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Low-cost beta-close titanium alloy

A β-titanium alloy, low-cost technology, applied in the field of alloy materials, can solve problems such as increasing costs, and achieve good cold working performance

Active Publication Date: 2015-03-11
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Another example is an invention patent with the authorized publication number CN1962913A and the invention title "A Low-Cost Titanium Alloy with Adjustable Performance". Eight elements such as Al, Fe, Cr, Ni, S, B, C, and Mo are added to titanium. , wherein the alloy composition is calculated by weight fraction: Al: 0-3.5%, Fe: 0.3-2.0%, Cr: 0.1-0.5%, the adjustable range of alloy mechanical properties is: tensile strength is 350MPa-1250MPa, elongation is 5 %-30%, and the reduction of area is 10%-55%; but the alloy contains Ni and Mo with higher prices, which increases the cost of the alloy to a certain extent

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] The commercially available sponge titanium, aluminum beans, and ferrochrome master alloy are pressed into the electrode according to the main component ratio in Table 4 and welded into a vacuum consumable electrode, and then subjected to secondary vacuum consumable melting to obtain an ingot, and the metallographic method is used to measure The phase transition point is 870±5°C. The calculated K of the alloy β The value is 1.102. The ingot is forged above the phase transformation point, and rolled into a φ12mm bar. Sampling the rods for heat treatment, according to the requirements of GB / T228-2002 for room temperature mechanical properties test, the properties are shown in Table 5.

[0028] Table 4 The proportioning composition of the alloy in Example 1

[0029]

[0030] Table 5 Mechanical properties of rods in Example 1

[0031]

Embodiment 2

[0033] Commercially available sponge titanium, aluminum beans, chromium-iron master alloys, and Fe elemental substances were pressed into electrodes according to the main component ratio in Table 6 and welded into vacuum consumable electrodes, and then subjected to secondary vacuum consumable smelting to obtain ingots. The phase transition point measured by metallographic method is 840±5°C. The calculated K of the alloy β The value is 1.228. The ingot is forged above the phase transformation point, and rolled into a φ12mm bar. Sampling the rods for heat treatment, and testing the mechanical properties at room temperature according to the requirements of GB / T228-2002. The properties are shown in Table 7.

[0034] The proportioning composition of the alloy in the table 6 embodiment 2

[0035]

[0036] The mechanical property of bar in the table 7 embodiment 2

[0037]

Embodiment 3

[0039] Commercially available sponge titanium, aluminum beans, and ferrochrome master alloys are pressed into electrodes according to the main component ratio in Table 8 and welded into vacuum consumable electrodes, and then subjected to secondary vacuum consumable smelting to obtain ingots, measured by metallographic method The phase transition point is 860±5°C. The calculated K of the alloy β The value is 1.044. The ingot is forged above the phase transformation point, and rolled into a φ12mm bar. Sampling the rods for heat treatment, and performing mechanical property tests at room temperature according to the requirements of GB / T228-2002. The properties are shown in Table 9.

[0040] The proportioning composition of the alloy in the table 8 embodiment 3

[0041]

[0042] The mechanical property of bar in the table 9 embodiment 3

[0043]

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Abstract

The invention relates to low-cost beta-close titanium alloy which comprises, by weight, 0-3% of aluminum (Al), 4.1-5.5% of chromium (Cr), 2-3% of ferrum (Fe), 0-0.30% of boron (B), and the balance titanium, wherein a ratio of Cr to Fe is 1.6-2.3. The range of a Kbeta value of the titanium alloy is 1.0-1.4. The Kbeta computational formula is as follows: Kbeta= C1 / CK1+C2 / CK2+C3 / CK3+...+Cn / CKn, wherein Cn is a weight percentage of an alloying element in the alloy, and Ck is critical weight percent concentration of a frequently-used beta stable element. The cost of raw materials of the alloy is lower than that of raw materials of prior titanium alloy and is three fourths that of frequently-used titanium alloy Ti-6Al-4V, and the basic mechanical property of the titanium alloy equals to that of the Ti-6Al-4V.

Description

technical field [0001] The invention relates to a low-cost near-beta titanium alloy, which belongs to the technical field of alloy materials. Background technique [0002] β titanium alloy has high specific strength and specific stiffness, and large cross-section titanium alloy parts have excellent strength toughness and fatigue performance, low forging temperature, good cold forming performance and other advantages in aviation, aerospace, ships, weapons and chemical industry Widely used in industry and other fields. β-titanium alloys are a class of titanium alloys that contain sufficient amounts of β-stabilizing elements to inhibit the martensitic transformation of the alloy during quenching to room temperature. Common β-stabilizing elements include V, Mo, Nb, Zr, Sn, Fe, Cr, Pd, and Ta, etc. Among them, the cost of alloying elements such as Mo, V, Pd, Ta, Nb, Zr, and Sn is very high, so that The material cost of β-titanium alloy remains high. The ratio of yield limit to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03
Inventor 于洋惠松骁叶文君王国刘睿付艳艳宋晓云
Owner GRIMAT ENG INST CO LTD
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