Near-beta ultrahigh-strength titanium alloy with tensile strength of more than 1450 MPa and preparation method thereof

A high-strength titanium alloy and tensile strength technology, applied in the field of near-beta ultra-high-strength titanium alloy and its preparation, can solve problems such as restricting application, contradiction between strength performance and plasticity and toughness, plasticity decline, etc., to promote engineering application, shorten The effect of development cycle and reduction of development cost

Active Publication Date: 2020-06-12
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for titanium alloys, its strength properties are often in conflict with plasticity and toughness
Existing high-strength titanium alloys generally sacrifice their plasticity and toughness while improving their strength. For example, taking the latest Ti-5553 high-strength titanium alloy as an example, this alloy has excellent strong-plasticity matching at the 1200MPa level and Fatigue performance, with the further increase of its strength, the plasticity decreases significantly, which seriously restricts its further application under higher strength conditions

Method used

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  • Near-beta ultrahigh-strength titanium alloy with tensile strength of more than 1450 MPa and preparation method thereof
  • Near-beta ultrahigh-strength titanium alloy with tensile strength of more than 1450 MPa and preparation method thereof
  • Near-beta ultrahigh-strength titanium alloy with tensile strength of more than 1450 MPa and preparation method thereof

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Effect test

Embodiment 1

[0027] A method for preparing a Ti-Al-V-Mo-Cr series near-β ultra-high-strength titanium alloy with a tensile strength greater than 1450MPa, comprising the following steps:

[0028] (1) Determine the main component system of the new ultra-high-strength titanium alloy, and realize the active optimization design of the composition of the new ultra-high-strength titanium alloy: based on the principle of multi-component strengthening under the condition of critical molybdenum equivalent, the new ultra-high-strength titanium alloy is calculated using first principles combined with CALPHAD calculation tools. The type and scope of the main components of high-strength titanium alloys, and then check the main components of the newly obtained new ultra-high-strength titanium alloys through the composition design method, and finally determine the main composition system of the new ultra-high-strength titanium alloys. The composition design method includes molybdenum equivalent and d elect...

Embodiment 2

[0033] A method for preparing a near-beta ultra-high-strength titanium alloy with a tensile strength greater than 1450MPa, comprising the following steps:

[0034] (1) In this embodiment, the main component system of the ultra-high-strength titanium alloy is: according to the weight percentage, aluminum 3%-4%, vanadium 6%-7%, molybdenum 5%-6%, chromium 1.5%-3%, Iron 0.5% ~ 2%;

[0035] (2) Prepare a titanium alloy ingot with uniform chemical composition and structure through three times of vacuum consumable melting, measure its β transformation temperature as 830-840°C, carry out billet forging in the temperature range of 1050-1100°C, and break the original coarseness of the ingot Then gradually reduce the forging temperature to below the phase transition point for repeated upsetting and drawing forging, and realize the static and dynamic recrystallization of its microstructure through multiple times of forging, and coordinate its microstructure and performance;

[0036] (3) ...

Embodiment 3

[0039] A method for preparing a near-beta ultra-high-strength titanium alloy with a tensile strength greater than 1450MPa, comprising the following steps:

[0040] (1) In this embodiment, the main component system of the ultra-high-strength titanium alloy is: by weight percentage, aluminum 5.5%-7%, vanadium 2%-4%, molybdenum 3%-5%, chromium 4%-5.5%, Zirconium 2% ~ 3%;

[0041] (2) Prepare a titanium alloy ingot with uniform chemical composition and structure through three times of vacuum self-consumption smelting, measure its β transformation temperature as 840-850°C, carry out billet forging in the temperature range of 1050-1100°C, and break the original coarseness of the ingot Then gradually reduce the forging temperature to below the phase transition point for repeated upsetting and drawing forging, and realize the static and dynamic recrystallization of its microstructure through multiple times of forging, and coordinate its microstructure and performance;

[0042] (3) Pe...

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Abstract

The invention provides a near-beta ultrahigh-strength titanium alloy with the tensile strength of more than 1450 MPa. The volume fraction of a primary alpha phase in the near-beta ultrahigh-strength titanium alloy is 15-30%, and a secondary alpha phase is uniformly distributed on a beta matrix. The preparation method comprises the following steps: (1) determining a main component system of the novel ultrahigh-strength titanium alloy; (2) measuring the beta transformation temperature, performing cogging forging above the beta transformation temperature of a titanium alloy cast ingot, and then gradually reducing the forging temperature to below the beta transformation temperature for repeated upsetting-drawing forging; (3) setting the temperature of the finish forging process below the betatransition temperature to obtain an ultrahigh-strength titanium alloy forging stock; and (4) carrying out solid solution treatment and double aging strengthening treatment on the ultrahigh-strength titanium alloy forging stock in a hot working state to obtain the near-beta ultrahigh-strength titanium alloy with the tensile strength of more than 1450 MPa. The strength of the ultrahigh-strength titanium alloy is more than 1450 MPa, and simultaneously, the requirements for comprehensive performance such as good plasticity, good toughness and the like can be met.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a near-beta ultrahigh-strength titanium alloy with a tensile strength greater than 1450 MPa and a preparation method thereof. Background technique [0002] As a new type of light metal material developed in recent decades, titanium alloy has excellent comprehensive performance matching such as strength, modulus, toughness, high damage tolerance, corrosion resistance and weldability, thus becoming one of the main structural materials of advanced aircraft. The application of titanium and titanium alloys in the aircraft body structure can achieve good weight reduction benefits and meet the design needs of high maneuverability, high reliability and long life of the aircraft. The amount has become an important symbol to measure the advanced level of aircraft material selection. [0003] Titanium alloys have experienced the development process from low strength, medium strength t...

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 刘运玺周琳付明杰陈玮
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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