A Forming Method Combining Free Forging and Pulse Current Assisted Extrusion to Improve Microstructure Uniformity of Titanium Alloy Bars

A technology of pulsed current and uniform structure, applied in metal processing equipment and other directions, can solve the problems of inability to meet aerospace, poor microscopic uniformity, and reduced mechanical properties, and can compensate for uneven temperature field distribution, large temperature window, and mechanical performance indicators. improved effect

Active Publication Date: 2022-02-11
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

The main reason is that the micro-uniformity of grain size, phase volume fraction and texture of titanium alloy billets prepared by traditional forging, rolling or extrusion methods is poor (such as figure 1 As shown in Vacuum, 2019, 160:81-88), the mechanical properties are seriously reduced, making the quality not up to standard and unable to meet aerospace standards
This problem has become a major bottleneck restricting the quality improvement of domestic titanium alloy fasteners. How to solve this technical problem poses a severe challenge to domestic research institutions and manufacturing enterprises.

Method used

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  • A Forming Method Combining Free Forging and Pulse Current Assisted Extrusion to Improve Microstructure Uniformity of Titanium Alloy Bars
  • A Forming Method Combining Free Forging and Pulse Current Assisted Extrusion to Improve Microstructure Uniformity of Titanium Alloy Bars
  • A Forming Method Combining Free Forging and Pulse Current Assisted Extrusion to Improve Microstructure Uniformity of Titanium Alloy Bars

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Embodiment 1

[0041] Embodiment 1: Ti6554 rod preparation

[0042] The chemical composition of Ti6554 titanium alloy is (%, mass fraction): chromium 5.7, molybdenum 4.7, vanadium 4.8, aluminum 3.9, iron 0.08, silicon 0.028, carbon 0.025, and the rest of titanium. Phase transition temperature T of Ti6554 β =820°C, which belongs to the high-strength and tough near-β titanium alloy with high content of alloying elements, so a 70kg ingot (diameter 170mm×length 200mm) was obtained by smelting three times in a vacuum consumable electric arc furnace. The specific smelting parameters are shown in Table 1.

[0043] Heat the 70kg ingot to 1150°C for 2 hours, quickly move it to a 3-ton hammer forging machine, perform A and B upsetting and drawing deformation treatments to complete the free forging billet opening process, and obtain a forged bar with a diameter of 100mm. Perform A and B extrusion deformation treatments to complete the pulse current assisted extrusion process of forged bars (see Table ...

Embodiment 2

[0044] Embodiment 2: Ti55531 rod preparation

[0045] The chemical composition of the Ti55531 titanium alloy is (%, mass fraction): aluminum 5.3, molybdenum 5.2, vanadium 5.2, chromium 2.65, zirconium 1.02, and the rest of titanium. Phase transition temperature T of Ti55531 β =850°C, which belongs to high-strength and tough near-β titanium alloy with high content of alloying elements, so a 70kg ingot (diameter 170mm×length 200mm) was obtained by smelting three times in a vacuum consumable electric arc furnace. The melting parameters are shown in Table 1.

[0046] Heat the 70kg ingot to 1100°C for 2 hours, quickly move it to a 3-ton hammer forging machine, implement A and B upsetting and drawing to complete the free forging billet opening process, and obtain a forged bar with a diameter of 100mm. Extrusion A and B were performed to complete the pulse current assisted extrusion process for the forged bar (see Table 3 for specific process parameters), and a bar with a diameter o...

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Abstract

The invention relates to a forming method that combines free forging and pulse current assisted extrusion to improve the microstructure uniformity of titanium alloy rods, including heating titanium alloy ingots to T1 temperature for A upsetting deformation treatment, A upsetting deformation treatment After the end, the titanium alloy ingot is air-cooled to room temperature, and then the titanium alloy ingot is heated to T3 temperature for B upsetting and drawing deformation treatment. After the B upsetting and drawing deformation treatment, the titanium alloy forging rod is obtained and the titanium alloy forging rod is quickly blown and cooled. To room temperature, the obtained titanium alloy forging rods are sequentially subjected to A extrusion deformation treatment, B extrusion deformation treatment and C extrusion deformation treatment on the pulse current assisted extrusion equipment, and C extrusion deformation treatment is air-cooled to room temperature to obtain titanium alloy. Alloy bars. By combining free forging and pulse current assisted extrusion compounding, a homogeneous and high-strength titanium alloy bar is prepared, and the microstructure uniform distribution and mechanical properties of the bar are improved to meet the performance requirements of aerospace fasteners.

Description

technical field [0001] The invention relates to the field of preparation of titanium alloy materials, in particular to a forming method for improving the microstructure uniformity of titanium alloy rods by combining free forging and pulse current assisted extrusion. Background technique [0002] As high-end parts, titanium alloy fasteners play an irreplaceable role in the thermal control systems and structural systems of aircraft, satellites, rockets and other aircraft. At present, my country's titanium alloy fastener billets mainly rely on imports. The main reason is that the micro-uniformity of grain size, phase volume fraction and texture of titanium alloy billets prepared by traditional forging, rolling or extrusion methods is poor (such as figure 1 As shown, Vacuum, 2019, 160:81-88), the mechanical properties are seriously reduced, so that the quality is not up to standard, and it cannot meet the aerospace standards. This problem has become a major bottleneck restrict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/00B21J5/00C22C14/00
CPCC22F3/00B21J5/002C22C14/00
Inventor 武川
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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