CN105088014A - Low-cost and high-strength Ti-Fe alloy billet and preparing technology thereof - Google Patents
Low-cost and high-strength Ti-Fe alloy billet and preparing technology thereof Download PDFInfo
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Abstract
The invention relates to a low-cost and high-strength Ti-Fe alloy billet and belongs to the technical field of metal alloy. The alloy billet is composed of, by weight percentage, 7.0%-12.0% of Fe, 3.0% of Al, 0.01%-0.02% of C and the balance Ti and inevitable impurities. According to the alloy, raw materials of ingot iron, 45 steel machining scrap iron, commercial-purity aluminum and the like are adopted to be mixed, pressed into a block and secondarily smelted through a vacuum suspension smelting furnace into an alloy ingot. The Ti-Fe alloy billet is prepared through the forging and stress relief annealing technology, the tensile strength of the Ti-Fe alloy billet ranges from 1,281 MPa to 1,443 MPa, and the ductility rate ranges from 2.60% to 7.00%. According to the low-cost and high-strength Ti-Fe alloy billet, the raw material cost of the titanium alloy is reduced, the machining section of the alloy is expanded, production is easy, and the strength and plasticity indexes of titanium alloy armors are met.
Description
Technical field
The invention belongs to field of metal alloy technology, being specifically related to a kind of take Ti-Fe as the superhigh intensity titanium alloy of base, its feature is low raw-material cost, there is wider process window, make to choose and widen process window from raw material to realize the reduction of cost, object is to develop the structured material being mainly used in bearing static load, repeated load and shock load.
Background technology
The development of armour material through four-stage, i.e. armor steel, armour aluminum alloy, armoring composite ceramics and armoring titanium alloy.Titanium alloy because having the performances such as the extremely strong and good low-temperature flexibility of high specific strength, solidity to corrosion, and is applicable to armour material.But the cost of titanium alloy is high and complete processing is complicated limits the extensive popularization of titanium alloy at armour material.Therefore, the research carried out about low-cost titanium alloy and technology of preparing thereof is necessary.Reduce material cost and have three kinds of effective ways, namely use cheap alloying element, reduce the tooling cost of material and adopt near-net-shape technology.This research carrys out developing low-cost high strength titanium alloy from using tooling cost two aspects of inexpensive alloy element and reduction material to start with.
As inexpensive alloy element, ferro element is β phase stable element, improves the cold and hot working ability of titanium alloy material.Importantly, iron can be used as the solution strengthening element of titanium alloy, greatly puies forward heavy alloyed intensity.On Germany board automobile LupoFSI, suspension spring titanium alloy T i-1.5Fe-6.8Mo-1.5Al has the characteristics such as Young's modulus is low, intensity is high, but Mo element price costly; Super-TIX51F alloy Ti-5Al-1Fe intensity can reach 1000MPa, but its processing characteristics can not be guaranteed.Therefore, this research mainly exploitation there is with low cost, superstrength, there is the beta titanium alloy of larger cold and hot working potentiality.
Summary of the invention
The object of the present invention is to provide a kind of take Ti-Fe as the low cost of the Al element additional hardening of base, superhigh intensity titanium alloy and suitable heat processing technique, namely find forging and the thermal treatment process of suitable inexpensive alloy composition and optimization, and become the structured material that can bear static load, repeated load and shock load.
Technical scheme: a kind of low cost superstrength Ti-Fe system alloy, it is characterized in that, in alloy, each component and weight percentage thereof are: Fe content is 7.0 ~ 12.0%, Al content is 3.0%, C content is 0.01 ~ 0.02%, and surplus is Ti and inevitable impurity.
Prepare the preparation technology of above-mentioned low cost superelevation strength titanium alloy, it is characterized in that, comprise the following steps:
(1) with titanium sponge, cheap No. 45 steel mechanical workout chips, technically pure iron and commercial-purity aluminiums for starting material, carry out degreasing process, mixing be pressed into alloy block.
(2) to the melting of step (1) gained alloy block, employing equipment is vacuum suspension induction furnace, and smelting temperature is 1700 ~ 1850 DEG C, obtains alloy cast ingot through twice remelting;
(3) forge and stress relief annealing step (2) gained alloy cast ingot, the cogging temperature of forging is 880 ~ 920 DEG C, and finish forge temperature is 820 ~ 850 DEG C, shrend; Stress relief annealing temperature is 500 ~ 550 DEG C, and the time is 0.5 ~ 1h, air cooling.
Advantage of the present invention: compared with conventional titanium alloy, not containing the expensive alloying element such as molybdenum, vanadium in alloy, reduces the material cost of alloy, and finds suitable wider heat processing technique, reduce tooling cost.Prepare the Ti-Fe system alloy with excellent comprehensive mechanical property, be embodied in superstrength and the unit elongation meeting service requirements, tensile strength is 1281 ~ 1443MPa, and unit elongation is 2.60 ~ 7.00%, has broad application prospects at engineering field.
Accompanying drawing explanation
Fig. 1 forges the microhardness value comparison diagram of state Ti-7Fe-3Al-0.02C alloy differing temps, time annealing correspondence.
The mechanical curves of Fig. 2 annealed state Ti-Fe system.
Fig. 3 forges the microhardness value comparison diagram of state Ti-10Fe-3Al-0.02C alloy differing temps, time annealing correspondence.
Fig. 4 forges the microhardness value comparison diagram of state Ti-12Fe-3Al-0.02C alloy differing temps, time annealing correspondence.
Embodiment
Be described in further details below in conjunction with embodiment, but the present invention is not limited to following examples.
Low cost high strength titanium alloy: this weight alloy per-cent consists of: Fe content is 7.0 ~ 12.0%, Al content is 3.0%, and C content is 0.01 ~ 0.02%, surplus is Ti and inevitable impurity.
The preparation of low cost Ti-Fe-Al-C titanium alloy: starting material be 0 grade of titanium sponge, 99.3% technically pure iron, the commercial-purity aluminium of 99.5%, industrial 45 carbon steel mechanical workout iron filings, carry out degreasing process, mix by composition proportion ingredient, and on pressing machine briquetting.Briquetting melting on 5KG vacuum suspension induction furnace, smelting temperature is 1700 DEG C ~ 1850 DEG C, carries out twice remelting and obtains titan alloy casting ingot, by ingot casting descaling, tail of decaptitating, through cogging forging, is finally forged into bar, sheet material.Cogging Heating temperature is between 880 DEG C ~ 920 DEG C, and final finish forge temperature is between 820 DEG C ~ 850 DEG C.
Embodiment 1
By nominal composition Ti-7Fe-3Al-0.02C (weight percent, %) alloyage raw material, starting material use 0 grade of titanium sponge, 99.3% technically pure iron, the commercial-purity aluminium of 99.5%, industrial 45 steel mechanical workout iron filings, carry out degreasing process.After batch mixing on 200 t hydraulic press briquetting, obtain alloy cast ingot twice with the induction furnace melting of 5KG vacuum suspension, ingot casting through strip off the skin process after, smear glass protecting lubricant, prevent High Temperature Oxidation.920 DEG C of cogging forgings, at 850 DEG C, carry out many fire time piers subsequently pull out with thinning microstructure, be finally swaged into the bar of φ 12mm, Water Quenching.Forging state Alloy At Room Temperature mechanical property: tensile strength is 1380MPa, and unit elongation is 2.8%.(as subordinate list 1 illustrates)
By the stress relief annealing technique of optimized alloy, after being annealed by differing temps, time, alloy rigidity value can search out the stress relief annealing technique of its best is 550 DEG C/1h/AC (accompanying drawing 1 illustrates), under this annealing process, obtain the room-temperature mechanical property of bar-shaped blank: tensile strength 1371MPa, unit elongation is 2.6%.(as accompanying drawing 2 illustrates)
Embodiment 2
By nominal composition Ti-10Fe-3Al-0.02C (weight percent, %) alloyage raw material, starting material use 0 grade of titanium sponge, 99.3% technically pure iron, the commercial-purity aluminium of 99.5%, industrial 45 steel mechanical workout iron filings, carry out degreasing process.After batch mixing on 200 t hydraulic press briquetting, obtain alloy cast ingot twice with the induction furnace melting of 5KG vacuum suspension, ingot casting through strip off the skin process after, smear glass protecting lubricant, prevent High Temperature Oxidation.880 DEG C of cogging forgings, at 820 DEG C, carry out many fire time piers subsequently pull out with thinning microstructure, be finally swaged into the bar of φ 12mm, Water Quenching.Forging state Alloy At Room Temperature mechanical property: tensile strength is 1281MPa, and unit elongation is 5.36%.(as subordinate list 1 illustrates)
By the stress relief annealing technique of optimized alloy, after differing temps, time annealing, alloy rigidity value can search out the stress relief annealing technique of its best is 550 DEG C/1h/AC (accompanying drawing 3 illustrates), obtain the room-temperature mechanical property of bar-shaped blank: tensile strength 1429MPa, unit elongation is 4.00%.(as accompanying drawing 1 illustrates)
Embodiment 3
By nominal composition Ti-12Fe-3Al-0.02C (weight percent, %) alloyage raw material, starting material use 0 grade of titanium sponge, 99.3% technically pure iron, the commercial-purity aluminium of 99.5%, industrial 45 steel mechanical workout iron filings, carry out degreasing process.After batch mixing on 200 t hydraulic press briquetting, obtain alloy cast ingot twice with the induction furnace melting of 5KG vacuum suspension, ingot casting through strip off the skin process after, smear glass protecting lubricant, prevent High Temperature Oxidation.880 DEG C of cogging forgings, at 820 DEG C, carry out many fire time piers subsequently pull out with thinning microstructure, be finally swaged into the bar of φ 12mm, Water Quenching.Forging state Alloy At Room Temperature mechanical property: tensile strength is 1385MPa, and unit elongation is 8.92%.(as subordinate list 1 illustrates)
By the stress relief annealing technique of optimized alloy, after differing temps, time annealing, alloy rigidity value searches out the stress relief annealing technique of its best is 500 DEG C/0.5h/AC (accompanying drawing 4 illustrates), obtain the room-temperature mechanical property of bar-shaped blank: tensile strength 1443MPa, unit elongation is 7.00%.(as accompanying drawing 1 illustrates)
The mechanical property parameters of state Ti-Fe system alloy forged by table 1
| Nominal composition | Tensile strength/MPa | Unit elongation/% |
| Ti-7Fe-3Al-0.02C | 1380 | 2.80 |
| Ti-10Fe-3Al-0.02C | 1281 | 5.36 |
| Ti-12Fe-3Al-0.02C | 1385 | 8.92 |
Claims (6)
1. a low cost superstrength Ti-Fe system alloy, is characterized in that, in alloy, each component and weight percentage thereof are: Fe content is 7.0 ~ 12.0%, Al content is 3.0%, and C content is 0.01 ~ 0.02%, and surplus is Ti and inevitable impurity.
2. a kind of low cost superstrength Ti-Fe system according to claim 1 alloy, it is characterized in that, in alloy, each component and weight percentage thereof are: Fe content is 7.0%, Al content is 3.0%, C content is 0.01 ~ 0.02%, and surplus is Ti and inevitable impurity.
3. a kind of low cost superstrength Ti-Fe system according to claim 1 alloy, it is characterized in that, in alloy, each component and weight percentage thereof are:: Fe content is 10.0%, Al content is 3.0%, C content is 0.01 ~ 0.02%, and surplus is Ti and inevitable impurity.
4. a kind of low cost superstrength Ti-Fe system according to claim 1 alloy, it is characterized in that, in alloy, each component and weight percentage thereof are: Fe content is 12.0%, Al content is 3.0%, C content is 0.01 ~ 0.02%, and surplus is Ti and inevitable impurity.
5. prepare the method for low cost superstrength Ti-Fe system according to claim 1 alloy, it is characterized in that, (1) with titanium sponge, cheap No. 45 steel mechanical workout chips, technically pure iron and commercial-purity aluminiums for starting material, carry out degreasing process, mixing be pressed into alloy block;
(2) to the melting of step (1) gained alloy block, employing equipment is vacuum suspension induction furnace, and smelting temperature is 1700 ~ 1850 DEG C, obtains alloy cast ingot through twice remelting;
(3) forge and stress relief annealing step (2) gained alloy cast ingot, the cogging temperature of forging is 880 ~ 920 DEG C, and finish forge temperature is 820 ~ 850 DEG C, shrend; Stress relief annealing temperature is 500 ~ 550 DEG C, and the time is 0.5 ~ 1h, air cooling.
6. method according to claim 5, is characterized in that, the tensile strength of forging rear annealing state alloy is 1281 ~ 1443MPa, and unit elongation is 2.60 ~ 7.00%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779820A (en) * | 2016-03-25 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for low-impurity-content ferrotitanium |
| CN108023303A (en) * | 2017-12-05 | 2018-05-11 | 国网河南省电力公司检修公司 | A kind of great tonnage hydraulic cord holder |
| CN109554567A (en) * | 2018-12-20 | 2019-04-02 | 广东省材料与加工研究所 | A kind of Ti-Fe alloy based composites and preparation method thereof |
| CN114672694A (en) * | 2022-03-30 | 2022-06-28 | 北京工业大学 | Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy |
| US11839782B2 (en) | 2018-12-19 | 2023-12-12 | Scania Cv Ab | Safety method and control device for an emergency vehicle |
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| JP2010007166A (en) * | 2008-06-30 | 2010-01-14 | Daido Steel Co Ltd | alpha+beta TYPE TITANIUM ALLOY FOR CASTING, AND GOLF CLUB HEAD USING THE SAME |
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| CN103667788A (en) * | 2012-09-14 | 2014-03-26 | 北京工业大学 | Titanium alloy and thermal treatment process |
| CN104818408A (en) * | 2015-05-20 | 2015-08-05 | 南京工业大学 | High-strength Ti-Al-Fe-Si alloy and preparation method thereof |
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| JPS5171206A (en) * | 1974-12-18 | 1976-06-19 | Sumitomo Electric Industries | KOKYODOCHITANSHOKETSUGOKIN NO SEIZOHO |
| JP2010007166A (en) * | 2008-06-30 | 2010-01-14 | Daido Steel Co Ltd | alpha+beta TYPE TITANIUM ALLOY FOR CASTING, AND GOLF CLUB HEAD USING THE SAME |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105779820A (en) * | 2016-03-25 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for low-impurity-content ferrotitanium |
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| CN108023303A (en) * | 2017-12-05 | 2018-05-11 | 国网河南省电力公司检修公司 | A kind of great tonnage hydraulic cord holder |
| US11839782B2 (en) | 2018-12-19 | 2023-12-12 | Scania Cv Ab | Safety method and control device for an emergency vehicle |
| CN109554567A (en) * | 2018-12-20 | 2019-04-02 | 广东省材料与加工研究所 | A kind of Ti-Fe alloy based composites and preparation method thereof |
| CN114672694A (en) * | 2022-03-30 | 2022-06-28 | 北京工业大学 | Low-temperature rolling and heat treatment process of near-alpha type high-temperature titanium alloy |
| CN114672694B (en) * | 2022-03-30 | 2022-08-16 | 北京工业大学 | Preparation method of near-alpha type high-temperature titanium alloy |
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