CN115821088A - Induction smelting intermittent ingot-pulling type semi-continuous casting titanium alloy ingot casting method - Google Patents
Induction smelting intermittent ingot-pulling type semi-continuous casting titanium alloy ingot casting method Download PDFInfo
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- 230000006698 induction Effects 0.000 title claims abstract description 120
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 83
- 238000005266 casting Methods 0.000 title claims abstract description 27
- 238000009749 continuous casting Methods 0.000 title claims abstract description 18
- 238000003723 Smelting Methods 0.000 title claims description 59
- 239000000498 cooling water Substances 0.000 claims abstract description 68
- 238000002844 melting Methods 0.000 claims abstract description 54
- 230000008018 melting Effects 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 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 38
- 239000000155 melt Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000005304 joining Methods 0.000 abstract description 33
- 238000005242 forging Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 description 50
- 239000000203 mixture Substances 0.000 description 23
- 230000007246 mechanism Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000009616 inductively coupled plasma Methods 0.000 description 6
- 238000005204 segregation Methods 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 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
- 239000012768 molten material Substances 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
- 238000011156 evaluation Methods 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006467 substitution reaction 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
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
The invention provides a titanium alloy ingot casting method for improving component uniformity of a titanium alloy ingot by induction melting intermittent ingot pulling type semi-continuous casting. The method is precise control and comprises the setting and the optimized combination of the melting quantity, the induction heating power, the cooling water flow, the descending distance of a solidified cast ingot in each batch, wherein the setting range of the induction heating power is 300-1200kW, and the setting range of the cooling water flow is 0.5-3.0m 3 And h, setting the descending distance of the solidified cast ingot to be 180-300mm. Through the titanium alloy ingot casting process and the optimized combination and accurate control of parameters, the integral component uniformity of the titanium alloy ingot is effectively improved, especially the component uniformity of the joining area of the titanium alloy ingot is improved, and the high-quality melting of the titanium alloy ingot casted by induction melting intermittent ingot pulling type semi-continuous casting is hopefully realizedSmelting to further meet the production requirements of aerospace-grade titanium alloy forgings.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to a titanium alloy ingot casting method for improving the component uniformity of a titanium alloy ingot by induction melting intermittent ingot pulling type semi-continuous casting.
Background
The titanium alloy has wide application prospect in the field of aerospace due to high specific strength and good corrosion resistance, and can be used for producing large-scale complex thin-wall forgings. The titanium alloy ingot for forging requires uniform ingot components, high density and uniform structure. At present, a titanium alloy ingot is smelted by a vacuum consumable arc (VAR) furnace, and the requirement of the titanium alloy ingot for aerospace-grade forging can be met generally by more than 3 times of VAR smelting. However, the VAR method has long production period and high requirements on smelting raw materials, and part of the raw materials are easily and insufficiently melted and are directly fused with an ingot casting matrix, so that the local segregation of the ingot casting is serious, and the partial segregation is not easily eliminated even if the VAR method is adopted for smelting for multiple times, so that the VAR method cannot meet the high-quality smelting requirement of the titanium alloy ingot casting.
The vacuum induction melting method can homogenize the temperature distribution and components of a molten pool by induction heating and electromagnetic stirring under the vacuum condition, reduce macro and micro segregation, has low requirements on raw materials by vacuum induction melting, can ensure that the melting raw materials are fully melted, effectively removes low and high-density impurities, and can realize high-quality melting of high-chemical activity alloys such as titanium, zirconium and the like by one-time melting. However, the permeability and power of a water-cooled copper crucible used for smelting high-chemical activity alloy by the current vacuum induction smelting method are limited, the size of the inner diameter of the available water-cooled copper crucible is limited, large ingots cannot be produced by single-batch smelting, and the maximum ingot weight is about 50kg in a single batch. Chinese patent 202010743280.0 discloses a vacuum induction melting method of titanium and titanium alloy ingots, which realizes single batch melting of titanium and titanium alloy ingots with maximum weight of 100kg, and realizes weight of more than 100kg and diameter of up to 100kg by vacuum continuous feeding, induction melting and continuous ingot pulling
Compared with the VAR smelting method, the preparation method of the homogeneous and high-purity titanium and titanium alloy ingots has relatively low requirement on the quality of titanium alloy raw materials, does not need to press electrodes, and can obtain high-quality titanium alloy ingots through one-time smelting. The chemical compositions of different positions of the titanium alloy ingot prepared by the method are basically consistent, but the composition distribution in a plurality of radial directions of the ingot is still 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, the method is matched with a liftable water-cooled copper ingot pulling mechanism under a split hollow water-cooled copper crucible, and is used for assisting the mechanism to realize an intermittent ingot pulling type semi-continuous casting method without breaking the vacuum in the furnace, so that large-size titanium alloy or zirconium alloy ingot casting can be produced, the ingot casting produced by the method can reach 500kg or even higher, the component uniformity of the large-size ingot casting prepared by the method needs to be improved along with the improvement of the ingot casting specification, and the component uniformity of an ingot casting joint area on the ingot casting by intermittent ingot pulling type semi-continuous casting is not easy to control.
The method for casting the titanium alloy ingot by adopting the induction melting intermittent ingot pulling type semi-continuous casting moves the same descending distance to the solidified ingots with different melt amounts in the induction melting process, so that the ingots smelted by the raw materials of the previous batch are easy to cause atomic diffusion and even remelting due to induction heating, the components in the ingot jointing area are unevenly distributed, and the local component segregation defect is formed in the ingot jointing area. In addition, if the power of induction heating is not properly matched with the cooling effect of the water-cooled copper crucible, particularly as the diameter of the cast ingot is increased, the nonuniformity of component distribution is easily generated in the inner part of the cast ingot along the radial direction, so that the segregation defect which is difficult to control is formed, and the segregation defect is difficult to eliminate in the post-treatment process, so that the performance of parts is seriously influenced.
In order to improve the component uniformity of an engagement area of an induction smelting intermittent ingot pulling titanium alloy ingot and the radial direction of the ingot, a new process control method needs to be researched and developed in the field, so that the high-quality smelting of the induction smelting intermittent ingot pulling type semi-continuous casting titanium alloy ingot is realized, and the production requirement of an aerospace-grade titanium alloy forging is better met.
Disclosure of Invention
The invention aims to improve the integral component uniformity of an induction melting intermittent ingot-pulling titanium alloy ingot through accurate process control, mainly improve the component uniformity of a large-scale titanium alloy ingot splicing zone, and provide a titanium alloy ingot casting method for induction melting intermittent ingot-pulling type semi-continuous casting.
The purpose of the invention is realized 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 accurately controlling key smelting process parameters, and comprises the setting and the optimized combination of the quantity of smelting melt in each batch, the induction heating power, the cooling water flow, the descending distance of a solidified ingot, and the following process conditions:
(1) Setting batches according to the weight of the cast ingot and the amount of the molten metal in each batch, equally dividing the weight of the titanium alloy raw material smelted in each batch according to the weight of the cast ingot, placing the titanium alloy raw material smelted in the first batch into a water-cooled copper crucible in an intermittent ingot-pulling type induction smelting furnace, setting the induction heating power to be 300-1200kW and the cooling water flow to be 0.5-3.0m 3 Stopping the induction power supply after the raw materials are completely melted, and continuously controlling the flow of cooling water in the water-cooled copper crucible until the cast ingot is solidified;
(2) Setting a descending distance of a solidified ingot of the intermittent ingot pulling process according to the height of each batch of smelted titanium alloy ingots, wherein the descending distance of the solidified ingot is 180-300mm, and finishing the feeding process of the second batch of smelted titanium alloy raw materials; turning on an induction power supply, setting the induction heating power to be 300-1200kW, and the cooling water flow to be 0.5-3.0m 3 Stopping the induction power supply after the titanium alloy raw material is completely melted, and continuously controlling the flow of cooling water in the water-cooled copper crucible until the cast ingot is solidified;
(3) And (3) repeating the step (2) for a plurality of times until all the titanium alloy raw materials which are equally divided into a plurality of batches are added into the crucible, and finishing smelting to obtain the titanium alloy ingot.
Further, the control range of the melt quantity of each batch of smelting is 50-100kg, and the control range of the descending distance of the solidified cast ingot is220-280mm, the power control range 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 melt quantity of each batch of smelting is 90-100kg, the control range of the descending distance of the solidified cast 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。
The optimal optimization combination is realized, the melt volume of each batch of smelting is controlled to be 100kg, the control range of the descending distance of a solidified ingot is 260mm, the control range of the power of an induction heat source is 1000kW, and the control range of the flow of cooling water is 2.5m 3 /h。
Compared with the prior art, the invention has the following outstanding advantages and effects:
1. in the process of smelting the titanium alloy ingot by the induction smelting intermittent ingot-pulling type semi-continuous casting method, the matching parameters of the induction heating power and the cooling water flow and the corresponding downstream distance of the solidified ingot are determined according to the set same melt quantity in each batch of smelting, and the key production parameters of the induction heating power, the cooling water flow and the downstream distance of the solidified ingot in the smelting process of each batch of raw materials can be standardized by optimizing and accurately controlling the combined process parameters, so that the stability of the smelting quality of each batch of raw materials is improved.
2. The invention effectively controls the component uniformity of the radial direction and the ingot casting joining area, improves the integral component uniformity of the titanium alloy ingot cast by induction melting intermittent ingot pulling type semi-continuous casting, is particularly suitable for preparing the large-diameter titanium alloy ingot cast with the difficulty of controlling the component uniformity of the titanium alloy ingot cast in the radial direction along with the increase of the diameter of the ingot, and is hopeful to realize the high-quality melting of the titanium alloy ingot cast by induction melting intermittent ingot pulling type semi-continuous casting so as to further meet the production requirement of aerospace-grade titanium alloy forging pieces.
Drawings
FIG. 1 is a schematic view of a process for a titanium alloy ingot casting process in which the structure of an intermittent ingot-pulling type induction melting furnace describes two batches of raw material melting;
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 joining region, 6 is an ingot smelted in the first batch before intermittent ingot drawing (indicated as an area in a dotted line frame), 7 is an ingot smelted in the first batch after intermittent ingot drawing, and 8 is an ingot puller of an intermittent ingot drawing mechanism.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in FIG. 1, the invention uses a schematic structural diagram in an intermittent ingot-pulling type induction melting furnace to describe a process schematic diagram of a titanium alloy ingot casting process for smelting two batches of raw materials. The intermittent ingot-pulling type induction melting furnace shown in FIG. 1 is adopted, and the dummy bar head 8 and the inner diameter of the intermittent ingot-pulling mechanism are of the size
The method is characterized in that a 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 quantity of molten metal in each batch, and the method for smelting 50kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt of 50kg of TC4 titanium alloy raw material completely melted in a water-cooled copper crucible is about 400mm, in order to prevent the melt from overflowing, the raw material is divided into two batches equally for melting, the amount of the melt in each batch is 25kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and 25kg of TC4 titanium alloy raw material melted in the first batch is placed in the water-cooled copper crucible 3 in the intermittent ingot-pulling type induction melting furnace; the induction heating power of the induction coil 2 is set to 300kW, and the cooling water flow of the cooling water pipeline 1 is set to 0.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water in the cooling water pipeline 1 is controlled to be maintained at 0.5m 3 And/h, solidifying the ingot to obtain a first batch of melted ingot 6, namely the area in the dashed box of FIG. 1.
Step two: per 25kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible 3 is about 200mm, the descending distance h of the solidified ingot is set to be 200mm, the ingot 6 which is smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot 7 which is smelted in the first batch after the intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the 25kg TC4 titanium alloy raw material in the second batch is completed.
Step three: the induction heating power of the induction coil 2 is set to 300kW, and the cooling water flow of the cooling water pipeline 1 is set to 0.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water is controlled to be maintained at 0.5m 3 H solidifying the second batch of molten ingots 4, i.e. completing the entire melting of the present example, to obtain a diameter of about
A 50kgTC4 titanium alloy ingot having a height of about 353mm, and an ingot joining zone 5, i.e., a region where the second-batch melted ingot 4 is fused with the first-batch melted ingot 7, and a position at which the chemical composition of the ingot joining zone 5 is sampled may be determined according to the height of the first-batch melted ingot 7.
In this example, the inductively coupled plasma emission spectrometer was used to measure chemical components at different positions of the ingot to obtain the measurement results of the components at different positions of the 50kgTC4 titanium alloy ingot in table 1, and the results showed that the maximum chemical component deviation in the axial direction of the ingot in example 1 was 0.04%, the maximum chemical component deviation in the radial direction was 0.03%, the chemical component of the ingot joining region 5 was 0.06% and the maximum chemical component of the non-joining region was 0.06%, and the chemical components in the axial direction, the radial direction and the joining region of the 50kg TC4 titanium alloy ingot were substantially the same.
TABLE 1 compositional evaluation of 50kgTC4 titanium alloy ingots prepared in example 1 at various positions
Example 2
As shown in figure 1, the invention uses intermittent ingot pulling type feelingThe structural schematic diagram in the smelting furnace is used for describing the process schematic diagram of the titanium alloy ingot casting process for smelting two batches of raw materials. The intermittent ingot-pulling type induction melting furnace shown in FIG. 1 is adopted, and the dummy bar head 8 and the inner diameter of the intermittent ingot-pulling mechanism are of the size
The method is characterized in that a 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 quantity of molten metal in each batch, and the method for smelting 200kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt which is completely melted by 200kg of TC4 titanium alloy raw material in a water-cooled copper crucible is about 400mm, in order to prevent the overflow of the melt, the raw material is equally divided into two batches for smelting, the quantity of the molten material in each batch is 100kg, the vacuum degree of an intermittent ingot-pulling type induction smelting furnace is pumped to 0.5Pa, and 100kg of TC4 titanium alloy raw material smelted in the first batch is placed in the water-cooled copper crucible 3 in the intermittent ingot-pulling type induction smelting furnace; the induction heating power of the induction coil 2 is set to 1200kW, and the cooling water flow of the cooling water pipeline 1 is set to 3.0m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water in the cooling water pipeline 1 is controlled to be maintained at 3.0m 3 And/h, solidifying the ingot to obtain a first batch of melted ingot 6, namely the area in the dashed box of FIG. 1.
Step two: per 100kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible 3 is about 200mm, the descending distance h of the solidified ingot is set to be 200mm, the ingot 6 which is smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot 7 which is smelted in the first batch after the intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the 100kgTC4 titanium alloy raw material in the second batch is completed.
Step three: the induction heating power of the induction coil 2 is set to 1200kW, and the cooling water flow of the cooling water pipeline 1 is set to 3.0m 3 H, originalAfter the materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water is controlled to be maintained at 3.0m 3 H solidifying the second batch of molten ingots 4, i.e. completing the entire melting of the present example, to obtain a diameter of about
A 200kgTC4 titanium alloy ingot having a height of about 353mm, and an ingot joining region 5, i.e., a region where the second-batch melted ingot 4 is fused with the first-batch melted ingot 7, and a position at which the chemical composition of the ingot joining region 5 is sampled may be determined according to the height of the first-batch melted ingot 7.
In this example, the inductively coupled plasma emission spectrometer was used to measure chemical components at different positions of the ingot to obtain the component measurement results of table 2 at different positions of the 200kg TC4 titanium alloy ingot, and the results showed that the maximum chemical component deviation in the axial direction of the ingot in example 2 was 0.04%, the maximum chemical component deviation in the radial direction was 0.09%, the chemical component deviation in the joining region 5 of the ingot and the maximum chemical component deviation in the non-joining region was 0.08%, and the chemical components in the axial direction, the radial direction, and the joining region of the 200kg TC4 titanium alloy ingot were substantially the same.
TABLE 2 measurement of composition of 200kgTC4 titanium alloy ingot prepared in example 2 at various positions
Example 3
As shown in FIG. 1, the invention uses a schematic structural diagram in an intermittent ingot-pulling type induction melting furnace to describe a process schematic diagram of a titanium alloy ingot casting process for smelting two batches of raw materials. The intermittent ingot-pulling type induction melting furnace shown in FIG. 1 is adopted, and the dummy bar head 8 and the inner diameter of the intermittent ingot-pulling mechanism are of the size
Height of 400mThe water-cooled copper crucible 3 of m 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 molten metal amount of each batch, and the melting of 100kg of TC4 titanium alloy ingots in the embodiment specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt of 100kg of TC4 titanium alloy raw material completely melted in a water-cooled copper crucible is about 550mm, the water-cooled copper crucible cannot be completely received in one batch, the raw material needs to be divided into two batches for melting, the amount of the molten material in each batch is 50kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and 50kg of TC4 titanium alloy raw material melted in the first batch is placed in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction melting furnace; the induction heating power of the induction coil 2 is set to be 500kW, and the cooling water flow of the cooling water pipeline 1 is set to be 1.0m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is closed, and the flow of the cooling water in the cooling water pipeline 1 is controlled to be maintained at 1.0m 3 And/h, solidifying the ingot to obtain a first batch of melted ingot 6, namely the area in the dashed box of FIG. 1.
Step two: per 50kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible 3 is about 275mm, the descending distance h of the solidified ingot is set to be 275mm, the ingot 6 which is smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot 7 which is smelted in the first batch after the intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the second batch of 50kgTC4 titanium alloy raw material is completed.
Step three: the induction heating power of the induction coil 2 is set to be 500kW, and the cooling water flow of the cooling water pipeline 1 is set to be 1.0m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water is controlled to be maintained at 1.0m 3 H solidifying the second batch of molten ingots 4, i.e. completing the entire melting of the present example, to obtain a diameter of about
Height of about 490mm 100kgTC4 titanium alloy ingot, and an ingot joining area 5, namely an area where the second-batch melted ingot 4 is fused with the first-batch melted ingot 7, wherein the position for sampling the chemical composition of the ingot joining area 5 can be determined according to the height of the first-batch melted ingot 7.
In this example, the chemical components were measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer to obtain the measurement results of the components at different positions of the 100kg TC4 titanium alloy ingot in table 3, and the results showed that the maximum deviation of the chemical components in the axial direction of the ingot in example 3 was 0.04%, the maximum deviation of the chemical components in the radial direction was 0.03%, the deviation of the chemical components in the joining region 5 of the ingot and the maximum deviation of the chemical components in the non-joining region was 0.07%, and the chemical components in the axial direction, the radial direction and the joining region of the 100kg TC4 titanium alloy ingot were substantially identical.
TABLE 3 compositional evaluation of 100kgTC4 titanium alloy ingots prepared in example 3 at various positions
Example 4
As shown in FIG. 1, the invention uses a schematic structural diagram in an intermittent ingot-pulling type induction melting furnace to describe a process schematic diagram of a titanium alloy ingot casting process for smelting two batches of raw materials. The intermittent ingot-pulling type induction melting furnace shown in FIG. 1 is adopted, and the dummy bar head 8 and the inner diameter of the intermittent ingot-pulling mechanism are of the size
The method is characterized in that a 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 quantity of molten metal in each batch, and the method for smelting 110kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt of 110kg of TC4 titanium alloy raw material completely melted in a water-cooled copper crucible is about 450mm, the water-cooled copper crucible cannot be completely received in one batch, the raw material needs to be divided into two batches for melting, and the amount of the molten melt in each batch is 55kg, pumping the vacuum degree of the intermittent ingot-pulling type induction smelting furnace to 0.5Pa, and placing 55kgTC4 titanium alloy raw material smelted in the first batch into a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction smelting furnace; the induction heating power of the induction coil 2 is set to 650kW, and the cooling water flow of the cooling water pipeline 1 is set to 1.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water in the cooling water pipeline 1 is controlled to be maintained at 1.5m 3 And/h, solidifying the ingot to obtain a first batch of melted ingot 6, namely the area in the dashed box of FIG. 1.
Step two: per 55kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible 3 is about 225mm, the descending distance h of the solidified ingot is set to 225mm, the ingot 6 which is smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot 7 which is smelted in the first batch after the intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the second batch of 55kgTC4 titanium alloy raw material is completed.
Step three: the induction heating power of the induction coil 2 is set to 650kW, and the cooling water flow of the cooling water pipeline 1 is set to 1.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water is controlled to be maintained at 1.5m 3 H solidifying the second batch of molten ingots 4, i.e. completing the entire melting of the present example, to obtain a diameter of about
A 110kgTC4 titanium alloy ingot having a height of about 396mm, and an ingot joining zone 5, i.e., a region where the second melted ingot 4 is fused with the first melted ingot 7, and a position where the chemical composition of the ingot joining zone 5 is sampled may be determined according to the height of the first melted ingot 7.
In this example, the inductively coupled plasma emission spectrometer was used to measure chemical components at different positions of the ingot to obtain the component measurement results of 110kg of TC4 titanium alloy ingot in table 4, and the results showed that the maximum chemical component deviation in the axial direction of the ingot in example 4 was 0.05%, the maximum chemical component deviation in the radial direction was 0.05%, the chemical component deviation in the joining region 5 of the ingot and the maximum chemical component deviation in the non-joining region was 0.08%, and the chemical components in the axial direction, the radial direction and the joining region of the 110kg of TC4 titanium alloy ingot were substantially the same.
TABLE 4 compositional evaluation of 110kgTC4 titanium alloy ingots prepared in example 4 at various positions
Example 5
As shown in FIG. 1, the invention uses a schematic structural diagram in an intermittent ingot-pulling type induction melting furnace to describe a process schematic diagram of a titanium alloy ingot casting process for smelting two batches of raw materials. The intermittent ingot-pulling type induction melting furnace shown in FIG. 1 is adopted, and the dummy bar head 8 and the inner diameter of the intermittent ingot-pulling mechanism are of the size
The method is characterized in that a 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 quantity of molten metal in each batch, and the method for smelting 200kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt of 200kg of TC4 titanium alloy raw material completely melted in a water-cooled copper crucible is about 520mm, the water-cooled copper crucible cannot be completely received in one batch, the raw material needs to be divided into two batches for melting, the amount of the molten material in each batch is 100kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and 100kg of TC4 titanium alloy raw material melted in the first batch is placed in a water-cooled copper crucible 3 in the intermittent ingot-pulling type induction melting furnace; the induction heating power of the induction coil 2 is set to 1000kW, and the cooling water flow of the cooling water pipeline 1 is set to 2.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is closed, and the flow of the cooling water in the cooling water pipeline 1 is controlled to be maintained at 2.5m 3 And/h, solidifying the ingot to obtain a first batch of melted ingot 6, namely the area in the dashed box of FIG. 1.
Step two: per 100kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible 3 is about 260mm, the descending distance h of the solidified ingot is set to be 260mm, the ingot 6 which is smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot 7 which is smelted in the first batch after the intermittent ingot pulling through the dummy ingot head 8 of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the 100kgTC4 titanium alloy raw material in the second batch is completed.
Step three: the induction heating power of the induction coil 2 is set to 1000kW, and the cooling water flow of the cooling water pipeline 1 is set to 2.5m 3 H, after the raw materials are completely melted, the power supply of the induction coil 2 is turned off, and the flow of cooling water is controlled to be maintained at 2.5m 3 H solidifying the second batch of molten ingots 4, i.e. completing the entire melting of the present example, to obtain a diameter of about
A 200kgTC4 titanium alloy ingot having a height of about 461mm, and an ingot joining region 5, i.e., a region where the second melted ingot 4 is fused with the first melted ingot 7, and a position where the chemical composition of the ingot joining region 5 is sampled may be determined according to the height of the first melted ingot 7.
In this example, the inductively coupled plasma emission spectrometer was used to measure chemical components at different positions of the ingot to obtain the component measurement results of table 5 at different positions of the 200kg TC4 titanium alloy ingot, and the results showed that the maximum chemical component deviation in the axial direction of the ingot in example 5 was 0.04%, the maximum chemical component deviation in the radial direction was 0.06%, the chemical component of the ingot joining region 5 was 0.08% and the maximum chemical component of the non-joining region was 0.08%, and the chemical components of the axial direction, the radial direction and the joining region of the 200kg TC4 titanium alloy ingot were substantially identical.
TABLE 5 measurement of composition of 200kgTC4 titanium alloy ingot prepared in example 5 at various positions
Example 6
The intermittent ingot-pulling type induction melting furnace of the same example 5 was used, in which the dimensions of the dummy bar head and the inner diameter of the intermittent ingot-pulling mechanism were set to
The method is characterized in that a 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 quantity of molten metal in each batch, and the method for smelting 360kg of TC4 titanium alloy ingots specifically comprises the following steps and process conditions:
the method comprises the following steps: the height of a melt of 360kg of TC4 titanium alloy raw material completely melted in a water-cooled copper crucible is about 940mm, the water-cooled copper crucible cannot be completely received in one batch, the raw material needs to be divided into four batches for melting, the amount of the molten material in each batch is 90kg, the vacuum degree of an intermittent ingot-pulling type induction melting furnace is pumped to 0.5Pa, and 90kg of TC4 titanium alloy raw material melted in the first batch is 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 and the cooling water flow of the cooling water pipeline to 2.2m 3 H, after the raw materials are completely melted, closing the power supply of the induction coil, and controlling the flow of cooling water in a cooling water pipeline to be maintained at 2.2m 3 And h, solidifying the ingot to obtain a first batch of smelting ingot.
Step two: per 90kg of melt of TC4 titanium alloy in
The height of the water-cooled copper crucible is about 235mm, the descending distance of the solidified ingot is set to be 235mm, the ingot smelted in the first batch before the intermittent ingot pulling is pulled down to the position of the ingot smelted in the first batch after the intermittent ingot pulling through the dummy ingot head of the intermittent ingot pulling mechanism, the ingot pulling speed is 10mm/min, and meanwhile, the feeding process of the 90kgTC4 titanium alloy raw material in the second batch is completed.
Step three: setting the induction heating power of the induction coil to 900kW and the cooling water flow of the cooling water pipeline to 2.2m 3 H, turning off the power supply of the induction coil after the raw materials are completely melted, and controlling the flow of cooling waterMaintained at 2.2m 3 And/h, solidifying the cast ingot to obtain a second batch of smelting cast ingot.
Step four: repeating the third step twice until all the titanium alloy raw materials which are equally divided into four batches are added into the crucible for smelting to obtain the titanium alloy with the diameter of about
The height of the 360kg TC4 titanium alloy ingot is about 830mm, an ingot joint area is an area where the ingots melted in each batch are fused, and the position for sampling the chemical composition of the ingot joint area can be determined according to the height of the ingots melted in the first batch.
In this example, the chemical compositions were measured at different positions of the ingot by using an inductively coupled plasma emission spectrometer to obtain the composition measurement results of 360kg of TC4 titanium alloy ingots in table 6, and the results showed that the maximum chemical composition deviation in the axial direction of the ingot in example 6 was 0.05%, the maximum chemical composition deviation in the radial direction was 0.07%, the chemical composition deviation in the joining region 5 of the ingot and the maximum chemical composition deviation in the non-joining region was 0.08%, and the chemical compositions in the axial direction, the radial direction and the joining region of 360kg of the TC4 titanium alloy ingot were substantially the same.
TABLE 6 measurement of composition of 360kg of TC4 titanium alloy ingot prepared in example 6 at various positions
In summary, the chemical compositions of the TC4 titanium alloy ingots prepared in examples 1 to 6 at different positions were substantially the same, the maximum chemical composition deviation in the axial direction of the ingots was 0.05%, the maximum chemical composition deviation in the radial direction was 0.09%, and the chemical composition deviation in the joining region of the ingots and the maximum chemical composition deviation in the non-joining region was 0.08%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the 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 accurately controlling key smelting process parameters, and comprises the setting and the optimized combination of the quantity of smelting melt in each batch, the induction heating power, the cooling water flow, the descending distance of a solidified ingot, and the following process conditions:
(1) Setting batches according to the weight of the cast ingot and the amount of the molten metal in each batch, equally dividing the weight of the titanium alloy raw material smelted in each batch according to the weight of the cast ingot, placing the titanium alloy raw material smelted in the first batch into a water-cooled copper crucible in an intermittent ingot-pulling type induction smelting furnace, setting the induction heating power to be 300-1200kW and the cooling water flow to be 0.5-3.0m 3 Stopping the induction power supply after the raw materials are completely melted, and continuously controlling the flow of cooling water in the water-cooled copper crucible until the cast ingot is solidified;
(2) Setting a descending distance of a solidified ingot of the intermittent ingot pulling process according to the height of each batch of smelted titanium alloy ingots, wherein the descending distance of the solidified ingot is 180-300mm, and finishing the feeding process of the second batch of smelted titanium alloy raw materials; turning on an induction power supply, setting the induction heating power to be 300-1200kW, and the cooling water flow to be 0.5-3.0m 3 Stopping the induction power supply after the titanium alloy raw material is completely melted, and continuously controlling the flow of cooling water in the water-cooled copper crucible until the cast ingot is solidified;
(3) And (3) repeating the step (2) for a plurality of times until all the titanium alloy raw materials which are equally divided into a plurality of batches are added into the crucible, and finishing smelting to obtain the titanium alloy ingot.
2. According to claim 1The method for the induction melting intermittent ingot-pulling type semi-continuous casting of the titanium alloy ingot is characterized by comprising the following steps: the control range of the melt quantity of each batch of smelting is 50-100kg, the control range of the descending distance of the solidified cast 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。
3. The method for induction melting of a titanium alloy ingot for intermittent ingot pulling type semi-continuous casting according to claim 1 or 2, wherein: the control range of the melt quantity of each batch of smelting is between 90 and 100kg, the control range of the descending distance of the solidified cast ingot is between 235 and 260mm, the control range of the power of the induction heat source is between 900 and 1000kW, and the control range of the cooling water flow is between 2.2 and 2.5m 3 /h。
4. The method of claim 3 for the induction melting of a titanium alloy ingot for intermittent ingot-pulling type semi-continuous casting, wherein: the melt volume of each batch of smelting is controlled at 100kg, the control range of the descending distance of the solidified cast 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。
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