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Forging method for high temperature resistance titanium alloy large-size bars used for engines

A titanium alloy, high-temperature-resistant technology, applied in the direction of manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve problems such as material cracking, small deformation, and significant difference in thermal conductivity between the center and edge of the bar. , to achieve the effect of avoiding cracks and uneven deformation

Active Publication Date: 2017-05-31
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For large-scale WSTi64311SC titanium alloy rods exceeding Φ200mm, the phase transition temperature is as high as 1050°C, and the width of the α+β phase region is only 70°C, while the two-phase region of ordinary two-phase titanium alloy is about 200°C. The difference in thermal conductivity is significant. In addition, the content of alloy elements is as high as 17%, the deformation resistance of the two-phase region increases sharply, the forgeability of the deformation center is poor, and the deformation rate is high, which is easy to cause material cracking. The crack has strong extensibility and is not easy to be polished. Especially at sharp edges and corners, if the temperature is slightly lowered, large cracks will be generated, resulting in the inability of forging, and it is difficult to achieve a good microstructure refinement effect with small deformation or high heating temperature

Method used

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  • Forging method for high temperature resistance titanium alloy large-size bars used for engines
  • Forging method for high temperature resistance titanium alloy large-size bars used for engines
  • Forging method for high temperature resistance titanium alloy large-size bars used for engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1, blank forging:

[0041] The billet opening of the ingot is completed by three-fire forging. The heating temperature of the first fire forging is 1150°C. After heating for 10 hours, it is out of the furnace. The ingot is elongated and deformed once. The billet opening temperature of the second fire and the third fire is 1090°C and 1070°C, each fire is heated and kept for 8 hours, after being out of the furnace, it is upsetting and drawing, and after drawing, it is processed in all directions. The upsetting and drawing ratio of each fire is 2.2, Water quenching is used after forging.

[0042] Step 2, Intermediate Forging:

[0043] The ingot after the billet forging in step 1 is isothermally re-forged seven times in the two-phase zone, and the heating temperature for each fire is selected to be 50°C (1000°C) below the phase transition point to prevent the forging temperature from exceeding the thermal processing window. All the fires are wrapped with 50mm thick a...

Embodiment 2

[0047] Step 1, blank forging:

[0048]The ingot opening is completed by three-fire forging. The heating temperature of the first fire forging is 1200°C. After heating for 8 hours, it is out of the furnace. The ingot is elongated and deformed. , to avoid deformation dead zone at the edges and corners, the forging ratio is 1.6. The billet opening temperature of the second fire and the third fire is 1100°C and 1080°C, each fire is heated for 6 hours, and the upsetting and drawing are completed after being out of the furnace. During the period, water quenching is used after forging.

[0049] Step 2, Intermediate Forging:

[0050] The ingot after step 1 billet forging is subjected to isothermal reforging in the two-phase area, and the heating temperature for each firing is selected to be 70°C (980°C) below the phase transition point to avoid the forging temperature exceeding the thermal processing window. All are wrapped with asbestos with a thickness of 20mm. After the material...

Embodiment 3

[0054] Step 1, blank forging:

[0055] The ingot opening is completed by three-fire forging. The heating temperature of the first fire forging is 1250°C. After heating for 9 hours, it is out of the furnace. The ingot is elongated and deformed once. The billet opening temperature of the second fire and the third fire is 1110°C and 1090°C. Each heat is heated and kept for 7 hours. After being out of the furnace, it is upsetting and stretched. Water quenching is used after forging.

[0056] Step 2, Intermediate Forging:

[0057] The ingot after blank forging in step 1 is isothermally re-forged seven times in the two-phase zone, and the heating temperature for each fire is selected to be 60°C (990°C) below the phase transition point to prevent the forging temperature from exceeding the thermal processing window. All the fires are wrapped with 30mm thick asbestos. After the materials are out of the furnace, they are subjected to upsetting, elongation and inversion in sequence. Th...

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Abstract

The invention discloses a forging method for high temperature resistance titanium alloy large-size bars used for engines. The method comprises following steps: firstly, performing three-heating cogging and forging on ingot casting then performing multi-heating isothermal reforging on the forging stock at two-phase region; Finally, heating at 60 DEG C to 80 DEG C under phase transition point, , to obtain WSTi64311SC titanium alloy bars. According to the method of the invention, octagonal forging is carried out on the forging process of each heating of WSTi64311SC titanium alloy bars so as to avoid non-uniform deformation or dead zones; blank material is wrapped by asbestos so as to avoid cracks due to temperature reduction in the blank material. Besides, three-heating cogging is carried out above the phase transition point so as to guarantee uniform organization of the blank materials; the large size WSTi64311SC titanium alloy bars having uniform and blurred macrostructure and equiaxial and fine microstructure are obtained.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a forging method for high-temperature-resistant titanium alloy large-scale rods for engines. Background technique [0002] WSTi64311SC high-temperature titanium alloy is a 600°C high-temperature titanium alloy that can be used to process key components such as aeroengine blades, disks, and centrifugal impellers. It can meet the needs of turbofan and turboshaft engines with high thrust-to-weight ratio and low energy consumption in my country. The service temperature of this alloy has reached the limit of long-term stable use of titanium alloys, and the comprehensive mechanical properties match, and can be processed into thin-walled, large-diameter or dual-performance parts, replacing GH4169 high-temperature alloys, which can reduce weight by more than 40%, greatly reducing The weight of the engine is the key material to break through the bottleneck of domestic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21K29/00
CPCB21J5/00B21K29/00
Inventor 孙峰罗文忠张晓园雷锦文孙小平赵小花张小航王凯旋刘向宏
Owner 西部超导材料科技股份有限公司
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