CN109402431B - Preparation method of Ti6Al7Nb titanium alloy ingot - Google Patents
Preparation method of Ti6Al7Nb titanium alloy ingot Download PDFInfo
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Abstract
The invention belongs to the technical field of nonferrous metal processing, and discloses a preparation method of a Ti6Al7Nb titanium alloy ingot, which is suitable for phi 560-phi 72And smelting a Ti6Al7Nb titanium alloy ingot with the specification of 0 mm. The method comprises the following steps: firstly, sponge titanium, AlNbTi alloy, Al bean and TiO2Mixing materials according to the required proportion of GB/T3620.1; uniformly mixing, pressing into an electrode block, and performing vacuum plasma welding on the electrode block to prepare a consumable electrode; then carrying out three times of vacuum consumable arc melting on the consumable electrode, controlling the melting speed in the last melting, and entering a feeding stage in the later stage, wherein the melting speed is gradually reduced, the reserved weight of the consumable electrode is 30-60 kg, and the melting speed is 0kg/min, the current of 4-6 kA is kept for 40-100 min, and the depth of a molten pool is gradually reduced; and cooling, and performing surface machining to obtain a finished cast ingot.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metal processing, and particularly relates to a preparation method of a Ti6Al7Nb titanium alloy ingot.
Background
As a metal material for human body implantation, the material has good mechanical properties and corrosion resistance, and also has good biocompatibility; widely used metallic materials for surgical implantation are three major types of stainless steel, drill-base alloys, and titanium alloys.
At present, the Ti6Al7Nb titanium alloy has gradually replaced pure titanium and Ti6Al4V alloy due to the characteristics of high elastic modulus, good processability, excellent biocompatibility and the like, and is applied to the field of surgical implants.
However, since the content of the alloy element Nb easy to segregate in the Ti6Al7Nb alloy is up to 7%, the Nb element is easy to segregate in the ingot by adopting a smelting process similar to other conventional titanium alloys, so that the uniformity of the components of the ingot is poor, the results of poor structural uniformity, substandard mechanical properties and the like are caused, and the clinical application requirements of the medical material are difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a Ti6Al7Nb titanium alloy ingot, which realizes the effective control of the component uniformity and the yield of a large-ingot Ti6Al7Nb ingot by selecting reasonable raw material types and formulating reasonable smelting process parameters.
The purpose of the invention is realized by the following technical scheme: a preparation method of a Ti6Al7Nb titanium alloy ingot specifically comprises the following steps:
(1) preparing raw materials, selecting sponge titanium, AlNbTi alloy, Al beans and TiO2As a raw material for batching, the batching is completed according to the proportion required by GB/T3620.1;
(2) mixing and pressing into an electrode block;
(3) assembling and welding the electrode blocks in the step (2) to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), controlling the melting process to be below 5.0Pa, the melting current to be 30-40 KA and the melting voltage to be 30-40V, controlling the cooling time after melting to be not less than 5 hours, controlling the melting speed in the third time of vacuum consumable arc melting, entering a feeding stage in the later stage of melting, and gradually reducing the melting speed to finally obtain a Ti6Al7Nb titanium alloy cast ingot;
(5) and (4) carrying out surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
Further, the total weight of the ingredients of the raw materials prepared in the step (1) is 3000-6000 kg.
Further, the step (2) of mixing and pressing into the electrode block specifically comprises:
(2.1) fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing;
and (2.2) pressing the mixed material mixed in the step (2.1) into an electrode block by using an oil press, wherein the pressing pressure is 30-38 MPa.
Further, 8000t of oil presses are selected as the oil presses in the step (2.2).
Further, the welding of the electrode block in the step (3) adopts vacuum plasma welding.
Further, the step (4) of performing vacuum arc melting on the consumable electrode in the step (3) to obtain a Ti6Al7Nb titanium alloy ingot, specifically comprising:
(4.1) carrying out first vacuum arc melting, wherein a crucible with the diameter of phi 560mm is adopted, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 30-40 KA, the melting voltage is 30-40V, the arc stabilizing current is 20-30A direct current, and the cooling time after melting is not less than 5 hours;
(4.2) carrying out secondary vacuum consumable arc melting by using a crucible with the diameter phi of 640mm, controlling the pre-vacuum to be below 0.8Pa/min, the vacuum degree to be below 4.0Pa, the melting speed to be 8-16 kg/min and the melting voltage to be 34-40V in the melting process, and cooling for not less than 5 hours after melting;
(4.3) carrying out third vacuum consumable electrode arc melting by using a crucible with the diameter of 720mm, and controlling the gas leakage rate to be below 0.8Pa/min, the vacuum degree to be below 4.0Pa, the melting speed to be 8-16 kg/min and the melting voltage to be 34-40V in the melting process; feeding is started when the consumable electrode is smelted to have a residual weight of 200-450 kg, the smelting speed is reduced step by step, when the reserved weight of the consumable electrode reaches 30-60 kg and the smelting speed is 0kg/min, the temperature is kept for 40-100 min under the current of 4-6 KA, the molten pool is lifted step by utilizing the heat preservation time, and the cooling time after smelting is not less than 5 hours.
Further, the step (5) of performing surface machining on the Ti6Al7Nb titanium alloy ingot of the step (4) specifically includes:
and (5.1) carrying out surface scalping, flaw detection and riser sawing on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
Therefore, the beneficial effects of the invention are as follows: the Ti6Al7Nb titanium alloy ingot smelting preparation method provided by the invention is suitable for smelting preparation of Ti6Al7Nb titanium alloy ingots with the specification of phi 560-phi 720mm, adopts a vacuum consumable arc melting (VAR) method for smelting, strictly controls the smelting current, the arc stabilizing current and the smelting voltage in the smelting process, and improves the alloying effect of the ingot and the component uniformity; when the total weight of ingredients is 3000-6000 kg, feeding is carried out when the residual weight of the consumable electrode is 200-450 kg in the later stage of the last smelting, the melting speed is reduced step by step in the feeding stage, after the melting speed is 0kg/min, the constant lifting of a molten pool is realized by adopting a small current of 4-6 KA and the heat preservation time of 40-100 min, the depth of the molten pool is continuously reduced, the problems of serious Nb element segregation, poor alloy element component uniformity and low yield of a Ti6Al7Nb titanium alloy cast ingot are solved, the transverse and longitudinal components of the cast ingot are uniformly distributed, and the yield of the whole ingot is over 94%.
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the following examples.
Example 1:
the invention provides a preparation method of a Ti6Al7Nb titanium alloy ingot, which is suitable for smelting and preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm, and specifically comprises the following steps:
(1) preparing raw materials, selecting sponge titanium, AlNbTi alloy, Al beans and TiO2As a raw material for batching, the batching is completed according to the proportion required by GB/T3620.1;
(2) mixing and pressing into an electrode block;
(3) assembling and welding the electrode blocks in the step (2) to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), wherein the vacuum degree of the melting process is controlled to be 5.0Pa
The smelting current is 30-40 KA, the smelting voltage is 30-40V, the cooling time after smelting is not less than 5 hours, the third vacuum consumable arc smelting is controlled by the smelting speed, the feeding stage is carried out in the later stage of smelting, the smelting speed is gradually reduced, and finally Ti6Al7Nb titanium alloy cast ingots are obtained;
(5) and (4) carrying out surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
Further, the total weight of the raw materials prepared in the step (1) is 3000-6000 kg.
Further, the step (2) of mixing and pressing into the electrode block specifically comprises:
(2.1) fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing;
and (2.2) pressing the mixed material mixed in the step (2.1) into an electrode block by using an oil press, wherein the pressing pressure is 30-38 MPa.
Further, 8000t of oil presses are selected as the oil presses in the step (2.2).
Further, the welding of the electrode block in the step (3) adopts vacuum plasma welding.
Further, the step (4) of performing vacuum arc melting on the consumable electrode in the step (3) to obtain a Ti6Al7Nb titanium alloy ingot, specifically comprising:
(4.1) carrying out first vacuum arc melting, wherein a crucible with the diameter of phi 560mm is adopted, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 30-40 KA, the melting voltage is 30-40V, the arc stabilizing current is 20-30A direct current, and the cooling time after melting is not less than 4 hours;
(4.2) carrying out secondary vacuum consumable arc melting by using a crucible with the diameter phi of 640mm, controlling the pre-vacuum to be below 0.8Pa/min, the vacuum degree to be below 4.0Pa, the melting speed to be 8-16 kg/min and the melting voltage to be 34-40V in the melting process, and cooling for not less than 5 hours after melting;
(4.3) carrying out third vacuum consumable electrode arc melting by using a crucible with the diameter of 720mm, and controlling the gas leakage rate to be below 0.8Pa/min, the vacuum degree to be below 4.0Pa, the melting speed to be 8-16 kg/min and the melting voltage to be 34-40V in the melting process; feeding is started when the consumable electrode is smelted to have a residual weight of 200-450 kg, the smelting speed is reduced step by step, when the reserved weight of the consumable electrode reaches 30-60 kg and the smelting speed is 0kg/min, the temperature is kept for 40-100 min under the current of 4-6 KA, the molten pool is lifted step by utilizing the heat preservation time, and the cooling time after smelting is not less than 5 hours.
Further, the step (5) of performing surface machining on the Ti6Al7Nb titanium alloy ingot of the step (4) specifically includes:
and (5.1) carrying out surface scalping, flaw detection and riser sawing on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
Example 2:
the invention also provides a preparation method of the Ti6Al7Nb titanium alloy ingot, which is suitable for smelting and preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm, and specifically comprises the following steps:
(1) preparing raw materials: mixing the national standard titanium sponge, AlNbTi alloy, Al bean and TiO2The materials are mixed according to the proportion of Ti-6Al-7Nb-0.11O, and the total weight of the materials is 5500 kg;
(2) mixing materials and pressing into an electrode block: fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing, and pressing the raw materials into an electrode block by using an 8000-ton oil press, wherein the pressing pressure is 35 MPa;
(3) carrying out vacuum plasma welding on the electrode block obtained in the step 2 to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), and specifically:
the first vacuum consumable arc melting is carried out, a crucible with the diameter of phi 560mm is adopted, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 30-40 KA, the melting voltage is 30-40V, the arc stabilizing current is 20-30A direct current, and the cooling time after melting is not less than 4 hours;
the second vacuum consumable electrode arc melting adopts a crucible with the diameter phi of 640mm, the pre-vacuum is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 4.0Pa, the melting speed is 14-15 kg/min, the melting voltage is 34-40V, and the cooling time after melting is not less than 5 hours;
a crucible with the diameter of 720mm is adopted for the third vacuum consumable electrode melting, the gas leakage rate is controlled to be below 0.8Pa/min, the vacuum degree is below 3.0Pa, the melting speed is 12-15 kg/min, the melting voltage is 34-40V, feeding is started when the consumable electrode melting residual weight is 300kg, the melting speed is gradually reduced, when the consumable electrode reserved weight reaches 30kg and the melting speed is 0kg/min, the consumable electrode melting is kept for 70min under the current of 4-6 KA, the molten pool is gradually lifted by utilizing the heat preservation time, and the cooling time after melting is not less than 5 hours;
(5) and (4) carrying out surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot, wherein the weight of a flaw detection saw cut riser is 110kg, the proportion of the riser is 2.00 percent, the weight of scrap is 96kg, the proportion of the riser is 1.75 percent, and the comprehensive yield reaches 94.0 percent.
In addition, in order to verify whether the finished Ti6Al7Nb titanium alloy ingot prepared by the preparation method meets the standard requirements, nine-point sampling is performed on the transverse section of the head of the 720mm ingot obtained by smelting in example 2, and the results of analyzing the uniformity of the integral components of the ingot by five-point sampling in the longitudinal direction of the surface of the ingot are shown in tables 1 and 2:
TABLE 1 ingot head transverse section nine-point sampling results
TABLE 2 longitudinal five-point sampling results of cast ingot surface
As can be seen from table 1: the Ti6Al7Nb ingot casting head has good transverse nine-point component uniformity, the main element deviation is within 2000ppm, and the O element deviation is 100 ppm.
As can be seen from table 2: the obtained Ti6Al7Nb cast ingot has good longitudinal component uniformity, and both the main element and the impurity element meet the standard requirements.
Example 3:
the invention also provides a preparation method of the Ti6Al7Nb titanium alloy ingot, which is suitable for smelting and preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm, and specifically comprises the following steps:
(1) preparing raw materials: mixing the national standard titanium sponge, AlNbTi alloy, Al bean and TiO2Proportioning according to the proportion of Ti-6Al-7Nb-0.11O, wherein the total weight of the ingredients is 5000 kg;
(2) mixing materials and pressing into an electrode block: fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing, and pressing the raw materials into an electrode block by using an 8000-ton oil press, wherein the pressing pressure is 32 MPa;
(3) carrying out vacuum plasma welding on the electrode block obtained in the step 2 to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), and specifically:
the first vacuum consumable arc melting is carried out, a crucible with the diameter of phi 560mm is adopted, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 32-36 KA, the melting voltage is 30-40V, the arc stabilizing current is 20-24A direct current, and the cooling time after melting is not less than 4 hours;
the second vacuum consumable electrode arc melting adopts a crucible with the diameter phi of 640mm, the pre-vacuum is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 4.0Pa, the melting speed is 13-15 kg/min, the melting voltage is 36-40V, and the cooling time after melting is not less than 5 hours;
a crucible with the diameter of 720mm is adopted for the third vacuum consumable electrode melting, the gas leakage rate is controlled to be below 0.8Pa/min, the vacuum degree is below 3.0Pa, the melting speed is 10-14 kg/min, the melting voltage is 35-40V, feeding is started when the consumable electrode melting residual weight is 300kg, the melting speed is gradually reduced, when the consumable electrode reserved weight reaches 30kg and the melting speed is 0kg/min, the consumable electrode melting is kept for 70min under the current of 4-6 KA, the molten pool is gradually lifted by utilizing the heat preservation time, and the cooling time after melting is not less than 5 hours;
(5) and (4) carrying out surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot, wherein the weight of a flaw detection saw cut riser is 76kg, the proportion of the riser is 1.52%, the weight of the scrap is 81kg, the proportion of the riser is 1.62%, and the comprehensive yield reaches 95.2%.
In addition, in order to verify whether the finished Ti6Al7Nb titanium alloy ingot prepared by the preparation method meets the standard requirements, the transverse section of the head of the phi 720mm ingot obtained by smelting in example 3 is subjected to nine-point sampling, and the longitudinal five-point sampling on the surface of the ingot is subjected to analysis on the integral component uniformity of the ingot, and the results are shown in tables 3 and 4:
TABLE 3 ingot head transverse section nine-point sampling results
TABLE 4 longitudinal five-point sampling results of ingot surfaces
As can be seen from table 3: the Ti6Al7Nb ingot casting head has good transverse nine-point component uniformity, the main element deviation is within 2000ppm, and the O element deviation is 100 ppm.
As can be seen from table 4: the obtained Ti6Al7Nb cast ingot has good longitudinal component uniformity, and both the main element and the impurity element meet the standard requirements.
Example 4:
the invention also provides a preparation method of the Ti6Al7Nb titanium alloy ingot, which is suitable for smelting and preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm, and specifically comprises the following steps:
(1) preparing raw materials: mixing the national standard titanium sponge, AlNbTi alloy, Al bean and TiO2Proportioning according to the proportion of Ti-6Al-7Nb-0.11O, wherein the total weight of the proportioning is 4600 kg;
(2) mixing materials and pressing into an electrode block: fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing, wherein the pressing pressure is 35 MPa;
(3) carrying out vacuum plasma welding on the electrode block obtained in the step 2 to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), and specifically:
the first vacuum consumable arc melting adopts a crucible with the diameter of phi 560mm, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 34-38 KA, the melting voltage is 30-40V, the arc stabilizing current adopts 28-30A direct current, and the cooling time after melting is not less than 4 hours;
the second vacuum consumable electrode arc melting adopts a crucible with the diameter phi of 640mm, the pre-vacuum is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 4.0Pa, the melting speed is 12-15 kg/min, the melting voltage is 34-40V, and the cooling time after melting is not less than 5 hours;
and a crucible with the diameter of 720mm is adopted for the third vacuum consumable electrode melting, the gas leakage rate is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 2.0Pa, the melting speed is 13-16 kg/min, the melting voltage is 34-40V, feeding is started when the consumable electrode melting residual weight is 400kg, the melting speed is gradually reduced, when the consumable electrode reserved weight reaches 40kg and the melting speed is 0kg/min, the consumable electrode melting is kept for 90min under the current of 4-6 KA, the molten pool is gradually lifted by utilizing the heat preservation time, and the cooling time after melting is not less than 5 hours.
(5) And (3) performing surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot, wherein the weight of a flaw detection saw cut riser is 91kg, the proportion of the riser is 1.98%, the weight of the scrap is 85kg, the proportion of the riser is 1.85%, and the comprehensive yield reaches 95.1%.
In order to verify whether the Ti6Al7Nb titanium alloy finished product ingot prepared by the preparation method meets the standard requirements, nine-point sampling is carried out on the transverse section of the head of the phi 720mm ingot obtained in the example 4, and the results of analyzing the uniformity of the integral components of the ingot by five-point sampling in the longitudinal direction of the surface of the ingot are shown in tables 5 and 6:
TABLE 5 ingot head transverse section nine-point sampling results
TABLE 6 longitudinal five-point sampling results of ingot surfaces
As can be seen from table 5: the Ti6Al7Nb ingot casting head has good transverse nine-point component uniformity, the main element deviation is within 2000ppm, and the O element deviation is 100 ppm.
As can be seen from table 6: the obtained Ti6Al7Nb cast ingot has good longitudinal component uniformity, and both the main element and the impurity element meet the standard requirements.
Furthermore, in order to prevent Nb segregation of the ingot and ensure the component uniformity of the ingot, the invention selects high-quality sponge titanium as a basic component and AlNbTi alloy, Al beans and TiO2The mixture is mixed, and the range of the main components of the cast ingot is controlled within the GB/T3620.1 range. The uniformity of the raw materials in the electrode is realized through material distribution and mixing; the pressing pressure is controlled to be 30-38 MPa, so that the compactness of the electrode block under the condition of large alloy addition is ensured.
In addition, the welding of the electrode is carried out in a vacuum plasma welding mode, so that the consumable electrode is prevented from being oxidized during welding, and the sufficient welding strength is ensured; the method adopts a vacuum consumable arc melting (VAR) method to carry out three times of melting, strictly controls the vacuum degree, the leakage rate, the melting current, the arc stabilizing current and the melting voltage in the melting process, strictly controls the melting current and the arc stabilizing current for the first time of melting, strictly controls the melting speed and the feeding time for the third time of melting, improves the alloying effect of alloy elements in the ingot and the element distribution homogenization degree, and obtains higher yield.
In summary, the method for preparing the Ti6Al7Nb titanium alloy ingot by smelting is suitable for preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm by smelting, solves the problems of low finished product rate, poor uniformity of the head components of the ingot and segregation of alloy elements of the Ti6Al7Nb titanium alloy ingot, and has the finished product rate of more than 94 percent and uniform head components of the ingot. The transverse and longitudinal component range of main elements of Al and Nb is not more than 2000ppm, and the transverse and longitudinal range of element O is not more than 200 ppm.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It will be understood that the invention is not limited to the details described above, but is capable of various modifications and changes without departing from the scope thereof. The scope of the invention is limited only by the claims.
Claims (5)
1. A preparation method of a Ti6Al7Nb titanium alloy ingot is characterized in that the preparation method is suitable for smelting and preparing the Ti6Al7Nb titanium alloy ingot with the specification of phi 560-phi 720mm, and specifically comprises the following steps:
(1) preparing raw materials, selecting sponge titanium, AlNbTi alloy, Al beans and TiO2The raw materials are mixed according to the required ratio of GB/T3620.1, and the total weight of the mixed materials is 3000-6000 kg;
(2) mixing and pressing into an electrode block;
(3) assembling and welding the electrode blocks in the step (2) to obtain a consumable electrode;
(4) carrying out three times of vacuum arc melting on the consumable electrode in the step (3), controlling the melting process to be below 5.0Pa, the melting current to be 30-40 KA and the melting voltage to be 30-40V, controlling the cooling time after melting to be not less than 5 hours, controlling the melting speed in the third time of vacuum consumable arc melting, entering a feeding stage in the later stage of melting, and gradually reducing the melting speed to finally obtain a Ti6Al7Nb titanium alloy cast ingot; the third vacuum arc melting specifically comprises the following steps:
the first vacuum arc melting is carried out, a crucible with the diameter of phi 560mm is adopted, the gas leakage rate is controlled to be below 1.2Pa/min, the vacuum degree is controlled to be below 5.0Pa, the melting current is 30-40 KA, the melting voltage is 30-40V, the arc stabilizing current is 20-30A direct current, and the cooling time after melting is not less than 5 hours;
the second vacuum consumable electrode arc melting adopts a crucible with the diameter phi of 640mm, the pre-vacuum is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 4.0Pa, the melting speed is 8-16 kg/min, the melting voltage is 34-40V, and the cooling time after melting is not less than 5 hours;
the third vacuum consumable electrode arc melting adopts a crucible with the diameter of 720mm, the air leakage rate is controlled to be below 0.8Pa/min, the vacuum degree is controlled to be below 4.0Pa, the melting speed is 8-16 kg/min, and the melting voltage is 34-40V; feeding is started when the consumable electrode is smelted to obtain 200-450 kg of residual weight, the smelting speed is reduced step by step, when the reserved weight of the consumable electrode reaches 30-60 kg, the smelting speed is 0kg/min, heat is preserved for 40-100 min under the current of 4-6 KA, the molten pool is lifted step by utilizing the heat preservation time, and the cooling time after smelting is not less than 5 hours;
(5) and (4) carrying out surface machining on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
2. The method for preparing a Ti6Al7Nb titanium alloy ingot according to claim 1, wherein the step (2) mixes and presses into an electrode block, specifically comprising:
step (2.1), fully and uniformly mixing the raw materials prepared in the step (1) to complete mixing;
and (2.2) pressing the mixed material mixed in the step (2.1) into an electrode block by using an oil press, wherein the pressing pressure is 30-38 MPa.
3. The method of producing a Ti6Al7Nb titanium alloy ingot according to claim 2, wherein the oil press in step (2.2) is 8000 t.
4. A method for producing a Ti6Al7Nb titanium alloy ingot according to claim 1, wherein the welding of the electrode block in step (3) is vacuum plasma welding.
5. The method of producing a Ti6Al7Nb titanium alloy ingot according to claim 1, wherein the step (5) of surface machining the Ti6Al7Nb titanium alloy ingot of step (4) specifically includes:
and (5.1) carrying out surface scalping, flaw detection and riser sawing on the Ti6Al7Nb titanium alloy ingot obtained in the step (4) to obtain a Ti6Al7Nb titanium alloy finished product ingot.
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| CN111057887B (en) * | 2019-11-18 | 2021-11-05 | 西部超导材料科技股份有限公司 | Preparation method of high-uniformity TA18 titanium alloy ingot for aviation hydraulic pipe |
| CN111014877B (en) * | 2019-12-03 | 2021-12-31 | 西部超导材料科技股份有限公司 | Method for welding titanium alloy ingot casting in furnace |
| CN110904341B (en) * | 2019-12-04 | 2021-07-09 | 西部超导材料科技股份有限公司 | Cooling method of titanium alloy ingot |
| CN111575510A (en) * | 2020-05-18 | 2020-08-25 | 西部超导材料科技股份有限公司 | Method for preparing TC25 titanium alloy ingot and ingot prepared by method |
| CN117344166B (en) * | 2023-12-05 | 2024-03-08 | 成都先进金属材料产业技术研究院股份有限公司 | High-homogeneity titanium alloy cast ingot and preparation method thereof |
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| CN107177753B (en) * | 2017-06-29 | 2019-01-15 | 西部超导材料科技股份有限公司 | A method of controlling big specification TC4-DT titan alloy casting ingot solidified structure |
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