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Preparation method of Ti2AlNb-based alloy large-size uniform fine-grain bar

A large-scale, base alloy technology, which is applied in the field of preparation of large-scale uniform fine-grained rods of Ti2AlNb-based alloys, can solve the problems of high deformation resistance of ingots, poor structure uniformity, and insufficient process plasticity, etc. Ability improvement, forging crack prevention effect

Active Publication Date: 2016-04-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the invention is to: provide a kind of Ti 2 Preparation method of AlNb-based alloy large-scale uniform fine-grained rods in order to overcome Ti 2 AlNb-based alloy ingots have high deformation resistance, insufficient process plasticity, poor microstructure uniformity after forging, easy cracking and low yield in forging

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  • Preparation method of Ti2AlNb-based alloy large-size uniform fine-grain bar
  • Preparation method of Ti2AlNb-based alloy large-size uniform fine-grain bar
  • Preparation method of Ti2AlNb-based alloy large-size uniform fine-grain bar

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preparation example Construction

[0018] The present invention will be described in further detail below. A kind of Ti 2 A method for preparing a large-scale uniform fine-grained bar of an AlNb-based alloy. The large-scale bar refers to a bar with a diameter of 150 mm to 500 mm. It is characterized in that the preparation steps are as follows:

[0019] 1. Composition homogenization treatment: Ti 2 AlNb-based alloy ingots are placed in a heating furnace for component homogenization treatment, the heating temperature is 1150 ° C ~ 1250 ° C, the holding time is 10 h ~ 30 h, furnace cooling or air cooling; the surface of the ingot before entering the furnace is coated with 0.1 mm ~ 3 mm thick High temperature resistant and anti-oxidation coating;

[0020] 2. Blank opening forging: Carry out 3 to 5 times of soft sheath blank opening upsetting and drawing forging on the billet obtained in step 1. The initial forging temperature of the billet is 1050°C to 1200°C. The amount of upsetting and drawing deformation is ...

Embodiment 1

[0031] This embodiment takes the Φ200mm bar as the target, and includes the following steps:

[0032] 1. The ingot is subjected to component homogenization heat treatment at 1180°C for 10 hours, and the ingot is coated with a 0.5mm thick type TB5-2 high temperature resistant and anti-oxidation coating before entering the furnace;

[0033]2. The billet obtained in step 1 is subjected to soft sheath blank forging for three times at the initial forging temperature range of 1050°C to 1150°C; the forging temperature for the first fire is 1150°C, and the forging temperature is lowered by 50°C for each subsequent fire; After the forging billet comes out of the furnace, quickly wrap the insulation cotton with a thickness of 20mm and then forge; complete one upsetting and one pulling out for each fire, and the deformation of upsetting and pulling is 40%; the final forging temperature is not lower than 800 ° C, and it is naturally cooled after each fire forging;

[0034] 3. Carry out so...

Embodiment 2

[0041] This embodiment takes the Φ300mm bar as the target, and includes the following steps:

[0042] 1. The ingot is subjected to a composition homogenization heat treatment at 1200°C for 15 hours, and the ingot is coated with a 1mm thick type of TB1260-16 high temperature resistant and anti-oxidation coating before entering the furnace;

[0043] 2. The billet obtained in step 1 is subjected to soft sheath blank forging for three times at the initial forging temperature range of 1120°C to 1180°C; the forging temperature for the first fire is 1180°C, and the forging temperature is lowered by 30°C for each subsequent fire; After the forging billet comes out of the furnace, it is quickly wrapped with insulation cotton with a thickness of 25mm and then forged; one upsetting and one drawing are completed for each fire, and the deformation of upsetting and drawing is 35%; the final forging temperature is not lower than 800°C, and it is naturally cooled after each fire forging;

[0...

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Abstract

The invention belongs to the technical field of Ti-Al intermetallic compound material processing and relates to a preparation method of a Ti2AlNb-based alloy large-size uniform fine-grain bar. The method is characterized by comprising the following steps: performing homogenization treatment on the components; performing cogging and forging; forging below the beta transformation temperature; testing the beta transformation temperature T(beta) of the forging stock; forging above the beta transformation temperature; forging below the beta transformation temperature; and rolling for shaping. The invention provides a preparation method of a Ti2AlNb-based alloy large-size uniform fine-grain bar, and the problems of a Ti2AlNb-based alloy ingot including high deformation resistance, insufficient processing plasticity, low structure uniformity after forging, easy cracking in forging and low yield are overcome.

Description

technical field [0001] The invention belongs to the technical field of processing Ti-Al intermetallic compound materials, and relates to a Ti 2 The invention discloses a preparation method of a large-scale uniform fine-grained rod of an AlNb-based alloy. Background technique [0002] Ti 2 AlNb-based alloys belong to Ti-Al intermetallic compound materials, which combine Ti 3 The performance advantages of Al and TiAl have good room temperature plasticity and toughness, high specific strength, good creep resistance and oxidation resistance, and good high-temperature forming ability. High-temperature structural materials are expected to replace traditional nickel-based superalloys as important materials for aerospace engine hot-end parts, hypersonic vehicle tail rudders and thermal protection structures. important role. The manufacture of large-sized structural forgings in the aviation and aerospace fields, such as engine casings, disc-shaped parts, etc., requires large-size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 周毅曹京霞黄旭王宝
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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