CN103436733B - A kind of mountain bike frame high fatigue property titanium alloy - Google Patents
A kind of mountain bike frame high fatigue property titanium alloy Download PDFInfo
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- CN103436733B CN103436733B CN201310419518.4A CN201310419518A CN103436733B CN 103436733 B CN103436733 B CN 103436733B CN 201310419518 A CN201310419518 A CN 201310419518A CN 103436733 B CN103436733 B CN 103436733B
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Abstract
The invention provides a kind of mountain bike frame high fatigue property titanium alloy, be grouped into: Al2.5% ~ 3.5%, V1.0% ~ 2.0%, Fe0.3% ~ 2.0%, Cr0.6% ~ 4.0% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.Titanium alloy of the present invention after heat treatment, at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N and pressure F
2n>=50000 time fatigue lifetime under=600N condition, meet the associated specifications of European standard EN14766-2005.Titanium alloy of the present invention, compared with traditional mountain bike frame titanium alloy, has the advantages such as intensity is high, plasticity good, fatigue property is high, production cost is low, obviously can extend the work-ing life of mountain bike, have broad application prospects.
Description
Technical field
The invention belongs to titanium materials technology field, be specifically related to the high tired titanium alloy of a kind of mountain bike frame.
Background technology
Since mountain bike in 1977 invention, lightweight, high-strength, long lifetime are the targets that numerous mountain bike manufacturer chases always.Density is little, intensity is high because having for titanium alloy, high-low temperature resistant, the many merits, particularly specific tenacity such as corrosion-resistant higher than magnesium, aluminium alloy, be therefore be the researchdevelopment direction of bicycle art, be desirable mountain bike frame material always.
External titanium mountain bike technology of preparing relative maturity at present, many employing Ti-3Al-2.5V titanium alloy pipes prepare mountain bike frame, and its over-all properties is good, but production cost is higher, the vehicle frame wall thickness of preparation is thicker, there is the defects such as product weight is large, cost is high, the life-span is low.
The domestic research about titanium mountain bike is carried out for many years, although also select Ti-3Al-2.5V titanium alloys for frame body, but cannot break through the examination bottleneck of the low Zhou Shuiping fatigue property of lightweight titanium vehicle frame, namely vehicle frame is at horizontal fatigue loading frequency f≤15Hz, tensile force f always
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime N>=50000 time check requirements.
Therefore, need badly and obtain a kind of mountain bike frame high fatigue property titanium alloy, the mountain bike frame utilizing it to prepare is at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N, pressure F
2n>=50000 time fatigue lifetime under=600N condition.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of mountain bike frame high fatigue property titanium alloy.This titanium alloy after heat treatment, at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N and pressure F
2n>=50000 time fatigue lifetime under=600N condition, meet the associated specifications of European standard EN14766-2005.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of mountain bike frame high fatigue property titanium alloy, it is characterized in that, be grouped into by the one-tenth of following mass percent: Al2.5% ~ 3.5%, V1.0% ~ 2.0%, Fe0.3% ~ 2.0%, Cr0.6% ~ 4.0%, surplus is Ti and inevitable impurity; Described mountain bike frame high fatigue property titanium alloy refers to this titanium alloy after heat treatment, at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N and pressure F
2n>=50000 time fatigue lifetime under=600N condition.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al3.0%, V1.7%, Fe0.5%, Cr1.0% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al3.0%, V2.0%, Fe1.0%, Cr2.0% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al3.2%, V1.5%, Fe0.75%, Cr1.5% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al2.8%, V1.3%, Fe1.5%, Cr3.0% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al2.5%, V1.0%, Fe2.0%, Cr4.0% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, is characterized in that, be grouped into: Al3.5%, V2.0%, Fe0.3%, Cr0.6% by the one-tenth of following mass percent, surplus is Ti and inevitable impurity.
Above-mentioned a kind of mountain bike frame high fatigue property titanium alloy, it is characterized in that, in this titanium alloy, the mass ratio of Fe and Cr is 1: 2.
The preparation method of mountain bike frame high fatigue property titanium alloy of the present invention is the customary preparation methods of titanium alloy: select suitable raw material first as required, by design mix mixing electrode pressing, alloy cast ingot is obtained through secondary or three meltings with conventional vacuum consumable electroarc furnace, again alloy cast ingot to be stripped off the skin and after cutting rising head and tail end, at hydrostatic forging machine, the open die forging equipment such as forging hammer carry out cogging forging and make bar with time upsetting pull forging of many fire, then bar is made pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, conventional cold-rolling process is finally adopted by pipe to make mountain bike frame finished product tubing.Namely finished product tubing after heat treatment can be used for making mountain bike frame.
The present invention compared with prior art has the following advantages:
1, titanium alloy intensity of the present invention and plasticity excellent, its temperature-room type plasticity and traditional Ti-3Al-2.5V titanium alloy are suitable, strength ratio Ti-3Al-2.5V titanium alloy height 200MPa ~ 250MPa;
2, titanium alloy of the present invention is by substituting vanadium with cheap chromium metal and iron, reduces the content of precious metal vanadium, thus reduces cost, have more excellent cost performance;
3, after heat treatment, it is at horizontal fatigue loading frequency f≤15Hz, tensile force f for the tubing adopting titanium alloys of the present invention standby
1=1200N, pressure F
2under the condition of=600N, its, N>=50000 time, met the associated specifications of European standard EN14766-2005 fatigue lifetime.
4, adopt the standby mountain bike frame weight of titanium alloys of the present invention to be less than 1.6Kg, there is the remarkable advantages such as lightweight, high-strength, the life-span is long.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Raw material involved by mountain bike frame high fatigue property titanium alloy of the present invention comprises aluminium vanadium master alloy, electrolysis chromium, titanium sponge, aluminium shot, ferric oxide powder etc., and wherein titanium sponge specification is 0 grade or 1 grade.The mass percent of titanium alloy of the present invention consists of: Al2.5% ~ 3.5%, V1.0% ~ 2.0%, Fe0.3% ~ 2.0%, Cr0.6% ~ 4.0%, and surplus is Ti and inevitable impurity; Preferably, in this titanium alloy, the mass ratio of Fe and Cr is 1: 2.In concrete preparation process, first suitable raw material is selected as required, by design mix mixing electrode pressing, alloy cast ingot is obtained through secondary or three meltings in conventional vacuum consumable electroarc furnace, again alloy cast ingot to be stripped off the skin and after cutting rising head and tail end, the open die forging such as hydrostatic forging machine, forging hammer equipment carries out cogging forging and bar is made in time upsetting pull forging of many fire, then bar is made pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, finally adopted by pipe conventional cold-rolling process to make mountain bike frame finished product tubing.Namely finished product tubing can be used for making mountain bike frame after vacuum heat treatment.The Heating temperature of cogging forging is 1050 DEG C ~ 1150 DEG C, and pier pulls out the Heating temperature of forging is repeatedly T
β-50 DEG C ~ T
β-30 DEG C.The temperature of vacuum heat treatment is 700 ~ 750 DEG C, and the time of vacuum heat treatment is 1h ~ 1.5h.Titanium alloy pipe is after heat treatment at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N and pressure F
2n>=50000 time fatigue lifetime under=600N condition, meet the associated specifications of European standard EN14766-2005.
Embodiment 1
The nominal composition of the present embodiment titanium alloy is: Ti-3Al-1.7V-1Cr-0.5Fe, is namely Al3.0%, V1.7%, Fe0.5%, Cr1.0% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-3Al-1.7V-1Cr-0.5Fe, and starting material use Al-55V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot with vacuum consumable electrode arc furnace melting secondary.Control ingot casting impurity element mass content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Alloy cast ingot, after stripping off the skin and excise rising head and tail end, on flat-die forging equipment, forges, at T through 1100 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 105mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 750 DEG C after the vacuum heat treatment of 1.5h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=73000 time, meets the associated specifications of European standard EN14766-2005.
Embodiment 2
The nominal composition of the present embodiment titanium alloy is: Ti-3Al-2V-2Cr-1Fe, is namely Al3.0%, V2.0%, Fe1.0%, Cr2.0% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-3Al-2V-2Cr-1Fe, and starting material use Al-85V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot with vacuum consumable electrode arc furnace melting secondary.Control ingot casting impurity content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Ingot casting, after stripping off the skin and excise rising head and tail end, flat-die forging equipment forges, at T through 1150 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 105mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 700 DEG C after the vacuum heat treatment of 1.5h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=100000 time, meets the associated specifications of European standard EN14766-2005.
Embodiment 3
The nominal composition of the present embodiment titanium alloy is: Ti-3.2Al-1.5V-1.5Cr-0.75Fe, is namely Al3.2%, V1.5%, Fe0.75%, Cr1.5% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-3.2Al-1.5V-1.5Cr-0.75Fe, and starting material use Al-55V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot three times with vacuum consumable electrode arc furnace melting.Control ingot casting impurity content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Ingot casting, after stripping off the skin and excise rising head and tail end, flat-die forging equipment forges, at T through 1100 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 135mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 750 DEG C after the vacuum heat treatment of 1.5h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=78000 time, meets the associated specifications of European standard EN14766-2005.
Embodiment 4
The nominal composition of the present embodiment titanium alloy is: Ti-2.8Al-1.3V-3.0Cr-1.5Fe, is namely Al2.8%, V1.3%, Fe1.5%, Cr3.0% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-2.8Al-1.3V-3.0Cr-1.5Fe, and starting material use Al-60V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot three times with vacuum consumable electrode arc furnace melting.Control ingot casting impurity content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Ingot casting, after stripping off the skin and excise rising head and tail end, flat-die forging equipment forges, at T through 1100 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 95mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 730 DEG C after the vacuum heat treatment of 1.5h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=85000 time, meets the associated specifications of European standard EN14766-2005.
Embodiment 5
The nominal composition of the present embodiment titanium alloy is: Ti-2.5Al-1.0V-1.0Cr-2.0Fe, is namely Al2.5%, V1.0%, Fe2.0%, Cr4.0% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-2.5Al-1.0V-1.0Cr-2.0Fe, and starting material use Al-80V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot three times with vacuum consumable electrode arc furnace melting.Control ingot casting impurity content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Ingot casting, after stripping off the skin and excise rising head and tail end, flat-die forging equipment forges, at T through 1100 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 85mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 700 DEG C after the vacuum heat treatment of 1h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=72000 time, meets the associated specifications of European standard EN14766-2005.
Embodiment 6
The nominal composition of the present embodiment titanium alloy is: Ti-3.5Al-2.0V-0.6Cr-0.3Fe, is namely Al3.5%, V2.0%, Fe0.3%, Cr0.6% by weight percentage, and surplus is Ti and inevitable impurity.
The preparation method of the present embodiment titanium alloy is: prepare burden by nominal composition Ti-3.5Al-2.0V-0.6Cr-0.3Fe, and starting material use Al-50V master alloy, electrolysis chromium, ferric oxide powder and aluminium shot.Electrode pressing after batch mixing, obtains alloy cast ingot three times with vacuum consumable electrode arc furnace melting.Control ingot casting impurity content C≤0.1%, N≤0.03%, H≤0.15%, O≤0.15%.Ingot casting, after stripping off the skin and excise rising head and tail end, flat-die forging equipment forges, at T through 1100 DEG C of coggings
β-50 DEG C ~ T
β-30 DEG C are carried out being forged into Ф 90mm bar after many fire time piers pull out.Bar is prepared into Ф 65mm × 5mm pipe through conventional double-contracting cover hot extrusion or conventional cross piercing, and pipe is conventional cold rolling on cold reducing mill makes mountain bike frame pipe finished.Finished product tubing be can be used for making mountain bike vehicle frame in 720 DEG C after the vacuum heat treatment of 1h.
Finished product tubing after heat treatment, horizontal fatigue tester is tested, at frequency f=2Hz, tensile force f
1=1200N, pressure F
2under the condition of=600N, its fatigue lifetime surveys N=78000 time, meets the associated specifications of European standard EN14766-2005.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (7)
1. a mountain bike frame high fatigue property titanium alloy, is characterized in that, is grouped into: Al2.5% ~ 3.5% by the one-tenth of following mass percent, V1.0% ~ 2.0%, Fe0.3% ~ 2.0%, Cr0.6% ~ 4.0%, surplus is Ti and inevitable impurity; Described mountain bike frame high fatigue property titanium alloy refers to this titanium alloy after heat treatment, at horizontal fatigue loading frequency f≤15Hz, tensile force f
1=1200N and pressure F
2n>=50000 time fatigue lifetime under=600N condition; In this titanium alloy, the mass ratio of Fe and Cr is 1: 2.
2. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al3.0%, V1.7%, Fe0.5%, Cr1.0% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
3. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al3.0%, V2.0%, Fe1.0%, Cr2.0% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
4. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al3.2%, V1.5%, Fe0.75%, Cr1.5% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
5. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al2.8%, V1.3%, Fe1.5%, Cr3.0% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
6. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al2.5%, V1.0%, Fe2.0%, Cr4.0% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
7. a kind of mountain bike frame high fatigue property titanium alloy according to claim 1, is characterized in that, be grouped into: Al3.5%, V2.0%, Fe0.3%, Cr0.6% by the one-tenth of following mass percent, and surplus is Ti and inevitable impurity.
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| CN105018785A (en) * | 2014-08-21 | 2015-11-04 | 太仓钧浩自行车科技有限公司 | Low-brittleness titanium alloy used for bicycle frame and preparing method thereof |
| CN105018788A (en) * | 2014-08-21 | 2015-11-04 | 太仓钧浩自行车科技有限公司 | Titanium alloy for frame of electric bicycle and preparation method thereof |
| CN105018787A (en) * | 2014-08-21 | 2015-11-04 | 太仓钧浩自行车科技有限公司 | Titanium alloy used for foldable bicycle frame and preparation method of titanium alloy |
| CN108929973A (en) * | 2017-05-24 | 2018-12-04 | 江苏天工科技股份有限公司 | A kind of cycle frame titanium alloy |
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| CN102978438A (en) * | 2012-12-14 | 2013-03-20 | 西北有色金属研究院 | Medium/high-strength titanium alloy capable of being cold-rolled and enhanced by heat treatment |
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