Forging method of Ti80 titanium alloy

A titanium alloy and forging ratio technology, which is applied in the forging field of Ti80 titanium alloy rods for marine use, can solve the problems of poor uniformity of structure, poor stability of structure and mechanical properties, etc., so as to avoid excessive growth of grains and improve mechanical properties. Stable, easy-to-operate effect

Active Publication Date: 2020-06-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the disadvantages of poor structure uniformity and poor stability of structure and mechanical properties in the prior art, the present invention proposes a forging method of Ti80 titanium alloy

Method used

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  • Forging method of Ti80 titanium alloy
  • Forging method of Ti80 titanium alloy
  • Forging method of Ti80 titanium alloy

Examples

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Effect test

Embodiment 1

[0027] Present embodiment is a kind of forging method of Ti80 titanium alloy, and its specific process is:

[0028] Step 1, the first forging above the phase transition point

[0029] Select a Ti80 titanium alloy ingot with a diameter of Φ400mm, and heat it before forging through an electric furnace. Set the heating temperature to 100°C below the phase transition point. When the furnace temperature reaches 100°C below the phase transition point, put the titanium alloy billet into the furnace, and select a heating coefficient of 0.33min / mm at a heating temperature of 100°C below the phase transition point , that is, the holding time=0.33×400=132min. Raise the temperature of the electric furnace to 110°C above the phase transition point at a rate of 20°C / s, and select a heating coefficient of 0.5min / mm at 110°C above the phase transition point, that is, holding time = 0.5×400=200min. The fast forging machine is used for upsetting and elongating forging for two fires according ...

Embodiment 2

[0039] Step 1, the first forging above the phase transition point

[0040] Select a Ti80 titanium alloy ingot with a diameter of Φ500mm, and heat it before forging through an electric furnace. Set the heating temperature to 90°C below the phase transition point. When the furnace temperature reaches 90°C below the phase transition point, put the titanium alloy billet into the furnace, and select a heating coefficient of 0.4min / mm at a heating temperature of 90°C below the phase transition point , that is, the holding time = 0.4 × 500 = 200min. Raise the temperature of the electric furnace to 90°C above the phase transition point at a rate of 20°C / s, and select a heating coefficient of 0.6min / mm at 90°C above the phase transition point, that is, the holding time=0.6×500=300min. The fast forging machine is used for upsetting and elongating forging for two fires according to the conventional method, and two upsetting and two drawing are carried out for each fire. The forging rati...

Embodiment 3

[0050] Step 1, the first forging above the phase transition point

[0051] Select a Ti80 titanium alloy ingot with a diameter of Φ600mm, and heat it before forging through an electric furnace. Set the heating temperature to 80°C below the phase transition point. When the furnace temperature reaches 80°C below the phase transition point, put the titanium alloy billet into the furnace, and select a heating coefficient of 0.45min / mm at a heating temperature of 80°C below the phase transition point. , that is, the holding time=0.45×600=270min. Raise the temperature of the electric furnace to 60°C above the phase transition point at a rate of 20°C / s, and select a heating coefficient of 0.7min / mm at 60°C above the phase transition point, that is, the holding time=0.7×600=420min. The fast forging machine is used for upsetting and elongating forging for three fires according to the conventional method, and two upsetting and two drawing are carried out for each fire. The forging ratio...

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Abstract

The invention provides a forging method of a Ti80 titanium alloy. A segmented heating method is adopted before forging in a beta single-phase zone so as to ensure that a titanium alloy billet is through heated and effectively avoid the excessive growth of grains. According to the forging method, the titanium alloy billet deforms sequentially from a temperature above a phase transition point to a temperature below the phase transition point, so that the sufficient deformation amount per heating number is ensured, and the cracking of the titanium alloy billet is prevented. The Ti80 titanium alloy bar prepared by the forging method has the uniform structure at head, middle and tail parts; the primary alpha phase is equiaxial, and the content of the primary alpha phase is 60%-80%; after the bar is annealed at the temperature of 100 DEG C under the phase transition point, the head, middle and tail parts of the bar have stable mechanical properties, the room temperature tensile strength is greater than or equal to 900MPa, the yield strength is greater than or equal to 750MPa, the elongation percentage is greater than or equal to 8%, the percentage reduction of area is greater than or equal to 15%, and the impact toughness at the temperature of minus 10 is greater than or equal to 35J/cm<2>; and the Ti80 titanium alloy bar has uniform structure and stable performances at each part, and meets the requirements of current marine applications. The forging method has the characteristics of simple operation and strong operability.

Description

technical field [0001] The invention relates to the technical field of thermal processing of titanium alloys, in particular to a forging method of Ti80 titanium alloy rods for marine use Background technique [0002] Ti80 titanium alloy is an 800MPa grade near-α-type titanium alloy developed by my country for the field of marine engineering. Its nominal chemical composition (wt.%) is Ti-6Al-3Nb-2Zr-1Mo. The alloy has good comprehensive properties such as high strength, high toughness, weldability, and corrosion resistance, and is widely used in ship structural parts, bolts, pressure-resistant shells, offshore drilling platform oil pipelines and other components. [0003] The preparation process of titanium alloy rods is usually to carry out a series of forging processes on ingots with coarse grains obtained by vacuum smelting to improve their original structure and morphology, and to obtain titanium alloy rods with fine grains, dense structure, uniform structure and stable p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/08B21J5/06B21J1/00B21J1/06B21J17/02C22F1/18
CPCB21J5/002B21J5/08B21J5/06B21J1/003B21J1/06B21J17/02C22F1/183
Inventor 徐建伟曾卫东周大地贺胜通
Owner NORTHWESTERN POLYTECHNICAL UNIV
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