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Heat treatment method for TC2 titanium alloy small forgings with high impact toughness

A heat treatment method and titanium alloy technology, applied in the field of heat treatment, can solve the problems of low impact toughness of forgings, and achieve the effect of high impact performance and low implementation difficulty.

Pending Publication Date: 2022-06-03
江西景航航空锻铸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, the microstructure of the annealed TC2 titanium alloy small-size bar (diameter ≤ 100mm) has a very low strip-like α content (mostly ≤ 10%), and the microstructure of the forging produced by the conventional process using the small-size bar The strip α content in the structure is also very low (mostly ≤10%), which leads to low impact toughness of TC2 titanium alloy small forgings

Method used

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  • Heat treatment method for TC2 titanium alloy small forgings with high impact toughness
  • Heat treatment method for TC2 titanium alloy small forgings with high impact toughness
  • Heat treatment method for TC2 titanium alloy small forgings with high impact toughness

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Effect test

Embodiment 1

[0016] 1. Using TC2 titanium alloy Φ80mm round bar, the phase transition temperature was measured as Tβ=976±3℃; two samples with Φ80×50mm specification were forged in the conventional way: the samples were first heated in a resistance furnace , the accuracy of the resistance furnace is ±10 °C; the heating temperature is set to 936 °C, the furnace starts timing after reaching the set temperature, and the holding time is set to 80 minutes; after the holding time is reached, the billet is released from the furnace for forging, and the billet is placed on a 750kg free forging hammer. Drawn to 50×50×100mm, air-cooled to room temperature after forging, and the formed forgings are numbered Test No. 1 and Test No. 2.

[0017] 2. The test No. 1 forging was heat treated according to ordinary annealing: the sample was heated in a resistance furnace, and the resistance furnace accuracy was ±10 °C; the heating temperature was set to 780 °C, and the time was started after the furnace reached...

Embodiment 2

[0025] 1. For a TC2 titanium alloy small die forging, the effective thickness of the workpiece is 20mm.

[0026] 2. The 1st, 2nd, and 3rd heats are heat treated by ordinary annealing: the sample is heated in a resistance furnace, and the resistance furnace accuracy is ±10 °C; the heating temperature is set to 780 °C, and the time is started after the furnace reaches the set temperature. The time is set to 2h; after reaching the holding time, the billet is released and air-cooled to room temperature.

[0027] 3. The 4th, 5th and 6th heats are heat treated according to the present invention.

[0028] (1) Heat the sample in a resistance furnace with an accuracy of ±5°C; set the heating temperature to 956°C, start timing after the furnace reaches the set temperature, and set the holding time to 50 minutes; after reaching the holding time, The billet is out of the oven and air-cooled to room temperature.

[0029] (2) Heat the sample in a resistance furnace with an accuracy of ±10...

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Abstract

A heat treatment method for a TC2 titanium alloy small forge piece with high impact toughness comprises the following steps that (1) the TC2 titanium alloy small forge piece is placed in a resistance furnace to be heated, the heating temperature is set to be 20 DEG C below the beta phase transformation point, after the furnace reaches the set temperature, the heat preservation time is t minutes, and after the heat preservation time is reached, a blank is air-cooled to the room temperature; the heat preservation time is t minutes and is calculated according to the following formula: t = eta * delta max, delta max mm is the maximum section thickness of the blank, eta is the heating coefficient of the blank and is 1.0-1.2, and t is more than or equal to 50 minutes and less than or equal to 120 minutes; and (2) the forge piece treated in the step (1) is placed in a resistance furnace to be heated to 740-790 DEG C, heat preservation is conducted for 1-2 h, and then air cooling is conducted to the room temperature. The highest precision of the adopted heating furnace is + / -5 DEG C, most factories can meet conditions, and the implementation difficulty is not high; the forged piece can obtain a microscopic structure with the strip-shaped alpha phase content larger than or equal to 15%, and the high impact property is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and relates to a heat treatment method for TC2 titanium alloy small forgings with high impact toughness. Background technique [0002] TC2 titanium alloy is a near-α-type titanium alloy with medium strength and good plasticity, which contains 4% α-stabilizing element Al and 1.5% β-stabilizing element Mn. The research shows that the content of strip α phase in the microstructure of TC2 titanium alloy has a significant effect on the impact toughness of TC2 titanium alloy forgings. Increasing the content of strip α can improve the impact toughness of TC2 titanium alloy forgings. Under normal circumstances, the microstructure of annealed TC2 titanium alloy small-sized bars (diameter ≤ 100mm) has very low strip α content (mostly ≤ 10%). The strip α content in the structure is also very low (mostly ≤10%), which leads to low impact toughness of TC2 titanium alloy small forgings. Solving the pro...

Claims

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Application Information

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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 车安达张元东刘秀良杨宏伟舒勇马思琴施文鹏
Owner 江西景航航空锻铸有限公司