CN101328567B - Double electron beam partial heat treatment method after refractory metal material is welded - Google Patents
Double electron beam partial heat treatment method after refractory metal material is welded Download PDFInfo
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- CN101328567B CN101328567B CN2008101345314A CN200810134531A CN101328567B CN 101328567 B CN101328567 B CN 101328567B CN 2008101345314 A CN2008101345314 A CN 2008101345314A CN 200810134531 A CN200810134531 A CN 200810134531A CN 101328567 B CN101328567 B CN 101328567B
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- 238000010894 electron beam technology Methods 0.000 title claims abstract description 76
- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
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- 239000000463 material Substances 0.000 title claims description 8
- 239000003870 refractory metal Substances 0.000 title 1
- 238000003466 welding Methods 0.000 claims abstract description 54
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 17
- 238000007669 thermal treatment Methods 0.000 claims description 45
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Abstract
The invention belongs to a high-energy beam heat treatment technology which is suitable for the postweld dual heat treatment on the electron beam welding structures of various titanium alloys and high-temperature alloy materials. The invention relates to a postweld dual electron beam local heat treatment method for a high-temperature resistant metal material. The method improves an electron beam local heat treatment temperature, enlarges an application range of the technology and can realize the multiple heat treatment processing of parts; the electron beam welding and the dual electron beam local heat treatment integrated processing after the welding are completed in one vacuum cycle, thereby improving production efficiency, being clean and energy-saving and saving cost; the method can solve the actual problem that the electron beam of a high-temperature titanium alloy engine member can not be subjected to whole heat treatment and improve tissue performance of a connector and lastingperformance of the connector.
Description
Technical field
The invention belongs to a kind of high energy beam heat treatment technics, be applicable to electrons leaves welding structures such as various high-temperature titanium alloys, high temperature alloy, relate to a kind of high-temperature titanium alloy postwelding double electron beam partial heat treatment method.
Background technology
Compare with traditional fusion welding method, electrons leaves welding has the energy density height, the welding efficiency height, weld seam is narrow, depth-to-width ratio is big, be out of shape little, advantage such as welding surroundings is good, and Technological adaptability is strong.Therefore, be widely used in high-tech military fields such as Aeronautics and Astronautics, weaponry manufacturing and nuclear industry, and expanded in a plurality of civilian industries such as electronics, chemical industry, automobile, electric power and mining machinery; Except traditional metal materials, electrons leaves welding is mainly used in the processing of multiple novel materials such as titanium alloy, superalloy, Al-Li alloy and high-strength steel.Because melting welding inherent characteristics, there is the martensitic stucture of as cast condition in the weld metal zone and the higher residual tension that distributes, and therefore, postwelding adopts heat treated mode to improve joint stress distribution and structure property.The thermal treatment of postwelding electron beam partial is to utilize the electron beam scanning heating that defocuses to comprise the regional area realization thermal treatment of weld seam.Along with the widespread use of electron beam welding technology, the electron beam welding postheat treatment has caused engineering technical personnel's concern.
For titanium alloy material, studies show that postwelding electron beam partial annealing thermal treatment can improve joint stress distribution and fatigue property.For engine pack high-temperature titanium alloy material, adopt the dual heat treating method of solid solution+annealing to improve joint microstructure and stress distribution after the electrons leaves welding, improve mechanical properties such as joint is lasting; Because problem restrictions such as actual parts size precision height, high temperature resistant jig Design are difficult to and the postweld heat treatment timed interval is short, overall vacuum furnace treatment reason can't satisfy service requirements.
At present, high-temperature titanium alloy, high temperature alloy electrons leaves welding postheat treatment method have: (1) vacuum or antivacuum stove complete heat treatment (comprising annealing, the solid solution+dual thermal treatment of annealing); (2) electron beam partial thermal treatment (single annealing, single tempering).
The Russia scholar is when the titanium alloy joint is cooled to 25 ℃ behind electron beam welding, adopts the electron beam that defocuses along the weld seam scanning thermal treatment of annealing; The line sweep waveform is a zig-zag, heating dot width: B1=B (weld seam is wide)+1～2mm; The temperature of root of weld heat-treatment zone is 750～800 ℃, and heat treatment time changed at 40 seconds～3 minutes; The joint shock strength obviously improves after the partial heat treatment.(Lysenkov Yu T.Improving the properties of welded joints in a BT20 alloyby the local heat treatment with an electron beam[J] .WeldingProdution, 1980,4:7～8) after titanium alloy and the high-strength steel electron beam partial annealing thermal treatment, the peak value of electro-beam welding joint stretching unrelieved stress peak value and hydrogen richness obviously reduces, and tensile strength, stretching retrospective and impelling strength have reached the level of complete heat treatment.(Lysenkov?Yu?T，Feoktistova?E?M.Electron?beam?welding?and?zone?heat?treatment?of?weldedjoints?in?titanium?alloys?and?high?strength?steels[J].WeldingInternational，1994，8(8)：646～648.)
The scholar in Taiwan was doing a few thing aspect the thermal treatment of postwelding electron beam partial in recent years.Scholars such as Wang chien chun carry out the electron beam partial annealing thermal treatment of low-heat input at once after electrons leaves welding; Adopt micro-processor controlled point by point scanning mode to scan, scanning area width, sweep velocity and hot input can be adjusted.(Wang Chien2Chun, Chang Yin.Effect postweldtreatment on the fatigue crack growth rate of electron beam weldedAISI4130[J] .Metallurgical Materials Transactions A, 1996, (27A): 3162～3169) scholar such as T.Sebastiano is scanned by the rectangular electron beam spot and is finished electron beam partial thermal treatment, obviously reduce weld seam and heat affected zone microhardness value, improved the fracture toughness property of joint.(Sebatino?T，Fabiao?N.Electron?beam?welding?and?post?weld?treatments?ofsteels[J].Journal?of?Materials?Science?Letters，1996，15：827～830.)
The vacuum oven complete heat treatment needs strict control to be welded to the timed interval of postweld heat treatment; For high-temperature titanium alloy, superalloy thin-walled parts, when the thermal treatment temp of having relatively high expectations, need high temperature resistant anchor clamps of design and strict process control means, to guarantee the dimensional precision of part.Therefore, the application of vacuum complete heat treatment has been subjected to certain limitation.
At present, the thermal treatment of postwelding electron beam partial is mainly spot anneling or localized tempering thermal treatment, adopts the mode of scan round heating to see Fig. 1, i.e. defocus(s)ed beam 1 scanning heating comprises the regional area 4 of weld seam 2, test plate (panel) 5 iterative motions.Be subjected to movement velocity and factor affecting such as heat input coupling, metal fever heat loss through conduction, thermal treatment zone 3 temperature lower (below 900 ℃), the thermal treatment uniform temperature is relatively poor, can't satisfy the electron beam thermal treatment of solid solubility temperature.
Summary of the invention
The purpose of this invention is to provide a kind of high-temperature titanium alloy, superalloy electro-beam welding joint structure property is good, the high-temperature titanium alloy postwelding double electron beam partial heat treatment method that enduring quality is high.
Technical scheme of the present invention is,
One, builds double electron beam partial thermal treatment process platform
(1) temp measuring system is set up
Adopt argon arc welding and resistance spot welding that thermopair is welded in the test plate (panel) back side apart from the weld seam center less than the 10mm place, thermopair is connected on the moisture recorder real time record test position temperature variation by compensating lead wire; By the optics temperature measurer test plate (panel) upper surface thermal treatment zone temperature field is monitored in real time;
(2) optimize scanning system
By microcomputer control high frequency sweep coil, adjust scan mode, scanning area dot matrix and long-sweep time, the regional area that comprises weld seam is done electron beam scanning thermal treatment, and scanning area reaches more than 5: 1 along welding bead length direction and vertical weld width ratio;
Two, double electron beam partial thermal treatment
(1) electrons leaves welding
Wire brush welds in vacuum electron beam welder after removing the material surface oxide film.The electrons leaves welding parameter: rifle is apart from workpiece surface distance H=300～800mm, acceleration voltage U
a=60～150kV, line I
f=20～100mA, welding speed V=600～1000mm/min, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, the fully dark burn through of test specimen is saturating;
(2) electron beam partial solution heat treatment
Under as-welded vacuum environment, keep 2～5min behind the electron beam welding, adopt the rectangular scanning mode, in scanning system, set scanning area dot matrix, long-sweep time, transmitter-receiver spacing workpiece distance, the gated sweep system reaches more than 5: 1 along the scanning distance of the welding bead length direction scanning distance ratio with the vertical weld width, makes the electron beam plane heat source cover the whole piece weld seam by the high frequency beat; Increase line to 20～50mA, make test specimen be warmed up to 980 ℃～1120 ℃ rapidly; Reduce line to 27～15mA again, insulation 5～10min; Close line, make test specimen under vacuum environment, be cooled to 600 ℃;
(3) electron beam partial annealing thermal treatment
Solid solution is cooled to the line rectangular scanning mode that adopts after 600 ℃ in (2), increases line to 8～15mA and carries out the second yukon bundle spot anneling thermal treatment: be warming up to 700～800 ℃, adjust and reduce line to 10～8mA, insulation 10～15min; Reduce line slow cooling to 300 ℃, close line;
The scanning area dot matrix of setting in the described scanning system is that 1000S, transmitter-receiver spacing workpiece distance are 300～500mm greater than 5000 points, long-sweep time.
The beneficial effect that the present invention has,
The present invention has improved the electron beam partial thermal treatment temp, has expanded the The Application of Technology scope, can realize the multiple heat processing of part; Electrons leaves welding and electron beam partial heat treatment time can avoid easily splitting the cracking probability of material at interval; In the vacuum cycle, finish the integrated processing of the multiple electron beam partial thermal treatment of electrons leaves welding and postwelding, improved production efficiency, clean energy-saving is saved cost; Solve behind the electron beam welding of engine pack high-temperature titanium alloy can't complete heat treatment practical problems, improve the tissue and the residual stress distribution of joint, improve the lasting and fatigue mechanics performance of joint, for the development of high precision part structure provides tachnical storage and technical guarantee; Can be used for the field of manufacturing again of design of part, the heat treatment mode as part after the REPAIR WELDING increases the service life; Both can satisfy the partial heat treatment demand of baroque heavy parts, and can realize the welding and the postweld heat treatment production of many kinds part short run again; To become a kind of useful of complete heat treatment replenishes.
Description of drawings
Fig. 1 is a prior art scan mode synoptic diagram;
Fig. 2 is a scan mode synoptic diagram of the present invention;
Fig. 3 is the effect curve figure of the embodiment of the invention one;
Fig. 4 is the effect curve figure of the embodiment of the invention three.
Embodiment
Heat treatment process is,
1. build double electron beam partial thermal treatment process platform
(1) temp measuring system is set up
See shown in Figure 2ly, adopt argon arc welding and resistance spot welding that thermopair 6 is welded in test plate (panel) 7 weld seams 8 back sides, be connected on the moisture recorder real time record test position temperature variation by compensating lead wire; Adopt the optics temperature measurer test plate (panel) surface to be carried out the monitoring in temperature field.
(2) optimize scanning system and technology
By microcomputer control high frequency sweep coil 1, see shown in Figure 2, adjustment comprises parameters such as scan mode (circle, rectangle, pentagram, annular etc.), scanning area dot matrix and long-sweep time, make electron beam gun 2 produce 3, the electron beam of 4 positions, realize the electron beam scanning thermal treatment in local big zone 5, scanning area 5 reaches more than 5: 1 along weld seam 6 length directions and vertical weld width ratio.
2. the double electron beam partial thermal treatment process is implemented
(1) electrons leaves welding
Wire brush welds in electron beam welding machine after removing the material surface oxide film, adopt dull and stereotyped built-up welding mode to weld welding setting: acceleration voltage 60～150kV, line 20～100mA, welding speed 600～1000mm/min, rifle are apart from workpiece surface distance H=300～800mm, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, the fully dark burn through of test specimen is saturating.
(2) electron beam partial solution heat treatment
Under as-welded vacuum environment, keep 2～5min behind the electron beam welding, adopt the rectangular scanning mode, set scanning lattice more than 5000, long-sweep time 1000s, transmitter-receiver spacing workpiece distance 300～500mm, the gated sweep system realizes novel line scanning motion mode as shown in Figure 2, electron beam high frequency beat limit position between 3 and 4, realization is finished and is comprised the yukon bundle solution heat treatment of weld seam at the regional area of interior (25～30) mm * (100～300) mm: increase line to 20～50mA, make test specimen be warmed up to 980 ℃～1120 ℃ rapidly; Reduce line to 30～15mA again, insulation 5～10min; Close line, make test specimen under vacuum environment, be cooled to 600 ℃;
(3) electron beam partial annealing thermal treatment
Solution heat treatment is cooled to the line beat scan mode that adopts after 600 ℃ in above-mentioned (2), increases electric current to 8～15mA and carries out the second yukon bundle spot anneling thermal treatment: be warming up to 700～800 ℃, adjust line to 10～8mA, insulation 10～15min; Reduce line slow cooling to 300 ℃, close line.
Embodiment one
Choose and be of a size of 100 * 80 * 6mm plate:
(1) electro-beam welding process:
Parameter: acceleration voltage U
a=60kV, line I
b=41mA, focusing current I
f=772mA, welding speed V=800mm/min, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, rifle are apart from workpiece surface distance H=300mm.
(2) electron beam partial solution heat treatment:
Adjust the electron beam gun motor system, make transmitter-receiver spacing workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line: heat temperature raising maximum beam I
Bmax=26mA, thermal treatment holding stage line I
b=20mA, focusing current I
f=797mA, scanning area: vertical weld direction length Y=25mm, along bead direction length X=130mm.By optics temperature measurer monitoring solution heat treatment process test specimen hot face temperature T
Smax=1120 ℃, the electron beam partial solution heat treatment is 980 ℃ of insulation 8min, shown in Fig. 3 thermal cycling curve.
(3) electron beam partial annealing thermal treatment
Solution heat treatment postcooling to 600 ℃, retaining coil is apart from the workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line I
b=11mA, focusing current I
f=797mA, scanning area: vertical weld direction length Y=25mm, along bead direction length X=130mm.Annealing process hot face temperature T
Smax=800 ℃, realized the electron beam partial annealing thermal treatment of 750 ℃ of insulation 10min, shown in Fig. 3 thermal cycling curve.
Embodiment two
Choose and be of a size of 100 * 80 * 6mm plate:
(1) electro-beam welding process:
Parameter: acceleration voltage U
a=60kV, line I
b=41mA, focusing current I
f=770mA, welding speed V=800mm/min, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, rifle is apart from workpiece surface distance H=300mm.
(2) electron beam partial solution heat treatment:
Adjust the electron beam gun motor system, make transmitter-receiver spacing workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line: heat temperature raising maximum beam I
Bmax=22mA, thermal treatment holding stage line I
b=18mA, focusing current I
f=795mA, scanning area: along vertical weld direction length Y=25mm, along bead direction length X=130mm.
Solution heat treatment process test specimen upper surface top temperature T
Smax=1100 ℃, the electron beam partial solution heat treatment is 980 ℃ of insulation 8min.
(3) electron beam partial annealing thermal treatment
Solution heat treatment is cooled to 600 ℃, and retaining coil is apart from the workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line I
b=10mA, focusing current I
f=795mA, scanning area: vertical weld direction length Y=25mm, along bead direction length X=130mm.Annealing process hot face temperature T
Smax=800 ℃, realized the electron beam partial annealing thermal treatment of 750 ℃ of insulation 10min.
Embodiment three
Choose the plate that is of a size of 100 * 80 * 14mm
(1) weldprocedure:
Parameter: acceleration voltage U
a=60kV, line I
b=86mA, focusing current I
f=772mA, welding speed V=800mm/min, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, rifle are apart from workpiece surface distance H=300mm.
(2) electron beam partial solution heat treatment:
Adjust the electron beam gun motor system, make transmitter-receiver spacing workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line: heat temperature raising maximum beam I
Bmax=40mA, thermal treatment holding stage line I
b=27mA, focusing current I
f=797mA, scanning area: vertical weld direction length Y=25mm, along bead direction length X=130mm.Test specimen hot face temperature T
Smax=1120 ℃, realized the electron beam partial solution heat treatment of 980 ℃ of insulation 10min, shown in Fig. 4 thermal cycling curve.
(3) electron beam partial annealing thermal treatment
Solution heat treatment postcooling to 600 ℃, retaining coil is apart from the workpiece distance H
r=449mm; Acceleration voltage U
a=60kV, line I
b=12mA, focusing current I
f=797mA, scanning area: vertical weld direction length Y=25mm, along bead direction length X=130mm.Annealing process hot face temperature T
Smax=800 ℃, realized the electron beam partial annealing thermal treatment of 750 ℃ of insulation 6min, shown in Fig. 4 thermal cycling curve.
The electron beam partial solution heat treatment temperature has all reached the as-welded martensite decomposition temperature of expection in the foregoing description, and complete destressing thermal treatment temp has been satisfied in electron beam partial annealing, can improve seam organization and stressed condition.
Claims (2)
1. high-temperature titanium alloy postwelding double electron beam partial heat treatment method, its heat treating method be,
One, builds double electron beam partial thermal treatment process platform
(1) temp measuring system is set up
Adopt argon arc welding and resistance spot welding that thermopair is welded in the test plate (panel) back side apart from the weld seam center less than the 10mm place, thermopair is connected on the moisture recorder temperature variation of real time record test position by compensating lead wire; By the optics temperature measurer test plate (panel) upper surface thermal treatment zone temperature field is monitored in real time;
(2) optimize scanning system
By microcomputer control high frequency sweep coil, adjust scan mode, scanning area dot matrix and long-sweep time, the regional area that comprises weld seam is done electron beam scanning thermal treatment, and scanning area reaches more than 5: 1 along the ratio of welding bead length direction with the vertical weld width;
Two, double electron beam partial thermal treatment
(1) electrons leaves welding
Wire brush welds the electrons leaves welding parameter after removing the material surface oxide film in vacuum electron beam welder: acceleration voltage U
a=60～150kV, line I
f=20～100mA, welding speed V=600～1000mm/min, rifle is apart from workpiece surface distance H=300～800mm, vacuum tightness 3 * 10
-2～8 * 10
-2Pa, the fully dark burn through of test specimen is saturating;
(2) electron beam partial solution heat treatment
Under as-welded vacuum environment, keep 2～5min behind the electron beam welding, adopt the rectangular scanning mode, in scanning system, set scanning area dot matrix, long-sweep time, transmitter-receiver spacing workpiece distance, the gated sweep system reaches more than 5: 1 along the scanning distance of the welding bead length direction scanning distance ratio with the vertical weld width, makes the electron beam plane heat source cover the whole piece weld seam by the high frequency beat; Increase line to 20～50mA, make test specimen be warmed up to 980 ℃～1120 ℃ rapidly; Reduce line to 27～15mA again, insulation 5～10min; Close line, make test specimen under vacuum environment, be cooled to 600 ℃;
(3) electron beam partial annealing thermal treatment
Adopt the line rectangular scanning mode in (2), increase line to 8～15mA and carry out the second yukon bundle spot anneling thermal treatment: be warming up to 700～800 ℃, adjust and reduce line to 10～8mA, insulation 10～15min; Reduce line slow cooling to 300 ℃, close line.
2. high-temperature titanium alloy postwelding double electron beam partial heat treatment method according to claim 1, it is characterized in that the described scanning area dot matrix of setting is that 1000s, transmitter-receiver spacing workpiece distance are 300～500mm greater than 5000 points, long-sweep time in scanning system.
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2008
- 2008-07-28 CN CN2008101345314A patent/CN101328567B/en active Active
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| RU2716926C1 (en) * | 2019-10-28 | 2020-03-17 | Федеральное государственное бюджетное учреждение науки Институт физики прочности и материаловедения Сибирского отделения Российской академии наук (ИФПМ СО РАН) | Method for complex strengthening treatment of article from titanium alloy ti-6al-4v produced by additive production method |
| RU2737187C1 (en) * | 2020-04-03 | 2020-11-25 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Method of producing welded seam by electron-beam welding of parts from titanium alloys |
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