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Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C

A high-temperature titanium alloy and short fiber reinforced technology, which is applied in the field of titanium alloy, can solve the problems of poor plasticity, low structural strength, and unsatisfactory fatigue performance, and achieve small grain size, weakened texture strength, and uniform microstructure. Effect

Active Publication Date: 2020-04-17
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

The Widmanstatten structure has low strength, poor plasticity, and unsatisfactory fatigue perfor

Method used

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  • Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C
  • Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Ingot melting: Sponge Ti, sponge Zr, pure Al, Ti-Sn master alloy, Al-Mo master alloy, Al-Si master alloy, Al-Nb master alloy, Ti-Ta master alloy, TiB 2 Powder and C powder are mixed evenly and then pressed into electrodes. After the electrodes are welded, alloy ingots are obtained by vacuum self-consumption melting for 2 to 3 times. The ingot size is Φ540mm; Sn 2.3%, Zr 3.4%, Mo 0.7%, Si 0.25%, Nb 0.4%, Ta 0.4%, Fe 0.02%, C 0.06%, B 0.3%, O 0.13%, N 0.003%, H 0.003%, The balance is Ti and unavoidable impurities. The β transformation temperature of the ingot is 1045-1050°C.

[0028] 2) Use a resistance furnace to heat the ingot obtained in step 1) to 1200°C for 6 hours, then repeatedly upsetting and elongating with a hydraulic press for 2 fires, the forging ratio of each fire is not less than 2, and the final forging temperature is not lower than 920 ℃;

[0029] 3) Using a resistance furnace, heat the forging blank obtained in step 2) to 1150°C and keep it warm for...

Embodiment 2

[0034] 1) Ingot smelting: the preparation method of the ingot is the same as in Example 1, the difference is that the diameter of the ingot is Φ620mm, and the alloy composition of the ingot is Al 5.2%, Sn 3.2%, Zr4.1%, Mo 0.68% by mass percentage %, Si 0.3%, Nb 0.4%, Ta 0.45%, Fe 0.018%, C 0.06%, B 0.3%, O 0.12%, N 0.003%, H 0.003%, and the balance is Ti and unavoidable impurities.

[0035] 2) Use a resistance furnace to heat the ingot obtained in step 1) to 1220°C for 6 hours, then repeatedly upsetting and elongating with a hydraulic press for 2 fires, the forging ratio of each fire is not less than 2, and the final forging temperature is not lower than 920 ℃;

[0036] 3) Use a resistance furnace to heat the forging blank obtained in step 2) to 1160°C and keep it warm for 6 hours, then repeatedly upsetting and elongating with a hydraulic press for 4 fires, the forging ratio of each fire is not less than 2.4, and the total forging ratio is not less than 5.6, The final forging...

Embodiment 3

[0041] 1) Ingot smelting: The preparation method of the ingot is the same as that of Example 1, except that the diameter of the ingot is Φ460mm, and the alloy composition of the ingot is Al 5.8%, Sn 2.3%, Zr 2.4%, Mo 0.45% by mass percentage , Si 0.5%, Nb 0.2%, Ta 1.4%, Fe 0.02%, C 0.05%, B 0.65%, O 0.12%, N 0.003%, H 0.003%, and the balance is Ti and inevitable impurities.

[0042] 2) Use a resistance furnace to heat the ingot obtained in step 1) to 1200 ° C for 5 hours, and then repeatedly upsetting, drawing and forging with a hydraulic press for 2 fires, the forging ratio of each fire is not less than 2, and the final forging temperature is not lower than 920 °C;

[0043] 3) The forging billet obtained in step 2) is heated to 1150° C. and kept for 5 hours by using a resistance furnace, and then repeatedly upsetting and drawing with a hydraulic press for 3 times, the forging ratio of each fire is not less than 2.4, and the total forging ratio is not less than 5.6, The final...

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Abstract

The invention discloses a preparation method of a short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C. The alloy comprises components, by mass: 5.0%-7.0% of Al, 1.5%-4.5% of Sn, 2.0%-4.5% of Zr, 0.1%-1.0% of Mo, 0.1%-0.6% of Si, 0.1%-0.8% of Nb, 0.1%-1.8% of Ta, 0.1-1.2% of B, 0.08% or less of C, less than 0.3% of Fe, less than 0.15% of O, less than 0.05% of N, less than 0.012% of H, and the balance Ti and unavoidable impurities. The preparation method of the short fiber reinforced high-temperature titanium alloy bar comprises the following steps that electrodes are pressed according to required ingredients and smelted into an alloy ingot through vacuum arc remelting for 2-3 times; the alloy ingot is heated to 1180 DEG C-1220 DEG C and forged in a beta phase region; the forged blank is heated again until the billet is repeatedly coarsened and drawn to the required size within the range of 30 DEG C-100 DEG C below the beta phase transformation point, the macrostructure of the billet is fuzzy crystal, and visible TiB whiskers are dispersed and distributed in the microstructure. After the bar prepared by the method is subjected to solid solution and aging heattreatment, the tensile strength is obviously improved compared with a bar without B.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a method for preparing short fiber reinforced high-temperature titanium alloy rods. Background technique [0002] High-temperature titanium alloy has the advantages of low density, high specific strength, and excellent high-temperature mechanical properties. It is one of the important structural materials in the aerospace field. 700 ~ 750 ℃, representative alloys include IMI834 in the United Kingdom, Ti-1100 in the United States, BT18Y and BT36 in Russia, Ti60 in China (national standard brand TA33), etc. With the development of aviation and aerospace technology, the operating temperature and load level of aircraft shells and some high-temperature load-bearing components have been increasing, and have approached the limit of existing high-temperature titanium alloys. There is an urgent need for high-temperature titanium with higher use temperature and strength...

Claims

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Application Information

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IPC IPC(8): C22C47/08C22C49/11C22C49/14C22F1/18C21D9/00B21J5/00B21J5/06B21J5/08C22C101/22
CPCB21J5/002B21J5/06B21J5/08C21D9/0075C22C47/08C22C49/11C22C49/14C22F1/183
Inventor 赵子博王清江李文渊朱绍祥王磊
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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