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High-strength titanium alloy containing eutectoid type beta stable elements

A technology of stabilizing elements and titanium alloys, which is applied in the field of near-β titanium alloys and high-strength titanium alloys containing eutectoid β-stabilizing elements. Excellent effect of strong plastic matching, hot workability and hardenability

Inactive Publication Date: 2016-08-03
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, except for a small amount of near-α-type titanium alloys such as Ti-6Al-1.7Fe, pure eutectoid β elements cannot be used for β-stabilization in high-strength titanium alloys, because in the absence of isomorphic β-stabilizing elements, titanium Excessive eutectoid β-stable elements in the alloy will lead to a sharp decrease in alloy plasticity, so that it cannot be applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The high-strength titanium alloy containing eutectoid β-stabilizing elements in this embodiment is composed of the following components by mass percentage: Al4.5%, Mo3%, Cr4%, Co1.5%, Fe1.5%, the balance is Ti and unavoidable of impurities. In this embodiment, the impurities include O, and the mass percentage of O in the high-strength titanium alloy is ≤0.15%.

[0018] The preparation method of the high-strength titanium alloy containing eutectoid β-stable elements in this embodiment is as follows: according to the nominal composition Ti-4.5Al-3Mo-4Cr-1.5Co-1.5Fe of the titanium alloy in this embodiment, the raw materials are selected: aluminum-molybdenum alloy, metal Chromium, metal cobalt, low-carbon ferrochromium, aluminum beans and 0-grade sponge titanium, and then mix the intermediate alloys and sponge titanium according to the designed composition to press the electrode, and then use a vacuum consumable electric arc furnace to melt it three times to form an alloy ...

Embodiment 2

[0021] In this embodiment, the high-strength titanium alloy containing eutectoid β-stabilizing elements is composed of the following mass percentages: Al5%, Mo4%, Cr3%, Co3%, Fe0.6%, and the balance is Ti and unavoidable impurities. In this embodiment, the impurities include O, and the mass percentage of O in the high-strength titanium alloy is ≤0.15%.

[0022] The preparation method of the high-strength titanium alloy containing eutectoid β-stable elements in this embodiment is as follows: according to the nominal composition Ti-5Al-4Mo-3Cr-3Co-0.6Fe of the titanium alloy in this embodiment, raw materials are selected: aluminum-molybdenum alloy, metal chromium, Metal cobalt, low-carbon ferrochromium, aluminum beans and 0-grade sponge titanium, and then mix the intermediate alloys and sponge titanium according to the design composition to press the electrode, and then use a vacuum consumable electric arc furnace to melt it into an alloy ingot three times. Three times of forgin...

Embodiment 3

[0025] In this embodiment, the high-strength titanium alloy containing eutectoid β-stabilizing elements is composed of the following components by mass percentage: Al5%, Mo3.5%, Cr3.5%, Co2%, Fe1.2%, and the balance is Ti and unavoidable of impurities. In this embodiment, the impurities include O, and the mass percentage of O in the high-strength titanium alloy is ≤0.15%.

[0026] The preparation method of the high-strength titanium alloy containing eutectoid β-stable elements in this embodiment is as follows: according to the nominal composition of the titanium alloy in this embodiment, Ti-5Al-3.5Mo-3.5Cr-2Co-1.2Fe selects raw materials: metal chromium, aluminum molybdenum Alloy, low-carbon ferrochrome, aluminum beans, low-carbon ferrochrome and grade 1 sponge titanium, and then mix the intermediate alloys and sponge titanium according to the design composition to press the electrode, and then use a vacuum consumable electric arc furnace to smelt the alloy ingot three times. ...

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Abstract

The invention provides a high-strength titanium alloy containing eutectoid type beta stable elements. The high-strength titanium alloy is composed of, by mass percent, 4.5% to 5.5% of Al, 3% to 5% of Mo, 2% to 4% of Cr, 1.5% to 3% of Co, 0.6% to 1.5% of Fe and the balance Ti and inevitable impurities. The titanium alloy contains few isomorphous beta stable elements, the eutectoid type beta stable elements of Cr, Co and Fe serve as main beta stable elements, hot workability and hardenability of the high-strength titanium alloy are excellent, the strength can be adjusted within the wide range of 900 MPa to 1600 MPa, the good strength and plasticity matching is achieved, compared with cost of a high-strength-structure titanium alloy of the same level, the cost of the high-strength titanium alloy is lower, and the requirement of multiple application fields for the performance of the high-strength titanium alloy is met.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and relates to a multi-component strengthened near-β titanium alloy, in particular to a high-strength titanium alloy containing eutectoid β-stable elements. Background technique [0002] In the existing nearly β-type and β-rich two-phase high-strength titanium alloys, the commonly used alloying scheme is 3% to 5% of the α-stable element Al plus more isomorphic β-stable elements V or Mo and a small amount The eutectoid β-stable element Cr or Fe. Typical alloys such as Ti-1023 (Ti-10V-2Fe-3Al), Ti-15-3 (Ti-15V-3Sn-3Cr-3Al), Ti-38644 (Ti-3Al-8V-6Cr-4Mo-4Zr), BT22 (Ti-5Al-5Mo-5V-1Cr-1Fe) and the new high-strength structure titanium alloy Ti-5553 (Ti-5Al-5Mo-5V-3Cr-0.4Fe) and Ti-55531 (Ti- 5Al-5Mo-5V-3Cr-1Zr). Generally speaking, the price of pure metals or intermediate alloys required to add isomorphic β-stabilizing elements to titanium alloys is much higher than that of sponge ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 葛鹏赵永庆周伟李倩辛社伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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