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Novel high strength and toughness titanium alloy

A technology of tough titanium alloy and titanium alloy, which is applied in the field of high-strength and high-toughness titanium alloy, can solve the problems affecting alloy performance and poor fracture toughness, and achieve the effects of low phase transition point, strong hardenability and good structural stability

Inactive Publication Date: 2010-06-30
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the strength of the alloy can reach the high-strength standard, but the fracture toughness is slightly poor
At the same time, because the alloy contains 2% Fe, it is easy to produce "β spots" due to component segregation during smelting, and segregation problems will occur when heat treatment is carried out slightly lower than the matrix transformation temperature, thereby affecting the performance of the alloy

Method used

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  • Novel high strength and toughness titanium alloy
  • Novel high strength and toughness titanium alloy
  • Novel high strength and toughness titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]According to the determined alloy composition, the following alloy materials are selected for batching: commercially available sponge titanium, sponge zirconium, metal chromium, metal aluminum beans, Ti-Sn master alloy, Ti-Mo master alloy, and Al-V master alloy are prepared into a single block Electrode, a single electrode is assembled and welded into a consumable electrode in a vacuum welding box, and the consumable electrode is melted three times in a vacuum consumable melting furnace to prepare an ingot. The chemical composition of the ingot is shown in Table 1.

[0043] Chemical composition (wt%) of table 1 ingot

[0044]

[0045] The alloy is billet-forged at the phase transition point of 1150°C, and after forging at 820°C, it is made into a φ110mm billet. After the billet is heated to 900°C or 820°C, it is forged into a 36mm×67mm bar on a precision forging machine. After being treated by the heat treatment system listed in Table 2, the mechanical performance tes...

Embodiment 2

[0050] According to the determined alloy composition, the following alloy materials are selected for batching: commercially available sponge titanium, sponge zirconium, metal chromium, metal aluminum beans, Ti-Sn master alloy, Ti-Mo master alloy, and Al-V master alloy are prepared into a single block Electrode, a single electrode is assembled and welded into a consumable electrode in a vacuum welding box, and the consumable electrode is vacuum consumable smelted three times in a vacuum consumable melting furnace to prepare an ingot. The chemical composition of the ingot is shown in Table 3.

[0051] Chemical composition (wt%) of table 3 ingot

[0052]

[0053] The alloy is billet-forged at the phase transition point of 1150°C, and after forging at 820°C, it is made into a φ110mm billet. After the billet is heated to 900°C or 820°C, it is forged into a 36mm×67mm bar on a precision forging machine. After being treated by the heat treatment system listed in Table 4, the mechan...

Embodiment 3

[0057] According to the determined alloy composition, the following alloy materials are selected for batching: commercially available sponge titanium, sponge zirconium, metal chromium, metal aluminum beans, Ti-Mo master alloy, and Al-V master alloy are prepared into monolithic electrodes. The consumable electrode was assembled and welded in the vacuum welding box, and the consumable electrode was smelted three times in the vacuum consumable melting furnace to prepare an ingot. The chemical composition of the ingot is shown in Table 5.

[0058] Chemical composition (wt%) of table 5 ingot

[0059]

[0060] The alloy is billet-forged at the phase transition point of 1150°C, and after forging at 820°C, it is made into a φ110mm billet. After the billet is heated to 900°C or 820°C, it is forged into a 36mm×67mm bar on a precision forging machine. After being treated by the heat treatment system listed in Table 6, the mechanical properties were tested according to the requirements...

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Abstract

The invention relates to a novel high strength and toughness titanium alloy which includes (by weight percent): 2.0-5.5 % of Al, 2.0-8.0 % of Mo and 2.0-6.0 % of V, wherein the ratio of Mo to V is 1 / 3-4. The titanium alloy contains 2.0-5.0 % of Cr or Cr and Fe (at most 0.9 % of Fe), the relationship k beta =CMo / 11+CV / 14.9+CCr / 6.5+CFe / 5 is satisfied and the value is 0.85-1.4. The titanium alloy also contains less than or equal to 0.10% of Si, less than or equal to 0.10% of O and less than or equal to 0.01% of H, the content of the rest components is controlled according to that of normal titanium alloy, and the allowance is Ti. The titanium alloy can also contain one or two of the neutral elements of Zr, Hf, Sn, each of which accounts for 0.15-3.5%. The titanium alloy has strong hardenability and good structure stability under high temperature, and segregation and fragile intermetallic compounds can be prevented. The titanium alloy has good pressure workability and welding property and has good tensile ductility and forgeability.

Description

technical field [0001] The invention relates to a titanium alloy, in particular to a novel high-strength and high-toughness titanium alloy. Background technique [0002] In recent years, with the development of material science and the impact of the energy crisis, the aerospace industry has an increasingly urgent need for new structural materials with high strength and high fracture toughness. Therefore, it is imperative to develop a new type of high-strength and high-toughness titanium alloy with independent intellectual property rights that can replace ultra-high-strength steel and be used for large-scale load-bearing parts of aviation. The so-called high-strength and high-toughness titanium alloy generally refers to the tensile strength of more than 1000MPa, the fracture toughness of 55MPa m 1 / 2 Above, and has good plasticity titanium alloy. At present, the main representative high-strength and high-toughness titanium alloys at home and abroad are Ti-10V-2Fe-3Al, Ti-5Al...

Claims

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Application Information

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IPC IPC(8): C22C14/00
Inventor 付艳艳惠松骁叶文君宋月清
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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