CN103122442B - 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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- CN103122442B CN103122442B CN201310014674.2A CN201310014674A CN103122442B CN 103122442 B CN103122442 B CN 103122442B CN 201310014674 A CN201310014674 A CN 201310014674A CN 103122442 B CN103122442 B CN 103122442B
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Abstract
The invention discloses a method for obtaining a tri-modal microstructure in dual-phase titanium alloy through furnace cooling. The method comprises the following steps of: carrying out heat insulation water cooling at near beta temperature; carrying out heat insulation furnace cooling in a common two-phase region and carrying out heat insulation air cooling in a two-phase region at lower temperature. 10-20% of primary equiaxial alpha phases are remained in a titanium alloy microstructure through carrying out heat insulation water cooling at near beta temperature, and the rests are martensites. A test sample microstructure is changed into alpha equal axle, alpha thick silvers and beta residues through carrying out heat insulation furnace cooling in the common two-phase region. The titanium alloy with the tri-modal microstructure is obtained through carrying out heat insulation air cooling in the two-phase region at lower temperature. The method is free of near beta thermal deformation, deformation and nonuniform thermal effect and easy for temperature control, and a dual-modal microstructure can be obtained without carrying out special pretreatment on a primary equiaxial microstructure of the titanium alloy. The method is simple, convenient, feasible and wide in application rang and can be widely used for thermal treatment of titanium alloy parts manufactured by using methods such as rolling, squeezing, machining, forming and the like so as to obtain the tri-modal microstructure.
Description
Technical field
The present invention relates to titanium alloy technical field of hot working, specifically a kind of in the biphase titanium alloy of equiaxed structure or bifurcation tissue by the heat treating method of the cold acquisition tri-state tissue of stove.
Background technology
Biphase titanium alloy, as the high performance material of one, has the advantages such as density is little, specific tenacity is high, high temperature resistant, corrosion-resistant, occupies an important position in fields such as aerospace, petrochemical complex, bio-pharmaceuticals.Especially in aviation as crucial load bearing structure part, the room temperature strength plasticity, fracture toughness property, fatigue property, resistance to crack extension ability and but also the high-temperature behavior required that had not only required.Titanium alloy microtexture determines its military service performance.Biphase titanium alloy has equiaxed structure, bifurcation tissue, Widmannstatten structure, basket tissue and tri-state tissue.First four kinds are organized in plasticity, high-temperature behavior, fatigue crack extended capability and fracture toughness property and respectively have relative merits, and the rational Match of each performance does not solve all the time very well.The people such as Zhou Yigang propose and change by 20% α such as axle such as grade, 50% ~ 60% strip α and remaining β the tri-state tissue formed in " near-beta forging overthrows outmoded theoretical developments tri-state tissue ".Tri-state tissue combines the advantage of front four kinds of tissues, and over-all properties is best.Therefore, obtaining biphase titanium alloy zero component with tri-state tissue is usually the target pursued in producing.
And the people such as Zhou Yigang obtain tri-state tissue near-beta forging technology must below β transition point 10 ~ 20 DEG C carry out isothermal forging, forging stock during forging is because nonaffine deformation, different sites metal flow speed is different, cause uneven deformation heating, again because forging stock and mould, mould and the external world exist thermal conduction all the time, make forging temperature variation more complicated, so forging process is very difficult to the control of temperature, be easy to cause forging stock local temperature to exceed or lower than the scope of nearly β temperature.Therefore, it is narrower to there is forging temperature interval in this technology, is not easy to temperature controlled problem.Harbin Institute of Technology is propose a kind of heat treating method being obtained tri-state tissue by two steps in the patent of invention of CN101717904 at the notification number of having authorized: initial structure is water-cooled after the titanium alloy of bifurcation tissue is heated to lower than β transition point 10 ~ 30 DEG C temperature range inside holding certain hour by the first step, second step is heated to air cooling after the temperature range inside holding certain hour lower than β transition point 40 ~ 60 DEG C, obtains tri-state tissue.Require in this patent that initial structure is bifurcation tissue, but be generally equiaxed structure for the original bar of the biphase titanium alloy part that is shaped, sheet material or forging stock, organize also need to carry out special pre-treatment to equiaxed structure to obtain bifurcation.Northwestern Polytechnical University is propose a kind of method obtaining tri-state tissue in titanium alloy local loading and shaping in the application for a patent for invention of CN102212745A at publication number.In the method, titanium alloy obtains into shape Forging through local loading and shaping, finishing after thermal treatment, by the gain of parameter tri-state tissue of controls local loading and shaping.But in the invention, still need through the near-beta forging lower than β transition point 10 ~ 20 DEG C, and the temperature range of near-beta forging is narrower, is not easy to temperature and controls.Northwestern Polytechnical University is propose the heat treating method obtaining tri-state tissue in equiaxed structure titanium alloy in the application for a patent for invention of 201210273814.3 and 201210273312.0 at application number, do not need nearly β thermal distortion in the method, temperature is easy to control and can directly use equiaxed structure titanium alloy, but the flexibility ratio of these two patents to the adjustment of the thickness of the secondary sheet α in tri-state tissue is not high enough, its thickness obtaining the secondary sheet α in tri-state tissue is less than normal, those are needed to zero component of the secondary sheet α of more heavy thickness, may occur organizing problem not up to standard.Northwestern Polytechnical University is propose the forging of alpha+beta two-phase region in the application for a patent for invention of CN201210273255.6 and CN201210273254.1 to add that subsequent heat treatment obtains the method for tri-state tissue at application number, in the method, forging belongs to conventional forging, forging temperature is interval wider than near-beta forging scope, temperature is more easy to control, and Heating temperature is lower, avoid the problem that the many fire of high temperature load the easy alligatoring of crystal grain, but these two patents have been determined cannot to use zero component of redeformation for those shapes.
Summary of the invention
Narrower for overcoming the temperature range existed in prior art, be not easy to the problem of controlled forge process temperature, and be the deficiency of restriction of bifurcation tissue to initial structure, and obtain the thickness of secondary sheet α in tri-state tissue problem less than normal, the present invention proposes a kind of by the cold method obtaining tri-state tissue in biphase titanium alloy of stove.
Concrete steps of the present invention are:
Step one, nearly β temperature 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 and starts insulation lower than biphase titanium alloy β transition point 10 ~ 20 DEG C, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; The every 1mm of described titanium alloy specimen cross section equivalent diameter is incubated 0.6 ~ 4min.After insulation terminates, in 0.2min, sample is submerged in water, by the mode of water-cooled, this sample is cooled to room temperature, makes sample tissue change into α
on axle+ martensite.The nearly β temperature of described alloy is lower than alloy β transition point 10 ~ 20 DEG C of temperature ranges.
Step 2, common two-phase region holding furnace is cold.Resistance furnace is heated to the two-phase region temperature lower than titanium alloy.When resistance furnace arrives after lower than the two-phase region temperature of titanium alloy, be organized as α by what obtain
on axleresistance furnace put into by+martensitic titanium alloy sample.Start when resistance furnace is warming up to the two-phase region temperature lower than titanium alloy insulation, soaking time be soaking time in step one basis on increase by 30 ~ 60min.After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature.Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual.The described two-phase region temperature lower than alloy is the temperature range lower than β transition point 40 ~ 60 DEG C.
Step 3, comparatively low-temperature insulation air cooling in two-phase region.Resistance furnace is heated to the lesser temps in titanium alloy two-phase region.After the temperature of resistance furnace arrives the lesser temps in titanium alloy two-phase region, be organized as α by what obtain
on axle+ α
thick silver+ β
residual staytitanium alloy sample put into resistance furnace.Resistance furnace start when being warming up to the lesser temps in titanium alloy two-phase region insulation, soaking time be soaking time in step one basis on increase by 20 ~ 60min.After insulation terminates, take out titanium alloy sample air cooling to room temperature, obtain the titanium alloy with tri-state tissue.Lesser temps in described alloy two-phase region is the temperature range lower than β transition point 90 ~ 120 DEG C.
The present invention can retain the primary alpha phase such as axle such as grade of 10% ~ 20% by step one in biphase titanium alloy tissue, and remaining is martensite.The insulating process of step 2 makes the axle primary alpha phase that waits obtained in step one substantially keep original content and form, and the martensite obtained in step one is decomposed into the alpha+beta tissue of faller gill shape, and a part of α faller gill there occurs certain alligatoring, 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, between the blade of α phase, only retain little residual β phase.By the insulation of step 3, the α ratio that β phase in version is certain in opposite directions, the thick sheet α obtained is attenuated, but quantity is constant, is β phase between α phase in step 2.Then air cooling, β phase in version is β
turn, global tissue defines by waiting axle α, strip of sheet α and β
turnthe tri-state tissue biphase titanium alloy of composition.This tri-state tissue homogeneity is very good, and the thickness of secondary sheet α in tissue is relatively large.The present invention, without the need to nearly β thermal distortion, does not produce the uneven heat effect of distortion, being easy to control temperature, becoming bifurcation tissue to the initial equiaxed structure of titanium alloy without the need to carrying out special pre-treatment; Heat treating method of the present invention is simple and easy to do and use range extensive, and the present invention can be applicable to rolling, extruding and the thermal treatment with the titanium alloy component of the method manufactures such as mechanical workout shaping, so that obtain tri-state tissue.Particularly for titanium alloy complex member, local complex component or large-scale component, just first can process the near net-shaped state of component by the mode of mechanical workout, then use heat treating method of the present invention to obtain tri-state tissue.In addition, after obtaining tri-state tissue, the ageing treatment in 550 ~ 650 DEG C of temperature ranges can be carried out as required to titanium alloy.
Accompanying drawing explanation
Accompanying drawing 1 is method flow diagram,
Accompanying drawing 2 to be β transition points the be original equiaxed structure figure of biphase titanium alloy of 990 DEG C,
Accompanying drawing 3 is through the biphase titanium alloy tri-state tissue figure after three step thermal treatment.
Embodiment
Embodiment one
The present embodiment is a kind of method by stove cold acquisition tri-state tissue titanium alloy, and sample used is 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 DEG C, and initial structure is equiaxed structure.
The concrete implementation step of the present embodiment is:
Step one, nearly β temperature water-cooled.
Resistance furnace is heated to the nearly β temperature of TA15 titanium alloy, namely lower than the temperature range of β transition point 10 ~ 20 DEG C.In the present embodiment, resistance furnace temperature is 975 DEG C, lower than TA15 titanium alloy beta temperature 15 DEG C.After the temperature of resistance furnace arrives 975 DEG C, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 975 DEG C and starts insulation, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; Every 1mm titanium alloy specimen cross section equivalent diameter insulation 0.6 ~ 4min.Determine that described soaking time is the standard of holding time shown in first three columns according to form 4 on HB/Z199-2005, and in the present embodiment, replace the thickness in HB/Z199-2005 with titanium alloy specimen cross section equivalent diameter.Describedly determine that cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy specimen cross section equivalent diameter is 10mm, and soaking time is 40min.After insulation terminates, in 0.2min, sample is submerged in water, by the mode of water-cooled, this sample is cooled to room temperature, makes sample tissue change into 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 β transition point 40 ~ 60 DEG C.In the present embodiment, resistance furnace temperature is 950 DEG C, lower than TA15 titanium alloy beta temperature 40 DEG C.After the temperature of resistance furnace arrives 950 DEG C, be organized as α by what obtain through step one
on axleresistance furnace put into by+martensitic titanium alloy sample.When resistance furnace be warming up to 950 DEG C start insulation, soaking time be soaking time in step one basis on increase by 30 ~ 60min.In the present embodiment, the soaking time in step 1 is 40min, and increase 30min, soaking time is 70min.After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature.Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual.
Step 3, comparatively low-temperature insulation air cooling in two-phase region.
Resistance furnace is heated to the lesser temps in TA15 titanium alloy two-phase region, namely lower than the temperature range of β transition point 90 ~ 120 DEG C, in the present embodiment, resistance furnace temperature is 900 DEG C, lower than TA15 titanium alloy beta temperature 90 DEG C.After the temperature of resistance furnace arrives 900 DEG C, be organized as α by what obtain through step 2
on axle+ α
thick silver+ β
residualtitanium alloy sample put into resistance furnace.When resistance furnace be warming up to 900 DEG C start insulation, soaking time be soaking time in step one basis on increase by 20 ~ 60min.In the present embodiment, the soaking time in step 1 is 40min, and increase 20min, soaking time is 60min.After insulation terminates, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
In the present embodiment, can be retained the primary alpha phase such as axle such as grade of about 15% in titanium alloy tissue by step one, remaining is martensite.The insulating process of step 2 makes the axle primary alpha phase that waits obtained in step one substantially keep original content and form, and the martensite obtained in step one is decomposed into the alpha+beta tissue of faller gill shape, and a part of α faller gill there occurs certain alligatoring, 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, between the blade of α phase, only retain little residual β phase.By the insulation of step 3, the α ratio that β phase in version is certain in opposite directions, the thick sheet α obtained is attenuated, but quantity is constant, is β phase between α phase in step 2.Then air cooling, β phase in version is β
turn, global tissue defines by waiting axle α, strip of sheet α and β
turnthe tri-state tissue titanium alloy of composition.Cold owing to employing stove 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 tissue homogeneity is fine.
The heat treating method flow process of the present embodiment is shown in Fig. 1, and TA15 titanium alloy prototype micro tissue is shown in Fig. 2, through the tri-state tissue of titanium alloy that obtains after three steps as shown in Figure 3.
Embodiment two
The present embodiment is a kind of method by stove cold acquisition tri-state tissue titanium alloy, and sample used is 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 DEG C, and initial structure is bifurcation tissue.
The concrete implementation step of the present embodiment is:
Step one, nearly β temperature water-cooled.Resistance furnace is heated to the nearly β temperature of TA15 titanium alloy, namely lower than the temperature range of β transition point 10 ~ 20 DEG C, in the present embodiment, resistance furnace temperature is 970 DEG C, lower than TA15 titanium alloy beta temperature 20 DEG C.After the temperature of resistance furnace arrives 970 DEG C, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 970 DEG C and starts insulation, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; The every 1mm of described titanium alloy specimen cross section equivalent diameter is incubated 0.6 ~ 4min.Determine that described soaking time is the standard of holding time shown in first three columns according to form 4 on HB/Z199-2005, and in the present embodiment, replace the thickness in HB/Z199-2005 with titanium alloy specimen cross section equivalent diameter.The described appendix A according to GJB3763A-2004 determining cross section equivalent diameter.In the present embodiment, titanium alloy specimen cross section equivalent diameter is 55mm, and soaking time is 55min.After insulation terminates, in 0.2min, sample is submerged in water, by the mode of water-cooled, this sample is cooled to room temperature, the axle α+martensitic stucture such as sample tissue is changed into.
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 β transition point 40 ~ 60 DEG C, in the present embodiment, resistance furnace temperature is 940 DEG C, lower than TA15 titanium alloy beta temperature 50 C.After resistance furnace arrives 940 DEG C, be organized as α by what obtain through step one
on axleresistance furnace put into by+martensitic titanium alloy sample.When resistance furnace be warming up to 940 DEG C start insulation, soaking time be soaking time in step one basis on increase by 30 ~ 60min.In the present embodiment, the soaking time in step 1 is 55min, and increase 45min, soaking time is 100min.After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature.Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual.
Step 3, comparatively low-temperature insulation air cooling in two-phase region.Resistance furnace is heated to the lesser temps in TA15 titanium alloy two-phase region, namely lower than the temperature range of β transition point 90 ~ 120 DEG C, in the present embodiment, resistance furnace temperature is 870 DEG C, lower than TA15 titanium alloy beta temperature 120 DEG C.After the temperature of resistance furnace arrives 870 DEG C, be organized as α by what obtain through step 2
on axle+ α
thick silver+ β
residualtitanium alloy sample put into resistance furnace.When resistance furnace be warming up to 870 DEG C start insulation, soaking time be soaking time in step one basis on increase by 20 ~ 60min.In the present embodiment, the soaking time in step 1 is 55min, and increase 30min, soaking time is 85min.After insulation terminates, 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 obtaining tri-state tissue in titanium alloy, and sample used is 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 DEG C, and initial structure is equiaxed structure.
The concrete implementation step of the present embodiment is:
Step one, nearly β temperature water-cooled.Resistance furnace is heated to the nearly β temperature of TC4 titanium alloy, namely lower than the temperature range of β transition point 10 ~ 20 DEG C, in the present embodiment, resistance furnace temperature is 975 DEG C, lower than TC4 titanium alloy beta temperature 10 DEG C.After the temperature of resistance furnace arrives 975 DEG C, cylinder sample is put into resistance furnace.Resistance furnace is warming up to 975 DEG C and starts insulation, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; The every 1mm of described titanium alloy specimen cross section equivalent diameter is incubated 0.6 ~ 4min.Determine that described soaking time is the standard of holding time shown in first three columns according to form 4 on HB/Z199-2005, and in the present embodiment, replace the thickness in HB/Z199-2005 with titanium alloy specimen cross section equivalent diameter.Describedly determine that cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy specimen cross section equivalent diameter is 30mm, and soaking time is 45min.After insulation terminates, in 0.2min, sample is submerged in water, by the mode of water-cooled, this sample is cooled to room temperature, makes sample tissue change into 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 β transition point 40 ~ 60 DEG C, in the present embodiment, resistance furnace temperature is 925 DEG C, lower than TC4 titanium alloy beta temperature 60 C.After resistance furnace arrives 925 DEG C, be organized as α by what obtain through step one
on axleresistance furnace put into by+martensitic titanium alloy sample.When resistance furnace be warming up to 925 DEG C start insulation, soaking time be soaking time in step one basis on increase by 30 ~ 60min.In the present embodiment, the soaking time in step 1 is 45min, and increase 30min, soaking time is 75min.After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature.Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual.
Step 3, comparatively low-temperature insulation air cooling in two-phase region.Resistance furnace is heated to the lesser temps in TC4 titanium alloy two-phase region, namely lower than the temperature range of β transition point 90 ~ 120 DEG C, in the present embodiment, resistance furnace temperature is 885 DEG C, lower than TA15 titanium alloy beta temperature 100 DEG C.After the temperature of resistance furnace arrives 885 DEG C, be organized as α by what obtain through step 2
on axle+ α
thick silver+ β
residualtitanium alloy sample put into resistance furnace.When resistance furnace be warming up to 885 DEG C start insulation, soaking time be soaking time in step one basis on increase by 20 ~ 60min.In the present embodiment, the soaking time in step 1 is 45min, and increase 60min, soaking time is 105min.After insulation terminates, 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 obtaining tri-state tissue in titanium alloy, and sample used is 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 DEG C, and initial structure is bifurcation tissue.
The concrete implementation step of the present embodiment is:
Step one, nearly β temperature water-cooled.Resistance furnace is heated to the nearly β temperature of TC4 titanium alloy, namely lower than the temperature range of β transition point 10 ~ 20 DEG C, in the present embodiment, resistance furnace temperature is 975 DEG C, lower than TC4 titanium alloy beta temperature 20 DEG C.After the temperature of resistance furnace arrives 975 DEG C, sample is put into resistance furnace.Resistance furnace is warming up to 975 DEG C and starts insulation, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; The every 1mm of described titanium alloy specimen cross section equivalent diameter is incubated 0.6 ~ 4min.Determine that described soaking time is the standard of holding time shown in first three columns according to form 4 on HB/Z199-2005, and in the present embodiment, replace the thickness in HB/Z199-2005 with titanium alloy specimen cross section equivalent diameter.Describedly determine that cross section equivalent diameter is the appendix A according to GJB3763A-2004.In the present embodiment, titanium alloy specimen cross section equivalent diameter is 210mm, and soaking time is 126min.After insulation terminates, in 0.2min, sample is submerged in water, by the mode of water-cooled, this sample is cooled to room temperature, makes sample tissue change into 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 β transition point 40 ~ 60 DEG C, in the present embodiment, resistance furnace temperature is 950 DEG C, lower than TC4 titanium alloy beta temperature 45 C.After resistance furnace arrives 950 DEG C, be organized as α by what obtain through step one
on axleresistance furnace put into by+martensitic titanium alloy sample.When resistance furnace be warming up to 950 DEG C start insulation, soaking time be soaking time in step one basis on increase by 30 ~ 60min.In the present embodiment, the soaking time in step 1 is 126min, and increase 60min, soaking time is 186min.After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature.Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual.
Step 3, comparatively low-temperature insulation air cooling in two-phase region.Resistance furnace is heated to the lesser temps in TC4 titanium alloy two-phase region, namely lower than the temperature range of β transition point 90 ~ 120 DEG C, in the present embodiment, resistance furnace temperature is 885 DEG C, lower than TA15 titanium alloy beta temperature 110 DEG C.After the temperature of resistance furnace arrives 885 DEG C, be organized as α by what obtain through step 2
on axle+ α
thick silver+ β
residualtitanium alloy sample put into resistance furnace.When resistance furnace be warming up to 885 DEG C start insulation, soaking time be soaking time in step one basis on increase by 20 ~ 60min.In the present embodiment, the soaking time in step 1 is 126min, and increase 50min, soaking time is 176min.After insulation terminates, take out titanium alloy sample air cooling to room temperature, reach the titanium alloy with tri-state tissue.
Claims (1)
1., by the cold method obtaining tri-state tissue in biphase titanium alloy of stove, it is characterized in that, concrete implementation step is:
Step one, nearly β temperature water-cooled;
Resistance furnace is heated to the nearly β temperature of biphase titanium alloy; Sample is put into resistance furnace; The nearly β temperature that resistance furnace is warming up to biphase titanium alloy starts insulation, and soaking time is determined according to titanium alloy specimen cross section equivalent diameter; The every 1mm of described titanium alloy specimen cross section equivalent diameter is incubated 0.6 ~ 4min; After insulation terminates, be submerged in water, by the mode of water-cooled, this sample be cooled to room temperature in 0.2min by sample, in biphase titanium alloy tissue, retain the primary alpha phase such as axle such as grade of 10% ~ 20%, remaining is martensite, makes sample tissue change into α
on axle+ martensite;
The nearly β temperature of described titanium alloy is lower than alloy β transition point 10 ~ 20 DEG C of temperature ranges;
Step 2, common two-phase region holding furnace is cold;
Resistance furnace is heated to the common two-phase region temperature of titanium alloy; After resistance furnace arrives the common two-phase region temperature of titanium alloy, be organized as α by what obtain
on axleresistance furnace put into by+martensitic titanium alloy sample; Insulation is started when resistance furnace is warming up to the common two-phase region temperature of titanium alloy, soaking time be soaking time in step one basis on increase by 30 ~ 60min, the axle primary alpha phase that waits obtained keeps original content and form substantially, and the martensite obtained is decomposed into the alpha+beta tissue of faller gill shape; After insulation terminates, make resistance furnace stop heating, titanium alloy assay furnace is as cold as room temperature, makes α sheet generation alligatoring, because inhibition is played in the growth of sheet α equity axle α, wait axle α obviously not grow up in the cold process of stove; After cool to room temperature, between the blade of α phase, only retain a small amount of residual β phase; Sample tissue is made to change into α
on axle+ α
thick silver+ β
residual; The common two-phase region temperature of described titanium alloy is the temperature range lower than β transition point 40 ~ 60 DEG C;
Step 3, comparatively low-temperature insulation air cooling in two-phase region;
Resistance furnace is heated to the lesser temps in titanium alloy two-phase region; After the temperature of resistance furnace arrives the lesser temps in titanium alloy two-phase region, be organized as α by what obtain
on axle+ α
thick silver+ β
residualtitanium alloy sample put into resistance furnace; Resistance furnace starts insulation when being warming up to the lesser temps in titanium alloy two-phase region, soaking time be soaking time in step one basis on increase by 20 ~ 60min, α β phase in version in opposite directions, the thick sheet α obtained in step 2 is attenuated, but quantity is constant, be β phase between α phase; After insulation terminates, take out titanium alloy sample air cooling to room temperature, β phase in version is β
turn, global tissue defines by waiting axle α, strip of sheet α and β
turnthe tri-state tissue biphase titanium alloy of composition; Obtain the titanium alloy with tri-state tissue; Lesser temps in described titanium alloy two-phase region is the temperature range lower than β transition point 90 ~ 120 DEG C.
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| CN105088120B (en) * | 2014-05-08 | 2017-02-15 | 中国科学院金属研究所 | Widmannstatten structure titanium alloy with composite laminated structure and preparation method thereof |
| CN104931315A (en) * | 2015-06-05 | 2015-09-23 | 中国航空工业集团公司北京航空材料研究院 | Method for testing nonuniformity of titanium alloy low power tissue |
| CN109371347A (en) * | 2018-12-11 | 2019-02-22 | 陕西宏远航空锻造有限责任公司 | A kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging |
| CN113275600B (en) * | 2021-05-17 | 2022-06-07 | 北京科技大学 | Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy |
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| RU2007100129A (en) * | 2004-06-10 | 2008-07-27 | Хаумет Корпорейшн (Us) | THERMAL PROCESSED CASTING FROM ALMOST BETA-ALLOY OF TITANIUM |
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