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Moderate intensity titanium alloy and preparing method thereof

A titanium alloy and high-strength technology, which is applied in the field of high-strength titanium alloys, can solve the problems of low impact toughness and achieve the effects of improving impact toughness, reducing costs, and improving strength and plasticity

Inactive Publication Date: 2018-01-12
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the conventional characteristics of existing titanium alloys and the short plate with low impact toughness value, a medium-strength titanium alloy grade is designed, so that the alloy can meet the V-notch impact toughness under the premise of maintaining the strength and plasticity. The high requirement that the index be stable above 40J is a technical problem that needs to be solved urgently

Method used

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  • Moderate intensity titanium alloy and preparing method thereof
  • Moderate intensity titanium alloy and preparing method thereof
  • Moderate intensity titanium alloy and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Use 0-1 grade sponge titanium substrate raw materials, add intermediate alloys aluminum vanadium, aluminum molybdenum, iron, aluminum, mix evenly, and press into a titanium alloy electrode of Φ120mm. The pressed electrode blocks are connected by vacuum welding, and then second vacuum self-consumption melting is used to make a Φ190mm titanium alloy ingot. The chemical composition of the ingot is shown in Table 1.

[0029] (2) The titanium alloy ingot is forged and opened, and then formed and forged. The thermal processing process has a deformation amount of 75% in the single-phase region (≥960°C), and a deformation amount of 80% in the two-phase region (880-890°C). %. Made into Φ25mm rod, the phase transition point of the rod is 928°C.

[0030] (3) Carry out heat treatment to the prepared rod, heat treatment system: heating and holding at 890° C. for 2 hours, then air cooling.

[0031] The mechanical properties of the product are shown in Table 2, and its microstr...

Embodiment 2

[0033] (1) Use 0-1 grade sponge titanium substrate raw materials, add intermediate alloys aluminum vanadium, aluminum molybdenum, iron, aluminum, mix evenly, and press into a titanium alloy electrode of Φ120mm. The pressed electrode blocks are connected by vacuum welding, and then second vacuum self-consumption melting is used to make a Φ190mm titanium alloy ingot. The chemical composition of the ingot is shown in Table 1.

[0034] (2) The titanium alloy ingot is forged and opened, and then formed forging. The thermal processing process has a deformation amount of 60% in the single-phase region (≥960°C), and a deformation amount of 65% in the two-phase region (880-890°C). %. Made into a Φ25mm rod, the phase transition point of the rod is 937°C.

[0035] (3) Carry out heat treatment to the prepared rod, heat treatment system: heating and holding at 900° C. for 2 hours, then air cooling.

[0036] The mechanical properties of the product are shown in Table 2, and its microstru...

Embodiment 3

[0038] (1) Use 0-1 grade sponge titanium substrate raw materials, add intermediate alloys aluminum vanadium, aluminum molybdenum, iron, aluminum, mix evenly, and press into a titanium alloy electrode of Φ120mm. The pressed electrode blocks are connected by vacuum welding, and then second vacuum self-consumption melting is used to make a Φ190mm titanium alloy ingot. The chemical composition of the ingot is shown in Table 1.

[0039] (2) The titanium alloy ingot is forged and opened, and then formed and forged. The thermal processing process has a deformation of 85% in the single-phase region (≥960°C), and a deformation of 90% in the two-phase region (880-890°C). %. Made into Φ25mm rod, its phase transition point is 945°C.

[0040] (3) Carry out heat treatment to the prepared rod, heat treatment system: heat and keep at 910° C. for 2 hours, and air cool.

[0041] The mechanical properties of the product are shown in Table 2, and its microstructure is shown in image 3 .

[00...

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Abstract

The invention relates to a moderate intensity titanium alloy and a preparing method thereof. The moderate intensity titanium alloy comprises chemical components, by mass percent, 3.5%-4.5% of Al, 2.5%-3.5% of V, 0.5%-1.5% of Mo, 1.0%-2.0% of Fe, not larger than 0.10% of C, not larger than 0.15% of O, not larger than 0.05% of N, not larger than 0.0125% of H and the balance Ti and unavoidable impurities. According to the moderate intensity titanium alloy prepared through the method, the tensile strength Rm is larger than or equal to 895 MPa, the yield strength Rp0.2 is larger than or equal to 825 MPa, the ductility A is larger than or equal to 10%, the percentage reduction Z of the area is larger than or equal to 25%, and the ballistic work AKV is larger than or equal to 50 J. The strength and the plasticity of the titanium alloy are equal to those of a TC4 alloy, the impact toughness is greatly improved, and the moderate intensity titanium alloy can be applied to the working conditionswith high impact requirements.

Description

technical field [0001] The invention belongs to the technical field of high-strength titanium alloys, specifically relates to a medium-strength titanium alloy and a preparation method thereof, and more specifically relates to a Ti-4Al-3V-1Mo-1Fe series medium-strength titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloys have the following common characteristics: the specific gravity of titanium alloy is 4.5g / cm 2 , high specific strength; has relatively good seawater corrosion resistance; has high specific strength and extremely strong CO 2 +H 2 S+Cl - Corrosion resistance; medium-strength titanium alloy has good formability, which can meet the processing and forming requirements of plates and tubes; titanium alloy has good elasticity (σ s / E large) and good anti-ballistic properties are also conducive to the application of titanium. Because of the above-mentioned excellent characteristics of titanium alloy, it is widely used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
Inventor 吴英彦计波张春霞贾如雷许正芳
Owner 宝武特种冶金有限公司
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