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Light-weight, high-strength, and high-elasticity titanium alloy and implementation method thereof

Inactive Publication Date: 2020-03-05
ZHEJIANG SHENJI TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a titanium alloy that uses Al as a main alloy element to improve strength, stabilize the α phase, and reduce density. The addition of a small amount of V helps improve forming ability while inhibiting crystal nucleus and refining grains to ensure high plasticity under high strength conditions. The alloy also includes elements like Cr and Zr to improve strength, oxidation resistance, and inhibit the generation of new phases. The alloy has good high-temperature strength and is easy to produce and process. These technical effects make the titanium alloy ideal for use in high-strength applications such as aerospace applications.

Problems solved by technology

However, since an intermetallic compound material has characteristics of an atom long range ordered arrangement and coexistence of a metal bond and a covalent bond, high temperature strength is excellent, and meanwhile, an alloy is relatively low in plasticity which is a maximum obstacle for engineering application.
The titanium alloy is relatively large in a yield limit and elastic limit ratio, high in a yield ratio, large in an amount of deformation resistance and deformation rebound, relatively low in plasticity, difficult to deform, and complicated in preparation processing, therefore a manufacturing cost of the titanium alloy is high, which also has an influence on application and promotion of the titanium alloy to more fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030]Properties of 10.0 mm finished product in this example.

YieldTensileElasticProcessThicknessstrengthstrengthElongationmodulusroute(mm)(MPa)(MPa)(%)(KN / mm2)Process 110.54 TNote 11026111911.66125.22Process 210.49 T1031113011.92129.52Process 310.55 T1053111512.38128.28Note 1Tests taken transverse to the direction of rolling.

[0031]A specific operation of process 1 was as follows. Hot rolling and cogging were performed at 950° C. to 1050° C. and a deformation amount was 60% to 80%; a deformation amount at 900° C. to 1030° C. was 45% to 75%; and a finished product was prepared after pickling was performed at 400° C. to 550° C.

[0032]A specific operation of process 2 was as follows. Hot rolling and cogging were performed at 950° C. to 1050° C. and a deformation amount was 60% to 80%; a finished product specification was prepared by rolling with a deformation amount of 50% to 70% at 900° C. to 1030° C.;

[0033]annealing was performed at 780° C. to 860° C. and time for heat insulation was 0...

example 2

[0035]Properties of 5.0 mm finished product in this example.

YieldTensileElasticProcessThicknessstrengthstrengthElongationmodulusroute(mm)(MPa)(MPa)(%)(KN / mm2)Process 45.08 LNote 21042113612.82121.545.15 TNote 31059115213.30122.30Process 55.0 L1026114111.60128.085.0 T1019116612.02124.935.0 L1022113312.12126.625.0 T1030114812.88116.82Note 2Tests taken longitudinal to the direction of rolling, the following is same.Note 3Tests taken transverse to the direction of rolling, the following is same.

[0036]A specific operation of process 4 was as follows. Hot rolling was performed at 920° C. to 1030° C. and a deformation amount was 40% to 70%; a finished product specification was prepared by rolling with a deformation amount of 50% to 70% at 900° C. to 1000° C.; and finally a finished product was prepared after pickling was performed at 400° C. to 550° C.

[0037]A specific operation of process 5 was as follows. Hot rolling was performed at 950° C. to 1050° C. and a deformation amount was 50% to...

example 3

[0038]Properties of 4.0 mm finished product in this example.

YieldTensileElasticProcessThicknessstrengthstrengthElongationmodulusroute(mm)(MPa)(MPa)(%)(KN / mm2)Process 64.36 L1031112913.94120.824.35 T1045113214.76122.13Process 74.34 L1139115113.12118.084.36 T1107113713.86118.934.38 L1140114112.84116.624.22 T1059113813.42116.97Process 84.20 L1129117210.36120.384.22 T1119116212.58117.38

[0039]A specific operation of process 6 was as follows. Hot rolling was performed at 950° C. to 1050° C. and a deformation amount was 50% to 80%; rolling was performed at 900° C. to 1030° C. with a deformation amount of 40% to 70%; annealing was performed at 750° C. to 880° C. and time for heat insulation was 1 h to 2 h; a finished product specification was prepared by cold rolling; further annealing was performed at 780° C. to 860° C. and time for heat insulation was 1 h to 2 h; and finally a finished product was prepared after pickling was performed at 400° C. to 550° C.

[0040]A specific operation of pro...

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Abstract

A light-weight, high-strength, and high-elasticity titanium alloy and an implementation method thereof. The titanium alloy is specifically Ti-8Al-2V-1Cr-0.75Zr, wherein the content of Al is 7.0% to 9.5%, the content of V is 0.5% to 4.0%, the content of Cr is 0.5% to 3.5%, the content of Zr is 0.5% to 2.0%, and the balance is Ti. The titanium alloy is obtained by vacuum arc remelting(VAR), after mold pressing through the adoption of sponge titanium, vanadium, chromium, aluminum zirconium pure, pure aluminum, aluminum vanadium alloy mixed consumable electrode. The titanium alloy is simple in preparation processing steps, low in processing cost, easy in production, and is applicable to various application fields with a requirement for a low-density and high-strength titanium alloy.

Description

[0001]This application claims priority to Chinese Patent Application Ser. No. CN201811007924.9 filed on 31 Aug. 2018.TECHNICAL FIELD[0002]The invention relates to the technical field of titanium alloy, in particular to an α+β two-phase titanium alloy SJ1100 with density less than 4.40 g / cm3, annealing state strength larger than 1100 MPa, elongation larger than 10%, and elastic modulus less than 130 GPa, and an implementation method thereof.BACKGROUND ART[0003]In recent year, since energy prices increase constantly, requirements for environments are stricter, and a light-weight requirement is proposed in automotive manufacturing industries as well. If a weight of a car can be reduced by 10%, oil consumption can be reduced by 8% to 10%.For every 1 kg weight reduction of an aircraft and an engine, a usage cost thereof can typically save $220-440 / hour. Therefore, it is extremely urgent to increase a strength and weight ratio of materials.[0004]Ti3Al-base alloy belongs to a Ti—Al based i...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183C22C1/03
Inventor CHEN, XIULINYUAN, QINFENGYANG, DINGHONG
Owner ZHEJIANG SHENJI TITANIUM IND
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