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A preparation method for forging forming of a near-β-type titanium alloy forging with high strength and high toughness

A high-strength, high-toughness, titanium alloy technology, applied in metal processing equipment and other directions, can solve the problems of near-β-type titanium alloy forgings that are difficult to match in strength and plasticity, difficult to obtain homogeneous fine ternary structure, and low fracture toughness and fatigue resistance. , to achieve the effects of stable and controllable quality, promotion of tissue uniformity, and high strength and plasticity matching.

Active Publication Date: 2021-11-30
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional preparation method for forming near-β-type titanium alloy forgings is to open the billet above the phase transition temperature, repeatedly upsetting and drawing the billet in the two-phase area for multiple fires, and finally forging below the phase transition temperature. However, this process usually cannot effectively suppress the initial The influence of tissue genetics on the morphology of secondary α phase, and its poor process stability, it is difficult to obtain a homogeneous fine ternary structure, resulting in the difficulty of matching the strong plasticity of near β-type titanium alloy forgings, and the fracture toughness and fatigue resistance are relatively low. Low

Method used

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  • A preparation method for forging forming of a near-β-type titanium alloy forging with high strength and high toughness
  • A preparation method for forging forming of a near-β-type titanium alloy forging with high strength and high toughness
  • A preparation method for forging forming of a near-β-type titanium alloy forging with high strength and high toughness

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1) The Ti-55531 near-β-type titanium alloy ingot of Φ220 specification is used, and the phase transition temperature of the ingot is 845°C. Use a resistance furnace to heat the ingot to 1100°C above the β-phase transition temperature, keep it warm for 8 hours, then use a 3,500-ton fast forging machine to repeatedly upset and elongate in the β-phase region for 3 times, and the final forging temperature is not lower than 850°C. The total forging ratio is controlled at 2.5. After forging, it is cooled to room temperature in the air and subjected to surface grinding treatment to obtain a forged billet with a cross-sectional diameter of 200-220 mm.

[0034] 2) Using a resistance furnace, heat the forging billet obtained in step 1) to 855°C, keep it warm for 2 hours, and carry out radial forging on a 600-ton precision forging machine. 20mm / s, the total forging time is 15 minutes, the total forging ratio is 6, and the final forging temperature is not less than 815°C.

[0035]...

Embodiment 2

[0043] 1) The Ti-7333 near-β-type titanium alloy ingot of Φ220 specification is used, and the phase transition temperature of the ingot is 855°C. Use a resistance furnace to heat the ingot to 1150°C above the β-phase transition temperature, keep it warm for 8 hours, then use a 3,500-ton fast forging machine to repeatedly upset and elongate in the β-phase area for 3 times, and the final forging temperature is not lower than 860°C. The total forging ratio is controlled at 2.5. After forging, it is cooled to room temperature in the air and subjected to surface grinding treatment to obtain a forged billet with a cross-sectional diameter of 220-250 mm.

[0044] 2) Using a resistance furnace, heat the forging billet obtained in step 1) to 865°C, keep it warm for 2 hours, and carry out radial forging on a 600-ton precision forging machine. 20mm / s, the total forging time is 15 minutes, the total forging ratio is 6, and the final forging temperature is not less than 825°C.

[0045] 3)...

Embodiment 3

[0053] 1) The Ti-1023 near-β-type titanium alloy ingot of Φ260 specification is used, and the phase transition temperature of the ingot is 805°C. Use a resistance furnace to heat the ingot to 1050°C above the β-phase transition temperature, keep it warm for 10 hours, and then use a 3,500-ton fast forging machine to repeatedly upset and elongate in the β-phase area for 3 times, and the final forging temperature is not lower than 805°C. The total forging ratio is controlled at 4.5. After forging, it is cooled to room temperature in the air and subjected to surface grinding treatment to obtain a forged billet with a cross-sectional diameter of 240-270mm.

[0054] 2) Using a resistance furnace, heat the forging billet obtained in step 1) to 815°C, keep it warm for 2 hours, and carry out radial forging on a 600-ton precision forging machine. 25mm / s, the total forging time is 12 minutes, the total forging ratio is 8, and the final forging temperature is not less than 785°C.

[0055...

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Abstract

The invention discloses a preparation method for forging and forming of a nearly β-type titanium alloy forging with high strength and high toughness, including: 1. blank forging in β phase zone; 2. quasi-β forging, upsetting and drawing thermal deformation; 1. Repeated upsetting and drawing thermal deformation near β forging; 5. Water cooling quenching for final forging; 6. Solution aging treatment. The near-beta titanium alloy forging produced by the invention has good mechanical properties, high strong-plastic matching, stable and controllable quality, and can meet the urgent demand for high-performance near-beta titanium alloy forgings in the manufacture of aerospace titanium alloy load-bearing components.

Description

technical field [0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to a preparation method for forging and forming of a near-beta titanium alloy forging with high strength and high toughness. Background technique [0002] Near β-type high-strength and high-toughness titanium alloy, which has the characteristics of both α+β-type titanium alloy and β-type titanium alloy, has high strength, good toughness, fatigue resistance, good strength and toughness matching, and does not produce Obvious composition segregation, good hardenability and wide range of thermal processing technology, especially suitable for aerospace parts such as fuselage frame, landing gear, wing and pylon connection device that bear huge stress. [0003] The microstructure characteristics of titanium alloy forgings are closely related to the comprehensive mechanical properties of forgings. Near β-type titanium alloys, the main strengthening method is the dispe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J5/08C22F1/18
CPCB21J5/00B21J5/08C22F1/002C22F1/183
Inventor 陈刚张鸿名王静常旭升韩飞王卫卫
Owner HARBIN INST OF TECH AT WEIHAI
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