CN103045905A - Low-cost titanium alloy and preparation method thereof - Google Patents
Low-cost titanium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to low-cost titanium alloy and a preparation method thereof. The alloy comprises the following components by weight: 0-3% of Al, 1.6-4% of Cr, 1-2% of Fe, 0.01-0.13% of Si, 0-0.1% of B, and the balance of titanium, wherein Cr/Fe is 1.6-2.0, the range of the Kbeta value of the titanium alloy is 0.5-0.95; the calculation formula of the Kbeta is as follows: Kbeta=C1/CK1+C2/CK2+C3/CK3+...+Cn/CKn, wherein Cn is the weight content % of the alloy element in the alloy, and CK is the critical concentration (wt%) of a common beta stable element. Titanium sponge, ferrochrome intermediate alloy, elementary substance boron, iron elementary substance and/or aluminium shot are distributed by layer and compacted into electrodes according to the alloy components, and a cast ingot is obtained by secondary melting in a vacuum consumable melting furnace. The alloy of the invention has low raw material cost, and comparable basic mechanical properties to Ti-6Al-4V.
Description
Technical field
The present invention relates to a kind of low-cost titanium alloy and preparation method thereof, belong to field of alloy material.
Background technology
Titanium or titanium alloy has a series of advantages such as specific tenacity height, excellent anti-corrosion performance, environmentally safe, make it be widely used in the fields such as Aeronautics and Astronautics, naval vessel, weapons and chemical industry, and cause very early people's attention as Vehicle Materials.Commercial titanium alloy interalloy element uses the noble elements such as V, Mo, Nb, Zr, Sn and Ta more at present, makes the manufacturing cost of titanium alloy and use cost high, has affected applying of titanium alloy.
The present approach that reduces titanium alloy manufacturing cost and use cost has: the whole bag of tricks such as processing technology that reduce raw-material cost, the cheap alloy element of employing, the complete processing of simplifying titanium alloy, optimization Ti product by the mode of production of improving starting material (titanium sponge).The characteristics that wherein adopt cheap alloy element are to have adopted the Mo-Fe alloy with respect to Al-V alloy cheapness to reach the purpose that reduces material cost as master alloy, yet Mo remains noble element, and cost is limited; Adopt the resourceful elements such as Fe, Al, Si, Cr, N, C and B can reach decrease titanium alloy cost.Cr, Fe are eutectoid type beta stable element, have eutectoid transformation in Ti alloy, Ti-Al alloy, may generate Compound Phase when content is higher, cause fragility, therefore should consider aspect alloying element selection and the add-on.
At present, the correlative study about cheap alloy element aspect comprises:
Granted publication number is CN 101348876B, denomination of invention is the Chinese invention patent of " a kind of low cost high strength titanium alloy ", its technical scheme is for adopting Al-V or Fe-V master alloy, electrolysis chromium, pure titanium or titanium alloy car bits, industrial iron and titanium sponge to press design mix mixing electrode pressing, cast alloy pig with conventional vacuum consumable electrode arc furnace secondary smelting, the weight percent of alloying constituent consists of: Al:4%-6%, V:1.9%-2.9%, Cr:1%-3%, Fe:1%-3%, surplus is Ti and inevitable impurity.Tensile property after the alloy thermal treatment is: tensile strength is 1000MPa-1358MPa, and yield strength is 930MPa-1270MPa, and unit elongation is 9%-18%, and relative reduction in area is 20%-50%.This alloy is compared cost with Ti-6Al-4V, but still contains Al-V or Fe-V master alloy in the alloy, and the adding form of chromium and iron is electrolysis chromium and industrial iron.
Granted publication number is CN101403058B, denomination of invention is the Chinese invention patent of " a kind of low cost alpha and beta type titan alloy ", disclosed titanium alloy component by weight percentage ratio is counted: Al:4.5-8%, Cr:0.3-3%, Fe:0.3-2%, and all the other are Ti and inevitable impurity; Also can contain Mo:0-3%, Sn:0-3% or Zr:0-3% in the alloy; Wherein Cr adds with the form of aluminium chromium hardener, and Fe adds with the form of ferro-aluminum master alloy.This alloy cold rolled sheet (0.8mm) is along rolling to sampling, and room-temperature mechanical property is: tensile strength 870-1000MPa, yield strength 780-900MPa, elongation 16-31%; 0.8-2mm the room-temperature property of thick Ti-6Al-4V sheet material is tensile strength 925MPa, yield strength 870MPa, elongation＞10%; Its room-temperature mechanical property and Ti-6Al-4V are suitable.
And for example publication number is CN1962913A, denomination of invention is the Chinese invention patent of " a kind of low-cost titanium alloy of performance-adjustable ", in titanium, add eight kinds of elements such as Al, Fe, Cr, Ni, S, B, C, Mo, alloying constituent mark meter: Al:0-3.5% by weight wherein, Fe:0.3-2.0%, Cr:0.1-0.5%, the alloy mechanical property variable range is: tensile strength is 350MPa-1250MPa, unit elongation is 5%-30%, and relative reduction in area is 10%-55%; But contain price higher metal Ni and Mo in the alloy, improved to a certain extent the cost of alloy.
Summary of the invention
The objective of the invention is to adopt cheap Cr-Fe alloy or fe is starting point as master alloy, and a kind of low-cost titanium alloy and preparation method thereof is provided.
To achieve these goals, the present invention is by the following technical solutions:
A kind of low-cost titanium alloy, alloying constituent are Al:0～3% by weight percentage, Cr:1.6～4%, and Fe:1～2%, Si:0.01～0.13%, B:0～0.1%, surplus is titanium, wherein Cr/Fe is 1.6～2.0, the K of described titanium alloy
βThe value scope is 0.5～0.95, K
βCalculation formula is as follows:
K
β＝C
1/C
K1+C
2/C
K2+C
3/C
K3+…+C
n/C
Kn
C wherein
nBe the content (wt%) of alloying element in alloy, C
kThreshold concentration (wt%) for beta stable element commonly used: Mo is that 10, Mn is that 6.4, Fe is that 5, Nb is that 36, V is that 15, Ta is that 40, Cr is that 7, Co is that 7, Cu is that 13, Ni is that 9, W is 22.
In the low-cost titanium alloy of the present invention, the content of impurity element is not higher than 0.30% (% by weight).
The preparation method of above-mentioned low-cost titanium alloy, may further comprise the steps: with titanium sponge, ferrochrome master alloy, pure boron, iron simple substance and/or aluminium shot, by above-mentioned design mix layer-by-layer distribution electrode pressing, obtain ingot casting with conventional vacuum consumable smelting stove secondary smelting.
Among the present invention, the cost of material cost and titanium sponge is suitable, and described alloy raw material cost is 3/4～4/5 of Ti-6Al-4V alloy, and room-temperature mechanical property and Ti-6Al-4V after the annealing are suitable, and the performance of Ti-6Al-4V alloy is as shown in table 1.The cost of master alloy is as shown in table 2, and the cost of Cr-Fe master alloy is lower than the cost of the master alloys such as Mo-Fe, Al-V, and commercially available little carbon Cr-Fe master alloy composition is as shown in table 3.
The basic mechanical performance of table 1, Ti-6Al-4V alloy
Table 2 master alloy cost
The commercially available little carbon Cr-Fe master alloy composition of table 3
Fe is as the beta stable element of titanium alloy, and it is cheap, and Fe joins in the Beta titanium alloy, can accelerate its timeliness response speed, and it is also shorter to reach aging strength peak value required time; The content of Fe forms " iron speck " easily greater than 4%, and the performance of alloy has detrimentally affect.Cr and mutually all dissolvings of α, β, and have eutectoid reaction.Cr mainly plays solution strengthening effect, can put forward heavy alloyed plasticity, toughness and hardening capacity.The Cr element can also the refinement alloy as-cast microstructure, compare with Mo, the thinning effect of Cr element is apparent in view, strengthening effect also is better than the Mo element.And add effectively refined cast structure and hinder in the following process process growing up of crystal grain thinning of B element in titanium alloy, thereby it is inferior to reduce the distortion fire, the purpose that cuts down finished cost.
Alloy of the present invention can obtain relevant basic mechanical performance by following technique, and alloy cast ingot is forged into excellent base 1000～1100 ℃ of coggings.The rod base heats in 20～100 ℃ of scopes more than transformation temperature, then adopts rolling or forging forming method is made Φ 12mm bar.After heat treatment just can obtain corresponding mechanical property.
Advantage of the present invention is: the material cost of alloy is lower than the material cost of existing titanium alloy, be about 3/4ths of Titanium alloy Ti-6Al-4V commonly used, and basic mechanical performance is suitable with Ti-6Al-4V.
The present invention will be further described below by embodiment, but and do not mean that limiting the scope of the invention.
Embodiment
Embodiment 1
Commercially available titanium sponge, aluminium shot, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 4 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 935 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 5.
The formulated component of table 4 embodiment 1 interalloy
The mechanical property of bar among table 5 embodiment 1
Embodiment 2
Commercially available titanium sponge, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 6 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 875 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 7.
The formulated component of table 6 embodiment 2 interalloies
The mechanical property of bar among table 7 embodiment 2
Embodiment 3
Commercially available titanium sponge, aluminium shot, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 8 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 885 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 9.
The formulated component of table 8 embodiment 3 interalloies
The mechanical property of bar among table 9 embodiment 3
Embodiment 4
With commercially available titanium sponge, aluminium shot, ferrochrome master alloy, pure boron and iron simple substance by the principal constituent proportioning electrode pressing in the table 10 and be welded into vacuum consumable electrode, then carry out the secondary vacuum consumable smelting and obtain ingot casting, recording transformation temperature with metallographic method is 885 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 11.
The formulated component of table 10 embodiment 4 interalloies
The mechanical property of bar among table 11 embodiment 4
Embodiment 5
Commercially available titanium sponge, aluminium shot, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 8 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 880 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 13.
The formulated component of table 12 embodiment 5 interalloies
The mechanical property of bar among table 13 embodiment 5
Embodiment 6
Commercially available titanium sponge, aluminium shot, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 8 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 900 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 15.
The formulated component of table 14 embodiment 6 interalloies
The mechanical property of bar among table 15 embodiment 6
Embodiment 7
Commercially available titanium sponge, aluminium shot, ferrochrome master alloy and iron simple substance by the principal constituent proportioning electrode pressing in the table 8 and be welded into vacuum consumable electrode, are then carried out the secondary vacuum consumable smelting and obtain ingot casting, and recording transformation temperature with metallographic method is 900 ± 5 ℃.Ingot casting forges in the above cogging of transformation temperature, and through making the bar of Φ 12mm after rolling.Sampling is heat-treated to bar, carries out the room-temperature mechanical property test by the requirement of GB/T228-2002, and performance is shown in Table 17.
The formulated component of table 16 embodiment 7 interalloies
The mechanical property of bar among table 17 embodiment 7
Claims (3)
1. low-cost titanium alloy, alloying constituent is Al:0～3% by weight percentage, Cr:1.6～4%, Fe:1～2%, Si:0.01～0.13%, B:0～0.1%, surplus is titanium, wherein Cr/Fe is 1.6～2.0, the K of described titanium alloy
βThe value scope is 0.5～0.95, K
βCalculation formula is as follows:
K
β＝C
1/C
K1+C
2/C
K2+C
3/C
K3+…+C
n/C
Kn
C wherein
nBe the weight content % of alloying element in alloy, C
kBe the threshold concentration of beta stable element commonly used, wt%.
2. low-cost titanium alloy according to claim 1, it is characterized in that: the weight that contains impurity element in the described alloy is not higher than 0.30%.
3. the preparation method of claim 1 or 2 described low-cost titanium alloys, may further comprise the steps: with titanium sponge, ferrochrome master alloy, pure boron, iron simple substance and/or aluminium shot, by described alloying constituent layer-by-layer distribution electrode pressing, obtain ingot casting with vacuum consumable smelting stove secondary smelting.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105400993A (en) * | 2015-12-22 | 2016-03-16 | 北京有色金属研究总院 | High-speed-impact-resistant and low-cost titanium alloy |
| CN105624466A (en) * | 2016-01-26 | 2016-06-01 | 安徽同盛环件股份有限公司 | Thin-wall titanium alloy ring piece and forging molding method thereof |
| CN105714150A (en) * | 2016-03-08 | 2016-06-29 | 上海大学 | Low-cost titanium alloy containing Fe and Mn elements |
| CN117324525A (en) * | 2023-12-01 | 2024-01-02 | 苏州森锋医疗器械有限公司 | Intramedullary nail and preparation method thereof |
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| JP2005320570A (en) * | 2004-05-07 | 2005-11-17 | Kobe Steel Ltd | alpha-beta TITANIUM ALLOY WITH EXCELLENT MACHINABILITY |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105400993A (en) * | 2015-12-22 | 2016-03-16 | 北京有色金属研究总院 | High-speed-impact-resistant and low-cost titanium alloy |
| CN105400993B (en) * | 2015-12-22 | 2017-08-25 | 北京有色金属研究总院 | A kind of low-cost titanium alloy of resistance to high speed impact |
| CN105624466A (en) * | 2016-01-26 | 2016-06-01 | 安徽同盛环件股份有限公司 | Thin-wall titanium alloy ring piece and forging molding method thereof |
| CN105714150A (en) * | 2016-03-08 | 2016-06-29 | 上海大学 | Low-cost titanium alloy containing Fe and Mn elements |
| CN117324525A (en) * | 2023-12-01 | 2024-01-02 | 苏州森锋医疗器械有限公司 | Intramedullary nail and preparation method thereof |
| CN117324525B (en) * | 2023-12-01 | 2024-02-13 | 苏州森锋医疗器械有限公司 | Intramedullary nail and preparation method thereof |
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Effective date of registration: 20190628 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: No. 2, Xinjie street, Xicheng District, Beijing, Beijing Patentee before: General Research Institute for Nonferrous Metals |