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A kind of low-cost ultra-high-strength ti-fe-al-cr-si series titanium alloy and its preparation method

A ti-fe-al-cr-si, ultra-high-strength technology, applied in the low-cost ultra-high-strength Ti-Fe-Al-Cr-Si series titanium alloy and its preparation, the field of β-type titanium alloy, can solve the problem of low alloy preparation Process, complexity, alloy cost reduction and other issues, to achieve the effect of great application prospects and cost reduction

Active Publication Date: 2019-10-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low content of cheap elements added and the complicated alloy preparation process (smelting + deformation + heat treatment), the cost of the alloy has not been greatly reduced. In addition, the strength of the prepared titanium alloy is still fluctuating around 1000 MPa, failing to reach super high demand

Method used

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  • A kind of low-cost ultra-high-strength ti-fe-al-cr-si series titanium alloy and its preparation method
  • A kind of low-cost ultra-high-strength ti-fe-al-cr-si series titanium alloy and its preparation method
  • A kind of low-cost ultra-high-strength ti-fe-al-cr-si series titanium alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the specific alloy ratio is Fe: 15.10wt.%; Al: 1.00wt.%; Cr: 2.02wt.%; Si: 1.50wt.%; the balance is Ti and unavoidable C, N , O, H and other impurities (the total amount of impurities is controlled within 0.3wt.%).

[0027] Place 31.590g of high-purity raw materials prepared according to the proportion in the melting pool in the vacuum electric arc furnace in the order of melting point from low to high, and pump the furnace chamber to 5×10 -3 After Pa high vacuum, it is filled with 0.5 MPa high-purity argon. Ti-15.10Fe-1.00Al-2.02Cr-1.50Si (wt.%) alloy ingot with uniform composition was obtained after repeated turning and smelting for 4 times, see attached figure 1 .

[0028] A cylindrical sample of Φ3mm×3mm was removed from the ingot, and the outer surface of the sample was polished and then tested for room temperature compression performance, with an engineering strain rate of 2×10 -3 the s -1 . The measured compressive yield strength of the all...

Embodiment 2

[0030] In this example, the specific alloy ratio is Fe: 16.47wt.%; Al: 2.07wt.%; Cr: 3.10wt.%; Si: 3.07wt.%; the balance is Ti and unavoidable C, N , O, H and other impurities (the total amount of impurities is controlled within 0.3wt.%).

[0031] Place 29.387g of high-purity raw materials prepared according to the proportion in the melting pool in the vacuum electric arc furnace in the order of melting point from low to high, and pump the furnace chamber to 5×10 -3 After Pa high vacuum, it is filled with 0.5 MPa high-purity argon. Ti-16.47Fe-2.07Al-3.10Cr-3.07Si (wt.%) alloy ingots with uniform composition were obtained after repeated turning and melting for 4 times.

[0032] A cylindrical sample of Φ3mm×3mm was removed from the ingot, and the outer surface of the sample was polished and then tested for room temperature compression performance, with an engineering strain rate of 2×10 -3 the s -1 . The compressive yield strength of the alloy was measured to be 1815 MPa, and...

Embodiment 3

[0034] In this example, the specific alloy ratio is Fe: 18.00wt.%; Al: 2.92wt.%; Cr: 3.81wt.%; Si: 3.83wt.%; the balance is Ti and unavoidable C, N , O, H and other impurities (the total amount of impurities is controlled within 0.3wt.%).

[0035] Place 29.822g of high-purity raw materials prepared according to the proportion in the melting pool in the vacuum electric arc furnace in the order of melting point from low to high, and pump the furnace chamber to 5×10 -3 After Pa high vacuum, it is filled with 0.5 MPa high-purity argon. Ti-18.00Fe-2.92Al-3.81Cr-3.83Si (wt.%) alloy ingots with uniform composition were obtained after repeated turning and smelting for 4 times.

[0036] A cylindrical sample of Φ3mm×3mm was removed from the ingot, and the outer surface of the sample was polished and then tested for room temperature compression performance, with an engineering strain rate of 2×10 -3 the s -1 . The measured compressive yield strength of the alloy is 2035 MPa, and the...

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Abstract

The invention discloses a low-cost ultra-high-strength Ti-Fe-Al-Cr-Si series titanium alloy and a preparation method thereof. The alloy comprises the following components in percentages by mass: 15-18% of Fe, 1-3% of Al, 2-4% of Cr, 1.5-4% of Si and the balance of titanium and impurities such as C, N, O and H. The preparation method of the alloy comprises the following steps: placing prepared high-purity raw materials in a smelting pond in a vacuum arc furnace from low to high, pumping air in a furnace cavity into high vacuum of 5*10<-3> Pa and then filling the furnace cavity with high-purityargon, and repeatedly smelting for 4-5 times to obtain an alloy ingot with uniform components. The compression yield strength of the titanium alloy at a room temperature reaches 1570 MPa-2000 MPa, andthe specific strength exceeds 320 kN.m / kg; and cheap elements such as Fe, Al, Cr and Si are added in the alloy, the cost is reduced by 30% or above, and the application prospect is wide.

Description

technical field [0001] The invention relates to a low-cost ultrahigh-strength Ti-Fe-Al-Cr-Si series titanium alloy and a preparation method thereof. The designed titanium alloy belongs to beta-type titanium alloy and belongs to the field of metal material engineering. Background technique [0002] At present, in order to meet the urgent needs of the world for low-carbon, environmental protection and green industries, industrial equipment is developing in the direction of light weight and integration. Lightweight and high-strength metal materials have become a necessary choice for the transformation and upgrading of industrial equipment. Although aluminum alloys and magnesium alloys are lightweight metals, their strength is low, and the specific strength is not satisfactory, which is largely difficult to meet the needs of use. Titanium alloy is an important lightweight metal material developed in the 1950s. It has the advantages of low density (about 60% of steel), high speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02
CPCC22C1/02C22C14/00
Inventor 石晓辉张敏刘丹李洪毅乔珺威
Owner TAIYUAN UNIV OF TECH