CN115821088B - Induction smelting intermittent ingot pulling type titanium alloy ingot casting method for semi-continuous casting - Google Patents
Induction smelting intermittent ingot pulling type titanium alloy ingot casting method for semi-continuous casting Download PDFInfo
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- 230000006698 induction Effects 0.000 title claims abstract description 122
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 119
- 238000003723 Smelting Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000005266 casting Methods 0.000 title claims abstract description 25
- 238000009749 continuous casting Methods 0.000 title claims abstract description 16
- 239000000498 cooling water Substances 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000000155 melt Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims description 62
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 46
- 229910052802 copper Inorganic materials 0.000 claims description 46
- 239000010949 copper Substances 0.000 claims description 46
- 230000008569 process Effects 0.000 claims description 33
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 238000007711 solidification Methods 0.000 claims description 10
- 230000008023 solidification Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005242 forging Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 description 45
- 239000000203 mixture Substances 0.000 description 42
- 230000007246 mechanism Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000005204 segregation Methods 0.000 description 7
- 238000009616 inductively coupled plasma Methods 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention provides a method for improving component uniformity of a titanium alloy ingot by induction smelting intermittent ingot pulling type semi-continuous casting. The method is characterized by precisely controlling the setting of the melt quantity, the induction heating power, the cooling water flow and the descending distance of the solidified ingot in each batch and the optimal combination thereof, wherein the setting range of the induction heating power is 300-1200kW, the setting range of the cooling water flow is 0.5-3.0m 3/h, and the setting range of the descending distance of the solidified ingot is 180-300mm. Through the optimized combination and accurate control of the titanium alloy ingot casting process and parameters, the uniformity of the whole components of the titanium alloy ingot is effectively improved, particularly the uniformity of the components of a titanium alloy ingot joint area is improved, and the high-quality smelting of the titanium alloy ingot cast by induction smelting intermittent ingot pulling type semi-continuous casting is hopefully realized, so that the production requirements of aerospace-grade titanium alloy forgings are further met.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to an induction smelting intermittent ingot pulling type semi-continuous casting titanium alloy ingot casting method for improving component uniformity of a titanium alloy ingot casting.
Background
The titanium alloy has high specific strength and good corrosion resistance, has wide application prospect in the field of aerospace, and can be used for producing large complex thin-wall forgings. The titanium alloy cast ingot for forging is required to have uniform cast ingot components, high density and uniform structure. At present, a vacuum consumable arc (VAR) furnace is basically adopted for smelting the titanium alloy ingot, and the requirement of the titanium alloy ingot for aerospace-level forging can be met generally through over 3 VAR smelting processes. However, the VAR method has long production period and high requirement on smelting raw materials, and partial raw materials are easy to be insufficiently melted and directly fused with an ingot matrix, so that the partial segregation of the ingot is serious, and the partial segregation is difficult to eliminate even if the VAR method is adopted for smelting for many times, so that the VAR method cannot meet the high-quality smelting requirement of the titanium alloy ingot.
The vacuum induction smelting method can homogenize the temperature distribution and the components of a molten pool under the vacuum condition by induction heating and electromagnetic stirring, reduce macroscopic segregation and microscopic segregation, ensure that smelting raw materials are sufficiently melted, effectively remove low-density impurities and high-density impurities, and realize high-quality smelting of high-chemical-activity alloys such as titanium, zirconium and the like by one-time smelting. However, the current vacuum induction melting method has limited magnetic permeability and power of a water-cooled copper crucible used for melting high-chemical-activity alloy, the inner diameter size of the available water-cooled copper crucible is limited, large-scale ingots cannot be produced by single-batch melting, and the maximum weight of the ingots is about 50kg in a single batch. Chinese patent 202010743280.0 discloses a vacuum induction smelting method of titanium and titanium alloy cast ingots, which realizes single-batch smelting of titanium and titanium alloy cast ingots with the maximum weight of 100kg, and realizes continuous feeding, induction smelting and continuous ingot pulling in vacuum to realize the weight of more than 100kg and the diameter of up toCompared with a VAR smelting method, the preparation of the homogeneous and high-purity titanium and titanium alloy cast ingot has relatively low requirements on the quality of titanium alloy raw materials, does not need to press electrodes, and can obtain the high-quality titanium alloy cast ingot through one-time smelting. The chemical components of different positions in the axial direction of the titanium alloy cast ingot prepared by the method are basically consistent, but the component distribution in a plurality of radial directions of the cast ingot needs to be further improved. Chinese patent 202110826723.7 discloses a vacuum induction melting furnace for titanium alloy or zirconium alloy ingot casting and an ingot casting method, wherein the vacuum induction melting furnace is matched with a liftable water-cooling copper ingot drawing mechanism under a split hollow copper crucible to assist the mechanism in realizing an intermittent ingot drawing type semi-continuous casting method without damaging vacuum in the furnace, so that large-size titanium alloy or zirconium alloy ingot casting can be produced, the produced ingot can reach 500kg or more, the uniformity of components of the large-size ingot casting prepared by the method is to be improved along with the improvement of the specification of the ingot casting, and the uniformity of components of an ingot casting joint area on the intermittent ingot drawing type semi-continuous casting ingot casting is not easy to control.
By adopting the method for casting the titanium alloy ingot by adopting the induction smelting intermittent ingot pulling type semicontinuous casting, the solidified ingots with different melt amounts are moved by the same descending distance in the induction smelting process, so that the ingots smelted by the previous batch of raw materials are easy to cause atomic diffusion and even remelting due to induction heating, so that the components in the ingot joint region are unevenly distributed, and the ingot joint region forms a local component segregation defect. In addition, if the power of induction heating is not matched with the cooling effect of the water-cooled copper crucible properly, particularly as the diameter of the ingot is increased, the non-uniformity of component distribution is extremely easy to generate in the radial direction inside the ingot, segregation defects which are difficult to control are formed, the segregation defects are not easy to eliminate in post-treatment, and the performance of parts is seriously affected.
In order to improve the component uniformity of the joint area and the radial direction of the ingot of the induction smelting intermittent ingot pulling titanium alloy ingot, the field needs to develop a new process control method for realizing high-quality smelting of the induction smelting intermittent ingot pulling semi-continuous casting titanium alloy ingot and better meeting the production requirements of aerospace-grade titanium alloy forgings.
Disclosure of Invention
The invention aims to improve the overall component uniformity of an induction smelting intermittent ingot pulling titanium alloy ingot by accurate process control, and mainly improve the component uniformity of a large-scale titanium alloy ingot joint area, and provides an induction smelting intermittent ingot pulling type semi-continuous casting titanium alloy ingot casting method.
The aim of the invention is achieved by the following technical scheme:
An induction smelting intermittent ingot pulling type semi-continuous casting titanium alloy ingot casting method adopts an intermittent ingot pulling type induction smelting furnace and a smelting process thereof, and is characterized in that: the method is used for precisely controlling key smelting process parameters, and comprises the setting and optimizing combination of the quantity of smelting melt, induction heating power, cooling water flow and solidifying ingot descending distance of each batch, and specifically comprises the following process conditions:
(1) Setting a batch according to the weight of the ingot and the amount of the smelting melt in each batch, equally dividing and determining the weight of the smelting titanium alloy raw materials in each batch according to the weight of the ingot, placing the titanium alloy raw materials smelted in the first batch into a water-cooling copper crucible in an intermittent ingot pulling type induction smelting furnace, setting the induction heating power to be 300-1200kW, setting the cooling water flow to be 0.5-3.0m 3/h, closing an induction power supply after the raw materials are completely melted, and continuously controlling the cooling water flow in the water-cooling copper crucible until the ingot is solidified;
(2) Setting a solidification ingot descending distance of an intermittent ingot pulling process according to the height of each batch of melted titanium alloy ingots, wherein the solidification ingot descending distance is 180-300mm, and simultaneously completing the feeding process of the second batch of melted titanium alloy raw materials; switching on an induction power supply, setting the induction heating power to be 300-1200kW, setting the cooling water flow to be 0.5-3.0m 3/h, switching off the induction power supply after the titanium alloy raw material is completely melted, and continuously controlling the cooling water flow in the water-cooled copper crucible until the cast ingot is solidified;
(3) Repeating the step (2) for a plurality of times until the titanium alloy raw materials which are evenly divided into a plurality of batches to be smelted are all added into a crucible, and smelting is completed to obtain a titanium alloy cast ingot.
Further, the control range of the amount of the smelting melt in each batch is 50-100kg, the control range of the descending distance of the solidified ingot is 220-280mm, the control range of the power of the induction heat source is 500-1000kW, and the control range of the cooling water flow is 1.0-2.5m 3/h.
Further, the control range of the smelting melt quantity of each batch is 90-100kg, the control range of the descending distance of the solidified ingot is 235-260mm, the control range of the power of the induction heat source is 900-1000kW, and the control range of the cooling water flow is 2.2-2.5m 3/h.
And the optimal combination is realized, the quantity of the smelting melt in each batch is controlled to be 100kg, the descending distance control range of the solidified ingot is 260mm, the power control range of the induction heat source is 1000kW, and the control range of the cooling water flow is 2.5m 3/h.
Compared with the prior art, the invention has the following outstanding advantages and effects:
1. In the process of intermittent ingot pulling type semicontinuous casting of titanium alloy ingot by induction smelting, the invention determines the matching parameters of induction heating power and cooling water flow and the corresponding descending distance of the solidified ingot according to the set same melt quantity of each batch of smelting, and can standardize key production parameters of the induction heating power, the cooling water flow and the descending distance of the solidified ingot in the process of smelting each batch of raw materials by optimizing and precisely controlling the combined process parameters, thereby improving the stability of the smelting quality of each batch of raw materials.
2. The invention effectively controls the component uniformity of the ingot joint area in the radial direction, improves the integral component uniformity of the titanium alloy ingot cast by the induction smelting intermittent ingot pulling type semi-continuous casting, is particularly suitable for preparing the large-diameter titanium alloy ingot with increased difficulty in controlling the component uniformity of the titanium alloy ingot in the radial direction along with the increase of the diameter of the ingot, and is expected to realize high-quality smelting of the titanium alloy ingot cast by the induction smelting intermittent ingot pulling type semi-continuous casting so as to further meet the production requirements of aerospace-grade titanium alloy forgings.
Drawings
FIG. 1 is a schematic diagram of a titanium alloy ingot casting process depicting two batch raw material smelting in a batch ingot pulling induction melting furnace;
In the figure: 1 is a cooling water pipeline, 2 is an induction coil, 3 is a water-cooled copper crucible, 4 is a second batch of smelting ingots, 5 is an ingot joint area, 6 is a first batch of smelting ingots (indicated as an area in a dotted line frame) before intermittent ingot pulling, 7 is a first batch of smelting ingots after intermittent ingot pulling, and 8 is an intermittent ingot pulling mechanism dummy ingot head.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
As shown in FIG. 1, the invention uses a schematic diagram of the internal structure of an intermittent ingot-pulling induction smelting furnace to describe a schematic diagram of the casting process of a titanium alloy ingot for smelting two batches of raw materials. An intermittent ingot-pulling induction smelting furnace shown in fig. 1 is adopted, and dummy ingot head 8 and inner diameter size of an intermittent ingot-pulling mechanism are equal to each otherThe water-cooled copper crucible 3 with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible 3 and the amount of melted melt in each batch, and the method for smelting 50kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
step one: the method comprises the steps of (1) fully melting 50kg of TC4 titanium alloy raw materials in a water-cooled copper crucible to obtain a melt with the height of about 400mm, equally dividing the raw materials into two batches for smelting in order to prevent overflow of the melt, wherein the amount of the smelted melt in each batch is 25kg, pumping the vacuum degree of an intermittent ingot-pulling type induction smelting furnace to 0.5Pa, and placing the 25kgTC titanium alloy raw materials smelted in the first batch in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction smelting furnace; setting the induction heating power of the induction coil 2 to 300kW, setting the cooling water flow rate of the cooling water pipeline 1 to 0.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline 1 to be maintained to be 0.5m 3/h, and solidifying the cast ingot to obtain a first batch of smelted cast ingots 6, namely an area in a dotted line frame of FIG. 1.
Step two: TC4 titanium alloy in a melt amount of 25kgSetting the descending distance h of the solidified ingot to be 200mm when the height of the water-cooled copper crucible 3 is about 200mm, and pulling down the ingot 6 smelted in the first batch before intermittent ingot pulling to the position of the ingot 7 smelted in the first batch after intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 25kgTC 4.
Step three: setting the induction heating power of the induction coil 2 to 300kW, setting the cooling water flow rate of the cooling water pipeline 1 to 0.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate to be maintained to be 0.5m 3/h to solidify the second batch of smelting ingots 4, namely completing the whole smelting of the embodiment, and obtaining the alloy with the diameter of aboutThe 50kgTC titanium alloy ingot with the height of about 353mm, the ingot joint zone 5, i.e. the zone where the second batch of melted ingot 4 is fused with the first batch of melted ingot 7, and the position where the chemical composition of the ingot joint zone 5 is sampled can be determined according to the height of the first batch of melted ingot 7.
In this example, the chemical composition was measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of the composition measurement at different positions of the 50kgTC titanium alloy ingot in table 1 showed that the maximum chemical composition deviation in the axial direction of the ingot in example 1 was 0.04%, the maximum chemical composition deviation in the radial direction was 0.03%, the chemical composition in the joined region 5 of the ingot was 0.06% and the maximum chemical composition in the non-joined region was substantially identical to the chemical composition in the axial direction, the radial direction, and the joined region of the 50kg TC4 titanium alloy ingot.
Table 1 determination of composition of the 50kgTC4 titanium alloy ingots prepared in example 1 at different locations
Example 2
As shown in FIG. 1, the invention uses a schematic diagram of the internal structure of an intermittent ingot-pulling induction smelting furnace to describe a schematic diagram of the casting process of a titanium alloy ingot for smelting two batches of raw materials. An intermittent ingot-pulling induction smelting furnace shown in fig. 1 is adopted, and dummy ingot head 8 and inner diameter size of an intermittent ingot-pulling mechanism are equal to each otherThe water-cooled copper crucible 3 with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible 3 and the amount of molten mass smelted in each batch, and the method for smelting 200kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
Step one: the method comprises the steps of (1) fully melting 200kg of TC4 titanium alloy raw materials in a water-cooled copper crucible to obtain a melt with the height of about 400mm, uniformly dividing the raw materials into two batches for smelting in order to prevent overflow of the melt, wherein the amount of the smelted melt in each batch is 100kg, pumping the vacuum degree of an intermittent ingot-pulling type induction smelting furnace to 0.5Pa, and placing the 100kgTC titanium alloy raw materials smelted in the first batch in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction smelting furnace; setting the induction heating power of the induction coil 2 to 1200kW, setting the cooling water flow rate of the cooling water pipeline 1 to 3.0m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline 1 to be 3.0m 3/h, and solidifying the cast ingot to obtain a first batch of smelted cast ingots 6, namely an area in a dotted line frame of FIG. 1.
Step two: TC4 titanium alloy in a melt amount of 100kgSetting the descending distance h of the solidified ingot to be 200mm when the height of the water-cooled copper crucible 3 is about 200mm, and pulling down the ingot 6 smelted in the first batch before intermittent ingot pulling to the position of the ingot 7 smelted in the first batch after intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 100kgTC 4.
Step three: setting the induction heating power of the induction coil 2 to 1200kW, setting the cooling water flow rate of the cooling water pipeline 1 to 3.0m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate to be maintained to 3.0m 3/h to solidify the second batch of smelting ingots 4, namely completing the whole smelting of the embodiment, and obtaining the alloy with the diameter of about200KgTC titanium alloy ingots with a height of about 353mm, wherein the ingot joint zone 5 is the zone where the second batch of melted ingots 4 and the first batch of melted ingots 7 are fused, and the position for sampling the chemical composition of the ingot joint zone 5 can be determined according to the height of the first batch of melted ingots 7.
In this example, chemical components were measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of measuring the components at different positions of 200kg of the titanium alloy ingot in table 2 showed that the maximum deviation of chemical components in the axial direction of the ingot in example 2 was 0.04%, the maximum deviation of chemical components in the radial direction was 0.09%, the deviation of chemical components in the joined region 5 of the ingot from the maximum chemical components in the non-joined region was 0.08%, and the chemical components in the axial direction, the radial direction, and the joined region of the titanium alloy ingot of 200kg of TC4 were substantially identical.
Table 2 determination of composition of 200kgTC4 titanium alloy ingots prepared in example 2 at different locations
Example 3
As shown in FIG. 1, the invention uses a schematic diagram of the internal structure of an intermittent ingot-pulling induction smelting furnace to describe a schematic diagram of the casting process of a titanium alloy ingot for smelting two batches of raw materials. An intermittent ingot-pulling induction smelting furnace shown in fig. 1 is adopted, and dummy ingot head 8 and inner diameter size of an intermittent ingot-pulling mechanism are equal to each otherThe water-cooled copper crucible 3 with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible 3 and the amount of molten mass smelted in each batch, and the method for smelting 100kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
Step one: 100kg of TC4 titanium alloy raw materials are completely melted in a water-cooled copper crucible with the melt height of about 550mm, the water-cooled copper crucible cannot be completely received in one batch, the raw materials are required to be equally divided into two batches to be melted, the amount of melted melt in each batch is 50kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and the 50kgTC titanium alloy raw materials melted in the first batch are placed in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction melting furnace; setting the induction heating power of the induction coil 2 to be 500kW, enabling the cooling water flow rate of the cooling water pipeline 1 to be 1.0m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline 1 to be maintained at 1.0m 3/h, and solidifying the cast ingot to obtain a first batch of smelted cast ingots 6, namely an area in a dotted line frame of FIG. 1.
Step two: TC4 titanium alloy in a melt amount of 50kgSetting the descending distance h of the solidified ingot to 275mm when the height of the water-cooled copper crucible 3 is about 275mm, and pulling down the ingot 6 smelted in the first batch to the position of the ingot 7 smelted in the first batch after intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 50kgTC 4.
Step three: setting the induction heating power of the induction coil 2 to be 500kW, setting the cooling water flow rate of the cooling water pipeline 1 to be 1.0m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate to be maintained to be 1.0m 3/h to solidify the second batch of smelting ingots 4, namely completing the whole smelting of the embodiment, and obtaining the alloy with the diameter of aboutThe position of the ingot joint zone 5, i.e. the zone where the second batch of melted ingots 4 and the first batch of melted ingots 7 are fused, of the 100kgTC, 4 titanium alloy ingots with a height of about 490mm can be determined according to the height of the first batch of melted ingots 7.
In this example, the chemical composition was measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of the composition measurement at different positions of 100kg of the titanium alloy ingot of table 3 showed that the maximum chemical composition deviation in the axial direction of the ingot of example 3 was 0.04%, the maximum chemical composition deviation in the radial direction was 0.03%, the chemical composition deviation in the joined region 5 of the ingot was 0.07%, and the chemical composition in the axial direction, the radial direction, and the joined region of the titanium alloy ingot of 100kg were substantially identical.
TABLE 3 determination of composition of 100kgTC4 titanium alloy ingots prepared in example 3 at different locations
Example 4
As shown in FIG. 1, the invention uses a schematic diagram of the internal structure of an intermittent ingot-pulling induction smelting furnace to describe a schematic diagram of the casting process of a titanium alloy ingot for smelting two batches of raw materials. An intermittent ingot-pulling induction smelting furnace shown in fig. 1 is adopted, and dummy ingot head 8 and inner diameter size of an intermittent ingot-pulling mechanism are equal to each otherThe water-cooled copper crucible 3 with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible 3 and the amount of molten mass smelted in each batch, and the method for smelting 110kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
Step one: the method comprises the steps of (1) completely melting 110kg of TC4 titanium alloy raw materials in a water-cooled copper crucible to a melt height of about 450mm, wherein the water-cooled copper crucible cannot be completely received in one batch, equally dividing the raw materials into two batches for smelting, wherein the amount of the smelted melt in each batch is 55kg, pumping the vacuum degree of an intermittent ingot-pulling type induction smelting furnace to 0.5Pa, and placing the 55kgTC titanium alloy raw materials smelted in the first batch in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction smelting furnace; setting the induction heating power of the induction coil 2 to 650kW, setting the cooling water flow rate of the cooling water pipeline 1 to 1.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline 1 to be maintained to 1.5m 3/h, and solidifying the cast ingot to obtain a first batch of smelted cast ingots 6, namely the area in the dotted line frame of FIG. 1.
Step two: TC4 titanium alloy in a melt amount of 55 kg/minSetting the descending distance h of the solidified ingot to 225mm when the height of the water-cooled copper crucible 3 is about 225mm, and pulling down the ingot 6 smelted in the first batch to the position of the ingot 7 smelted in the first batch after intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 55kgTC 4.
Step three: setting the induction heating power of the induction coil 2 to 650kW, setting the cooling water flow rate of the cooling water pipeline 1 to 1.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate to be maintained to be 1.5m 3/h to solidify the second batch of smelting ingots 4, namely completing the whole smelting of the embodiment, and obtaining the alloy with the diameter of about110KgTC titanium alloy ingots with a height of about 396mm, wherein the ingot joint area 5 is the area where the second batch of melted ingots 4 and the first batch of melted ingots 7 are fused, and the position for sampling the chemical composition of the ingot joint area 5 can be determined according to the height of the first batch of melted ingots 7.
In this example, the chemical composition was measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of the composition measurement at different positions of 110kg of the titanium alloy ingot of table 4 showed that the maximum chemical composition deviation in the axial direction of the ingot of example 4 was 0.05%, the maximum chemical composition deviation in the radial direction was 0.05%, the chemical composition deviation in the joining region 5 of the ingot was 0.08%, and the chemical composition deviation in the axial direction, the radial direction, and the joining region of the titanium alloy ingot of 110kg of the titanium alloy ingot were substantially identical.
TABLE 4 determination of composition of 110kgTC4 titanium alloy ingots prepared in example 4 at different locations
Example 5
As shown in FIG. 1, the invention uses a schematic diagram of the internal structure of an intermittent ingot-pulling induction smelting furnace to describe a schematic diagram of the casting process of a titanium alloy ingot for smelting two batches of raw materials. An intermittent ingot-pulling induction smelting furnace shown in fig. 1 is adopted, and dummy ingot head 8 and inner diameter size of an intermittent ingot-pulling mechanism are equal to each otherThe water-cooled copper crucible 3 with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible 3 and the amount of molten mass smelted in each batch, and the method for smelting 200kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
Step one: 200kg of TC4 titanium alloy raw materials are completely melted in a water-cooled copper crucible with the melt height of about 520mm, the water-cooled copper crucible cannot be completely received in one batch, the raw materials are required to be equally divided into two batches to be melted, the amount of melted melt in each batch is 100kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and the 100kgTC titanium alloy raw materials melted in the first batch are placed in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction melting furnace; setting the induction heating power of the induction coil 2 to 1000kW, setting the cooling water flow rate of the cooling water pipeline 1 to 2.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline 1 to be maintained at 2.5m 3/h, and solidifying the cast ingot to obtain a first batch of smelted cast ingots 6, namely the area in the dotted line frame of FIG. 1.
Step two: TC4 titanium alloy in a melt amount of 100kgSetting the descending distance h of the solidified ingot to 260mm when the height of the water-cooled copper crucible 3 is about 260mm, and pulling down the ingot 6 smelted in the first batch to the position of the ingot 7 smelted in the first batch after intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 100kgTC 4.
Step three: setting the induction heating power of the induction coil 2 to 1000kW, setting the cooling water flow rate of the cooling water pipeline 1 to 2.5m 3/h, closing the power supply of the induction coil 2 after the raw materials are completely melted, controlling the cooling water flow rate to be maintained to 2.5m 3/h to solidify the second batch of smelting ingots 4, namely completing the whole smelting of the embodiment, and obtaining the alloy with the diameter of about200KgTC titanium alloy ingots with a height of about 461mm, wherein the ingot joint zone 5 is the zone where the second batch of melted ingots 4 and the first batch of melted ingots 7 are fused, and the position for sampling the chemical composition of the ingot joint zone 5 can be determined according to the height of the first batch of melted ingots 7.
In this example, the chemical composition was measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of the composition measurement at different positions of 200kg of the titanium alloy ingot in table 5 showed that the maximum chemical composition deviation in the axial direction of the ingot in example 5 was 0.04%, the maximum chemical composition deviation in the radial direction was 0.06%, the chemical composition in the joined region 5 of the ingot was 0.08% and the maximum chemical composition in the non-joined region was substantially identical to the chemical composition in the axial direction, the radial direction and the joined region of the titanium alloy ingot of 200kg of TC4.
TABLE 5 determination of composition of 200kgTC titanium alloy ingots prepared in example 5 at different locations
Example 6
An intermittent ingot-pulling induction melting furnace of example 5 was used, and the dummy ingot head and the inner diameter size of the intermittent ingot-pulling mechanism were as followsThe water-cooled copper crucible with the height of 400mm optimizes three key process parameters of induction heating power, cooling water flow and solidification ingot descending distance according to the inner diameter of the water-cooled copper crucible and the amount of molten mass smelted in each batch, and the method for smelting 360kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
Step one: 360kg of TC4 titanium alloy raw materials are completely melted in a water-cooled copper crucible with the melt height of about 940mm, the water-cooled copper crucible cannot be completely received in one batch, the raw materials are required to be equally divided into four batches to be melted, the amount of melted melt in each batch is 90kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and the 90kgTC titanium alloy raw materials melted in the first batch are placed in the water-cooled copper crucible in the intermittent ingot-pulling type induction melting furnace; setting the induction heating power of the induction coil to 900kW, setting the cooling water flow rate of a cooling water pipeline to 2.2m 3/h, closing the power supply of the induction coil after the raw materials are completely melted, controlling the cooling water flow rate in the cooling water pipeline to be maintained at 2.2m 3/h, and solidifying the ingot to obtain the first batch of smelting ingots.
Step two: TC4 titanium alloy in a melt amount of 90kgSetting the descending distance of the solidified ingot to 235mm when the height of the water-cooled copper crucible is about 235mm, and pulling down the ingot melted in the first batch to the position of the ingot melted in the first batch after intermittent ingot pulling by the dummy ingot head of the intermittent ingot pulling mechanism, wherein the ingot pulling speed is 10mm/min, and simultaneously completing the feeding process of the titanium alloy raw material in the second batch 90 kgTC.
Step three: setting the induction heating power of the induction coil to 900kW, setting the cooling water flow rate of a cooling water pipeline to 2.2m 3/h, closing the power supply of the induction coil after the raw materials are completely melted, and controlling the cooling water flow rate to be maintained at 2.2m 3/h to solidify the ingot, thereby obtaining a second batch of smelting ingots.
Step four: repeating the third step twice until the titanium alloy raw materials which are evenly divided into four batches to be smelted are all added into a crucible to be smelted, and the diameter is aboutThe 360kgTC titanium alloy ingot with the height of about 830mm, wherein the ingot joint area is the area where each batch of melted ingot is fused, and the position for sampling the chemical components of the ingot joint area can be determined according to the height of the first batch of melted ingot.
In this example, chemical components were measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer, and the results of measuring components at different positions of 360kg of the TC4 titanium alloy ingot in table 6 showed that the maximum chemical component deviation in the axial direction of the ingot of example 6 was 0.05%, the maximum chemical component deviation in the radial direction was 0.07%, the chemical component deviation in the joined region 5 of the ingot was 0.08%, and the chemical components in the axial direction, the radial direction, and the joined region of the TC4 titanium alloy ingot of 360kg were substantially identical.
TABLE 6 determination of composition of 360kg TC4 titanium alloy ingots prepared in example 6 at different locations
In summary, the chemical compositions of the different positions of the TC4 titanium alloy cast ingots prepared in examples 1-6 are basically consistent, the maximum chemical composition deviation of the cast ingot in the axial direction is 0.05%, the maximum chemical composition deviation in the radial direction is 0.09%, and the chemical composition deviation of the cast ingot joint region and the non-joint region is 0.08%, so that the induction smelting intermittent ingot pulling type semicontinuous casting TC4 titanium alloy cast ingots prepared by the method not only keep basically consistent compositions in the axial direction, but also keep basically consistent compositions in the radial direction and the joint region.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (4)
1. An induction smelting intermittent ingot pulling type semi-continuous casting titanium alloy ingot casting method adopts an intermittent ingot pulling type induction smelting furnace and a smelting process thereof, and is characterized in that: the method is used for precisely controlling key smelting process parameters, and comprises the setting and optimizing combination of the quantity of smelting melt, induction heating power, cooling water flow and solidifying ingot descending distance of each batch, and specifically comprises the following process conditions:
(1) Setting a batch according to the weight of the ingot and the amount of the smelting melt in each batch, equally dividing and determining the weight of the smelting titanium alloy raw materials in each batch according to the weight of the ingot, placing the titanium alloy raw materials smelted in the first batch into a water-cooling copper crucible in an intermittent ingot pulling type induction smelting furnace, setting the induction heating power to be 300-1200 kW, and the cooling water flow to be 0.5-3.0 m 3/h, closing an induction power supply after the raw materials are completely melted, and continuously controlling the cooling water flow in the water-cooling copper crucible until the ingot is solidified;
(2) Setting a solidification ingot descending distance of an intermittent ingot pulling process according to the height of each batch of melted titanium alloy ingots, wherein the solidification ingot descending distance is 180-300 mm, and simultaneously completing the feeding process of the second batch of melted titanium alloy raw materials; switching on an induction power supply, setting the induction heating power to be 300-1200 kW, setting the cooling water flow to be 0.5-3.0 m 3/h, switching off the induction power supply after the titanium alloy raw material is completely melted, and continuously controlling the cooling water flow in the water-cooled copper crucible until the cast ingot is solidified;
(3) Repeating the step (2) for a plurality of times until the titanium alloy raw materials which are evenly divided into a plurality of batches to be smelted are all added into a crucible, and smelting is completed to obtain a titanium alloy cast ingot.
2. A method of induction melting batch ingot pulling type semi-continuous casting of titanium alloy ingot in accordance with claim 1, wherein: the control range of the melt quantity for smelting each batch is 50-100 kg, the control range of the descending distance of a solidified ingot is 220-280 mm, the control range of the induction heating power is 500-1000 kW, and the control range of the cooling water flow is 1.0-2.5 m 3/h.
3. A method of induction melting batch ingot pulling semi-continuous casting of titanium alloy ingot according to claim 1 or 2, wherein: the control range of the melt quantity for smelting each batch is 90-100 kg, the control range of the descending distance of a solidified ingot is 235-260 mm, the control range of the induction heating power is 900-1000 kW, and the control range of the cooling water flow is 2.2-2.5 m 3/h.
4. A method of induction melting batch ingot pulling type semi-continuous casting of titanium alloy ingot in accordance with claim 3, wherein: the amount of the melted melt for each batch is controlled to be 100 kg, the descending distance control range of the solidified ingot is 260 mm, the control range of the induction heating power is 1000 kW, and the control range of the cooling water flow is 2.5 m 3/h.
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