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Low-cost high-strength near-beta-Ti alloy and preparation method thereof

A high-strength, low-cost technology, used in metal processing equipment and other directions, can solve the problems of increasing cost, high cost, and restricting wide application, and achieve the effect of reducing economic cost, improving plasticity, and improving oxidation resistance.

Inactive Publication Date: 2021-10-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these high-strength near-β titanium alloys contain more expensive V elements, which greatly increases their cost and limits their wide application.
Therefore, there is an urgent need to develop a low-cost, high-strength and high-toughness titanium alloy to solve the problem of high cost of titanium alloy materials and meet the growing application requirements in the aerospace field.

Method used

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  • Low-cost high-strength near-beta-Ti alloy and preparation method thereof
  • Low-cost high-strength near-beta-Ti alloy and preparation method thereof
  • Low-cost high-strength near-beta-Ti alloy and preparation method thereof

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Embodiment 1

[0028] Embodiment 1: as figure 1 As shown, the present embodiment provides a low-cost high-strength near-β-Ti alloy, including Ti, Mo, Al, Cr, Fe, and a small amount of inevitable impurity elements such as O, C, and H; wherein, by mass percentage , the mass fractions of main elements Mo, Al, Cr, and Fe are 7.37%, 3.22%, 1.83%, and 1.36%, respectively, the mass fraction of impurity elements is 0.3%, and the balance is Ti. The forged alloy samples are first obtained through alloy casting and forging processes. The melting temperature is 2400-2600 °C, the number of remelting times for the ingot is 3-5 times, and the temperature of the billet β-phase zone opening section is 900-950 °C, two-phase The zone forging temperature is 700-750°C, and the number of double-phase zone forgings is 18 times. Then the forged alloy is subjected to solution treatment at a solution temperature of 750°C for 4 hours, and then aged at 500°C for 1 hour. . The obtained near β-Ti alloy has a tensile st...

Embodiment 2

[0029] Embodiment 2: This embodiment provides a low-cost high-strength near-β-Ti alloy, including Ti, Mo, Al, Cr, Fe, and a small amount of inevitable impurity elements such as O, C, and H; wherein, by mass percentage Calculated, the mass fractions of main elements Mo, Al, Cr, and Fe are 7.37%, 3.22%, 1.83%, and 1.36%, respectively, the mass fractions of impurity elements are 0.25%, and the balance is Ti. The forged alloy samples are firstly obtained through alloy casting and forging processes, the melting temperature is 2400-2600°C, the number of remelting of the ingot is 3-5 times, the temperature of the ingot β-phase zone opening section is 900-950°C, two-phase The forging temperature in the zone is 700-750°C, and the number of forgings in the dual-phase zone is 18 times. Then, the forged alloy is subjected to solution treatment at a solution temperature of 800° C. for 4 hours, and then aged at 500° C. for 2 hours. The tensile strength of the alloy is 1557MPa, the yield st...

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Abstract

The invention relates to the technical field of alloy materials, and discloses a low-cost high-strength near-beta-Ti alloy and a preparation method thereof. The alloy comprises Ti, Mo, Al, Cr, Fe and a small amount of C, O, H and other inevitable impurity elements, wherein in percentage by mass, the mass fraction of Mo is 6-8%, the mass fraction of Al is 2-4%, the mass fraction of Cr is 1-3%, the mass fraction of Fe is 0.5-2%, the mass fraction of impurity elements is 0-0.5%, and the balance is Ti. According to the low-cost high-strength near-beta-Ti alloy, no expensive V element is added, and the economic cost of current near-beta titanium alloy is reduced. After being forged, the alloy is subjected to solid solution at 750 DEG C for 4 hours and then subjected to aging at 500 DEG C for 1 hour, the tensile strength is 1460 MPa, the yield strength is 1290 MPa, and the ductility is 8.7%; or after solid solution at 800 DEG C for 4 hours and aging at 500 DEG C for 2 hours, the tensile strength is 1557 MPa, the yield strength is 1427 MPa, and the ductility is 3.7%. Wide application of the beta-titanium alloy in the fields of aerospace, ship manufacturing industry and chemical industry is facilitated.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a low-cost high-strength near-β-Ti alloy and a preparation method thereof. Background technique [0002] Due to its light weight, high strength and high toughness, impact resistance, corrosion resistance and other excellent properties, titanium alloys have been widely used in aerospace, armored vehicles, ships, military equipment and other fields. Among different series of titanium alloys, near-β titanium alloys are in great demand in the aerospace field due to their outstanding mechanical properties. The near β titanium alloy mainly contains α phase and β phase, generally the β phase is the matrix, and the α phase is the strengthening phase. The morphology, size, distribution and volume fraction of the α phase can be adjusted by adding different alloying elements and different heat treatment systems, thereby changing the mechanical properties of the alloy. [0003] All...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B21J5/00C22C1/02C22F1/18
CPCC22C14/00C22C1/02B21J5/002C22F1/183
Inventor 宋旼刘超强胡欣
Owner CENT SOUTH UNIV
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