CN111519066A - Preparation method for improving component uniformity of large-size titanium alloy ingot - Google Patents
Preparation method for improving component uniformity of large-size titanium alloy ingot Download PDFInfo
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- CN111519066A CN111519066A CN202010455710.9A CN202010455710A CN111519066A CN 111519066 A CN111519066 A CN 111519066A CN 202010455710 A CN202010455710 A CN 202010455710A CN 111519066 A CN111519066 A CN 111519066A
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Abstract
The invention discloses a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which adopts a computer numerical simulation method to establish a numerical model of the titanium alloy ingot; simulating a smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of a molten pool stable, namely obtaining the SDM smelting process; preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use; placing the consumable electrode in a vacuum consumable arc furnace for three times of smelting to obtain a rough ingot; and performing surface machining on the rough ingot to obtain a titanium alloy ingot. Solves the problems of component segregation and low batch stability of the titanium alloy ingot in the prior art.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a preparation method for improving component uniformity of a large-size titanium alloy ingot.
Background
With the integration and large-scale development of aviation titanium alloy structural parts, the requirements of large scale and large single weight are also put forward on the weight of a forging, the single weight of a bar or a forging stock required by the preparation of the forging is further increased, and higher requirements are put forward on the specification and the weight of a titanium alloy ingot. The larger the ingot size and weight, the longer the melting time it takes. The traditional titanium alloy smelting process comprises the following steps: the constant melting speed (current) melting is adopted for a long time, the process not only can increase the depth of a molten pool, cause the element segregation and the burning loss to be aggravated, but also can easily reduce the component uniformity. The difference of the uniformity of the components of the cast ingot can cause the difference of phase change points, so that the process window of subsequent processing is reduced, and the stability of the quality of finished products is not facilitated. For example, the damage tolerance type titanium alloy TC4-DT is generally subjected to beta heat treatment, the heat treatment temperature is above the beta transformation point, and if the components of the cast ingot are not uniform, the transformation point of the forging is fluctuated, so that the structure of a large forging subjected to beta heat treatment is different, the problem of out-of-tolerance or unqualified structure is caused, and the subsequent use is influenced.
In addition, for the titanium alloy grade easy to segregate, the increase of the ingot casting specification can greatly influence the component segregation. The large-size easy-segregation titanium alloy is prepared by adopting the traditional smelting process, and the component uniformity is more difficult to control. In order to meet the requirement of large-scale forging pieces for aviation, it is very meaningful to explore a smelting process of a titanium alloy ingot with larger size and higher component uniformity.
Disclosure of Invention
The invention aims to provide a preparation method for improving the component uniformity of a large-size titanium alloy ingot, and solves the problems of component segregation and low batch stability of the titanium alloy ingot in the prior art.
The invention adopts a technical scheme that a preparation method for improving the component uniformity of a large-size titanium alloy ingot is implemented according to the following steps:
step 2, simulating a smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of a molten pool stable, so as to obtain an SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
and 5, performing surface machining on the rough ingot to obtain a titanium alloy ingot.
The technical scheme of the invention is also characterized in that:
and 3, controlling the pressing pressure of the vacuum plasma welding to be 20-80 MPa.
In the step 4, the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace below 5.0Pa, the smelting current of 10-40 kA, the smelting voltage of 26-40V, the arc stabilizing current of 5-30A, the arc stabilizing period of 5s to direct current, and the cooling time after smelting to be not less than 5 h.
In the step 4, the SDM smelting process is adopted for the third smelting, and the method specifically comprises the following steps:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 3.0Pa, the smelting current to be 15-35 kA and the smelting voltage to be 23-40V, firstly reducing the smelting speed to be 14-20 kg/min when the consumable electrode is smelted at 900-1500 kg, secondly reducing the smelting speed to be 12-17 kg/min when the consumable electrode is smelted at 1500-2000 kg, and starting entering a feeding stage when the consumable electrode is 200-500 kg in residual weight, wherein the current reduction speed is gradually reduced, and the cooling time after smelting is not less than 9 hours.
The melting speed of the third melting is reduced according to the slope of 17kg/min → 14kg/min → 12 kg/min.
The melting speed of the third melting is reduced according to the slope of 20kg/min → 17kg/min → 14 kg/min.
The total weight of the ingredients is 4000-8000 kg.
The titanium alloy ingot comprises any one of TC4-DT, TC17 and TC18 titanium alloy ingots.
The invention has the beneficial effects that:
according to the preparation method for improving the component uniformity of the large-size titanium alloy ingot, the prepared titanium alloy ingot has good uniformity and stability and high ingot yield; the invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which utilizes a computer to simulate optimized process parameters, adopts a vacuum consumable electrode arc melting (VAR) method to melt a consumable electrode, strictly controls the current (melting speed) to be reduced in a step mode in the melting process, ensures the depth stability of a molten pool in the melting process, and improves the component uniformity of the ingot as shown in figure 1; according to the preparation method for improving the component uniformity of the large-size titanium alloy ingot, the large melting speed is adopted in the early stage to improve the production efficiency, the mode of reducing the melting speed step by step is adopted in the subsequent stage to ensure the stability of the depth of a molten pool, the uniformity of the ingot components is improved, and the problems of poor component uniformity and low ingot yield of the existing titanium alloy ingot with the diameter of over 720mm are solved; the preparation method can be popularized to ingot casting smelting of easy segregation alloys such as TB6 and TC21 titanium alloys, and has good application prospects.
Drawings
FIG. 1 is a schematic diagram showing the comparison between the depth of a molten pool required by a smelting process and the depth of a molten pool required by a traditional smelting process in the preparation method for improving the component uniformity of a large-size titanium alloy ingot according to the invention;
FIG. 2 is a schematic view of a sampling site of a large-size titanium alloy ingot produced by the present invention;
FIG. 2(a) is a schematic view of five-point sampling of the longitudinal surface of a large-size titanium alloy ingot prepared by the present invention
FIG. 2(b) is a schematic view of nine-point sampling of the transverse cross section of the head of a large-size titanium alloy ingot produced by the present invention
FIG. 3 is a line graph showing the analysis of the main element content of a large-size titanium alloy ingot produced in example 1;
FIG. 4 is a histogram of the principal element content analysis of a large-gauge titanium alloy ingot prepared in example 1;
FIG. 5 is a line graph showing the analysis of the main element content of a large-gauge titanium alloy ingot produced in example 2;
FIG. 6 is a histogram of the principal element content analysis of a large-gauge titanium alloy ingot prepared in example 2;
FIG. 7 is a line graph showing the analysis of the main element content of a large-gauge titanium alloy ingot produced in example 3;
FIG. 8 is a histogram of the principal element content analysis of a large-gauge titanium alloy ingot prepared in example 3;
FIG. 9 is a line graph showing the analysis of the main element content of a large-gauge titanium alloy ingot produced in example 4;
FIG. 10 is a histogram of the principal element content analysis of a large-gauge titanium alloy ingot prepared in example 4;
FIG. 11 is a line graph showing the analysis of the main element content of a large-gauge titanium alloy ingot produced in example 5;
FIG. 12 is a histogram of the principal element content analysis of a large-gauge titanium alloy ingot prepared in example 5.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating a smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed of 12-17 kg/min for keeping the depth of the molten pool stable, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 4000-8000 kg; the pressing pressure of vacuum plasma welding is controlled to be 20-80 MPa, so that the density of the consumable electrode is ensured;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 10-40 kA, the smelting voltage to be 26-40V, the arc stabilizing current to be 5-30A, the arc stabilizing period to be 5s until the direct current flows, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 3.0Pa, the smelting current to be 15-35 kA and the smelting voltage to be 23-40V, firstly reducing the melting speed to be 14-20 kg/min when the consumable electrode is smelted at 900-1500 kg, secondly reducing the melting speed to be 12-17 kg/min when the consumable electrode is smelted at 1500-2000 kg, and starting entering a feeding stage when the consumable electrode has the residual weight of 200-500 kg, wherein the current reduction speed is gradually reduced, and the cooling time after smelting is not less than 9 hours;
preferably, the melting speed of the third melting is reduced according to the slope of 20kg/min → 17kg/min → 14 kg/min.
Preferably, the melting speed of the third melting is reduced according to the slope of 17kg/min → 14kg/min → 12 kg/min.
Example 1
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating the smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of the molten pool stable to be 14kg/min, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 4000 kg; controlling the pressing pressure of vacuum plasma welding to be 20-25 MPa;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 10-20 kA, the smelting voltage to be 28-40V, the arc stabilizing current to be 5-15A, the arc stabilizing period to be 5s until the direct current is reached, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of a vacuum consumable electrode arc furnace to be below 3.0Pa by adopting a crucible with the diameter of 720mm, controlling the smelting current to be 15-30 kA and the smelting voltage to be 23-36V, starting to reduce the smelting speed to 16kg/min for the first time when the consumable electrode is smelted at 1000kg, starting to reduce the smelting speed to 14kg/min for the second time when the consumable electrode is smelted at 1600kg, starting to enter a feeding stage when the residual weight of the consumable electrode is 300kg, reducing the current reduction speed step by step, and cooling time after smelting to be not less than 9 h;
and 5, performing surface machining on the rough ingot to obtain a TC4-DT titanium alloy ingot.
The phi 720mmTC4-DT titanium alloy ingot smelted in the example 1 was sampled, specifically, nine-point sampling was performed on the transverse cross section of the head portion (FIG. 2(b)), five-point sampling was performed on the surface longitudinal direction (FIG. 2(a)), and as shown in FIG. 2, the uniformity of the entire composition of the TC4-DT titanium alloy ingot was analyzed, and as shown in FIGS. 3 and 4, the analysis data are shown in Table 1.
Table 1, TC4-DT titanium alloy ingot prepared in example 1 contained the main element component (% by mass)
As can be seen from FIG. 3, FIG. 4 and Table 1, the TC4-DT titanium alloy ingot prepared in the present example has good uniformity of longitudinal components, and the main elements all meet the standard requirements of GB/T3620.1; the TC4-DT titanium alloy ingot casting head has good transverse 9-point component uniformity, and the deviation of main elements is within 2300 ppm.
Example 2
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating the smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of the molten pool stable to be 13kg/min, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 8000 kg; controlling the pressing pressure of vacuum plasma welding to be 72-78 MPa;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 15-35 kA, the smelting voltage to be 26-32V, the arc stabilizing current to be 15-30A, the arc stabilizing period to be 5s until the direct current is reached, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
the method comprises the following steps of (1) controlling the vacuum degree of a vacuum consumable electrode arc furnace to be below 2.0Pa by using a crucible with the diameter of 920mm, controlling the smelting current to be 15-35 kA and the smelting voltage to be 25-40V, starting to reduce the smelting speed to 20kg/min for the first time when a consumable electrode is smelted at 1100kg, starting to reduce the smelting speed to 13kg/min for the second time when the consumable electrode is smelted at 1700kg, starting to enter a feeding stage when the consumable electrode has the residual weight of 400kg, reducing the current reduction speed step by step, and cooling the smelted consumable electrode for not less than 9 hours;
and 5, performing surface machining on the rough ingot to obtain a TC4-DT titanium alloy ingot.
Sampling was performed on the phi 920mmTC4-DT titanium alloy ingot smelted in example 2, specifically, nine-point sampling was performed on the transverse section of the ingot and five-point sampling was performed on the surface of the ingot, as shown in FIG. 2, the uniformity of the overall composition of the TC4-DT titanium alloy ingot was analyzed, as shown in FIGS. 5 and 6, and the analysis data is shown in Table 2.
Table 2, TC4-DT titanium alloy ingots prepared in example 2 contained the main element component (% by mass)
As can be seen from FIG. 5, FIG. 6 and Table 2, the TC4-DT titanium alloy ingot prepared in the present example has good uniformity of longitudinal components, and the main elements all meet the standard requirements of GB/T3620.1; the transverse 9-point component uniformity of the TC4-DT titanium alloy ingot casting head part is good, and the deviation of the main element is within 2000 ppm.
Example 3
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating the smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed of 17kg/min for keeping the depth of the molten pool stable, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 7000 kg; controlling the pressing pressure of vacuum plasma welding to be 70-80 MPa;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 20-40 kA, the smelting voltage to be 30-40V, the arc stabilizing current to be 20-30A, the arc stabilizing period to be 5s until the direct current flows, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of a vacuum consumable electrode arc furnace to be below 3.0Pa by adopting a crucible with the diameter of 920mm, controlling the smelting current to be 15-30 kA and the smelting voltage to be 23-35V, starting to reduce the smelting speed to 20kg/min for the first time when a consumable electrode is smelted at 1200kg, starting to reduce the smelting speed to 17kg/min for the second time when the consumable electrode is smelted at 1800kg, starting to enter a feeding stage when the consumable electrode has the residual weight of 500kg, reducing the current reduction speed step by step, and cooling time after smelting to be not less than 9 h;
and 5, performing surface machining on the rough ingot to obtain a TC18 titanium alloy ingot.
Sampling was performed on the titanium alloy ingot of Φ 920mmTC18 smelted in example 3, specifically, nine-point sampling was performed on the transverse cross section of the head portion thereof, and five-point sampling was performed on the surface thereof in the longitudinal direction, as shown in fig. 2, the uniformity of the entire composition of the TC18 titanium alloy ingot was analyzed, as shown in fig. 7 and 8, and the analysis data is shown in table 3.
Table 3, TC18 titanium alloy ingots prepared in example 3 contained the essential elements in percentage by mass
As can be seen from FIG. 7, FIG. 8 and Table 3, the TC18 titanium alloy ingot prepared in the present example has good uniformity of longitudinal composition, and the main elements all meet the standard requirements of GB/T3620.1; the TC18 titanium alloy ingot casting head has good transverse 9-point component uniformity, and the deviation of main elements is within 2000 ppm.
Example 4
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating the smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed of 15kg/min for keeping the depth of the molten pool stable, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 5000 kg; controlling the pressing pressure of vacuum plasma welding to be 60-65 MPa;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 15-30 kA, the smelting voltage to be 28-34V, the arc stabilizing current to be 10-20A, the arc stabilizing period to be 5s until the direct current is reached, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of a vacuum consumable electrode arc furnace to be below 3.0Pa by adopting a crucible with the diameter of 720mm, controlling the smelting current to be 15-30 kA and the smelting voltage to be 23-35V, starting to reduce the smelting speed to 16kg/min for the first time when the consumable electrode is smelted at 1500kg, starting to reduce the smelting speed to 15kg/min for the second time when the consumable electrode is smelted at 2000kg, starting to enter a feeding stage when the residual weight of the consumable electrode is 300kg, reducing the current reduction speed step by step, and cooling time after smelting to be not less than 6 h;
and 5, performing surface machining on the rough ingot to obtain a TC18 titanium alloy ingot.
The titanium alloy ingot of Φ 720mmTC18 smelted in example 4 was sampled, specifically, nine-point sampling was performed on the transverse cross section of the head portion thereof, five-point sampling was performed on the surface thereof in the longitudinal direction, as shown in fig. 2, the uniformity of the entire composition of the TC18 titanium alloy ingot was analyzed, as shown in fig. 9 and 10, and the analysis data was as shown in table 4.
TABLE 4, TC18 Ti alloy ingots prepared in example 4 contained the main element in percentage by mass
As can be seen from FIG. 9, FIG. 10 and Table 4, the TC18 titanium alloy ingot prepared in the present example has good uniformity of longitudinal composition, and the main elements all meet the standard requirements of GB/T3620.1; the TC18 titanium alloy ingot casting head has good transverse 9-point component uniformity, and the deviation of main elements is within 2000 ppm.
Example 5
The invention relates to a preparation method for improving the component uniformity of a large-size titanium alloy ingot, which is implemented according to the following steps:
step 2, simulating a smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of the molten pool stable to be 12kg/min, so as to obtain the SDM smelting process;
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain a consumable electrode for later use;
wherein the total weight of the ingredients is 6000 kg; controlling the pressing pressure of vacuum plasma welding to be 30-35 MPa;
the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 5.0Pa, the smelting current to be 10-25 kA, the smelting voltage to be 26-34V, the arc stabilizing current to be 5-15A, the arc stabilizing period to be 5s until the direct current flows, and cooling time after smelting to be not less than 5 h;
the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of a vacuum consumable electrode arc furnace to be below 3.0Pa by adopting a crucible with the diameter of 720mm, controlling the smelting current to be 15-30 kA and the smelting voltage to be 23-35V, starting to reduce the smelting speed to 14kg/min for the first time when the consumable electrode is smelted at 900kg, starting to reduce the smelting speed to 12kg/min for the second time when the consumable electrode is smelted at 1500kg, starting to enter a feeding stage when the consumable electrode has the residual weight of 200kg, reducing the current reduction speed step by step, and cooling time after smelting to be not less than 6 h;
and 5, performing surface machining on the rough ingot to obtain a TC17 titanium alloy ingot.
The titanium alloy ingot of Φ 720mmTC17 smelted in example 5 was sampled, specifically, nine-point sampling was performed on the transverse cross section of the head portion thereof, five-point sampling was performed on the surface thereof in the longitudinal direction, as shown in fig. 2, the uniformity of the entire composition of the TC17 titanium alloy ingot was analyzed, as shown in fig. 11 and 12, and the analysis data was shown in table 5.
Table 5, TC17 titanium alloy ingots prepared in example 5 contained the essential elements in percentage by mass
As can be seen from FIG. 11, FIG. 12 and Table 5, the TC17 titanium alloy ingot prepared in the present example has good uniformity of longitudinal composition, and the main elements all meet the standard requirements of GB/T3620.1; the TC17 titanium alloy ingot casting head has good transverse 9-point component uniformity, and the deviation of main elements is within 2000 ppm.
Claims (8)
1. A preparation method for improving the component uniformity of a large-size titanium alloy ingot is characterized by comprising the following steps:
step 1, establishing a numerical model of a titanium alloy ingot by adopting a computer numerical simulation method;
step 2, simulating a smelting process, and enabling the smelting speed to stably rise to the minimum smelting speed for keeping the depth of a molten pool stable, so as to obtain an SDM smelting process;
step 3, preparing an electrode
Preparing, mixing and pressing components required by a titanium alloy ingot into a plurality of electrode blocks, and welding a plurality of electrodes by adopting vacuum plasma to obtain consumable electrodes for later use;
step 4, placing the consumable electrode in a vacuum consumable arc furnace for three times of smelting to obtain a rough ingot;
and 5, performing surface machining on the rough ingot to obtain the titanium alloy ingot.
2. The preparation method for improving the component uniformity of the large-size titanium alloy ingot as claimed in claim 1, wherein in the step 3, the pressing pressure of the vacuum plasma welding is controlled to be 20-80 MPa.
3. The preparation method for improving the uniformity of the components of the large-size titanium alloy ingot according to claim 1, wherein in the step 4, the first smelting and the second smelting are specifically as follows:
controlling the vacuum degree of the vacuum consumable electrode arc furnace below 5.0Pa, the smelting current of 10-40 kA, the smelting voltage of 26-40V, the arc stabilizing current of 5-30A, the arc stabilizing period of 5s to direct current, and the cooling time after smelting to be not less than 5 h.
4. The preparation method for improving the uniformity of the components of the large-size titanium alloy ingot according to claim 1, wherein in the step 4, the third smelting adopts an SDM smelting process, which specifically comprises the following steps:
controlling the vacuum degree of the vacuum consumable electrode arc furnace to be below 3.0Pa, the smelting current to be 15-35 kA and the smelting voltage to be 23-40V, firstly reducing the smelting speed to be 14-20 kg/min when the consumable electrode is smelted at 900-1500 kg, secondly reducing the smelting speed to be 12-17 kg/min when the consumable electrode is smelted at 1500-2000 kg, and starting entering a feeding stage when the consumable electrode is 200-500 kg in residual weight, wherein the current reduction speed is gradually reduced, and the cooling time after smelting is not less than 9 hours.
5. The preparation method for improving the composition uniformity of the large-size titanium alloy ingot according to claim 4, wherein the melting speed of the third melting is reduced according to the slope of 17kg/min → 14kg/min → 12 kg/min.
6. The preparation method for improving the composition uniformity of the large-size titanium alloy ingot according to claim 4, wherein the melting speed of the third melting is reduced according to the slope of 20kg/min → 17kg/min → 14 kg/min.
7. The preparation method for improving the component uniformity of the large-size titanium alloy ingot according to claim 1, wherein the total weight of the ingredients is 4000-8000 kg.
8. The method of claim 1, wherein the titanium alloy ingot comprises any one of TC4-DT, TC17, TC 18.
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| CN112458305A (en) * | 2020-10-27 | 2021-03-09 | 新疆湘润新材料科技有限公司 | Preparation method of large TC4 titanium alloy ingot |
| CN112501449A (en) * | 2021-02-01 | 2021-03-16 | 湖南湘投金天科技集团有限责任公司 | High-uniformity titanium metal ingot smelting method |
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| CN113278812A (en) * | 2021-05-21 | 2021-08-20 | 东莞市诺德金属科技有限公司 | Vacuum consumable melting method for high-Mo-content Ti-Mo alloy homogeneous ingot |
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| CN115386753A (en) * | 2022-08-17 | 2022-11-25 | 西部超导材料科技股份有限公司 | Preparation method of WSTi6421 titanium alloy |
| CN115386753B (en) * | 2022-08-17 | 2023-08-15 | 西部超导材料科技股份有限公司 | Preparation method of WSTi6421 titanium alloy |
| CN116716501A (en) * | 2023-08-07 | 2023-09-08 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy for aerospace and smelting process thereof |
| CN116716501B (en) * | 2023-08-07 | 2023-10-31 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy for aerospace and smelting process thereof |
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