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Preparation method of 650 DEG C high-temperature titanium alloy sheet for superplastic forming

A high-temperature titanium alloy and superplastic technology, which is applied in metal rolling and other directions, can solve the problems of inability to meet process performance requirements and poor superplastic forming ability, achieve uniform microstructure, weaken rolling texture, and weaken phase transformation texture effect

Active Publication Date: 2019-05-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, under the same forming parameters, the superplastic forming ability of 650°C titanium alloy sheet is worse than that of TC4 and TA15 sheets, generally below 200%, which cannot meet the process performance requirements of parts manufacturing for superplastic elongation greater than 400%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of 650℃ Titanium Alloy Sheet with Thickness of 2.0mm for Low Temperature Superplastic Forming

[0039] Step 1, smelting the 650°C titanium alloy ingot whose target composition is Ti-5.5Al-4.0Sn-3.5Zr-0.5Mo-0.4Si-0.3Nb-1.0Ta-0.7W-0.05C, and the ingot is heated at a temperature of 1100 ℃ heat preservation for 220min, carry out slab forging on the forging machine, the final forging temperature is not lower than 1000 ℃, obtain the slab for rolling, the slab size is 120mm×450mm×850mm.

[0040] Step 2, heat the slab obtained in step 1 in a heating furnace at a temperature of 1070°C for 150 minutes, and carry out billet rolling on a rolling mill. After one rolling, a slab of 40 mm is obtained, and the total deformation in step 2 is 67%. .

[0041] Step 3: Grind the cracks on the surface of the slab obtained in step 2, keep the slab in a heating furnace at a temperature of 990°C for 80 minutes, and roll it to obtain a 15mm billet. The total deformation of the rolli...

Embodiment 2

[0050] Preparation of 650℃ Titanium Alloy Sheet with Thickness of 1.5mm for Low Temperature Superplastic Forming

[0051] Step 1, smelting a 650°C titanium alloy ingot whose target composition is Ti-5.8Al-4.0Sn-3.5Zr-0.5Mo-0.5Si-0.3Nb–1.0Ta–0.7W-0.05C ℃ heat preservation for 240min, carry out slab forging on the forging machine, the final forging temperature is not lower than 1000 ℃, obtain the slab for rolling, the slab size is 120mm×450mm×850mm.

[0052] Step 2: heat the slab obtained in step 1 in a heating furnace at a temperature of 1080° C. for 120 minutes, and carry out billet rolling on a rolling mill. After one rolling, a slab of 35 mm is obtained, and the total deformation in step 2 is 71%. .

[0053] Step 3: Grinding the cracks on the surface of the slab obtained in step 2, keeping the slab in a heating furnace at a temperature of 1000°C for 70 minutes, and rolling to obtain a 13mm billet, the total deformation of the rolling in step 3 is 63 %.

[0054] Step 4: Af...

Embodiment 3

[0062] Preparation of 650℃ Titanium Alloy Sheet with Thickness of 0.8mm for Low Temperature Superplastic Forming

[0063] Step 1, smelting the 650°C titanium alloy ingot whose target composition is Ti–5.4Al-4.0Sn-3.5Zr-0.8Mo-0.3Si-0.4Nb-1.0Ta-0.7W-0.05C ℃ heat preservation for 240min, carry out slab forging on the forging machine, the final forging temperature is not lower than 1000 ℃, obtain the slab for rolling, the slab size is 120mm×450mm×850mm.

[0064] Step 2, heat the slab obtained in step 1 in a heating furnace at a temperature of 1100°C for 100 minutes, and carry out billet rolling on a rolling mill. After one rolling, a 30mm slab is obtained, and the total deformation in step 2 is 75%. .

[0065] Step 3: Grind the cracks on the surface of the slab obtained in step 2, keep the slab in a heating furnace at a temperature of 1010°C for 60 minutes, and roll it to obtain a 12mm billet. The total deformation of the rolling in step 3 is 60 %.

[0066] Step 4: After cuttin...

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Abstract

The invention provides a preparation method of a 650 DEG C high-temperature titanium alloy sheet for superplastic forming. The preparation method adopts hot rolling machining to obtain 650 DEG C titanium alloy sheets with excellent superplastic properties. The preparation method comprises the steps that (1) after a 650 DEG C titanium alloy casting ingot is heated, cogging and forging are carried out, and a sheet blank for titanium alloy rolling is obtained; (2) after the obtained sheet blank is coated with a coating and is heated, cogging and rolling are carried out on a rolling machine; (3) after the sheet blank is heated, second rolling is carried out; (4) after the sheet blank is subjected to heat treatment above the beta phase transformation point, rapid water quenching cooling is carried out; (5) after the sheet blank is heated, third hot rolling is carried out; (6) after the sheet blank is heated, fourth reversing hot rolling is carried out; (7) the obtained blank is assembled and welded, and a coated overlapping rolling package is obtained; (8) after the overlapping rolling package is heated, hot rolling is carried out, and a semi-finished sheet is obtained; and (9) after the semi-finished sheet is subjected to creep deformation and forming correction, annealing and acid and alkali washing, a finished 650 DEG C titanium alloy sheet with thickness of 0.8-2.0 mm is obtained.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a method for preparing a 650°C high-temperature titanium alloy sheet for superplastic forming. Background technique [0002] High-temperature titanium alloys are widely used in high-temperature components of aero-engines and aerospace vehicles due to their high specific strength, high-temperature resistance, and excellent comprehensive mechanical properties. The maximum service temperature of existing mature high-temperature titanium alloys at home and abroad is 600°C, but there are few foreign reports on high-temperature titanium alloys with a long-term service temperature of 650°C. With the continuous improvement of the flying speed of adjacent space vehicles and the operating temperature of aero-engines, alloys are required to have good comprehensive mechanical properties such as room temperature tensile, high temperature tensile and cree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18B21B3/00
Inventor 王清江陈志勇刘建荣朱绍祥吴汐玥
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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