CN107916384B - It is a kind of to improve Ti80 titanium alloy even tissue refinement forging method using flat-die hammer - Google Patents
It is a kind of to improve Ti80 titanium alloy even tissue refinement forging method using flat-die hammer Download PDFInfo
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- CN107916384B CN107916384B CN201710522905.9A CN201710522905A CN107916384B CN 107916384 B CN107916384 B CN 107916384B CN 201710522905 A CN201710522905 A CN 201710522905A CN 107916384 B CN107916384 B CN 107916384B
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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
Abstract
Ti80 titanium alloy even tissue refinement forging method is improved using flat-die hammer the present invention relates to a kind of, step 1: heating in gas furnace, forging temperature is T in transformation temperatureβ+ 150 DEG C of β of+100 DEG C~T；Step 2: being heated in gas furnace, forging temperature is+70 DEG C of T β~+80 DEG C of T β in transformation temperature；Step 3: being heated in electric furnace, forging temperature is+30 DEG C of β of+20 DEG C~T of transformation temperature T β；Step 4: being heated in electric furnace, forging temperature is+5 DEG C of T β~+10 DEG C of T β under transformation temperature；Step 5: being heated in electric furnace, forging temperature is β -15 DEG C of T~β -25 DEG C of T under transformation temperature；Step 6: being heated in electric furnace, forging temperature is β -15 DEG C of T~β -25 DEG C of T under transformation temperature.Ti80 changes above rule forging technology scheme used when forging and obtains typical equiaxed structure, is dispersed with isometric α phase on transformed β matrix, isometric α phase content reaches 80% or more, and isometry degree is preferable.
Description
Technical field
The present invention relates to a kind of forging method of raising Ti80 titanium alloy even tissue refinement, the titanium alloy processed has
The new titanium alloy material of high-intensitive, strong corrosivity and good welding performance, belongs to materials hot working field.
Background technique
Ti80 is a kind of aluminium content higher (5.5%~6.5%) and containing the close of beta stable element NbMo and neutral element Zr
Alpha titanium alloy, nominal composition Ti-6Al--3Nb--2Zr-1Mo, the alloy is with high-intensitive, strong corrosivity and well
Welding performance the advantages of, thus be widely used in the stress members of submarine and underawater ordnance, bolt, axis and corrosion-resistant
Shell；
Usual Ti80 material is domestic 210 ingot casting bar of Φ, and smelting process is VAR melting, and melting number is 3 times.Casting
Ingot coarse grains, nonuniform organization, mirco structure photo as shown in Figure 1, and plasticity it is poor, forging deformation amount is limited, and tissue is not
Easily improve.Corner angle are cooling very fast in forging process, and plastic deformation ability is relatively worse.Ti80 as-cast grain is coarse, and plasticity is poor,
10 μm of small grains below, nonuniform organization are obtained, is not only limited by forging deformation amount, also often there is biggish forging
Crackle generates；The control of the heating and deformation process made to Ti80 as cast condition in the free hammering of 3T is the difficult point of material production, right
Interior tissue and performance have important influence.General forging method is difficult to meet the above-mentioned organizational requirements of forging.
Summary of the invention
The technical problems to be solved by the present invention are: a kind of forging method for improving Ti80 titanium alloy structure property is provided,
It obtains 10 μm of small grains, even tissue, the good high-intensitive, high-ductility of plasticity and high-fracture toughness below while improving Ti80
The tissue reliability of titanium alloy member.
The technical solution that the present invention takes,
The key that titanium alloy changes forging has at 3 points, accurate transformation temperature, appropriate heating parameters, the control of forging process deflection
System.The technical process that the present invention uses Ti80 ingot casting are as follows: ingot formation → inspection high-low time tissue → is forged into
Type → inspection mirco structure.
A kind of to improve Ti80 titanium alloy even tissue refinement forging method using flat-die hammer, steps are as follows for specific forging:
Step 1: being heated in gas furnace, forging temperature is T in transformation temperatureβ+ 150 DEG C of β of+100 DEG C~T, heating coefficient is
0.4~1.0min/mm, jumping-up pulling number are that three upsettings three are pulled out, and forging deformation amount is 15%~45%, and forging time is less than 1.5
~5min；Blank transfer time is less than or equal to 30 seconds；
Step 2: being heated in gas furnace, forging temperature is+70 DEG C of T β~+80 DEG C of T β in transformation temperature, heating coefficient 0.4
~1.0min/mm, jumping-up pulling number are that three upsettings three are pulled out, and forging deformation amount is 15%~40%, forging time less than 1.5~
5min；Blank transfer time is less than or equal to 30 seconds；
Step 3: electric furnace heat, forging temperature be+30 DEG C of β of+20 DEG C~T of transformation temperature T β, heating coefficient be 0.4~
1.0min/mm, jumping-up pulling number are that two upsettings two are pulled out, and forging deformation amount is 15%~35%, forging time less than 1.5~
5min；Blank transfer time is less than or equal to 30 seconds；
Step 4: electric furnace heat, forging temperature be transformation temperature under+5 DEG C of T β~+10 DEG C of T β, heating coefficient be 0.4~
1.0min/mm, jumping-up pulling number are that two upsettings two are pulled out, and forging deformation amount is 15%~35%, forging time less than 1.5~
5min；Blank transfer time is less than or equal to 30 seconds；
Step 5: electric furnace heat, forging temperature be transformation temperature under β -15 DEG C of T~β -25 DEG C of T, heating coefficient be 0.4~
1.0min/mm, jumping-up pulling number are that two upsettings two are pulled out, and forging deformation amount is 15%~30%, forging time less than 1.5~
5min；Blank transfer time is less than or equal to 30 seconds；
Step 6: electric furnace heat, forging temperature be transformation temperature under β -15 DEG C of T~β -25 DEG C of T, heating coefficient be 0.4~
1.0min/mm, jumping-up pulling number are that two upsettings two are pulled out, and forging deformation amount is 15%~30%, forging time less than 1.5~
5min；Blank transfer time is less than or equal to 30 seconds.
The technical effect of invention: above scheme is by β matrix and to be distributed on β matrix thick to microscopic structure after Ti80 cogging
Big strip α is constituted, and original coarse strip α is sufficiently broken in the microscopic structure after changing forging, and at α particle, tissue is equal for nodularization
It is even tiny, crystallite dimension≤10 μm.Ti80 changes above rule forging technology scheme used when forging and obtains typical equiaxed structure,
Isometric α phase is dispersed on transformed β matrix, isometric α phase content reaches 80% or more, and isometry degree is preferable.
Detailed description of the invention
Fig. 1 is the metallographic microscope before the forging of Ti80 titanium alloy blank
Fig. 2 is the metallographic microscope after the forging of Ti80 titanium alloy blank
Specific embodiment
It is 210 × 280/43kg of Φ to Ti80 specification；Transformation temperature are as follows: 1010 DEG C；The Ti80 of tissue such as Fig. 1 is heated in electric furnace
After change forging as follows:
Step 1: 150 DEG C × 125min in transformation temperature, three upsettings three are pulled out
210 × 280 jumping-ups of Φ~255 × 190 ± 10 pullings of Φ~Φ 180 × 300 ± 10
215 × 210 ± 10 chamfering pulling of jumping-up~Φ~175 × 310 ± 10 jumping-up of Φ~
The commutation of Φ 215 × 210 ± 10 is pulled out to six sides~Φ 175 × 310 ± 10
If visible micro-crack occurs in ※, stops forging immediately and melt down
Step 2: 80 DEG C × 110min in transformation temperature, three upsettings three are pulled out
175 × 310 jumping-ups of Φ~215 × 210 ± 10 pullings of Φ~Φ 175 × 310 ± 10
215 × 210 ± 10 chamfering pulling of jumping-up~Φ~Φ 175 × 310 ± 10
The commutation of jumping-up~Φ 215 × 210 ± 10 is pulled out to six sides~Φ 175 × 310 ± 10
Step 3: 30 DEG C × 110min in transformation temperature, two upsettings two are pulled out
175 × 310 jumping-ups of Φ~Φ, 215 × 210 ± 10 chamfering pulling~Φ 175 × 310 ± 10
The commutation of jumping-up~Φ 215 × 210 ± 10 is pulled out to six sides~Φ 175 × 310 ± 10
Step 4:: 5 DEG C × 110min in transformation temperature, two upsettings two are pulled out
175 × 310 jumping-ups of Φ~Φ, 215 × 210 ± 10 chamfering pulling~Φ 175 × 310 ± 10
The commutation of jumping-up~Φ 215 × 210 ± 10 is pulled out to six sides~Φ 175 × 310 ± 10
Step 5:: the lower 15 DEG C × 110min of transformation temperature
175 × 310 jumping-ups of Φ~Φ, 215 × 210 ± 10 chamfering pulling~Φ 175 × 310 ± 10
The commutation of jumping-up~Φ 185 × 275 ± 10 is pulled out to~Φ 130 × 560 ± 10
Step 6: the lower 15 DEG C × 80min of transformation temperature
Φ 130 × 560 is axial to be pulled out to~Φ 100 × 940 ± 10
Chop material: dividing equally be chopped into 4 along its length, single-piece size :~Φ 100 ×~225
Physico-chemical examination high power such as Fig. 2 obtains uniformly tiny tissue, and crystal grain≤10 μm, which meet, compares standard requirements.
Claims (4)
1. a kind of improve Ti80 titanium alloy even tissue refinement forging method using flat-die hammer, which is characterized in that specific forging
Steps are as follows: step 1: heating in furnace, forging temperature is T in transformation temperatureβ+ 150 DEG C of β of+100 DEG C~T, heating coefficient 0.4
~1.0min/mm, jumping-up pulling number are that three upsettings three are pulled out, and forging deformation amount is 15%~45%；Step 2: heating, forge in furnace
Making temperature is+70 DEG C of T β~+80 DEG C of T β in transformation temperature, and heating coefficient is 0.4~1.0min/mm, and it is three upsettings that jumping-up, which pulls out number,
Three pull out, and forging deformation amount is 15%~40%；Step 3: being heated in furnace, forging temperature is+20 DEG C~T of transformation temperature T β β+30
DEG C, heating coefficient is 0.4~1.0min/mm, and jumping-up pulling number is that two upsettings two are pulled out, and forging deformation amount is 15%~35%；Step
Rapid 4: being heated in furnace, forging temperature is+5 DEG C of T β~+10 DEG C of T β under transformation temperature, and heating coefficient is 0.4~1.0min/mm, upsetting
Thick pulling number is that two upsettings two are pulled out, and forging deformation amount is 15%~35%；Step 5: being heated in furnace, forging temperature is transformation temperature
Lower β -15 DEG C of T~β -25 DEG C of T, heating coefficient are 0.4~1.0min/mm, and jumping-up pulling number is that two upsettings two are pulled out, forging deformation amount
It is 15%~30%；Step 6: being heated in furnace, forging temperature is β -15 DEG C of T~β -25 DEG C of T under transformation temperature, and heating coefficient is
0.4~1.0min/mm, jumping-up pulling number are that two upsettings two are pulled out, and forging deformation amount is 15%~30%.
2. forging method as described in claim 1, which is characterized in that the forging time of step 1-6 is less than 1.5~5min.
3. the transfer time of blank is less than or equal to 30 seconds in step 1-6 as described in claim 1.
4. forging method as described in claim 1, which is characterized in that step 1-2 is heated with gas furnace, and step 2-6 is
Electricity consumption stove heating.
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| CN108754371B (en) * | 2018-05-24 | 2020-07-17 | 太原理工大学 | Preparation method of refined α -close high-temperature titanium alloy grains |
| CN110076533B (en) * | 2019-05-24 | 2021-11-02 | 宝鸡拓普达钛业有限公司 | Preparation method of TC4 step shaft applied to petroleum lubricator |
| CN111230012B (en) * | 2020-02-28 | 2021-12-28 | 西北工业大学 | Forging method of Ti80 titanium alloy |
| CN112226711B (en) * | 2020-09-02 | 2022-04-19 | 宁夏中色金航钛业有限公司 | Forging method for improving structural uniformity of Ti80 alloy bar for ocean engineering |
| CN112139413A (en) * | 2020-09-04 | 2020-12-29 | 中国航发北京航空材料研究院 | Forging method for improving texture and texture uniformity of TC18 titanium alloy large-size bar |
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