CN103122442A - Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling - Google Patents
Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001816 cooling Methods 0.000 title claims abstract description 29
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract 14
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims 3
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- 238000001125 extrusion Methods 0.000 abstract 1
- 238000003754 machining Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000002791 soaking Methods 0.000 description 49
- 238000009413 insulation Methods 0.000 description 48
- 230000007704 transition Effects 0.000 description 25
- 238000010792 warming Methods 0.000 description 15
- 238000005242 forging Methods 0.000 description 14
- 230000008520 organization Effects 0.000 description 11
- 229910052709 silver Inorganic materials 0.000 description 10
- 239000004332 silver Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 238000003556 assay Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 238000007669 thermal treatment Methods 0.000 description 3
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229960000074 biopharmaceutical Drugs 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000010275 isothermal forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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Abstract
一种通过炉冷在钛合金中获得三态组织的方法，包括近β温度保温水冷、普通两相区保温炉冷和两相区内较低温保温空冷。通过近β温度保温水冷在钛合金组织中保留10%～20%的等轴初生α相，余下的为马氏体。通过普通两相区保温炉冷使试样组织改变为α等轴+α粗条片+β残留。通过两相区内较低温保温空冷得到具有三态组织的钛合金。本发明无需近β热变形，不产生变形不均匀热效应，易于控制温度，对钛合金的初始等轴组织无需进行专门的预处理变成双态组织。本发明简便易行且使用范围广泛，可广泛应用于轧制、挤压以及以机械加工成形等方法制造的钛合金零件的热处理，以至获得三态组织。
A method for obtaining a three-state structure in a titanium alloy through furnace cooling, including heat preservation water cooling near β temperature, ordinary two-phase region heat preservation furnace cooling, and lower temperature heat preservation air cooling in the two-phase region. 10% to 20% of the equiaxed primary α phase is retained in the titanium alloy structure by heat preservation and water cooling at a temperature near β, and the rest is martensite. The structure of the sample is changed to α equiaxed + α thick strips + β residue by ordinary two-phase holding furnace cooling. A titanium alloy with a three-state structure was obtained by heat preservation and air cooling at a lower temperature in the two-phase region. The invention does not require near-beta thermal deformation, does not produce non-uniform thermal effects of deformation, is easy to control temperature, and does not need to perform special pretreatment on the initial equiaxed structure of titanium alloy to change it into a two-state structure. The invention is easy to implement and has a wide range of applications, and can be widely used in the heat treatment of titanium alloy parts manufactured by rolling, extrusion and machining forming methods, so as to obtain a three-state structure.
Description
Technical field
The present invention relates to the titanium alloy technical field of hot working, specifically a kind of heat treating method that passes through the cold acquisition tri-state of stove tissue in the biphase titanium alloy of equiaxed structure or bifurcation tissue.
Background technology
Biphase titanium alloy has the advantages such as density is little, specific tenacity is high, high temperature resistant, corrosion-resistant as a kind of high performance material, occupies an important position in fields such as aerospace, petrochemical complex, bio-pharmaceuticals.Especially in aviation as crucial load bearing structure spare, the room temperature strength plasticity that had not only required, fracture toughness property, fatigue property, resistance to crack extension ability and but also require good high-temperature behavior.The titanium alloy microtexture has determined its military service performance.Biphase titanium alloy has equiaxed structure, bifurcation tissue, Widmannstatten structure, basket tissue and tri-state tissue.Front four kinds are organized on plasticity, high-temperature behavior, fatigue crack extended capability and fracture toughness property relative merits are respectively arranged, and the rational Match of each performance does not have fine solution all the time.The people such as Zhou Yigang have proposed to change by 20% α such as axle such as grade, 50%～60% strip α and remaining β the tri-state tissue that forms in " near β forge overthrown outmoded theoretical developments tri-state tissue ".The tri-state tissue combines the advantage of front four kinds of tissues, and over-all properties is best.Therefore, biphase titanium alloy zero member that obtains to have tri-state tissue is usually the target of pursuit in producing.
And the people such as Zhou Yigang obtain the nearly β forging manufacturing technique of tri-state tissue must be below the β transition point 10～20 ℃ carry out isothermal forging, forging stock during forging is because nonaffine deformation, different sites metal flow speed is different, cause inhomogeneous deformation heating, again because there are thermal conduction all the time in forging stock and mould, mould and the external world, make the forging temperature variation more complicated, so forging process is very difficult to the control of temperature, be easy to cause the forging stock local temperature to exceed or lower than the scope of nearly β temperature.Therefore, this technology exists the forging temperature interval narrower, is not easy to temperature controlled problem.Harbin Institute of Technology has proposed a kind of heat treating method that two steps obtain tri-state tissues that passes through in the notification number of having authorized is the patent of invention of CN101717904: the first step is to be incubated water-cooled after certain hour in the titanium alloy of bifurcation tissue is heated to lower than the temperature range of 10～30 ℃ of β transition points with initial structure, second step is heated to lower than air cooling after insulation certain hour in the temperature range of 40～60 ℃ of β transition points, obtains the tri-state tissue.Requiring initial structure in this patent is the bifurcation tissue, but the original bar, sheet material or the forging stock that are used for shaping biphase titanium alloy part are generally equiaxed structure, organizes and also needs equiaxed structure is carried out special pre-treatment in order to obtain bifurcation.Northwestern Polytechnical University has proposed a kind of method that obtains the tri-state tissue in the titanium alloy local loading and shaping in publication number is the application for a patent for invention of CN102212745A.In the method, obtain into shape Forging after titanium alloy process local loading and shaping, finishing and thermal treatment, by controlling the gain of parameter tri-state tissue of local loading and shaping.But in this invention, still need to forge through the nearly β lower than 10～20 ℃ of β transition points, and the temperature range that nearly β forges is narrower, is not easy to temperature and controls.Northwestern Polytechnical University has proposed to obtain the heat treating method of tri-state tissue in the equiaxed structure titanium alloy in application number is 201210273814.3 and 201210273312.0 application for a patent for invention, do not need in the method nearly β thermal distortion, temperature is easy to control and can directly use the equiaxed structure titanium alloy, but these two patents are not high enough to the flexibility ratio of the adjusting of the thickness of the secondary sheet α in the tri-state tissue, its thickness that obtains the secondary sheet α in the tri-state tissue is less than normal, need the zero member of the secondary sheet α of larger thickness for those, problem not up to standard may appear organizing.Northwestern Polytechnical University has proposed the alpha+beta two-phase region and has forged and add that subsequent heat treatment obtains the method for tri-state tissue in application number is the application for a patent for invention of CN201210273255.6 and CN201210273254.1, in the method, forging belongs to conventional and forges, the forging temperature interval is wider than nearly β forging scope, temperature is more easy to control, and Heating temperature is lower, avoided the problem of the many fire of the high temperature time easy alligatoring of loading crystal grain, but these two patents have been determined and can not can't have been used the zero member of redeformation for those shapes.
Summary of the invention
Narrower for overcoming the temperature range that exists in prior art, be not easy to control the problem of forging temperature, and be the deficiency of the restriction of bifurcation tissue to initial structure, and the thickness problem less than normal of the secondary sheet α in the tri-state tissue that obtains, the present invention proposes a kind of by the cold method that obtains the tri-state tissue in biphase titanium alloy of stove.
Concrete steps of the present invention are:
Step 1, nearly β temperature insulation water-cooled.
Resistance furnace is heated to the nearly β temperature of biphase titanium alloy.Sample is put into resistance furnace.Resistance furnace is warming up to lower than 10～20 ℃ of biphase titanium alloy β transition points and begins insulation, and soaking time is determined according to titanium alloy sample cross section equivalent diameter; The every 1mm insulation of described titanium alloy sample cross section equivalent diameter 0.6～4min.After insulation finishes, in 0.2min, sample is submerged in water, the mode by water-cooled is cooled to room temperature with this sample, and making sample change in organization is α
On axle+ martensite.The nearly β temperature of described alloy is lower than 10～20 ℃ of temperature ranges of alloy β transition point.
Step 2, common two-phase region holding furnace is cold.Resistance furnace is heated to two-phase region temperature lower than titanium alloy.After the two-phase region temperature of resistance furnace arrival lower than titanium alloy, with the α that is organized as that obtains
On axle+ martensitic titanium alloy sample is put into resistance furnace.Begin insulation when resistance furnace is warming up to two-phase region temperature lower than titanium alloy, soaking time is to increase by 30～60min on the basis of soaking time in step 1.Insulation makes the resistance furnace stopped heating after finishing, and the titanium alloy assay furnace is as cold as room temperature.Making sample change in organization is α
On axle+ α
Thick silver+ β
ResidualDescribed two-phase region temperature lower than alloy is the temperature range lower than 40～60 ℃ of β transition points.
Lower temperature insulation air cooling in step 3, two-phase region.Resistance furnace is heated to lesser temps in the titanium alloy two-phase region.After the lesser temps in the temperature arrival titanium alloy two-phase region of resistance furnace, with the α that is organized as that obtains
On axle+ α
Thick silver+ β
Residual StayThe titanium alloy sample put into resistance furnace.Resistance furnace begins insulation when being warming up to lesser temps in the titanium alloy two-phase region, soaking time is to increase by 20～60min on the basis of soaking time in step 1.After insulation finishes, take out titanium alloy sample air cooling to room temperature, obtain having the titanium alloy of tri-state tissue.Lesser temps in described alloy two-phase region is the temperature range lower than 90～120 ℃ of β transition points.
The present invention can keep 10%～20% phase such as primary α such as axle such as grade in the biphase titanium alloy tissue by step 1, remaining is martensite.The insulating process of step 2 makes the axle primary α that waits that obtains in step 1 substantially keep mutually original content and form, and the martensite that obtains in step 1 is decomposed into the alpha+beta tissue of faller gill shape, and certain alligatoring has occured in a part of α faller gill, and the quantity of α faller gill to a certain degree reduces.Stove is cold subsequently, makes the further alligatoring of α sheet, because inhibition is played in the growth of sheet α equity axle α, waits axle α obviously not grow up in the cold process of stove.After cool to room temperature, only retain residual β phase seldom between the sheet sheet of α phase.By the insulation of step 3, α β in opposite directions changes certain ratio mutually, make the thick sheet α that obtains in step 2 attenuate, but quantity is constant, is the β phase between the α phase.Then air cooling, β changes β mutually into
Turn, global tissue has formed by waiting axle α, strip of sheet α and β
TurnThe tri-state that forms is organized biphase titanium alloy.This tri-state homogeneity of structure is very good, and the thickness of the secondary sheet α in tissue is relatively large.The present invention need not nearly β thermal distortion, does not produce the inhomogeneous heat effect of distortion, is easy to control temperature, the initial equiaxed structure of titanium alloy be need not to carry out special pre-treatment become the bifurcation tissue; Heat treating method of the present invention is simple and easy to do and use range is extensive, and that the present invention can be applicable to is rolling, the thermal treatment of extruding and the titanium alloy component made with methods such as mechanical workout shapings, so that obtain the tri-state tissue.Particularly for titanium alloy complex member, local complex component or large-scale component, just can first process the near clean form of member with the mode of mechanical workout, then use heat treating method of the present invention to obtain the tri-state tissue.In addition, can carry out 550～650 ℃ of ageing treatment in temperature range to titanium alloy after obtaining the tri-state tissue as required.
Description of drawings
Accompanying drawing 1 is method flow diagram,
Accompanying drawing 2 is that the β transition point is the original equiaxed structure figure of biphase titanium alloy of 990 ℃,
Accompanying drawing 3 is through the biphase titanium alloy tri-state organization chart after three step thermal treatments.
Embodiment
Embodiment one
The present embodiment is a kind of method of organizing titanium alloy by the cold acquisition tri-state of stove, and sample used is the TA15 titanium alloy, and the profile of sample is cylindrical, and the specification of this sample is Φ 10*15mm; Described TA15 titanium alloy is Ti-6Al-2Zr-1Mo-1V.The β transition point of TA15 titanium alloy is 990 ℃, and initial structure is equiaxed structure.
The concrete implementation step of the present embodiment is:
Step 1, nearly β temperature insulation water-cooled.
Resistance furnace is heated to the nearly β temperature of TA15 titanium alloy, namely lower than the temperature range of 10～20 ℃ of β transition points.In the present embodiment, resistance furnace temperature is 975 ℃, lower than 15 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 975 ℃, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 975 ℃ and begins insulation, and soaking time is determined according to titanium alloy sample cross section equivalent diameter; Every 1mm titanium alloy sample cross section equivalent diameter insulation 0.6～4min.Determine that described soaking time is according to the standard of holding time shown in the first three columns of the upper form 4 of HB/Z199-2005, and in the present embodiment, with the thickness in titanium alloy sample cross section equivalent diameter replacement HB/Z199-2005.Described definite cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy sample cross section equivalent diameter is 10mm, and soaking time is 40min.After insulation finishes, in 0.2min, sample is submerged in water, the mode by water-cooled is cooled to room temperature with this sample, and making sample change in organization is α
On axle+ martensite.
Step 2, common two-phase region holding furnace is cold.
Resistance furnace is heated to the two-phase region temperature of TA15 titanium alloy, namely lower than the temperature range of 40～60 ℃ of β transition points.In the present embodiment, resistance furnace temperature is 950 ℃, lower than 40 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 950 ℃, will be organized as α through what step 1 obtained
On axle+ martensitic titanium alloy sample is put into resistance furnace.Begin insulation when resistance furnace is warming up to 950 ℃, soaking time is to increase by 30～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 40min, increases 30min, and soaking time is 70min.Insulation makes the resistance furnace stopped heating after finishing, and the titanium alloy assay furnace is as cold as room temperature.Making sample change in organization is α
On axle+ α
Thick silver+ β
Residual
Lower temperature insulation air cooling in step 3, two-phase region.
Resistance furnace is heated to lesser temps in TA15 titanium alloy two-phase region, and namely lower than the temperature range of 90～120 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 900 ℃, lower than 90 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 900 ℃, will be organized as α through what step 2 obtained
On axle+ α
Thick silver+ β
ResidualThe titanium alloy sample put into resistance furnace.Begin insulation when resistance furnace is warming up to 900 ℃, soaking time is to increase by 20～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 40min, increases 20min, and soaking time is 60min.After insulation finishes, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
In the present embodiment, can keep the phase such as primary α such as axle such as grade of 15% left and right by step 1 in the titanium alloy tissue, remaining is martensite.The insulating process of step 2 makes the axle primary α that waits that obtains in step 1 substantially keep mutually original content and form, and the martensite that obtains in step 1 is decomposed into the alpha+beta tissue of faller gill shape, and certain alligatoring has occured in a part of α faller gill, and the quantity of α faller gill to a certain degree reduces.Stove is cold subsequently, makes the further alligatoring of α sheet, because inhibition is played in the growth of sheet α equity axle α, waits axle α obviously not grow up in the cold process of stove.After cool to room temperature, only retain residual β phase seldom between the sheet sheet of α phase.By the insulation of step 3, α β in opposite directions changes certain ratio mutually, make the thick sheet α that obtains in step 2 attenuate, but quantity is constant, is the β phase between the α phase.Then air cooling, β changes β mutually into
Turn, global tissue has formed by waiting axle α, strip of sheet α and β
TurnThe tri-state that forms is organized titanium alloy.Owing to having used stove cold in method of the present invention, therefore the one-tenth-value thickness 1/10 of secondary sheet α has very large regulation range, and this tri-state homogeneity of structure is fine.
The heat treating method flow process of the present embodiment is seen Fig. 1, and the original microtexture of TA15 titanium alloy is seen Fig. 2, organizes as shown in Figure 3 through the tri-state through the titanium alloy that obtains after three steps.
Embodiment two
The present embodiment is a kind of method of organizing titanium alloy by the cold acquisition tri-state of stove, and sample used is the TA15 titanium alloy, and the profile of sample is cylindrical, and the specification of this sample is Φ 55*70mm; Described TA15 titanium alloy is Ti-6Al-2Zr-1Mo-1V.The β transition point of TA15 titanium alloy is 990 ℃, and initial structure is the bifurcation tissue.
The concrete implementation step of the present embodiment is:
Step 1, nearly β temperature insulation water-cooled.Resistance furnace is heated to the nearly β temperature of TA15 titanium alloy, namely lower than the temperature range of 10～20 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 970 ℃, lower than 20 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 970 ℃, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 970 ℃ and begins insulation, and soaking time is determined according to titanium alloy sample cross section equivalent diameter; The every 1mm insulation of described titanium alloy sample cross section equivalent diameter 0.6～4min.Determine that described soaking time is according to the standard of holding time shown in the first three columns of the upper form 4 of HB/Z199-2005, and in the present embodiment, with the thickness in titanium alloy sample cross section equivalent diameter replacement HB/Z199-2005.The appendix A according to GJB3763A-2004 of described definite cross section equivalent diameter.In the present embodiment, titanium alloy sample cross section equivalent diameter is 55mm, and soaking time is 55min.After insulation finishes, in 0.2min, sample is submerged in water, the mode by water-cooled is cooled to room temperature with this sample, makes sample change in organization for waiting axle α+martensitic stucture.
Step 2, common two-phase region holding furnace is cold.Resistance furnace is heated to the two-phase region temperature of TA15 titanium alloy, namely lower than the temperature range of 40～60 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 940 ℃, lower than TA15 titanium alloy beta temperature 50 C.After resistance furnace arrives 940 ℃, will be organized as α through what step 1 obtained
On axle+ martensitic titanium alloy sample is put into resistance furnace.Begin insulation when resistance furnace is warming up to 940 ℃, soaking time is to increase by 30～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 55min, increases 45min, and soaking time is 100min.Insulation makes the resistance furnace stopped heating after finishing, and the titanium alloy assay furnace is as cold as room temperature.Making sample change in organization is α
On axle+ α
Thick silver+ β
Residual
Lower temperature insulation air cooling in step 3, two-phase region.Resistance furnace is heated to lesser temps in TA15 titanium alloy two-phase region, and namely lower than the temperature range of 90～120 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 870 ℃, lower than 120 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 870 ℃, will be organized as α through what step 2 obtained
On axle+ α
Thick silver+ β
ResidualThe titanium alloy sample put into resistance furnace.Begin insulation when resistance furnace is warming up to 870 ℃, soaking time is to increase by 20～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 55min, increases 30min, and soaking time is 85min.After insulation finishes, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
Embodiment three
The present embodiment is a kind of method that obtains the tri-state tissue in titanium alloy, and sample used is the TC4 titanium alloy, and the profile of sample is cylindrical, and the specification of this sample is Φ 30*45mm; Described TC4 titanium alloy is Ti-6Al-4V.The β transition point of TC4 titanium alloy is 985 ℃, and initial structure is equiaxed structure.
The concrete implementation step of the present embodiment is:
Step 1, nearly β temperature insulation water-cooled.Resistance furnace is heated to the nearly β temperature of TC4 titanium alloy, namely lower than the temperature range of 10～20 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 975 ℃, lower than 10 ℃ of TC4 titanium alloy beta temperature.After the temperature of resistance furnace arrives 975 ℃, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 975 ℃ and begins insulation, and soaking time is determined according to titanium alloy sample cross section equivalent diameter; The every 1mm insulation of described titanium alloy sample cross section equivalent diameter 0.6～4min.Determine that described soaking time is according to the standard of holding time shown in the first three columns of the upper form 4 of HB/Z199-2005, and in the present embodiment, with the thickness in titanium alloy sample cross section equivalent diameter replacement HB/Z199-2005.Described definite cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy sample cross section equivalent diameter is 30mm, and soaking time is 45min.After insulation finishes, in 0.2min, sample is submerged in water, the mode by water-cooled is cooled to room temperature with this sample, and making sample change in organization is α
On axle+ martensite.
Step 2, common two-phase region holding furnace is cold.Resistance furnace is heated to the two-phase region temperature of TC4 titanium alloy, namely lower than the temperature range of 40～60 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 925 ℃, lower than TC4 titanium alloy beta temperature 60 C.After resistance furnace arrives 925 ℃, will be organized as α through what step 1 obtained
On axle+ martensitic titanium alloy sample is put into resistance furnace.Begin insulation when resistance furnace is warming up to 925 ℃, soaking time is to increase by 30～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 45min, increases 30min, and soaking time is 75min.Insulation makes the resistance furnace stopped heating after finishing, and the titanium alloy assay furnace is as cold as room temperature.Making sample change in organization is α
On axle+ α
Thick silver+ β
Residual
Lower temperature insulation air cooling in step 3, two-phase region.Resistance furnace is heated to lesser temps in TC4 titanium alloy two-phase region, and namely lower than the temperature range of 90～120 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 885 ℃, lower than 100 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 885 ℃, will be organized as α through what step 2 obtained
On axle+ α
Thick silver+ β
ResidualThe titanium alloy sample put into resistance furnace.Begin insulation when resistance furnace is warming up to 885 ℃, soaking time is to increase by 20～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 45min, increases 60min, and soaking time is 105min.After insulation finishes, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
Embodiment four
The present embodiment is a kind of method that obtains the tri-state tissue in titanium alloy, and sample used is the TC4 titanium alloy, and the profile of sample is rectangular parallelepiped, and the specification of this sample is 168*168*300mm; Described TC4 titanium alloy is Ti-6Al-4V.The β transition point of TC4 titanium alloy is 995 ℃, and initial structure is the bifurcation tissue.
The concrete implementation step of the present embodiment is:
Step 1, nearly β temperature insulation water-cooled.Resistance furnace is heated to the nearly β temperature of TC4 titanium alloy, namely lower than the temperature range of 10～20 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 975 ℃, lower than 20 ℃ of TC4 titanium alloy beta temperature.After the temperature of resistance furnace arrives 975 ℃, sample is put into resistance furnace.Resistance furnace is warming up to 975 ℃ and begins insulation, and soaking time is determined according to titanium alloy sample cross section equivalent diameter; The every 1mm insulation of described titanium alloy sample cross section equivalent diameter 0.6～4min.Determine that described soaking time is according to the standard of holding time shown in the first three columns of the upper form 4 of HB/Z199-2005, and in the present embodiment, with the thickness in titanium alloy sample cross section equivalent diameter replacement HB/Z199-2005.Described definite cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy sample cross section equivalent diameter is 210mm, and soaking time is 126min.After insulation finishes, in 0.2min, sample is submerged in water, the mode by water-cooled is cooled to room temperature with this sample, and making sample change in organization is α
On axle+ martensite.
Step 2, common two-phase region holding furnace is cold.Resistance furnace is heated to the two-phase region temperature of TC4 titanium alloy, namely lower than the temperature range of 40～60 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 950 ℃, lower than TC4 titanium alloy beta temperature 45 C.After resistance furnace arrives 950 ℃, will be organized as α through what step 1 obtained
On axle+ martensitic titanium alloy sample is put into resistance furnace.Begin insulation when resistance furnace is warming up to 950 ℃, soaking time is to increase by 30～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 126min, increases 60min, and soaking time is 186min.Insulation makes the resistance furnace stopped heating after finishing, and the titanium alloy assay furnace is as cold as room temperature.Making sample change in organization is α
On axle+ α
Thick silver+ β
Residual
Lower temperature insulation air cooling in step 3, two-phase region.Resistance furnace is heated to lesser temps in TC4 titanium alloy two-phase region, and namely lower than the temperature range of 90～120 ℃ of β transition points, in the present embodiment, resistance furnace temperature is 885 ℃, lower than 110 ℃ of TA15 titanium alloy beta temperature.After the temperature of resistance furnace arrives 885 ℃, will be organized as α through what step 2 obtained
On axle+ α
Thick silver+ β
ResidualThe titanium alloy sample put into resistance furnace.Begin insulation when resistance furnace is warming up to 885 ℃, soaking time is to increase by 20～60min on the basis of soaking time in step 1.In the present embodiment, the soaking time in step 1 is 126min, increases 50min, and soaking time is 176min.After insulation finishes, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
Claims (4)
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| CN201310014674.2A CN103122442B (en) | 2013-01-15 | 2013-01-15 | Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling |
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| CN201310014674.2A CN103122442B (en) | 2013-01-15 | 2013-01-15 | Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling |
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