A rolling method of TA19 titanium alloy sheet material

Abstract

The application provides a rolling method of TA19 titanium alloy sheet material, comprising the following steps: S1, slab heating; S2, first fire breakdown rolling; S3, cutting into multiple one-fire rolling slabs; S4, heating the obtained multiple one-fire rolling slabs; S5, water cooling the slabs after S4; S6, heating the cooled slabs; S7, second fire rolling of the slabs after S6 to obtain two-fire rolling slabs; S8, heating the slabs after S7; S9, third fire rolling of the slabs after S8 to obtain three-fire rolling slabs; S10, cutting the three-fire rolling slabs of S9; S11, stacking and combining the obtained multiple three-fire rolling slabs in groups of 2-4, coating isolation paint between the two slabs, and wrapping and welding with wrapping plates every four groups; S12, heating the slabs after S11 wrapping and combining; S13, wrapping rolling of the slabs after S12 heating; and S14, obtaining the finished product TA19 slab by sequentially unwrapping the slabs after S13 wrapping rolling, primary heat treatment, hot straightening, secondary heat treatment and surface treatment.

Description

Technical Field

[0001] This invention relates to the field of titanium and titanium alloy sheet processing technology, specifically to a rolling method for TA19 titanium alloy thin sheet. Background Technology

[0002] The nominal composition of TA19 titanium alloy is Ti-6Al-2Sn-4Zr-2Mo-0.08Si, which can maintain good strength at temperatures up to approximately 540°C. Due to its excellent high-temperature performance, TA19 titanium alloy is mainly used in the aerospace field, especially as the preferred material for aircraft engine compressor discs and rotor blades, while TA19 sheet metal is mainly used in aircraft engine exhaust nozzles.

[0003] TA19 titanium alloy has high alloy strength, poor plastic deformation capacity, narrow processing temperature range, and high resistance to hot deformation. Especially for thin plates around 2mm thick, the plates are prone to cracking during rolling, making it difficult to control the final product shape. Developing a reasonable rolling process, allocating passes and deformation amounts while ensuring target performance is challenging. Furthermore, current patents for TA19 thin plates do not specify a concrete rolling temperature range.

[0004] Therefore, a rolling process is needed that can effectively reduce the risk of TA19 cracking and ensure the production of high-strength TA19 plates. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a rolling process for TA19 (high temperature) titanium alloy thin plates with a higher yield strength ratio and a higher material strength utilization rate. This process combines the processes of billet rolling, water quenching and cladding rolling, and can be used to manufacture high-strength TA19 titanium alloy thin plates.

[0006] The technical problem it aims to solve can be addressed through the following technical solutions.

[0007] A rolling method for TA19 titanium alloy thin sheet includes the following steps:

[0008] Step 1: Place the slab into the heating furnace for heating;

[0009] Step 2: Perform a first-fire rolling process on the heated sheet material from Step 1 to obtain a hot-rolled slab.

[0010] Step 3: Cut the intermediate slab obtained in Step 2 to obtain multiple single-fire rolled slabs;

[0011] Step 4: Heat the multiple slabs obtained in Step 3 in a heating furnace;

[0012] Step 5: Cool the slab after heating in Step 4 with water;

[0013] Step 6: Place the cooled slab from Step 5 into the furnace for heating;

[0014] Step 7: Perform a second rolling process on the slab heated in Step 6 to obtain a two-rolled slab.

[0015] Step 8: Place the cooled slab from Step 7 into the furnace for heating;

[0016] Step 9: Perform a third heat rolling on the slab heated in Step 8 to obtain a three-heat rolled slab;

[0017] Step 10: Divide the three-fire rolled slab from Step 9 into multiple three-fire rolled slabs;

[0018] Step 11: Take the multiple three-fire rolled slabs obtained in Step 10 into groups of 2 to 4, stack them together, apply a protective coating between the two slabs, and use a cladding steel plate to cover and weld the four sides of each stack.

[0019] Step 12: Heat the composite-coated board from Step 11;

[0020] Step 13: Wrap and roll the heated sheet material from Step 12;

[0021] Step 14: Unpack the rolled sheet material from Step 13, perform a first heat treatment, heat straightening, a second heat treatment, and surface treatment to obtain the finished TA19 sheet material.

[0022] In the above technical method: the heating furnace in step S1 is an electric heating furnace, and the furnace is a micro-oxygen environment, with a heating temperature of T. β + (30~50℃), heating time / holding time is 120~180min, slab thickness is 100~150mm.

[0023] In the above technical method: the thickness of the hot-rolled slab in step S2 is 10~25mm, the number of rolling passes is 10~15, the reduction per pass is 8%~20%, and reversing rolling is adopted.

[0024] In the above technical method: the heating furnace in step S4 is an electric heating furnace, and the furnace is a micro-oxygen environment, with a heating temperature of T. β + (30~50℃), heating time / holding time is 30~60min.

[0025] In the above technical method: the time for transferring the heated plate to the water-cooling zone in step S5 is within 50 seconds.

[0026] In the above technical method: in step S5, the plate is water-cooled and then surface-finished and pickled.

[0027] In the above technical method: the heating furnace in step S6 is an electric heating furnace, and the furnace is a micro-oxygen environment, with a heating temperature of T. β - (30~80℃), heating time / holding time is 30~60min.

[0028] In the above technical method: the thickness of the slab in the second rolling process in step S7 is 6~7mm, the number of rolling passes is 5~9, the deformation amount per pass is 2~25%, and reversing rolling is adopted.

[0029] In the above technical method: the heating furnace in step S8 is an electric heating furnace, and the furnace is a micro-oxygen environment, with a heating temperature of T. β - (30~80℃), heating time / holding time is 10~30min.

[0030] In the above technical method: the thickness of the three-fire rolled slab in step S9 is 4~6mm, the number of rolling passes is 1~3, and the deformation amount per pass is 2~5%.

[0031] In the above technical method: In step S11, the cladding steel plate used is Q355 steel plate.

[0032] In the above technical method: the heating furnace in step S12 is an electric heating furnace, and the furnace is a micro-oxygen environment. The heating temperature is 700~900℃, and the heating time / holding time is 30~60min.

[0033] In the above technical method: in step S13, the final thickness of the rolled plate is 2~3mm, the number of rolling passes is 6~10, the deformation per pass is 1~10%, and reversing rolling is adopted.

[0034] In the above technical method: the hot straightening temperature in step S14 is 600~700℃; after surface treatment (mainly referring to pickling and sanding), the thickness of the finished board is 2~2.5mm, the length is 1000~3000mm, and the width is 500~1200mm.

[0035] The present invention has the following advantages over the prior art:

[0036] This invention employs a single-phase region blanking followed by heating and quenching to further refine the grains, controlling the precipitated and grown secondary equiaxed phase grains to be between 0.9 and 2 μm. The resulting sheet material meets standard performance specifications while exhibiting a higher yield strength ratio and higher material strength utilization. Attached Figure Description

[0037] Figure 1 Example 2 shows the sheet material after water cooling following a single-fire blanking process using the method of the present invention;

[0038] Figure 2 This is the state of the sheet metal after the three-fire rolling process using the method of the present invention in Example 2;

[0039] Figure 3 This is the state of the sheet material after finishing at the end of the wrapping and rolling process in Example 2;

[0040] Figure 4 This is a micrograph of the plate material in Example 2 at one magnification.

[0041] Figure 5 This is a micrograph of the substrate from Example 2 at another magnification. Detailed Implementation

[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] This invention provides a rolling method for manufacturing high-strength TA19 titanium alloy plates. By combining multi-pass rolling, controlling deformation, and controlling cooling rate, a fine and uniform rolled microstructure is finally obtained. After heat treatment and surface treatment, a 2-2.5 mm thin plate of high-strength TA19 is obtained.

[0044] Example 1:

[0045] The rolling method for TA19 titanium alloy thin sheet in this embodiment includes the following steps:

[0046] Step 1: Place the 114mm thick slab into an electric heating furnace for heating. The furnace is designed to be in a micro-oxygen environment, and the heating temperature is T. β +40℃, keep warm for 150 minutes.

[0047] Step 2: Perform a first-fire rolling process on the heated sheet material from Step 1. The rolling passes are 10 times, and the reduction per pass is 8%~20%, to obtain a first-fire rolled slab with a thickness of 15mm.

[0048] Step 3: Cut the intermediate slab obtained in Step 2 to obtain multiple single-fire rolled slabs.

[0049] Step 4: Heat the multiple slabs obtained in Step 3 in a heating furnace with a micro-oxygen environment at a heating temperature of T. β +40℃, keep warm for 30 minutes.

[0050] Step 5: Cool the heated slab in step 4 with water for 30 seconds until it reaches room temperature.

[0051] Step 6: Place the cooled slab from Step 5 into the furnace for heating. The furnace is a micro-oxygen environment, and the heating temperature is T. β -50℃, heat preservation time 30min.

[0052] Step 7: The slab heated in Step 6 is subjected to a second rolling process to obtain a two-rolled slab. The thickness of the two-rolled slab is 6.2 mm. The two-roll process consists of 9 passes, with a deformation of 2-25% per pass.

[0053] Step 8: Place the cooled slab from Step 7 into the furnace for heating. The furnace is a micro-oxygen environment, and the heating temperature is T. β -50℃, heat preservation time is 15 minutes.

[0054] Step 9: The slab heated in Step 8 is subjected to a third rolling process to obtain a three-rolled slab. The thickness of the three-rolled slab is 5.2 mm, and the rolling passes are 2 passes, with a deformation of 2-5% per pass.

[0055] Step 10: Divide the three-fire rolled slab from Step 9 into multiple three-fire rolled slabs.

[0056] Step 11: Take the multiple three-fire rolled slabs obtained in Step 10, stack them in pairs, and apply a protective coating between the two slabs. Use Q355 steel plates to cover and weld the edges of each stack of slabs.

[0057] Step 12: Heat the composite-coated board from Step 11 to 880℃ and hold for 45 minutes.

[0058] Step 13: The heated sheet material from Step 12 is clad rolled. The final thickness of the clad rolled slab is 2.5 mm. The rolling passes are 8, with a deformation of 1~10% per pass. Reversed rolling is used.

[0059] Step 14: Unpack the rolled sheet material from Step 13, perform a first heat treatment at 899℃, straighten, perform a second heat treatment at 788℃, and perform surface treatment to obtain the finished TA19 sheet material.

[0060] The properties of the finished board are shown in Table 1 for the 2.2mm board. The board meets the requirements of high strength, elongation greater than or equal to 10%, yield strength ratio of 97%, and flatness of 4mm / m.

[0061] Example 2:

[0062] The rolling method for TA19 titanium alloy thin sheet in this embodiment includes the following steps:

[0063] Step 1: Place the 140mm thick slab into an electric heating furnace for heating. The furnace is designed to be in a micro-oxygen environment, and the heating temperature is T. β +40℃, keep warm for 160 minutes.

[0064] Step 2: Perform a first-fire rolling process on the heated sheet material from Step 1. The rolling passes are 10 times, and the reduction per pass is 8%~20%, to obtain a first-fire rolled slab with a thickness of 15mm.

[0065] Step 3: Cut the intermediate slab obtained in Step 2 to obtain multiple single-fire rolled slabs.

[0066] Step 4: Heat the multiple slabs obtained in Step 3 in a heating furnace with a micro-oxygen environment at a heating temperature of T. β +40℃, keep warm for 30 minutes.

[0067] Step 5: Cool the slab heated in Step 4 with water for 30 seconds until it reaches room temperature.

[0068] Step 6: Place the cooled slab from Step 5 into the furnace for heating. The furnace is a micro-oxygen environment, and the heating temperature is T. β -50℃, heat preservation time 30min.

[0069] Step 7: The slab heated in Step 6 is subjected to a second rolling process to obtain a two-rolled slab. The thickness of the two-rolled slab is 6mm. The two-roll process consists of 9 passes, with a deformation of 2~25% per pass.

[0070] Step 8: Place the cooled slab from Step 7 into the furnace for heating. The furnace is a micro-oxygen environment, and the heating temperature is T. β -50℃, heat preservation time is 15 minutes.

[0071] Step 9: The slab heated in Step 8 is subjected to a third rolling process to obtain a three-rolled slab. The thickness of the three-rolled slab is 4.9 mm, and the rolling passes are 2, with a deformation of 2-5% per pass.

[0072] Step 10: Divide the three-fire rolled slab from Step 9 into multiple three-fire rolled slabs.

[0073] Step 11: Take the multiple three-fire rolled slabs obtained in Step 10, stack them in pairs, and apply a protective coating between the two slabs. Use Q355 steel plates to cover and weld the edges of each stack of slabs.

[0074] Step 12: Heat the composite-coated board from Step 11 to 900℃ and hold for 45 minutes.

[0075] Step 13: The heated sheet material from Step 12 is clad rolled. The final thickness of the clad rolled slab is 2.2 mm. The rolling passes are 8, with a deformation of 1~10% per pass. Reversed rolling is used.

[0076] Step 14: Unpack the rolled sheet material from Step 13, perform a first heat treatment at 899℃, straighten, perform a second heat treatment at 788℃, and perform surface treatment to obtain the finished TA19 sheet material.

[0077] The properties of the finished board are shown in Table 1 for the 2.0mm board. The board meets the requirements of high strength, elongation greater than or equal to 10%, yield strength ratio of 97%, and flatness of 4mm / m.

[0078] Table 1 below shows the tensile mechanical properties of TA19 sheet with a thickness of 2mm.

[0079] Table 1:

[0080]

Claims

1. A rolling method for TA19 titanium alloy thin sheet, characterized in that, Includes the following steps: S1. The slab is placed in a heating furnace for heating; the heating furnace in this step is an electric heating furnace, and the furnace is in a micro-oxygen environment, with a heating temperature of T. β + (30~50℃), heat preservation time is 120~180min, slab thickness is 100~150mm; S2. The heated plate is subjected to the first-fire billet rolling to obtain a hot-rolled billet as an intermediate billet. The thickness of the hot-rolled billet in this step is 10~25mm, the number of rolling passes is 10~15, the reduction per pass is 8%~20%, and reversing rolling is adopted. S3. Cut the intermediate slab obtained in step S2 to obtain multiple single-fire rolled slabs. S4. The multiple single-fire rolled slabs obtained in step S3 are heated in a heating furnace; the heating furnace in this step is an electric heating furnace, and the furnace is in a micro-oxygen environment, with a heating temperature of T. β + (30~50℃), heat preservation time is 30~60min; S5. Cool the slab after heating in step S4 with water. S6. Place the cooled slab from step S5 into a furnace for heating; the furnace in this step is an electric heating furnace, and the furnace is in a micro-oxygen environment, with a heating temperature of T. β - (30~80℃), heat preservation time is 30~60min; S7. The slab heated in step S6 is subjected to a second rolling process to obtain a two-rolled slab. S8. Place the cooled slab from step S7 into a furnace for heating; the furnace in this step is an electric heating furnace, and the furnace is in a micro-oxygen environment, with a heating temperature of T. β - (30~80℃), heat preservation time is 10~30min; S9. The slab heated in step S8 is subjected to a third heat rolling process to obtain a three-heat rolled slab. S10. Divide the three-fire rolled slab from step S9 to obtain multiple three-fire rolled slabs. S11. Take 2 to 4 sheets of the three-fire rolled slabs obtained in step S10 as a group, stack them up and down as a composite, apply isolation coating between the two sheets, and use a covering plate to cover and weld the slabs around each stack. S12. The composite-coated board from step S11 is heated. The heating furnace in this step is an electric heating furnace, and the furnace is in a micro-oxygen environment. The heating temperature is 700~900℃, and the holding time is 30~60min. S13. The heated sheet material in step S12 is subjected to cladding rolling; the final thickness of the cladding rolled sheet material in this step is 2~3mm, the number of rolling passes is 6~10, the deformation per pass is 1~10%, and reversing rolling is adopted. S14. The rolled sheet material from step S13 is unpacked, subjected to a first heat treatment, heat straightening, a second heat treatment, and surface treatment to obtain the finished TA19 sheet material. The heat straightening temperature in this step is 600~700℃. After surface treatment, the finished sheet material has a thickness of 2~2.5mm, a length of 1000~3000mm, and a width of 500~1200mm.

2. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: In step S5, the heated board material is transferred to the water-cooling zone within 50 seconds.

3. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: Step S5, after the plate is water-cooled, also includes surface finishing and pickling processes.

4. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: In step S7, the thickness of the slab rolled in the second heat is 6-7 mm, the number of rolling passes is 5-9, the deformation per pass is 2-25%, and the reversing rolling is adopted.

5. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: In step S9, the thickness of the three-fire rolled slab is 4~6mm, the number of rolling passes is 1~3, and the deformation amount per pass is 2~5%.

6. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: In step S11, the cladding plate used is Q355 steel plate.

7. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: The surface treatment includes acid pickling and sanding steps.

8. The rolling method for TA19 titanium alloy thin sheet according to claim 1, characterized in that: The thickness of the TA19 titanium alloy sheet is 2~2.5mm.

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