Preparation method of RT-1400 high-strength titanium alloy wire for 3D printing

Abstract

The application discloses a preparation method of RT-1400 high-strength titanium alloy wire for 3D printing, and the titanium alloy wire is composed of the following components in mass percentage: Al 4.2-5.2%, V 2.5-3.5%, Cr 1.1-2.1%, Mo 5.1-6.1%, Fe 1.0-2.0%, the balance Ti and inevitable impurity elements; the preparation method comprises the following steps: one, pressing an electrode; two, electrode smelting, forging, rolling and skinning; three, rolling and skinning; four, after skinning, first-stage multi-pass hot drawing; five, second-stage multi-pass hot drawing; six, third-stage multi-pass hot drawing; and seven, skinning and coiling. The application controls the deformation amount of each pass of the hot drawing and the drawing temperature, improves the strength and plasticity matching property of the wire, adopts multi-pass roller die wire drawing, guarantees the quality of the wire, and meets the requirements of various wire feeding 3D printing processes and equipment.

Description

Technical Field

[0001] This invention belongs to the field of materials preparation technology, specifically relating to a method for preparing RT-1400 high-strength titanium alloy wire for 3D printing. Background Technology

[0002] Titanium alloys are widely used in aerospace, marine, and chemical industries due to their high specific strength, good plasticity, and corrosion resistance. RT-1400 titanium alloy, with its low density, high strength, high impact toughness, and good weldability, has broad application prospects in aerospace, marine, and petroleum fields, and is particularly suitable for manufacturing large structural components. Wire-feed 3D printing offers advantages such as simple process flow, high material utilization, high forming efficiency, and the ability to manufacture various complex structures, while its performance is comparable to or superior to forgings, making it particularly suitable for structural component fabrication. In the field of 3D printing technology based on wire feeding, the filaments used are typically 1.2mm in diameter. However, with increasing processing deformation, the strength of RT-1400 titanium alloy increases while its plasticity decreases. Existing filament-making processes cannot produce RT-1400 titanium alloy filaments that meet the quality requirements of wire-feed 3D printing. Therefore, it is urgent to solve the corresponding problems in 3D printing filament preparation and to evaluate filament quality. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a method for preparing RT-1400 high-strength titanium alloy wire for 3D printing. This method improves the strength-plasticity matching of the wire product by controlling the deformation amount and drawing temperature parameters of each hot drawing pass. Combined with a multi-pass roller drawing method, it controls the synchronization and uniformity of the metal flow between the wire surface and the core, effectively preventing defects such as tail shrinkage, porosity, and delamination, thus ensuring the quality of the RT-1400 high-strength titanium alloy wire. This solves the problem that existing wire-making processes cannot obtain RT-1400 titanium alloy wire that meets the quality requirements of 3D printing processes.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: a method for preparing RT-1400 high-strength titanium alloy wire for 3D printing, characterized in that the RT-1400 high-strength titanium alloy wire for 3D printing is composed of the following components in mass percentage: Al 4.2%~5.2%, V 2.5%~3.5%, Cr 1.1%~2.1%, Mo 5.1%~6.1%, Fe 1.0%~2.0%, with the balance being Ti and unavoidable impurity elements; the preparation method includes the following steps:

[0005] Step 1: Using sponge titanium, Al-85V master alloy, Al-Mo master alloy, aluminum briquettes and titanium dioxide as raw materials, weigh and mix each raw material evenly according to the design ratio of the target product, and then press it into an electrode.

[0006] Step 2: The electrode pressed in Step 1 is melted more than twice in a vacuum arc furnace to obtain an alloy ingot, which is then forged, rolled and peeled to obtain RT-1400 titanium alloy billet.

[0007] Step 3: Roll the RT-1400 titanium alloy bar billet obtained in Step 2 into wire rod using a wire rod rolling mill, and then use a centerless lathe to peel off the wire rod to obtain RT-1400 titanium alloy wire blank.

[0008] Step 4: After removing the outer skin and removing the defects from the RT-1400 titanium alloy wire blank obtained in Step 3, perform the first stage of multi-pass hot drawing to obtain the first drawn RT-1400 titanium alloy wire.

[0009] Step 5: Perform a second stage of multi-pass hot drawing on the RT-1400 titanium alloy first drawn wire obtained in Step 4 to obtain the RT-1400 titanium alloy second drawn wire.

[0010] Step 6: Perform a third-stage multi-pass hot drawing on the RT-1400 titanium alloy second drawing wire obtained in Step 5 to obtain the RT-1400 titanium alloy third drawing wire.

[0011] Step 7: Peel the RT-1400 titanium alloy third drawing wire obtained in Step 6, clean the surface and wind it into a coil to obtain RT-1400 high-strength titanium alloy wire.

[0012] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the impurity elements in step one are O, C, N and H, and the mass percentages of each impurity element are: C≤0.08%, N≤0.05%, H≤0.015%, and O≤0.15%.

[0013] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the diameter of the wire rod in step three is Ф8.5mm~Ф9.5mm, the rolling heating temperature is 800℃~850℃, and the diameter of the RT-1400 titanium alloy wire blank is Ф7.6mm~Ф8.0mm.

[0014] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the shrinkage of each hot drawing pass in step four is 0.5 mm, and the diameter of the first drawn RT-1400 titanium alloy wire is Ф4.0 mm to Ф4.2 mm.

[0015] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the shrinkage of each hot drawing pass in step five is 0.3 mm, and the diameter of the second drawing wire of the RT-1400 titanium alloy is Ф2.0 mm to Ф2.2 mm.

[0016] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the shrinkage of each hot drawing pass in step six is ​​0.1 mm, and the diameter of the third drawing wire of the RT-1400 titanium alloy is Ф1.3 mm to Ф1.4 mm.

[0017] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that, in step seven, the RT-1400 titanium alloy third drawing wire is stripped to a diameter of Ф1.2mm; the tensile strength of the RT-1400 high-strength titanium alloy wire is 1400MPa~1600MPa.

[0018] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the first multi-pass hot drawing in step four, the second multi-pass hot drawing in step five, and the third multi-pass hot drawing in step six are all carried out by argon-filled hot drawing, and the temperature of argon-filled hot drawing is 780℃~820℃.

[0019] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the first multi-pass hot drawing in step four, the second multi-pass hot drawing in step five, and the third multi-pass hot drawing in step six all adopt the roller die drawing method.

[0020] The above-mentioned RT-1400 high-strength titanium alloy wire for 3D printing and its preparation method are characterized in that the first multi-pass hot drawing in step four, the second multi-pass hot drawing in step five, and the third multi-pass hot drawing in step six all adopt a segmented method of drawing reduction.

[0021] This invention controls the process parameters and wire diameter of each stage of multi-pass hot drawing, ensuring that the wire will not break while maintaining production efficiency. Furthermore, the diameter of the RT-1400 high-strength titanium alloy wire is the conventional optimal choice for wires used in the 3D printing industry.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This invention sequentially employs vacuum consumable arc melting, forging, rolling, and peeling to obtain RT-1400 titanium alloy billets. Then, through rolling and peeling, peeling and damage removal, three hot drawing processes, peeling, and cleaning, RT-1400 high-strength titanium alloy wire is obtained. By employing three hot drawing processes and controlling the deformation amount and drawing temperature parameters of each pass, the strength and plasticity matching of the wire product is improved. Combined with the use of a multi-pass roller drawing method, the synchronization and uniformity of the metal flow on the wire surface and in the core are controlled, effectively preventing defects such as tail shrinkage, porosity, and delamination, ensuring the quality of the RT-1400 high-strength titanium alloy wire and meeting the quality requirements of the 3D printing process.

[0024] 2. This invention limits the composition of RT-1400 high-strength titanium alloy wire for 3D printing to ensure that there are no elements that are easy to segregate, reduces the number of vacuum consumable arc melting processes, simplifies the process flow, and is easy to industrialize.

[0025] 3. The RT-1400 high-strength titanium alloy wire prepared by this invention has good surface quality, meets the requirements of various wire feeding 3D printing processes and equipment, and effectively improves the quality of printed parts.

[0026] 4. The RT-1400 high-strength titanium alloy wire prepared by this invention is a straight wire or coiled wire with a diameter of 1.2 mm. This specification is the most commonly used wire specification in the field of 3D printing technology and has a wide range of applications, which improves the practical value of the preparation method of this invention.

[0027] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0028] Example 1

[0029] The RT-1400 high-strength titanium alloy wire for 3D printing in this embodiment is composed of the following components by mass percentage: Al 4.9%, V 3.0%, Cr 1.5%, Mo 5.5%, Fe 2.0%, with the balance being Ti and unavoidable impurity elements. The mass percentages of the impurity elements O, C, N, and H are: C 0.06%, N 0.05%, H 0.015%, and O 0.15%, respectively. The preparation method includes the following steps:

[0030] Step 1: Using sponge titanium, Al-85V master alloy, Al-Mo master alloy, aluminum briquettes and titanium dioxide as raw materials, weigh and mix each raw material evenly according to the design ratio of the target product, and then press it into an electrode.

[0031] Step 2: The electrode pressed in Step 1 is melted more than twice in a vacuum arc furnace to obtain an alloy ingot, which is then forged, rolled and peeled to obtain RT-1400 titanium alloy billet.

[0032] Step 3: Roll the RT-1400 titanium alloy bar billet obtained in Step 2 into a wire rod with a diameter of Ф8.5mm~Ф9.5mm using a wire rod rolling mill. The rolling heating temperature is 800℃~850℃. Then, use a centerless lathe to peel off the wire rod to obtain RT-1400 titanium alloy wire blanks with a diameter of Ф7.6mm~Ф8.0mm.

[0033] Step 4: After removing the outer skin and removing the defects from the RT-1400 titanium alloy wire blank obtained in Step 3, the first stage of multi-pass argon-filled hot drawing is carried out using a roller die drawing method. The temperature of the first stage of multi-pass argon-filled hot drawing is 780℃, and the shrinkage of each argon-filled hot drawing is 0.5mm, to obtain the first drawn RT-1400 titanium alloy wire with a diameter of Ф4.0mm~Ф4.2mm.

[0034] Step 5: The RT-1400 titanium alloy first drawn wire obtained in Step 4 is subjected to a second stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the second stage of multi-pass argon-filled hot drawing is 800℃, and the reduction in diameter of each argon-filled hot drawing is 0.3mm, resulting in an RT-1400 titanium alloy second drawn wire with a diameter of Ф2.0mm~Ф2.2mm.

[0035] Step 6: The RT-1400 titanium alloy second drawn wire obtained in Step 5 is subjected to a third stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the third stage of multi-pass argon-filled hot drawing is 800℃, and the reduction of each argon-filled hot drawing is 0.1mm, resulting in RT-1400 titanium alloy third drawn wire with a diameter of Ф1.3mm~Ф1.4mm.

[0036] Step 7: Peel the RT-1400 titanium alloy third drawing wire obtained in Step 6 to a diameter of Ф1.2mm, clean the surface and wind it into a coil to obtain a 3D printing RT-1400 high-strength titanium alloy wire with a tensile strength of 1453MPa; the 3D printing RT-1400 high-strength titanium alloy wire is a coiled wire with a diameter of 1.2mm.

[0037] Example 2

[0038] The RT-1400 high-strength titanium alloy wire for 3D printing in this embodiment is composed of the following components by mass percentage: Al 4.2%, V 2.5%, Cr 1.1%, Mo 5.1%, Fe 1.0%, with the balance being Ti and unavoidable impurity elements. The mass percentages of the impurity elements O, C, N, and H are: C 0.06%, N 0.05%, H 0.012%, and O 0.15%, respectively. The preparation method includes the following steps:

[0039] Step 1: Using sponge titanium, Al-85V master alloy, Al-Mo master alloy, aluminum briquettes and titanium dioxide as raw materials, weigh and mix each raw material evenly according to the design ratio of the target product, and then press it into an electrode.

[0040] Step 2: The electrode pressed in Step 1 is melted more than twice in a vacuum arc furnace to obtain an alloy ingot, which is then forged, rolled and peeled to obtain RT-1400 titanium alloy billet.

[0041] Step 3: Roll the RT-1400 titanium alloy bar billet obtained in Step 2 into a wire rod with a diameter of Ф8.5mm~Ф9.5mm using a wire rod rolling mill. The rolling heating temperature is 800℃~850℃. Then, use a centerless lathe to peel off the wire rod to obtain RT-1400 titanium alloy wire blanks with a diameter of Ф7.6mm~Ф8.0mm.

[0042] Step 4: After removing the outer skin and removing the defects from the RT-1400 titanium alloy wire blank obtained in Step 3, the first stage of multi-pass argon-filled hot drawing is carried out using a roller die drawing method. The temperature of the first stage of multi-pass argon-filled hot drawing is 800℃, and the shrinkage of each argon-filled hot drawing is 0.5mm, to obtain the first drawn RT-1400 titanium alloy wire with a diameter of Ф4.0mm~Ф4.2mm.

[0043] Step 5: The RT-1400 titanium alloy first drawn wire obtained in Step 4 is subjected to a second stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the second stage of multi-pass argon-filled hot drawing is 800℃, and the reduction in diameter of each argon-filled hot drawing is 0.3mm, resulting in an RT-1400 titanium alloy second drawn wire with a diameter of Ф2.0mm~Ф2.2mm.

[0044] Step 6: The RT-1400 titanium alloy second drawn wire obtained in Step 5 is subjected to a third stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the third stage of multi-pass argon-filled hot drawing is 800℃, and the reduction of each argon-filled hot drawing is 0.1mm, resulting in RT-1400 titanium alloy third drawn wire with a diameter of Ф1.3mm~Ф1.4mm.

[0045] Step 7: Peel the RT-1400 titanium alloy third drawing wire obtained in Step 6 to a diameter of Ф1.2mm, clean the surface and wind it into a coil to obtain a 3D printing RT-1400 high-strength titanium alloy wire with a tensile strength of 1613MPa; the 3D printing RT-1400 high-strength titanium alloy wire is a coiled wire with a diameter of 1.2mm.

[0046] Example 3

[0047] The RT-1400 high-strength titanium alloy wire for 3D printing in this embodiment is composed of the following components by mass percentage: Al 5.2%, V 3.5%, Cr 2.1%, Mo 5.5%, Fe 1.8%, with the balance being Ti and unavoidable impurity elements. The mass percentages of the impurity elements O, C, N, and H are: C 0.08%, N 0.03%, H 0.012%, and O 0.15%, respectively. The preparation method includes the following steps:

[0048] Step 1: Using sponge titanium, Al-85V master alloy, Al-Mo master alloy, aluminum briquettes and titanium dioxide as raw materials, weigh and mix each raw material evenly according to the design ratio of the target product, and then press it into an electrode.

[0049] Step 2: The electrode pressed in Step 1 is melted more than twice in a vacuum arc furnace to obtain an alloy ingot, which is then forged, rolled and peeled to obtain RT-1400 titanium alloy billet.

[0050] Step 3: Roll the RT-1400 titanium alloy bar billet obtained in Step 2 into a wire rod with a diameter of Ф8.5mm~Ф9.5mm using a wire rod rolling mill. The rolling heating temperature is 800℃~850℃. Then, use a centerless lathe to peel off the wire rod to obtain RT-1400 titanium alloy wire blanks with a diameter of Ф7.6mm~Ф8.0mm.

[0051] Step 4: After removing the outer skin and removing the defects from the RT-1400 titanium alloy wire blank obtained in Step 3, the first stage of multi-pass argon-filled hot drawing is carried out using a roller die drawing method. The temperature of the first stage of multi-pass argon-filled hot drawing is 820℃, and the shrinkage of each argon-filled hot drawing is 0.5mm, to obtain the first drawn RT-1400 titanium alloy wire with a diameter of Ф4.0mm~Ф4.2mm.

[0052] Step 5: The RT-1400 titanium alloy first drawn wire obtained in Step 4 is subjected to a second stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the second stage of multi-pass argon-filled hot drawing is 820℃, and the reduction of each argon-filled hot drawing is 0.3mm, to obtain the RT-1400 titanium alloy second drawn wire with a diameter of Ф2.0mm~Ф2.2mm.

[0053] Step 6: The RT-1400 titanium alloy second drawn wire obtained in Step 5 is subjected to a third stage of multi-pass argon-filled hot drawing using a roller die drawing method. The temperature of the third stage of multi-pass argon-filled hot drawing is 820℃, and the reduction of each argon-filled hot drawing is 0.1mm, resulting in RT-1400 titanium alloy third drawn wire with a diameter of Ф1.3mm~Ф1.4mm.

[0054] Step 7: Peel the RT-1400 titanium alloy third drawing wire obtained in Step 6 to a diameter of Ф1.2mm, clean the surface and wind it into a coil to obtain a 3D printing RT-1400 high-strength titanium alloy wire with a tensile strength of 1570MPa; the 3D printing RT-1400 high-strength titanium alloy wire is a coiled wire with a diameter of 1.2mm.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing RT-1400 high-strength titanium alloy wire for 3D printing, characterized in that, The RT-1400 high-strength titanium alloy wire for 3D printing is composed of the following components by mass percentage: Al 4.2%~5.2%, V 2.5%~3.5%, Cr 1.1%~2.1%, Mo 5.1%~6.1%, Fe 1.0%~2.0%, with the balance being Ti and unavoidable impurity elements; the preparation method includes the following steps: Step 1: Using sponge titanium, Al-85V master alloy, Al-Mo master alloy, aluminum briquettes and titanium dioxide as raw materials, weigh and mix each raw material evenly according to the design ratio of the target product, and then press it into an electrode. Step 2: The electrode pressed in Step 1 is melted more than twice in a vacuum arc furnace to obtain an alloy ingot, which is then forged, rolled and peeled to obtain RT-1400 titanium alloy billet. Step 3: Roll the RT-1400 titanium alloy bar billet obtained in Step 2 into wire rod using a wire rod rolling mill, and then use a centerless lathe to peel off the wire rod to obtain RT-1400 titanium alloy wire blank. Step 4: After removing the outer skin and removing the defects from the RT-1400 titanium alloy wire blank obtained in Step 3, perform the first stage of multi-pass hot drawing to obtain the first drawn RT-1400 titanium alloy wire; the shrinkage of each hot drawing pass is 0.5mm, and the diameter of the first drawn RT-1400 titanium alloy wire is Ф4.0mm~Ф4.2mm; Step 5: Perform a second stage of multi-pass hot drawing on the RT-1400 titanium alloy first drawn wire obtained in Step 4 to obtain the RT-1400 titanium alloy second drawn wire; the reduction in each hot drawing pass is 0.3mm, and the diameter of the RT-1400 titanium alloy second drawn wire is Ф2.0mm~Ф2.2mm. Step 6: Perform a third-stage multi-pass hot drawing on the RT-1400 titanium alloy second drawing wire obtained in Step 5 to obtain the RT-1400 titanium alloy third drawing wire; the reduction in each hot drawing pass is 0.1 mm, and the diameter of the RT-1400 titanium alloy third drawing wire is Ф1.3 mm to Ф1.4 mm. In step four, the first multi-pass hot drawing, in step five, the second multi-pass hot drawing, and in step six, the third multi-pass hot drawing all adopt argon-filled hot drawing, and the temperature of argon-filled hot drawing is 780℃~820℃. In step four, the first multi-pass hot drawing, in step five, the second multi-pass hot drawing, and in step six, the third multi-pass hot drawing all employ roller die drawing. Step 7: Peel the RT-1400 titanium alloy third drawing wire obtained in Step 6, clean the surface and wind it into a coil to obtain RT-1400 high-strength titanium alloy wire.

2. The method for preparing RT-1400 high-strength titanium alloy wire for 3D printing according to claim 1, characterized in that, The impurity elements mentioned in step one are O, C, N and H, and the mass percentages of each impurity element are: C≤0.08%, N≤0.05%, H≤0.015%, and O≤0.15%.

3. The method for preparing RT-1400 high-strength titanium alloy wire for 3D printing according to claim 1, characterized in that, In step three, the diameter of the wire rod is Ф8.5mm~Ф9.5mm, the rolling heating temperature is 800℃~850℃, and the diameter of the RT-1400 titanium alloy wire blank is Ф7.6mm~Ф8.0mm.

4. The method for preparing RT-1400 high-strength titanium alloy wire for 3D printing according to claim 1, characterized in that, In step seven, the RT-1400 titanium alloy third drawing wire is stripped to a diameter of Ф1.2mm; the tensile strength of the RT-1400 high-strength titanium alloy wire is 1400MPa~1600MPa.

5. The method for preparing RT-1400 high-strength titanium alloy wire for 3D printing according to claim 1, characterized in that, In step four, the first multi-pass hot drawing, in step five, the second multi-pass hot drawing, and in step six, the third multi-pass hot drawing all adopt a segmented method of drawing reduction.