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Near-beta type titanium alloy with good matching of strength and plasticity and preparation method thereof

A technology of titanium alloy and plasticity, which is applied in the field of near-β-type titanium alloy and its preparation, can solve the problems of high cost and cumbersome process, and achieve good plasticity, optimized strength and plasticity matching, and remarkable effect of solid solution strengthening

Active Publication Date: 2021-02-23
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of cumbersome process and high cost in preparing near-β-type titanium alloys with good strength and plasticity matching in the prior art, and provide a near-β-type titanium alloy with good strength and plasticity matching and its preparation method

Method used

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  • Near-beta type titanium alloy with good matching of strength and plasticity and preparation method thereof
  • Near-beta type titanium alloy with good matching of strength and plasticity and preparation method thereof
  • Near-beta type titanium alloy with good matching of strength and plasticity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 prepares nearly β type titanium alloy and comprises the following steps:

[0027] Step 1, adopt powder metallurgy method to prepare nearly β type titanium alloy ingot, the composition of near β type titanium alloy ingot is, by mass percentage, 5%Al, 5%Mo, 5%V, 3%Cr and 0.36% O, the rest is Ti and unavoidable impurities. After the alloy ingot is upset and forged, it is rolled into a φ11.5mm bar;

[0028] Step 2: heating the alloy bar at 600° C. for 1 hour, and then air cooling to room temperature to obtain a nearly β-type titanium alloy with good matching of strength and plasticity.

[0029] see figure 1 , figure 1 It is the microstructure figure of the near β type titanium alloy after the heat treatment of embodiment 1 from figure 1 It can be seen that the alloy exhibits the characteristics of layered heterogeneous multi-level second phase structure after heat treatment. Among them, the heterogeneous mixed crystals include ultrafine β grains and coarser...

Embodiment 2

[0032] Embodiment 2 prepares nearly β type titanium alloy and comprises the following steps:

[0033] Step 1, adopt powder metallurgy method to prepare alloy ingot of nearly β type titanium alloy, the composition of near β type titanium alloy ingot is, by mass percentage, 5% Al, 5% Mo, 5% V, 3% Cr and 0.36% O, the rest is Ti and unavoidable impurities; after the alloy ingot is upset and forged, it is rolled into a φ11.5mm bar;

[0034] Step 2: Heat the alloy bar at 630° C. for 1 hour, and then cool it to room temperature in air to obtain a nearly β-type titanium alloy with good matching of strength and plasticity.

[0035] see figure 2 , figure 2 Be the microstructure diagram of the near β type titanium alloy after the heat treatment of embodiment 2, from figure 2 It can be seen that the alloy exhibits the characteristics of layered heterogeneous multi-level second phase structure after heat treatment. Among them, the heterogeneous mixed crystals include ultrafine β gra...

Embodiment 3

[0038] Embodiment 3 prepares nearly β type titanium alloy and comprises the following steps:

[0039] Step 1, adopt powder metallurgy method to prepare alloy ingot of nearly β type titanium alloy, the composition of near β type titanium alloy ingot is, by mass percentage, 5%Al, 5%Mo, 5%V, 3%Cr and 0.36% O, and the rest is Ti and unavoidable impurities. After the alloy ingot is upset and forged, it is rolled into a φ11.5mm bar;

[0040] Step 2: Heat the alloy bar at 660° C. for 1 hour, and then cool it to room temperature in air to obtain a near-β-type titanium alloy with a good match between strength and plasticity.

[0041] see image 3 , image 3 Be the microstructural figure of the nearly β type titanium alloy after the heat treatment of embodiment 3, from image 3It can be seen that the alloy exhibits the characteristics of layered heterogeneous multi-level second phase structure after heat treatment. Among them, the heterogeneous mixed crystals include ultrafine β gra...

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Abstract

The invention discloses a near-beta type titanium alloy with good matching of strength and plasticity and a preparation method thereof, and belongs to the field of titanium alloys. According to the preparation method, medium-sized crystal grains in the sintered alloy are crushed and refined after upsetting, drawing and cogging in a single-phase region. Then a rolled bar is subjected to one-step quasi-beta bar rolling at a phase transformation point by utilizing a relatively high phase transformation point caused by high oxygen content of the alloy, crystal grains are crushed again, and a coordinated structure of non-uniform crystal grains and a multi-stage layered second phase is realized by virtue of dynamic precipitation and partial recrystallization of the second phase under the actionof thermal coupling. Non-uniform mixed crystals comprise ultrafine beta crystal grains and coarse beta crystal grains, and the multi-stage layered second phase comprises a layered primary alpha phase,a strip-shaped grain boundary alpha phase and a beta transformation structure. After short-time heat treatment, the non-uniform mixed crystal structure is reserved, the multi-stage layered second phase is increased from ternary to quaternary through the separated fine-needle-shaped alpha phase, and the alloy maintains good plasticity while having high strength.

Description

technical field [0001] The invention belongs to the field of titanium alloys, in particular to a nearly β-type titanium alloy with good strength and plasticity matching and a preparation method thereof. Background technique [0002] As a new type of lightweight metal material that has developed rapidly in the past 20 years, titanium alloy has excellent comprehensive properties such as strength, modulus, weldability, corrosion resistance, and biocompatibility, and has become the main structure of modern aircraft, aeroengines, aerospace, ships, etc. Material. With the development of aircraft, engines, aerospace, etc., not only the strength level of titanium alloy is required to be continuously improved, but also the plasticity of the alloy is required to be maintained at a certain level, that is, the strength and plasticity must be well matched. [0003] In recent years, in order to make the strength of titanium alloy reach more than 1300 MPa and the elongation rate higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/18
CPCC22C14/00C22C1/0458C22F1/183
Inventor 赵秦阳
Owner CHANGAN UNIV
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