CN105018741A - Method for preparing homogenized Ti2AlNb alloy cast ingot - Google Patents
Method for preparing homogenized Ti2AlNb alloy cast ingot Download PDFInfo
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Abstract
The invention provides a method for preparing a homogenized Ti2AlNb alloy cast ingot. A titanium-niobium alloy cast ingot is machined into a scrap material, and then the titanium-niobium alloy scrap material and aluminum shots are evenly mixed and pressed into an electrode block; and then, the electrode block is installed and welded into a consumable electrode, and the Ti2AlNb alloy cast ingot is obtained through vacuum consumable electric arc melting, wherein the weight of the aluminum shots is 1.05 times of the content of the aluminum element in Ti2AlNb alloy. The titanium-niobium alloy scrap material is adopted to serve as intermediate alloy, chemical components of the titanium-niobium alloy scrap material are uniform, and the melting point is relative low so that niobium segregation in the melting process can be effectively alleviated, and it is guaranteed that quality stability of the finally made cast ingot is high. The Ti2AlNb alloy cast ingot made through the method does not have the niobium element segregation phenomenon; the head part, the middle part and the tail part of the cast ingot are sampled for chemical component analysis after the alloy cast ingot is subjected to scalping and riser cutting, it is presented that alloy component accuracy is high, uniformity is good, the yield of raw materials is increased, and material consumption is reduced.
Description
Technical field
The invention belongs to titanium alloy preparation field, relate to a kind of preparation method of titanium aluminium niobium ternary alloy, be specifically related to a kind of preparation method of homogeneous Ti2AlNb alloy cast ingot.
Background technology
Ti2AlNb alloy is a kind of Ti-Al series intermetallic compound, the usual composition range of Ti2AlNb alloy is Ti-(18-30) Al-(12.5-30) Nb (at%), it, based on the O of orthogonal ordered structure (Orthorhombic) phase, is therefore also called O phase alloy.Because the intrinsic plasticity of O phase is higher, Ti2AlNb alloy shows the advantages such as excellent fracture toughness property, high temperature specific tenacity and specific rigidity, high temperature and creep resistance, antioxidant property and low thermal coefficient of expansion, these excellent properties make Ti2AlNb alloy can use as high-temperature structural material, during Ti2AlNb base alloy long, working temperature can reach 650 ~ 750 DEG C, short-term operation temperature can reach 1100 DEG C, is expected to obtain widespread use in fields such as aerospace.
The difference such as fusing point, density and vapour pressure between each element of Ti2AlNb alloy is larger, difficulty is brought to the preparation of alloy, the Ti2AlNb alloy niobium element segregation that Conventional processing methods is prepared is serious, and aluminium element volatilization is comparatively large, and alloying constituent accuracy and homogeneity are difficult to be guaranteed.For reducing alloy melting temp and improving alloying effect, therefore, need a kind of better preparation method to improve the metallurgical quality of titanium-niobium alloy ingot casting.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, the homogeneous Ti2AlNb alloy preparation method providing a kind of quality stability high, the alloying constituent accuracy of obtained ingot casting is high, good uniformity.
For achieving the above object, the technical solution used in the present invention is:
A kind of preparation method of homogeneous Ti2AlNb alloy cast ingot, titanium-niobium alloy ingot casting is processed into bits material, then is pressed into electrode block after being mixed with aluminium shot by niobium titanium alloy bits material, then electrode block assembly welding is become consumable electrode, through vacuum consumable arc-melting, obtain homogeneous Ti2AlNb alloy cast ingot; Wherein, aluminium shot weight is 1.05 times of Ti2AlNb Aluminum in Alloy constituent content.
Concrete steps are as follows:
Step 1: according to the content of titanium, niobium in Ti2AlNb alloy composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through repeatedly vacuum consumable arc-melting, and obtained titanium-niobium alloy ingot casting;
Step 2: the titanium-niobium alloy ingot casting that step 1 is obtained is processed into bits material;
Step 3: the batching value calculating required titanium-niobium alloy bits material and aluminium shot according to ingot casting target chemical composition, and titanium-niobium alloy bits material is mixed with aluminium shot, then be pressed into some electrode blocks, wherein, aluminium shot weight is 1.05 times of Ti2AlNb Aluminum in Alloy constituent content;
Step 4: some electrode block assembly weldings are become consumable electrode;
Step 5: consumable electrode melting step 4 prepared, obtains Ti2AlNb alloy cast ingot.
In described step 2, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm.
In described step 2 bits material also through magnet process to remove impurity, then clean, dry.
Described cleaning adopts alcohol washes.
Plasma arc welding method is adopted to carry out assembly welding in described step 4.
2 ~ 3 vacuum consumable arc-melting methods are adopted to carry out melting in described step 5.
The electric current of melting in described step 5 is 5-10KA, and the voltage of melting is 24-35V.
Compared with prior art, the beneficial effect that has of the present invention:
1) adopt titanium-niobium alloy bits material as master alloy, because titanium-niobium alloy bits material chemical composition is even, fusing point is relatively low, so effectively can alleviate the niobium segregation in fusion process, ensures that final obtained ingot quality stability is high.
2) due to 1.05 times that the add-on of aluminium shot is Ti2AlNb alloy aluminum constituent content, certain scaling loss amount is reserved with, so can ensure that the ingot casting aluminium element content melted out meets the demands.
3) the obtained Ti2AlNb alloy cast ingot of the inventive method is adopted to there is not niobium element segregation phenomenon, alloy cast ingot is after stripping off the skin, cutting rising head, ingot casting head, in, afterbody sampling carry out chemical composition analysis, show that alloying constituent accuracy is high, good uniformity, improve starting material lumber recovery, reduce spillage of material.
Further, because titanium-niobium alloy bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm, bits material is small size sheet, and aluminium shot is that small size is granular, and the two can fully mix, and is conducive to ingot casting homogeneity of ingredients and controls.
Embodiment
Be described in further detail the present invention below in conjunction with embodiment, in the present invention, at% represents atomicity percentage composition, and wt% represents weight percentage.
Embodiment 1
To prepare 100kg Ti-22at%Al-25at%Nb alloy cast ingot, its preparation method, comprises the following steps:
Step 1: prepare the uniform Ti-42.59wt%Nb alloy cast ingot of chemical composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through three vacuum consumable arc-meltings, obtains titanium-niobium alloy ingot casting.
Step 2: titanium-niobium alloy ingot casting step 1 prepared is processed into bits material, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm; Bits material removes impurity through magnet process, and dries with alcohol washes.
Step 3: preparation 100kg Ti-22at%Al-25at%Nb alloy cast ingot needs titanium-niobium alloy to consider material 89.12kg, aluminium shot 11.42kg to be worth doing, is divided into 5 parts after being mixed by titanium-niobium alloy bits material, is then pressed into 5 cube electrode blocks with aluminium shot.
Step 4: adopt plasma arc welding method, electrode block assembly welding step 3 prepared becomes a consumable electrode.
Step 5: adopt three vacuum consumable arc-melting methods, consumable electrode melting step 4 prepared obtains homogeneous Ti-22at%Al-25at%Nb alloy cast ingot; Melting electric current is 5-7KA, and melting voltage is 24-30V.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, afterbody sampling carries out chemical composition analysis.Principal element aluminium, niobium detected result are in table 1:
Table 1 Ti-22at%Al-25at%Nb alloy cast ingot aluminium, content of niobium (wt%)
| Position | Head | In | Tail |
| Aluminium content | 11.12 | 10.95 | 10.82 |
| Content of niobium | 42.54 | 42.95 | 42.63 |
As can be seen from Table 1, aluminium, content of niobium all meet the component requirements in Ti2AlNb alloy cast ingot.
Embodiment 2
To prepare 100kg Ti-21at%Al-22at%Nb alloy cast ingot, its preparation method, comprises the following steps:
Step 1: prepare the uniform Ti-42.82wt%Nb alloy cast ingot of chemical composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through three vacuum consumable arc-meltings, obtains titanium-niobium alloy ingot casting.
Step 2: titanium-niobium alloy ingot casting step 1 prepared is processed into bits material, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm; Bits material removes impurity through magnet process, and dries with alcohol washes.
Step 3: preparation 100kg Ti-21at%Al-22at%Nb alloy cast ingot needs titanium-niobium alloy to consider material 89.39kg, aluminium shot 11.42kg to be worth doing, is divided into 5 parts after being mixed by the titanium-niobium alloy got bits material, is then pressed into 5 cube electrode blocks with aluminium shot.
Step 4: adopt plasma arc welding method, electrode block assembly welding step 3 prepared becomes a consumable electrode.
Step 5: adopt three vacuum consumable arc-melting methods, consumable electrode melting step 4 prepared obtains homogeneous Ti-21at%Al-22at%Nb alloy cast ingot; Melting electric current is 7-10KA, and melting voltage is 30-35V.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, tail bit sampling carries out chemical composition analysis.Principal element aluminium, niobium detected result are in table 2:
Table 2 Ti-21at%Al-22at%Nb alloy cast ingot aluminium, content of niobium (wt%)
| Position | Head | In | Tail |
| Aluminium content | 10.75 | 10.92 | 10.66 |
| Content of niobium | 38.10 | 38.54 | 38.36 |
As can be seen from Table 2, aluminium, content of niobium all meet the component requirements in Ti2AlNb alloy cast ingot.
Embodiment 3
To prepare 100kg Ti-23at%Al-17at%Nb alloy cast ingot, its preparation method, comprises the following steps:
Step 1: prepare the uniform Ti-35.48wt%Nb alloy cast ingot of chemical composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through three vacuum consumable arc-meltings, obtains titanium-niobium alloy ingot casting.
Step 2: titanium-niobium alloy ingot casting step 1 prepared is processed into bits material, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm; Bits material through magnet process, and is dried with alcohol washes.
Step 3: preparation 100kg Ti-23at%Al-17at%Nb alloy cast ingot needs titanium-niobium alloy to consider material 87.77kg, aluminium shot 12.84kg to be worth doing, is divided into 5 parts after being mixed by the titanium-niobium alloy got bits material, is then pressed into 5 cube electrode blocks with aluminium shot.
Step 4: adopt plasma arc welding method, electrode block assembly welding step 3 prepared becomes a consumable electrode.
Step 5: adopt three vacuum consumable arc-melting methods, consumable electrode melting step 4 prepared obtains Ti-23at%Al-17at%Nb alloy cast ingot; Melting electric current is 6-9KA, and melting voltage is 28-31V.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, tail bit sampling carries out chemical composition analysis.Principal element aluminium, niobium detected result are in table 3:
Table 3 Ti-23at%Al-17at%Nb alloy cast ingot aluminium, content of niobium (wt%)
| Position | Head | In | Tail |
| Aluminium content | 12.52 | 12.31 | 12.65 |
| Content of niobium | 31.05 | 31.32 | 31.40 |
As can be seen from Table 3, aluminium, content of niobium all meet the component requirements in Ti2AlNb alloy cast ingot.
Embodiment 4
To prepare 100kg Ti-22at%Al-23at%Nb alloy cast ingot, its preparation method, comprises the following steps:
Step 1: prepare the uniform Ti-44.80wt%Nb alloy cast ingot of chemical composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through three vacuum consumable arc-meltings, obtains titanium-niobium alloy ingot casting.
Step 2: titanium-niobium alloy ingot casting step 1 prepared is processed into bits material, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm; Bits material through magnet process, and is dried with alcohol washes.
Step 3: preparation 100kg Ti-22at%Al-23at%Nb alloy cast ingot needs titanium-niobium alloy to consider material 88.93kg, aluminium shot 11.63kg to be worth doing, is divided into 5 parts after being mixed by the titanium-niobium alloy got bits material, is then pressed into 5 cube electrode blocks with aluminium shot.
Step 4: adopt plasma arc welding method, electrode block assembly welding step 3 prepared becomes a consumable electrode.
Step 5: adopt secondary vacuum consumable arc-melting method, consumable electrode melting step 4 prepared obtains Ti-22at%Al-23at%Nb alloy cast ingot; Melting electric current is 8-10KA, and melting voltage is 33-35V.
After the ingot casting of preparation is stripped off the skin, cuts rising head, ingot casting head, in, tail bit sampling carries out chemical composition analysis.Principal element aluminium, niobium detected result are in table 4:
Table 4 Ti-22at%Al-23at%Nb alloy cast ingot aluminium, content of niobium (wt%)
| Position | Head | In | Tail |
| Aluminium content | 11.15 | 11.52 | 11.04 |
| Content of niobium | 39.80 | 39.65 | 39.75 |
As can be seen from Table 4, aluminium, content of niobium all meet the component requirements in Ti2AlNb alloy cast ingot.
The present invention improves the obtained phenomenon such as Ti2AlNb alloy cast ingot uneven components, niobium segregation of existing technique, and obtained alloy cast ingot alloying constituent accuracy is high, good uniformity.
Claims (8)
1. the preparation method of a homogeneous Ti2AlNb alloy cast ingot, it is characterized in that, titanium-niobium alloy ingot casting is processed into bits material, electrode block is pressed into after being mixed with aluminium shot by niobium titanium alloy bits material again, then electrode block assembly welding is become consumable electrode, through vacuum consumable arc-melting, obtain homogeneous Ti2AlNb alloy cast ingot; Wherein, aluminium shot weight is 1.05 times of Ti2AlNb Aluminum in Alloy constituent content.
2. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 1, it is characterized in that, concrete steps are as follows:
Step 1: according to the content of titanium, niobium in Ti2AlNb alloy composition, adopts titanium rod to prepare consumable electrode with the mode of niobium rod welding, through repeatedly vacuum consumable arc-melting, and obtained titanium-niobium alloy ingot casting;
Step 2: the titanium-niobium alloy ingot casting that step 1 is obtained is processed into bits material;
Step 3: the batching value calculating required titanium-niobium alloy bits material and aluminium shot according to ingot casting target chemical composition, and titanium-niobium alloy bits material is mixed with aluminium shot, then be pressed into some electrode blocks, wherein, aluminium shot weight is 1.05 times of Ti2AlNb Aluminum in Alloy constituent content;
Step 4: some electrode block assembly weldings are become consumable electrode;
Step 5: consumable electrode melting step 4 prepared, obtains homogeneous Ti2AlNb alloy cast ingot.
3. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 2, is characterized in that, in described step 2, bits material is of a size of: length≤30mm, width≤8mm, thickness≤1mm.
4. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 2, is characterized in that, in described step 2 bits material also through magnet process to remove impurity, then clean, dry.
5. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 4, is characterized in that, described cleaning adopts alcohol washes.
6. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 2, is characterized in that, adopts plasma arc welding method to carry out assembly welding in described step 4.
7. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 2, is characterized in that, adopts 2 ~ 3 vacuum consumable arc-melting methods to carry out melting in described step 5.
8. the preparation method of homogeneous Ti2AlNb alloy cast ingot according to claim 2, is characterized in that, the electric current of melting in described step 5 is 5-10KA, and the voltage of melting is 24-35V.
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Application publication date: 20151104 |