanium alloy as claimed in claim 1, wherein, the content of manganese at the about 0.75wt.% that accounts for described titanium alloy weight to the scope of about 1.25wt.%.
8, titanium alloy as claimed in claim 1, wherein, the content of iron is in accounting for the scope that is up to about 1.0wt.% of described titanium alloy weight.
9, titanium alloy as claimed in claim 1, wherein, the content of aluminium at the about 5.0wt.% that accounts for described titanium alloy weight to the scope of about 6.0wt.%.
10, titanium alloy as claimed in claim 1, wherein, the content of vanadium at the about 3.3wt.% that accounts for described titanium alloy weight to the scope of about 4.5wt.%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/933,638 US20060045789A1 (en) | 2004-09-02 | 2004-09-02 | High strength low cost titanium and method for making same |
| US10/933,638 | 2004-09-02 |
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| US (1) | US20060045789A1 (en) |
| EP (1) | EP1632581A1 (en) |
| JP (1) | JP2006070362A (en) |
| CN (1) | CN1743482A (en) |
| TW (1) | TW200641148A (en) |
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Also Published As
| Publication number | Publication date |
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| JP2006070362A (en) | 2006-03-16 |
| EP1632581A1 (en) | 2006-03-08 |
| TW200641148A (en) | 2006-12-01 |
| US20060045789A1 (en) | 2006-03-02 |
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