CN104475960B - A kind of iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means - Google Patents
A kind of iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means Download PDFInfo
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- CN104475960B CN104475960B CN201410598114.0A CN201410598114A CN104475960B CN 104475960 B CN104475960 B CN 104475960B CN 201410598114 A CN201410598114 A CN 201410598114A CN 104475960 B CN104475960 B CN 104475960B
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- 238000003466 welding Methods 0.000 title claims abstract description 156
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 72
- 239000000956 alloy Substances 0.000 title claims abstract description 72
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000010894 electron beam technology Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 19
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 6
- 239000002244 precipitate Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 23
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000005202 decontamination Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 26
- 239000002184 metal Substances 0.000 abstract description 26
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 230000007547 defect Effects 0.000 description 8
- 239000010936 titanium Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 239000000470 constituent Substances 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000003032 molecular docking Methods 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 210000001215 vagina Anatomy 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0033—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/0053—Seam welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The present invention relates to iron nickel base alloy welding field, specifically a kind of ferrum Ni-based precipitate strengthened austenite alloys (J75) joint heat affected area grain boundary liquation crack controlling means, solves iron nickel base alloy joint in prior art and is easily formed wider lean γ ' district and the problem of grain boundary liquation crackle.Using vacuum electron beam welding, its technological process is: the single cycle welding → postwelding of the built-in clamping fixed → welding booth's evacuation → positioning welding of mother metal pre-welding treatment → vacuum welding chamber → having electronic beam steering scanning is modified welding → postwelding electron beam and defocused the process route of scanning weld seam.Using the iron nickel base alloy joint of present invention welding, joint heat affected area is formed without lean γ ' district and grain boundary liquation crackle.The iron nickel base alloy joint surface of the inventive method welding shapes, strength of joint at more than 980MPa, even up to more than 1030MPa, with the strength factor of mother metal up to more than 0.9, joint impact toughness αkUAt 980KJ/m2Above, even up to 1020KJ/m2Above.
Description
Technical field
The present invention relates to iron nickel base alloy welding field, specifically a kind of ferrum Ni-based precipitation strength austenite closes
Gold (J75) joint heat affected area grain boundary liquation crack controlling means.
Background technology
Along with the development of the high-tech area such as Aeronautics and Astronautics and nuclear energy uses, material therefor and device are proposed
Higher requirement.Due to low strength, such as: 304, the single phase austenite rustless steels such as 310,316 and 316L
It is unsatisfactory for the use requirement of every field.Precipitation strength type austenitic stainless steel is at single phase austenite rustless steel
On the basis of, being grown up by the alloying of the elements such as Ti, Al, such alloy uses under aging state, logical
Cross to separate out, with matrix, there is the hardening constituent γ '-Ni of symbiosis and epibiosis3(Al, Ti) obtains high intensity and good plasticity coupling.Should
The high-intensity source of class alloy is in the hardening constituent γ '-Ni with matrix with symbiosis and epibiosis3(Al, Ti), typical alloy such as:
Domestic J75 alloy.
When Aeronautics and Astronautics, chemical industry and energy field use as structural material, inevitably run into connection
Problem.Should be mentioned that the alloying level of ferrum Ni-based (J75) alloy is high, except host element Fe, Cr, Ni
Outward, possibly together with alloy elements such as Mo, Ti, Al, V, such as: use common melting (tungsten argon arc
Weldering) method, owing to its heat input is big, the heat affected area of joint can be very big, and this can make the strengthening separated out in alloy
Phase γ '-Ni3(Al, Ti) back dissolving, forms obvious lean γ ' district, significantly reduces strength of joint in heat affected area.More attach most importance to
Want, owing to alloying level is high, joint is easily formed solidification cracking and heat affected area grain boundary liquation crackle.
Electron beam welding belongs to the one of high energy beam current welding, and owing to having, heat input is little, energy is concentrated, weldering deep welding width
Than big, be not required to filler metal and bevel, the advantage such as simultaneously cause material heat affected area little, at many necks
Application is obtained on the material in territory and component connection.Electron beam welding is selected to carry out the connection of J75 alloy, favorably
In improving joint performance.But still the heat affected area of one fixed width can be formed in J75 alloy side, thus cause strong
Change phase γ '-Ni3(Al, Ti) back dissolving, is forming certain lean γ ' district, is reducing strength of joint.Simultaneously as containing Ti,
How the elements such as Al, even if using vacuum electron beam welding, suppress grain boundary liquation crackle in heat affected area in joint
Formed and still can not be ignored.
Summary of the invention
It is an object of the invention to provide a kind of iron nickel base alloy welding point heat affected area grain boundary liquation crackle to control
Method, solves iron nickel base alloy joint in prior art and is easily formed wider lean γ ' district and the problem of grain boundary liquation crackle.
The technical scheme is that
A kind of iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, iron nickel base alloy is heavy
Form sediment strengthening austenitic alloy, uses vacuum electron beam welding method, comprises the steps:
(1) iron nickel base alloy sheet material interface uses polishing to process, and surface roughness is Ra1.6～3.2 μm；
(2) mother metal after polishing in step (1) being processed carries out decontamination process, first selects oil during process
Ether oil removing, uses ethanol to clean subsequently, and this decontamination processes and need to carry out in first 10 minutes～3 hours in weldering；
(3) iron nickel base alloy after step (2) being processed is built-in clamping fixed in welding booth, and interface uses tight
Coordinate and keep two pieces of mother metal horizontal positioned；
(4) closing vacuum welding chamber evacuation, during welding, vacuum is 5 × 10-3Pa～1 × 10-2Pa；
(5), when room to be welded reaches the vacuum required by step (4), the tack welding of two pieces of mother metals is first carried out,
Tack welding uses point location, and position is respectively before, during and after weld seam at three, and tack welding technological parameter is: add
Speed voltage 40～60KV, welding current 2～15mA, focus current 1.5～3.0A, the time 1～3s；
(6) formally being welded by the sheet material after step (5) tack welding, welding uses single cycle welding side
Formula, welding condition is: accelerating potential 50～60KV, welding current 15～50mA, focus current 1.5～
3.0A, deflection of a beam of electrons amplitude 0.3～0.8mm, frequency 200～350Hz, speed of welding 0.5～1.5m/min；
(7) after step (6) completes, keep welding plate clamping position motionless, carry out face of weld and modify welding,
Modify Welding parameter be: accelerating potential 50～60KV, welding current 2～15mA, focus current 1.5～
2.8A, speed of welding 0.5～1.5m/min；
(8) after step (7) completes, keep welding plate clamping position motionless, use electron beam butt welded seam to dissipate
Burnt scanning, scanning process parameter is: accelerating potential 20～40KV, sweep current 2～10mA, focus current
2.0～3.0A, scanning speed 0.5～1.5m/min, scanning times 10～20 times.
Described iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, welding uses vacuum
Electron-beam welder.
Described iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, electron-bombardment welding
Machine is middle pressure electron-beam welder.
Described iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, iron nickel base alloy plate
The thickness range of material is 2.0～20mm.
Described iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, iron nickel base alloy
The trade mark is J75.
The design philosophy of the present invention is:
The iron nickel base alloy joint heat affected area grain boundary liquation crack controlling means of the present invention, uses vacuum electron beam
Welding method, particularly as follows: the built-in clamping fixed → welding booth's evacuation of mother metal pre-welding treatment → vacuum welding chamber → fixed
Single cycle welding → postwelding modification welding → postwelding the electron beam of position welding → having electronic beam steering scanning defocuses to be swept
Retouch the process route of weld seam.Pre-welding treatment, on the one hand can make mother metal docking closely, prevent welding depression；Another
The spot on aspect removable mother metal surface, prevents the pore in joint and is mingled with generation；By before weld seam, in,
Rear three-point fix is welded, and prevents the mother metal changing of the relative positions in welding process.After welding treatment, on the one hand by electron beam self
Deflection scanning, increases liquid state of molten pool metal flow, backfills liquefaction crystal boundary area, heat affected area, it is to avoid liquation crack shape
Become；On the other hand defocus weld seam by postwelding electron beam to scan, make molten bath and heat affected area short-term warming, in analysis
Go out while appropriate γ ' hardening constituent is effectively improved strength of joint, heat affected area grain boundary liquation crackle can be suppressed to be formed.
Advantages of the present invention and providing the benefit that:
1, iron nickel base alloy interface is carried out polishing process by the present invention, uses close-fitting to be incorporated in when assembling simultaneously
Carry out tack welding before welding, can effectively control welding deformation and prevent the generation of face of weld metal depression defect.
2, the present invention is applied with the deflection scanning of electron beam self in welding process, on the one hand increases molten pool metal stream
Dynamic, reduction molten pool metal segregation；On the other hand liquid state of molten pool metal backfill heat affected area crystal boundary liquid can be also conducive to
Change district, it is to avoid the formation of joint grain boundary liquation crackle.
3, the modification using postwelding in the present invention is welded, and can eliminate the face of weld defects such as splashing, depression, is beneficial to
Shaping surface.
4, the present invention carries out the electron beam of weld seam at postwelding and defocus scanning, on the one hand molten bath and ferrum can be promoted Ni-based
The heat affected area of alloy side separates out suitable number γ ' hardening constituent, eliminates its lean γ ' formed in welding process
District, significantly improves strength of joint；On the other hand, beneficially heat affected area slow cooling, it is to avoid joint liquation crack shape
Become.
5, using the iron nickel base alloy joint of present invention welding, joint heat affected area is split without lean γ ' district and grain boundary liquation
Stricture of vagina is formed.The inventive method welding iron nickel base alloy joint surface shape, strength of joint 980MPa with
On, even up to more than 1030MPa, with the strength factor of mother metal up to more than 0.9, joint impact toughness αkU
At 980KJ/m2Above, even up to 1020KJ/m2Above.
Accompanying drawing explanation
Fig. 1 is J75 sheet alloy Microstructure of Joint figure.
Detailed description of the invention
In a specific embodiment, the hot shadow of welding point of ferrum of the present invention Ni-based precipitate strengthened austenite alloys sheet material
Ringing district's grain boundary liquation crack controlling means, use vacuum electron beam welding, vacuum electron beam welder is middle pressure vacuum
Electron-beam welder, its technological process is: built-in clamping fixed → welding booth of mother metal pre-welding treatment → vacuum welding chamber takes out
Single cycle welding → the postwelding of vacuum → positioning welding → having electronic beam steering scanning modifies welding → postwelding electronics
Beam spreading Jiao scans the process route of weld seam.Wherein: the thickness range of iron nickel base alloy sheet material is 2.0～20mm,
The iron nickel base alloy trade mark is J75, and its chemical composition is as follows: by weight percentage, nickel: 29.0～32.0, chromium:
14.0～16.0, molybdenum: 1.30～1.50, titanium: 1.60～2.30, aluminum: 0.2～0.5, silicon: 0.1～0.3, boron:
0.001～0.006, ferrum: surplus.
Below by embodiment and accompanying drawing, the present invention is described in further detail.
Embodiment 1:
The vacuum electronic of the J75 sheet alloy of specification 180mm (length) × 60mm (wide) × 4.0mm (thick)
Bundle welding, specific implementation process is:
1, J75 sheet alloy blank is all hot rolled plate, and the chemical composition of hot rolled plate and mechanical property meet
The requirement of GJB 5724-2006 " resistant to hydrogen rod iron specification ".J75 sheet material through 980 DEG C/1h, shrend+740 DEG C/8h,
Air cooling processes.Sheet material after heat treatment be machined after to 3.5～4.5mm (the present embodiment is 4.0mm), long
Grinding machine is used to be machined to roughness Ra 1.6 μm on degree direction.
2, the mother metal after polishing in step 1 being processed carries out decontamination process, first selects petroleum ether oil removing during process,
Using ethanol to clean subsequently, this decontamination processes and need to carry out in first 30 minutes in weldering；
3, the J75 sheet alloy after step 2 being processed is built-in clamping fixed in welding booth, and interface uses tight fit
And keep two pieces of mother metal horizontal positioned, and pressing plate is used to compress；
4, vacuum welding chamber evacuation, vacuum 6 × 10 during welding are closed-3Pa；
5, when room to be welded reaches the vacuum required by step 4, first carrying out the tack welding of weld seam, tack welding is adopted
With point location, position is respectively before, during and after weld seam at three, and tack welding technological parameter is: accelerating potential 40～
60KV (the present embodiment is 50KV), welding current 2～15mA (the present embodiment is 2mA), focus current
1.5～3.0A (the present embodiment is 2.325A), the time 1～3s (the present embodiment is 1.5s)；
6, formally being welded by the sheet material after step 5 tack welding, welding uses single cycle welding manner, weldering
Connecing technological parameter is: accelerating potential 50～60KV (the present embodiment is 50KV), welding current 15～50mA
(the present embodiment is 25mA), focus current 1.5～3.0A (the present embodiment is 2.325A), deflection of a beam of electrons shakes
0.3～0.8mm (the present embodiment is 0.6mm), frequency 200～350Hz (the present embodiment is 300Hz),
Speed of welding 0.5～1.5m/min (the present embodiment is 1m/min)；
7, after step 6 completes, keep welding plate clamping position motionless, carry out face of weld and modify welding, modify weldering
Technological parameter is: accelerating potential 50～60KV (the present embodiment is 50KV), welding current 2～15mA (this
Embodiment is 7mA), focus current 1.5～2.8A (the present embodiment is 2.575A), speed of welding 0.5～
1.5m/min (the present embodiment is 0.8m/min)；
8, after step 7 completes, keep welding plate clamping position motionless, use electron beam butt welded seam to carry out defocusing scanning,
Scanning process parameter is: accelerating potential 20～40KV (the present embodiment is 30KV), sweep current 2～10mA
(the present embodiment is 4mA), focus current 2.0～3.0A (the present embodiment is 2.575A), scanning speed 0.5～
1.5m/min (the present embodiment is 1.5m/min), scanning times 10～20 times (the present embodiment is 15 times).
9, after step 8 completes, by JB/T4730.2-2005, " bearing device Non-Destructive Testing part 2 ray
Detection " carry out welding point x-ray detection, result shows joint pore-free, the defect such as is mingled with and generates.
10, intercept the J75 alloy welding point cross section sample processed by step 8 and carry out Analysis on Microstructure,
Result display joint generates without defects such as heat affected area intergranular liquation cracks, is specifically shown in Fig. 1.Will be by step 8 place
The J75 alloy-junction of reason carries out mechanical property by GB/T 228-2002 " metal material tensile testing at ambient temperature "
Can test, the results are shown in Table 1.
Table 1.J75 alloy welding joint mechanical property
The J75 alloy-junction that thickness of slab is 4.0mm of the present embodiment welding is without heat affected area grain boundary liquation flaw shape
Become, and tensile strength is not less than 1040MPa, with the strength factor of mother metal up to more than 0.95, impact toughness
αkUIt is not less than 1030KJ/m2.Therefore, it can be seen that use the J75 alloy-junction of the inventive method welding without heat
Zone of influence grain boundary liquation crackle, has higher-strength and impact toughness.
Embodiment 2:
The vacuum electronic of the J75 sheet alloy of specification 120mm (length) × 60mm (wide) × 11mm (thick)
Bundle welding, difference from Example 1 is, the J75 sheet alloy thickness welded is 11mm, accordingly
Have adjusted welding condition, postwelding modifies Welding parameter and electron beam scanning number of times.
Use with embodiment 1 through the J75 sheet alloy blank of identical heat treatment, machine after heat treatment to 11mm
Thickness, length direction using grinding machine be machined to roughness is Ra1.6 μm；Weld first 30 minutes and select petroleum ether oil removing,
And clean the mother metal after polishing processes with ethanol；Use docking, tight fit mode by two pieces of J75 alloy sheets subsequently
Material is built-in clamping fixed in welding booth, and keeps two pieces of mother metal horizontal positioned；Close vacuum welding chamber and by vacuum
It is evacuated to 8 × 10-3Carrying out the tack welding of weld seam after Pa, tack welding uses point location, position respectively before weld seam,
In, Hou Sanchu, tack welding technological parameter is: accelerating potential 60KV, welding current 3mA, focus current 2.335A,
Time 1s；Using single cycle mode formally to weld, welding condition is: accelerating potential 60KV, weldering
Meeting electric current 35mA, focus current is 2.335A, deflection of a beam of electrons amplitude 0.6mm, frequency 300Hz, welding
Speed 0.9m/min；Use accelerating potential 50KV, welding current 9mA, focus current 2.575A, welding speed
Degree 0.7m/min carries out modifying welding；Use accelerating potential 40KV, sweep current 6mA, focus current 2.775A,
Scanning speed 1.2m/min butt welded seam carries out defocusing scanning, scanning times 15 times.By JB/T4730.2-2005,
" bearing device Non-Destructive Testing part 2 ray detection " carries out welding point x-ray detection, and result shows to connect
Head pore-free, the defect such as it is mingled with and generates；Intercepting joint cross section sample and carry out Analysis on Microstructure, result shows
Joint generates without defects such as heat affected area intergranular liquation cracks；Intercept different alloys joint samples, by GB/T
228-2002 " metal material tensile testing at ambient temperature " carries out Mechanics Performance Testing, the results are shown in Table 2.
Table 2.J75 alloy welding joint mechanical property
The present embodiment welding the J75 alloy-junction pore-free that thickness of slab is 11mm, be mingled with and heat affected area intergranular
Liquation crack, and tensile strength is not less than 1030MPa, with the strength factor of mother metal up to more than 0.94, impact
Toughness αkUIt is not less than 1020KJ/m2.Therefore, it can be seen that use the J75 alloy-junction of the inventive method welding
The crackle of grain boundary liquation without heat affected area, has higher-strength and impact toughness.
Embodiment 3:
The vacuum electronic of the J75 sheet alloy of specification 150mm (length) × 80mm (wide) × 19mm (thick)
Bundle welding, difference from Example 1 is, the J75 sheet alloy thickness welded is 19mm, accordingly
Have adjusted welding condition, postwelding modifies Welding parameter and electron beam scanning number of times.
Use with embodiment 1 through the J75 sheet alloy blank of identical heat treatment, machine after heat treatment to 19mm
Thickness, length direction using grinding machine be machined to roughness is Ra1.6 μm；Weld first 30 minutes and select petroleum ether oil removing,
And clean the mother metal after polishing processes with ethanol；Use docking, tight fit mode by two pieces of J75 alloy sheets subsequently
Material is built-in clamping fixed in welding booth, and keeps two pieces of mother metal horizontal positioned；Close vacuum welding chamber and by vacuum
It is evacuated to 5 × 10-3Carrying out the tack welding of weld seam after Pa, tack welding uses point location, position respectively before weld seam,
In, Hou Sanchu, tack welding technological parameter is: accelerating potential 60KV, welding current 5mA, focus current 2.285A,
Time 1s；Using single cycle mode formally to weld, welding condition is: accelerating potential 60KV, weldering
Meeting electric current 47.5mA, focus current is 2.285A, deflection of a beam of electrons amplitude 0.8mm, frequency 300Hz, weldering
Connect speed 0.8m/min；Use accelerating potential 50KV, welding current 8mA, focus current 2.695A, welding
Speed 0.7m/min carries out modifying welding；Use accelerating potential 40KV, sweep current 6mA, focus current
2.825A, scanning speed 1.2m/min butt welded seam carries out defocusing scanning, scanning times 15 times.Press
JB/T4730.2-2005, " bearing device Non-Destructive Testing part 2 ray detection " carries out welding point x-ray
Detection, result shows joint pore-free, the defect such as is mingled with and generates；Intercept joint cross section sample and carry out microcosmic group
Knitting analysis, result display joint generates without defects such as heat affected area intergranular liquation cracks；Intercept different alloys joint
Sample, carries out Mechanics Performance Testing by GB/T 228-2002 " metal material tensile testing at ambient temperature ",
The results are shown in Table 3.
Table 3.J75 alloy welding joint mechanical property
The present embodiment welding the J75 alloy-junction pore-free that thickness of slab is 19mm, be mingled with and heat affected area intergranular
Liquation crack, and tensile strength is not less than 1030MPa, with the strength factor of mother metal up to more than 0.94, impact
Toughness αkUIt is not less than 1020KJ/m2.Therefore, it can be seen that use the J75 alloy-junction of the inventive method welding
The crackle of grain boundary liquation without heat affected area, has higher-strength and impact toughness.
Embodiment result shows, in using the process parameters range of technical solution of the present invention, all can realize the present invention
Purpose, the J75 alloy-junction heat affected area welded is formed without lean γ ' district and grain boundary liquation crackle.
Claims (5)
1. an iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means, it is characterised in that iron nickel base alloy is precipitate strengthened austenite alloys, uses vacuum electron beam welding method, comprises the steps:
(1) iron nickel base alloy sheet material interface uses polishing to process, and surface roughness is Ra1.6～3.2 μm；
(2) the iron nickel base alloy sheet material after polishing in step (1) being processed carries out decontamination process, first selects petroleum ether oil removing during process, uses ethanol to clean subsequently, and this decontamination processes and need to carry out in first 10 minutes～3 hours in weldering；
(3) the iron nickel base alloy sheet material after step (2) being processed is built-in clamping fixed in welding booth, and interface uses close-fitting to merge two pieces of iron nickel base alloy sheet material horizontal positioned of holding；
(4) closing vacuum welding chamber evacuation, during welding, vacuum is 5 × 10-3Pa～1 × 10-2Pa；
(5) when room to be welded reaches the vacuum required by step (4), first carry out the tack welding of two blocks of iron nickel base alloy sheet materials, tack welding uses point location, position is respectively before, during and after weld seam at three, tack welding technological parameter is: accelerating potential 40～60KV, welding current 2～15mA, focus current 1.5～3.0A, the time 1～3s；
(6) the iron nickel base alloy sheet material after step (5) tack welding is formally welded, welding uses single cycle welding manner, welding condition is: accelerating potential 50～60KV, welding current 15～50mA, focus current 1.5～3.0A, deflection of a beam of electrons amplitude 0.3～0.8mm, frequency 200～350Hz, speed of welding 0.5～1.5m/min；
(7), after step (6) completes, keep the iron nickel base alloy sheet material clamping position after formal welding motionless, carry out face of weld and modify welding, modifying Welding parameter is: accelerating potential 50～60KV, welding current 2～15mA, focus current 1.5～2.8A, speed of welding 0.5～1.5m/min；
(8) after step (7) completes, the iron nickel base alloy sheet material clamping position keeping face of weld to modify after welding is motionless, electron beam butt welded seam is used to carry out defocusing scanning, scanning process parameter is: accelerating potential 20～40KV, sweep current 2～10mA, focus current 2.0～3.0A, scanning speed 0.5～1.5m/min, scanning times 10～20 times.
2. according to the iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means described in claim 1, it is characterised in that welding uses vacuum electron beam welder.
3. according to the iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means described in claim 2, it is characterised in that vacuum electron beam welder is middle pressure electron-beam welder.
4. according to the iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means described in claim 1, it is characterised in that the thickness range of iron nickel base alloy sheet material is 2.0～20mm.
5. according to the iron nickel base alloy welding point heat affected area grain boundary liquation crack controlling means described in claim 1, it is characterised in that the trade mark of iron nickel base alloy is J75.
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| CN104827176B (en) * | 2015-05-15 | 2016-09-21 | 哈尔滨工业大学 | Electron beam welding tantalum and the energy follow-up adjustment method of invar alloy girth joint |
| CN107470766B (en) * | 2016-06-07 | 2020-01-03 | 中国科学院金属研究所 | Method for improving weldability of iron-nickel-based alloy through grain boundary sawtooth treatment |
| CN108907439B (en) * | 2018-08-30 | 2020-09-15 | 郑州郑飞机电技术有限责任公司 | Electron beam welding processing method of titanium alloy thin-walled tube with tube nozzle |
| CN110385517A (en) * | 2019-08-22 | 2019-10-29 | 北京星航机电装备有限公司 | A kind of titanium alloy electro-beam welding method based on laser cleaning processing |
| CN112719555B (en) * | 2020-12-22 | 2022-08-09 | 兰州长征机械有限公司 | Electron beam welding method for nickel-based alloy tube box of air cooler |
| CN112858360B (en) * | 2021-02-19 | 2022-11-29 | 东方电气集团东方锅炉股份有限公司 | Method for testing liquefaction crack sensitivity of metal material |
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