CN107779665B - A kind of titanium alloy and its processing method - Google Patents
A kind of titanium alloy and its processing method Download PDFInfo
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- CN107779665B CN107779665B CN201610712535.0A CN201610712535A CN107779665B CN 107779665 B CN107779665 B CN 107779665B CN 201610712535 A CN201610712535 A CN 201610712535A CN 107779665 B CN107779665 B CN 107779665B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
The present invention provides a kind of titanium alloy and its processing methods, wherein 1)~6 the method for machining titanium alloy includes the following steps): 1) titanium alloy processed will be needed to be heated to Tβ+ 55~Tβ+ 65 DEG C, then heat preservation is forged, cooling；2) titanium alloy obtained by step 1) is heated to Tβ- 35~Tβ- 25 DEG C, then heat preservation is forged, cooling；3) titanium alloy obtained by step 2) is heated to Tβ+ 15~Tβ+ 25 DEG C, then heat preservation is forged, cooling；4) titanium alloy obtained by step 3) is heated to Tβ- 75~Tβ- 65 DEG C, then heat preservation is forged, cooling；5) titanium alloy obtained by step 4) is heated to Tβ- 120~Tβ- 90 DEG C, then heat preservation is forged, cooling；6) titanium alloy obtained by step 5) is heated to Tβ- 350~TβIt -300 DEG C, keeps the temperature, it is cooling.Titanium alloy using this method processing has improved mechanical property, especially room temperature elongation percentage.
Description
Technical field
The invention belongs to titanium alloy fields, and in particular to a kind of titanium alloy and its processing method.
Background technique
Titanium or titanium alloy be widely used in because having many advantages, such as that high specific strength, corrosion resistance are good Aeronautics and Astronautics, weapons,
The industrial circles such as automobile.Up to the present, up to tens kinds of the titanium alloy succeeded in developing both at home and abroad, wherein most widely used
General is a kind of alpha and beta titanium alloy, Ti-6Al-4V alloy.
In all titanium alloy application fields such as aviation, automobile, the energy, naval vessel, chemical industry, medical instrument and sports goods,
The specific gravity of Ti-6Al-4V alloy accounts for 50% or more.Due to containing 4% (weight percent, similarly hereinafter) in Ti-6Al-4V alloy
Expensive V element, cause the production cost of Ti-6Al-4V alloy higher.
Chinese patent CN 102212716A discloses a kind of novel alpha and beta titanium alloy, is added in the alloying component honest and clean
The elements such as Mo, Zr, Fe, Cr of valence are free of expensive V element, and mechanical property is suitable with Ti-6Al-4V alloy, but have
There is higher price-performance ratio.
Summary of the invention
The more higher easier part for being processed to shape complexity of alloy plasticity, cold plasticity is better, and processing cost is also more
It is low, using also more extensive.
Inventors have found that structure is complicated for the titanium alloy component of many aviation fields, such as hollow fan blade for aircraft engine
Deng, it is often necessary to it is processed using the method for superplastic forming.
Inventor can significantly improve this it has furthermore been found that process a kind of specific titanium alloy by a kind of specific method
Improve the plasticity of titanium alloy, especially temperature-room type plasticity, especially room temperature elongation percentage.
It is an object of the present invention to provide a kind of methods of machining titanium alloy.It is also another object of the present invention to provide
A kind of processing method can be improved titanium alloy plasticity.It is also another object of the present invention to provide a kind of titanium alloys.The present invention is again
One purpose is to provide a kind of titanium alloy that temperature-room type plasticity is good.
First aspect present invention provides a kind of titanium alloy, and the composition of the titanium alloy contains by weight:
Al:3%~3.7% (such as 3.5%)；
Mo:2.5%~4% (such as 2.5%, 3% or 3.5%)；
Zr:2%~4% (such as 3%)；
Si:0%~0.35% (such as 0.08%, 0.1%, 0.15% or 0.25%)；
M:M is Cr and/or Fe, if M is Cr, the content of Cr is 2.3%~3.3% (such as 2.5% or 3%), if
M is Fe, and the content of Fe is 0.4%~1.2% (such as 0.6%, 0.8% or 1.0%), if M is made of Cr and Fe, Cr and
Fe total content is 0.4%~3.3% (mass ratio of such as 1.0% or 2.5%, Cr and Fe are preferably 0.01~100)；
Impurity element total amount≤0.4%, surplus Ti；
The room temperature elongation percentage of the titanium alloy is 30~70%, preferably 30~60%, further preferably 40~60%, further preferably
50~60%；
Preferably, the yield strength Rp of the titanium alloy0.2For 875~950MPa, preferably 880~920MPa；
Preferably, the tensile strength Rm of the titanium alloy is 960~1100MPa, preferably 965~995MPa.
In one embodiment, the titanium alloy of any one of present invention, the titanium alloy have following one or more spies
Sign:
A) content of Si is 0%~0.1%；
If b) M is Cr, the content of Cr is 2.3%~3%,
If c) M is Fe, the content of Fe is 1%~1.2%,
If d) M is made of Cr and Fe, Cr and Fe total content is 1%~3%.
In one embodiment, the titanium alloy of any one of present invention, the impurity element include selected from following element
It is one or more: C, O, N, H；
Preferably, in the impurity element, if so, C≤0.04%, O≤0.15%, N≤0.04%, H≤
0.015%.
Second aspect of the present invention provides a kind of method of machining titanium alloy comprising following steps 1)~6):
1) titanium alloy processed will be needed to be heated to Tβ+ 50~Tβ+ 70 DEG C, then heat preservation is forged, cooling；
2) titanium alloy obtained by step 1) is heated to Tβ- 40~Tβ- 20 DEG C, then heat preservation is forged, cooling；
3) titanium alloy obtained by step 2) is heated to Tβ+ 10~Tβ+ 30 DEG C, then heat preservation is forged, cooling；
4) titanium alloy obtained by step 3) is heated to Tβ- 80~Tβ- 60 DEG C, then heat preservation is forged, cooling；
5) titanium alloy obtained by step 4) is heated to Tβ- 130~Tβ- 80 DEG C, then heat preservation is forged, cooling.
6) titanium alloy obtained by step 5) is heated to Tβ- 350 DEG C~TβIt -300 DEG C, keeps the temperature, it is cooling.
In one embodiment, the method for the machining titanium alloy of any one of present invention, with following one or more
Feature:
E) wherein step 1) will need the titanium alloy processed to be heated to Tβ+ 55~Tβ+ 65 DEG C, then heat preservation is forged, cold
But；
Titanium alloy obtained by step 1) is heated to T by f) wherein step 2)β- 35~Tβ- 25 DEG C, then heat preservation is forged, cold
But；
Titanium alloy obtained by step 2) is heated to T by g) wherein step 3)β+ 15~Tβ+ 25 DEG C, then heat preservation is forged, cold
But；
Titanium alloy obtained by step 3) is heated to T by h) wherein step 4)β- 75~Tβ- 65 DEG C, then heat preservation is forged, cold
But；
Titanium alloy obtained by step 4) is heated to T by i) wherein step 5)β- 120~Tβ- 90 DEG C, then heat preservation is forged, cold
But；
Titanium alloy obtained by step 5) is heated to T by j) wherein step 6)β- 340~TβIt -310 DEG C, keeps the temperature, it is cooling.
In one embodiment, the method for the machining titanium alloy of any one of present invention, with following one or more
Feature:
K) wherein step 1) will need the titanium alloy processed to be heated to Tβ+ 60 DEG C, then heat preservation is forged, cooling；
L) wherein step 2) includes: that titanium alloy obtained by step 1) is heated to Tβ- 30 DEG C, then heat preservation is forged, cooling；
M) wherein step 3) includes: that titanium alloy obtained by step 2) is heated to Tβ+ 20 DEG C, then heat preservation is forged, cooling；
N) wherein step 4) includes: that titanium alloy obtained by step 3) is heated to Tβ- 70 DEG C, then heat preservation is forged, cooling；
O) wherein step 5) includes: that titanium alloy obtained by step 4) is heated to Tβ- 115~Tβ- 105 DEG C, then heat preservation is forged
It makes, it is cooling；
P) wherein step 6) includes: that titanium alloy obtained by step 5) is heated to Tβ- 330~TβIt -320 DEG C, keeps the temperature, it is cooling.
In one embodiment, the method for the machining titanium alloy of any one of present invention, with following one or more
Feature:
Q) wherein step 1), the time of heat preservation are 0.5D~0.7D minutes；
R) wherein step 2), the time of heat preservation are 0.5D~0.7D minutes；
S) wherein step 3), the time of heat preservation are 0.4D~0.6D minutes；
T) wherein step 4), the time of heat preservation are 0.6D~0.8D minutes；
U) wherein step 5), the time of heat preservation are 0.7D~0.9D minutes；
V) wherein step 6), the time of heat preservation are 6~8 hours；
In terms of millimeter, D is the diameter of titanium alloy or the value of thickness.Preferably, if titanium alloy is round billet (cylindrical body base
Material), D is its diameter value；Preferably, if titanium alloy is slab (cuboid blank), D is its thickness value.
In one embodiment, the method for the machining titanium alloy of any one of present invention, the forging includes:
One or many Upsettings is carried out to titanium alloy, and
One or many pulling deformations；
Preferably, the forging includes that a Upsetting and primary pulling deformation are successively carried out to titanium alloy；
Preferably, titanium alloy is rodlike, and Upsetting and pulling deformation are all axis directions along the rodlike titanium alloy.
In one embodiment, the method for the machining titanium alloy of any one of present invention, Upsetting and/or pulling become
The deflection of shape is 30~50%；
Preferably, step 1)~4) in, the deflection of Upsetting and/or pulling deformation is 40~50%
Preferably, in step 5), the deflection of Upsetting and/or pulling deformation is 30~40%.
In one embodiment, the method for the machining titanium alloy of any one of present invention, it is described to be cooled to water cooling or sky
It is cold,
Preferably, step 1)~4), cooling mode is water cooling；
Preferably, step 5)~6), cooling mode is air-cooled.
In one embodiment, the present invention any one of machining titanium alloy method, the titanium alloy for needing to process be through
Titanium alloy after cogging forging:
Preferably, cogging forging is that titanium alloy raw material (such as titan alloy casting ingot) is heated to 1150 DEG C, is kept the temperature, then
Forging, cooling, forging preferably includes 1 Upsetting and 1 pulling deformation.
In one embodiment, the method for the machining titanium alloy of any one of present invention, the titanium alloy for needing to process
Composition containing by weight:
Al:3%~3.7% (such as 3.5%)；
Mo:2.5%~4% (such as 2.5%, 3% or 3.5%)；
Zr:2%~4% (such as 3%)；
Si:0%~0.35% (such as 0.08%, 0.1%, 0.15% or 0.25%)；
M:M is Cr and/or Fe, if M is Cr, the content of Cr is 2.3%~3.3% (such as 2.5% or 3%), if
M is Fe, and the content of Fe is 0.4%~1.2% (such as 0.6%, 0.8% or 1.0%), if M is made of Cr and Fe, Cr and
Fe total content is 0.4%~3.3% (mass ratio of such as 1.0% or 2.5%, Cr and Fe are preferably 0.01~100)；
Impurity element total amount≤0.4%, surplus Ti；
Preferably, the impurity element includes one or more selected from following element: C, O, N, H；
Preferably, in the impurity element, if so, C≤0.04%, O≤0.15%, N≤0.04%, H≤
0.015%.
In one embodiment, the method for the machining titanium alloy of any one of present invention, the titanium alloy for needing to process
With following one or more features:
A) content of Si is 0%~0.1%；
If b) M is Cr, the content of Cr is 2.3%~3%,
If c) M is Fe, the content of Fe is 1%~1.2%,
If d) M is made of Cr and Fe, Cr and Fe total content is 1%~3%.
Third aspect present invention provides a kind of titanium alloy, is obtained by method any one of of the invention.
In one embodiment, the titanium alloy of any one of present invention, the composition of the titanium alloy contain by weight
:
Al:3%~3.7% (such as 3.5%)；
Mo:2.5%~4% (such as 2.5%, 3% or 3.5%)；
Zr:2%~4% (such as 3%)；
Si:0%~0.35% (such as 0.08%, 0.1%, 0.15% or 0.25%)；
M:M is Cr and/or Fe, if M is Cr, the content of Cr is 2.3%~3.3% (such as 2.5% or 3%), if
M is Fe, and the content of Fe is 0.4%~1.2% (such as 0.6%, 0.8% or 1.0%), if M is made of Cr and Fe, Cr and
Fe total content is 0.4%~3.3% (mass ratio of such as 1.0% or 2.5%, Cr and Fe are preferably 0.01~100)；
Impurity element total amount≤0.4%, surplus Ti；
Preferably, the impurity element includes one or more selected from following element: C, O, N, H；
Preferably, in the impurity element, if so, C≤0.04%, O≤0.15%, N≤0.04%, H≤
0.015%.
In some embodiments of the present invention, the titanium alloy blank for needing to process is round billet or slab.
In one embodiment, water cooling, which refers to, immerses cooling in 15 DEG C~25 DEG C water for titanium alloy blank.
In one embodiment, it is air-cooled refer to titanium alloy blank is placed in air it is cooling.
In one embodiment, TβRefer to alpha+beta/beta transformation point of titanium alloy.
In one embodiment, deflection refers to the ratio of blank height or length variable quantity and initial value.
In one embodiment, its T can be determined according to the specific ingredient of titanium alloyβValue.Without being limited by theory, Tβ
Value may be influenced by elemental gas such as the nominal composition of titanium alloy and O, N.The titanium that those skilled in the art process as needed
The specific ingredient of alloy can determine the specific T of the titanium alloyβValue.
In one embodiment, in the name of chemical component indicates the ingredient of alloy.
In one embodiment, impurity element also contains other elements, and other elements refer to be produced in titanium or titanium alloy
Intrinsic microelement in the process, rather than the element artificially added.Other elements may include one kind or more of following element
Kind: V, Sn, Mn, Ni, Cu, Y.It is preferred that the content of single other elements is not more than 0.1 weight %, the preferably content of Y is not more than
The summation of 0.005 weight %, preferably other elements are not more than 0.2 weight %.
In one embodiment, the nominal chemical component of the titanium alloy or titanium alloy product that need to process is selected from as follows
1~16 shown in table 1:
Table 1
In one embodiment, titanium alloy product of the invention is obtained by processing method of the invention.
In one embodiment, the titanium alloy for needing to process obtains the present invention after processing method processing of the invention
Titanium alloy product.
In one embodiment, the present invention is according to GB/T228.1-2010 " metal material stretching test part 1: room
Warm test method ", carry out room temperature tensile properties test.Tensile strength is preferably room temperature tensile intensity, and yield strength is preferably room
Warm yield strength.
Beneficial effects of the present invention
Some embodiments of the present invention have it is following one or more the utility model has the advantages that
1) titanium alloy of some embodiments has improved temperature-room type plasticity, especially room temperature elongation percentage A%；
2) there is the titanium alloy that the processing method of some embodiments obtains improved temperature-room type plasticity, especially room temperature to extend
Rate A%.
Specific embodiment
Below by embodiment, technical scheme of the present invention will be described in further detail.
Embodiment 1
Acquisition nominal composition is the titan alloy casting ingot of Ti-3.5Al-2.5Mo-2Zr-2.3Cr (weight percent, %),
1150 DEG C of cogging forgings, obtain the rodlike titanium alloy blank for needing to process, Φ 160mm, the T of the titanium alloyβIt is 900~915
℃。
1) titanium alloy blank processed will be needed to be heated to Tβ+ 60 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
2) titanium alloy obtained by step 1) is heated to Tβ- 30 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
3) titanium alloy obtained by step 2) is heated to Tβ+ 20 DEG C, 80min is kept the temperature, is then forged, first mushrooming deformation 50%,
Deformation 50% is pulled out again, is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
4) titanium alloy obtained by step 3) is heated to Tβ- 70 DEG C, 110min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
5) titanium alloy obtained by step 4) is heated to Tβ- 100 DEG C, 130min is kept the temperature, is then forged, first mushrooming deformation
30%, then deformation 30% is pulled out, forging is placed in air cooling；
6) T is heated to titanium alloy obtained by step 5)β- 300 DEG C, 6h is kept the temperature, then air-cooled, the titanium for obtaining embodiment 1 closes
Golden product.
Embodiment 2
Acquisition nominal composition is the titanium alloy casting of Ti-3.7Al-3Mo-4Zr-3Cr-0.08Si (weight percent, %)
Ingot forges in 1150 DEG C of coggings, obtains the rodlike titanium alloy blank for needing to process, Φ 160mm, the T of the titanium alloyβFor 895~
910℃。
1) titanium alloy blank processed will be needed to be heated to Tβ+ 55 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
40%, then deformation 40% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
2) titanium alloy obtained by step 1) is heated to Tβ- 35 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
40%, then deformation 40% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
3) titanium alloy obtained by step 2) is heated to Tβ+ 15 DEG C, 80min is kept the temperature, is then forged, first mushrooming deformation 40%,
Deformation 40% is pulled out again, is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
4) titanium alloy obtained by step 3) is heated to Tβ- 75 DEG C, 110min is kept the temperature, is then forged, first mushrooming deformation
40%, then deformation 40% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
5) titanium alloy obtained by step 4) is heated to Tβ- 110 DEG C, 130min is kept the temperature, is then forged, first mushrooming deformation
40%, then deformation 40% is pulled out, forging is placed in air cooling；
6) T is heated to titanium alloy obtained by step 5)β- 310 DEG C, 6h is kept the temperature, then air-cooled, the titanium for obtaining embodiment 2 closes
Golden product.
Embodiment 3
Acquisition nominal composition is the titan alloy casting ingot of Ti-3Al-4Mo-3Zr-1Fe (weight percent, %), at 1150 DEG C
Cogging forging, obtains the rodlike titanium alloy blank for needing to process, Φ 160mm, the T of the titanium alloyβIt is 905~920 DEG C.
1) titanium alloy blank processed will be needed to be heated to Tβ+ 65 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
2) titanium alloy obtained by step 1) is heated to Tβ- 25 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
3) titanium alloy obtained by step 2) is heated to Tβ+ 25 DEG C, 80min is kept the temperature, is then forged, first mushrooming deformation 50%,
Deformation 50% is pulled out again, is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
4) titanium alloy obtained by step 3) is heated to Tβ- 65 DEG C, 110min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
5) titanium alloy obtained by step 4) is heated to Tβ- 120 DEG C, 130min is kept the temperature, is then forged, first mushrooming deformation
30%, then deformation 30% is pulled out, forging is placed in air cooling；
6) T is heated to titanium alloy obtained by step 5)β- 330 DEG C, 6h is kept the temperature, then air-cooled, the titanium for obtaining embodiment 3 closes
Golden product.
Embodiment 4
Acquisition nominal composition is the titan alloy casting ingot of Ti-3Al-2.5Mo-2Zr-3Cr (weight percent, %), 1150
DEG C cogging forging, obtains the rodlike titanium alloy blank for needing to process, Φ 160mm, the T of the titanium alloyβIt is 885~900 DEG C.
1) titanium alloy blank processed will be needed to be heated to Tβ+ 55 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
2) titanium alloy obtained by step 1) is heated to Tβ- 35 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
3) titanium alloy obtained by step 2) is heated to Tβ+ 20 DEG C, 80min is kept the temperature, is then forged, first mushrooming deformation 50%,
Deformation 50% is pulled out again, is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
4) titanium alloy obtained by step 3) is heated to Tβ- 75 DEG C, 110min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
5) titanium alloy obtained by step 4) is heated to Tβ- 90 DEG C, 130min is kept the temperature, is then forged, first mushrooming deformation
30%, then deformation 30% is pulled out, forging is placed in air cooling；
6) T is heated to titanium alloy obtained by step 5)β- 300 DEG C, 6h is kept the temperature, then air-cooled, the titanium for obtaining embodiment 4 closes
Golden product.
Embodiment 5
Acquisition nominal composition is the titan alloy casting ingot of Ti-3.5Al-2.5Mo-3Zr-1.2Fe (weight percent, %),
1150 DEG C of cogging forgings, obtain the rodlike titanium alloy blank for needing to process, Φ 160mm, the T of the titanium alloyβIt is 920~935
℃。
1) titanium alloy blank is heated to Tβ+ 60 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation 50%, then pull out
Long deformation 50% is put into rapidly cooling in the water that temperature is 15 DEG C~25 DEG C after forging；
2) titanium alloy obtained by step 1) is heated to Tβ- 30 DEG C, 100min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
3) titanium alloy obtained by step 2) is heated to Tβ+ 20 DEG C, 80min is kept the temperature, is then forged, first mushrooming deformation 50%,
Deformation 50% is pulled out again, is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
4) titanium alloy obtained by step 3) is heated to Tβ- 70 DEG C, 110min is kept the temperature, is then forged, first mushrooming deformation
50%, then deformation 50% is pulled out, it is put into rapidly after forging cooling in the water that temperature is 15 DEG C~25 DEG C；
5) titanium alloy obtained by step 4) is heated to Tβ- 100 DEG C, 130min is kept the temperature, is then forged, first mushrooming deformation
30%, then deformation 30% is pulled out, forging is placed in air cooling；
6) T is heated to titanium alloy obtained by step 5)β- 300 DEG C, 6h is kept the temperature, then air-cooled, the titanium for obtaining embodiment 5 closes
Golden product.
Comparative example 1
Comparative example 1 is the titanium alloy product of embodiment 1 in CN102212716A.Nominal composition is Ti-3.5Al-2.5Mo-
The titanium alloy blank of 2Zr-2.3Cr (weight percent, %), in Tβ- 30~TβAfter multiple pier pulls out forging at+80 DEG C, at 650 DEG C
Heat preservation 1 hour, it is air-cooled.
Analysis detection
(1) it samples: the titanium alloy product that Examples 1 to 5 and comparative example 1 obtain is taken at least two along charge length direction
The sample blank of 14 × 75mm of root Φ is processed into 5 standard tensile specimen of δ that gauge length section diameter is 5mm.
(2) test method: according to GB/T228.1-2010 " metal material stretching test part 1: room temperature test side
Method ", room temperature tensile properties test has been carried out, room temperature elongation percentage (elongation after fracture) A%, tensile strength Rm and surrender are tested
Intensity Rp0.2。
(3) test result:
Test result is referring to the following table 2:
Table 2
The above test result explanation, the titanium alloy after the method for the present invention is processed have improved temperature-room type plasticity, especially
It is room temperature elongation percentage A%, tensile strength Rm and yield strength Rp0.2, especially room temperature elongation percentage A% is significantly higher than patent
The embodiment 1 of CN102212716A.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this
The spirit of inventive technique scheme should all cover within the scope of the technical scheme claimed by the invention.
Claims (20)
1. a kind of method of machining titanium alloy comprising following steps 1)~6):
1) titanium alloy processed will be needed to be heated to Tβ+ 50~Tβ+ 70 DEG C, then heat preservation is forged, cooling；
2) titanium alloy obtained by step 1) is heated to Tβ- 40~Tβ- 20 DEG C, then heat preservation is forged, cooling；
3) titanium alloy obtained by step 2) is heated to Tβ+ 10~Tβ+ 30 DEG C, then heat preservation is forged, cooling；
4) titanium alloy obtained by step 3) is heated to Tβ- 80~Tβ- 60 DEG C, then heat preservation is forged, cooling；
5) titanium alloy obtained by step 4) is heated to Tβ- 130~Tβ- 80 DEG C, then heat preservation is forged, cooling；
6) titanium alloy obtained by step 5) is heated to Tβ- 350 DEG C~TβIt -300 DEG C, keeps the temperature, it is cooling；
Wherein, the group of the titanium alloy becomes by weight:
Al:3%~3.7%；
Mo:2.5%~4%；
Zr:2%~4%；
Si:0%~0.35%；
M:M is Cr and/or Fe, if M is Cr, the content of Cr is 2.3%~3.3%, if M is Fe, the content of Fe is 0.4%
~1.2%, if M is made of Cr and Fe, Cr and Fe total content is 0.4%~3.3%；
Impurity element total amount≤0.4%, surplus Ti.
2. according to the method described in claim 1, the titanium alloy has following one or more features:
A) content of Si is 0%~0.1%；
If b) M is Cr, the content of Cr is 2.3%~3%；
If c) M is Fe, the content of Fe is 1%~1.2%；
If d) M is made of Cr and Fe, Cr and Fe total content is 1%~3%.
3. according to the method described in claim 1, the impurity element includes one or more selected from following element: C, O, N,
H。
4. according to the method described in claim 3, in the impurity element, C≤0.04%, O≤0.15%, N≤0.04%, H
≤ 0.015%.
5. according to the method described in claim 1, it is with following one or more features:
E) wherein step 1) will need the titanium alloy processed to be heated to Tβ+ 55~Tβ+ 65 DEG C, then heat preservation is forged, cooling；
Titanium alloy obtained by step 1) is heated to T by f) wherein step 2)β- 35~Tβ- 25 DEG C, then heat preservation is forged, cooling；
Titanium alloy obtained by step 2) is heated to T by g) wherein step 3)β+ 15~Tβ+ 25 DEG C, then heat preservation is forged, cooling；
Titanium alloy obtained by step 3) is heated to T by h) wherein step 4)β- 75~Tβ- 65 DEG C, then heat preservation is forged, cooling；
Titanium alloy obtained by step 4) is heated to T by i) wherein step 5)β- 120~Tβ- 90 DEG C, then heat preservation is forged, cooling；
Titanium alloy obtained by step 5) is heated to T by j) wherein step 6)β- 340~TβIt -310 DEG C, keeps the temperature, it is cooling.
6. according to the method described in claim 1, it is with following one or more features:
K) wherein step 1) will need the titanium alloy processed to be heated to Tβ+ 60 DEG C, then heat preservation is forged, cooling；
L) wherein step 2) includes: that titanium alloy obtained by step 1) is heated to Tβ- 30 DEG C, then heat preservation is forged, cooling；
M) wherein step 3) includes: that titanium alloy obtained by step 2) is heated to Tβ+ 20 DEG C, then heat preservation is forged, cooling；
N) wherein step 4) includes: that titanium alloy obtained by step 3) is heated to Tβ- 70 DEG C, then heat preservation is forged, cooling；
O) wherein step 5) includes: that titanium alloy obtained by step 4) is heated to Tβ- 115~Tβ- 105 DEG C, then heat preservation is forged, cold
But；
P) wherein step 6) includes: that titanium alloy obtained by step 5) is heated to Tβ- 330~TβIt -320 DEG C, keeps the temperature, it is cooling.
7. according to the method described in claim 1, it is with following one or more features:
Q) wherein step 1), the time of heat preservation are 0.5D~0.7D minutes；
R) wherein step 2), the time of heat preservation are 0.5D~0.7D minutes；
S) wherein step 3), the time of heat preservation are 0.4D~0.6D minutes；
T) wherein step 4), the time of heat preservation are 0.6D~0.8D minutes；
U) wherein step 5), the time of heat preservation are 0.7D~0.9D minutes；
V) wherein step 6), the time of heat preservation are 6~8 hours；
In terms of millimeter, D is the diameter of titanium alloy or the value of thickness.
8. according to the method described in claim 1, the forging includes:
One or many Upsettings is carried out to titanium alloy, and
One or many pulling deformations.
9. according to the method described in claim 8, it is with following one or more features:
The forging includes that a Upsetting and primary pulling deformation are successively carried out to titanium alloy；
Titanium alloy be it is rodlike, Upsetting and pulling deformation are all axis directions along the rodlike titanium alloy.
10. according to the method described in claim 8, Upsetting and/or the deflection of pulling deformation are 30~50%.
11. according to the method described in claim 10, it is with following one or more features:
Step 1)~4) in, the deflection of Upsetting and/or pulling deformation is 40~50%；
In step 5), the deflection of Upsetting and/or pulling deformation is 30~40%.
12. according to the method described in claim 1, described be cooled to water cooling or air-cooled.
13. according to the method for claim 12, with following one or more features:
Step 1)~4), cooling mode is water cooling；
Step 5)~6), cooling mode is air-cooled.
14. according to the method described in claim 1, needing the titanium alloy processed is the titanium alloy after cogging is forged.
15. according to the method for claim 14, with following one or more features:
Cogging forging is that titanium alloy raw material is heated to 1150 DEG C, and then heat preservation is forged, cooling；
The titanium alloy raw material is titan alloy casting ingot.
16. according to the method for claim 15, forging includes that 1 Upsetting and 1 pulling deform.
17. according to the method described in claim 1, titanium alloy made from the method has following one or more features:
The room temperature elongation percentage of the titanium alloy is 30~70%；
The yield strength Rp of the titanium alloy0.2For 875~950MPa；
The tensile strength Rm of the titanium alloy is 960~1100MPa.
18. according to the method described in claim 1, the titanium alloy that the method obtains has following one or more features:
The room temperature elongation percentage of the titanium alloy is 30~60%；
The yield strength Rp of the titanium alloy0.2For 880~920MPa；
The tensile strength Rm of the titanium alloy is 965~995MPa.
19. according to the method described in claim 1, the room temperature elongation percentage for the titanium alloy that the method obtains is 40~60%.
20. a kind of titanium alloy is obtained by the method for any one of claim 1~19.
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