High-speed impact resistance, high-strength and high-toughness titanium alloy

A technology of high-speed impact and tough titanium alloy, which is applied in the field of high-speed impact-resistant, high-strength and high-toughness titanium alloy, can solve the problems that it is difficult to further improve the strength, and achieve the effect of expanding the application field

Inactive Publication Date: 2016-04-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the BT22 alloy can reach 1080MPa in the annealed state, and the strength of the alloy can reach 1100-1300MPa after heat treatment, but it is difficult to further increase its strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The raw materials of Ti-3.5Al-1.0Fe-4.0V-4.5Cr alloy are: 0 grade sponge titanium, Al bean, pure Cr, Fe-80V master alloy, and the ingredients are mixed according to the proportion of Table 1 and pressed into consumable after mixing The electrodes are smelted in a secondary vacuum consumable electric arc furnace to obtain Ti-3.5Al-1.0Fe-4.0V-4.5Cr alloy ingots. The alloy ingot is billeted at 1000°C with a deformation of 60%. It adopts multiple cooling and reversing forging, the final forging temperature is 780-820°C, and the cumulative deformation is 80% to make a 900×75×35mm square bar. The phase transition point of the alloy measured by metallographic method is 840~850℃. Cut samples from the square bar and conduct 800℃ / 0.5h / FC heat treatment. The ratio of the primary α-phase in the primary form is 20%, and the ratio of the horizontal and vertical directions of the primary α-phase is between 1 and 1.5. The Hopkinson pressure rod experiment measured the maximum uniform p...

Embodiment 2

[0018] The raw materials of Ti-3.0Al-2.0Fe-8.0V-1.0Cr alloy are: 0 grade sponge titanium, Al bean, pure Cr, Fe-80V master alloy, and the ingredients are mixed according to the proportion of Table 2 and pressed into consumable after mixing. The electrodes are smelted in a secondary vacuum consumable electric arc furnace to obtain Ti-3.0Al-2.0Fe-8.0V-1.0Cr alloy ingots. The alloy ingot is billeted at 1050°C, with a deformation of 60%, adopts multiple cooling and reversing forging, the final forging temperature is 780~820°C, and the cumulative deformation is 80%. After rolling in the two-phase zone, a rod of φ12mm is made material. The phase transition point of the alloy measured by metallographic method is 820~830℃. Cut samples from the square bar and conduct heat treatment at 780°C / 0.5h / AC. The ratio of the primary α-phase in the primary form is 10%, and the ratio of the horizontal and vertical directions of the primary-form α phase is between 1 and 1.8. The Hopkinson pressure...

Embodiment 3

[0023] The raw materials of Ti-2.5Al-0.85Fe-3.5V-5.0Cr alloy are: 0 grade sponge titanium, Al bean, Fe-50Cr master alloy, pure Cr, Fe-80V master alloy, and the ingredients are prepared according to the proportion of Table 3, After mixing, it is pressed into a consumable electrode, which undergoes a vacuum consumable electric arc furnace smelting and an electron beam cooling bed furnace smelting to obtain a Ti-2.5Al-0.85Fe-3.5V-5.0Cr alloy flat ingot. The alloy slab ingot is directly rolled at 1050℃ and the deformation is 30%. It adopts multiple cooling rolling, and the final rolling temperature is 780~800℃. The cumulative deformation is 90%, and the plate of δ35×300×1000mm is made; metallographic method The measured phase transition point of the alloy is 820~830℃. Sampling the cut material of the board, heat treatment at 810℃ / 0.5h / FC, the ratio of the primary α-phase in the primary form is 5%, and the ratio of the horizontal and vertical directions of the primary-form α phase i...

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Abstract

The invention discloses a high-speed impact resistance, high-strength and high-toughness titanium alloy, and belongs to the technical field of preparation of high-strength alloys. The high-speed impact resistance, high-strength and high-toughness titanium alloy is specifically a Ti-Al-Fe-V-Cr alloy; the alloy comprises the following components in percentage by weight: 2.5-3.5% of Al, 0.85-2.35% of Fe, 3.0-8.0% of V, 1.0-5.0% of Cr, impurities less than 0.2%, and the balance of Ti; all the components are mixed for pressing to prepare a consumable electrode; and the consumable electrode is smelted by a secondary vacuum consumable electro-arc furnace to obtain a Ti-Al-Fe-V-Cr alloy ingot. The titanium alloy strictly controls influence on high-speed impact resistance by the contents of Cr and Fe and the content of a primary alpha phase, determines an optimal transverse-longitudinal rate, performs a Hopkinson compression bar test to measure the maximum uniform plastic strain as 0.25-0.14 and the impact absorbing energy as 360 MJ/m3, satisfies the use in a high-speed impact state, and facilitates to widen the application field.

Description

Technical field [0001] The invention belongs to the technical field of high-strength alloy preparation, and particularly relates to a high-strength and high-toughness titanium alloy resistant to high-speed impact. Background technique [0002] Titanium and titanium alloys have the characteristics of low density, specific strength, high specific stiffness, corrosion resistance, good high and low temperature performance and biocompatibility. Therefore, as ideal structural materials and functional materials, they are widely used in aerospace, shipbuilding, Petrochemical, marine engineering, biomedicine, architectural decoration and other fields have achieved good economic and social benefits. In the application process in these fields, titanium alloy as a structural material often bears high-speed impact loads. Titanium alloys are required to have excellent dynamic load-bearing capacity, which can still maintain the structural integrity and dimensional stability of the components m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C14/00C22C1/03C22F1/183
Inventor 于洋叶文君惠松骁宋晓云刘睿
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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