CN108015445A - Microalloying connection method and microalloying connection structure - Google Patents
Microalloying connection method and microalloying connection structure Download PDFInfo
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- CN108015445A CN108015445A CN201711279472.5A CN201711279472A CN108015445A CN 108015445 A CN108015445 A CN 108015445A CN 201711279472 A CN201711279472 A CN 201711279472A CN 108015445 A CN108015445 A CN 108015445A
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- microalloying
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- powder coating
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 27
- 229910001182 Mo alloy Inorganic materials 0.000 claims abstract description 24
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 239000010936 titanium Substances 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 238000007750 plasma spraying Methods 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 5
- 230000013011 mating Effects 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000005275 alloying Methods 0.000 abstract description 3
- 230000002153 concerted effect Effects 0.000 abstract description 3
- 230000002498 deadly effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 229940098458 powder spray Drugs 0.000 abstract 1
- 239000003758 nuclear fuel Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000003776 cleavage reaction Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007017 scission Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000010433 powder painting Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The invention discloses a kind of microalloying connection method and microalloying connection structure, microalloying connection method includes：S1, prepare microalloying powder；S2, by microalloying powder spray the first connector and/or the second connector to be welded land surfaces for the treatment of, formed microalloying powder coating；First connector and the second connector, be attached by S3 in a manner of melting welding, and microalloying powder coating and the matrix of the first connector and the second connector occur atoms permeating and form metallurgical binding.Pass through the setting of microalloying powder coating in the present invention, atoms permeating occurs with matrix and forms metallurgical binding, the high affinity of the impurity elements such as harmful oxygen for being segregated using micro alloying element with grain boundaries, nitrogen is made a concerted effort to improve welding zone Grain-boundary Junctions, form the welding point of high weld strength, tensile strength reaches more than the 90% of Mo substrate intensity, overcomes the low deadly defect of traditional molybdenum alloy welding brittleness and intensity.
Description
Technical field
The present invention relates to molybdenum alloy interconnection technique field, more particularly to a kind of microalloying connection side suitable for molybdenum alloy
Method and microalloying connection structure.
Background technology
After Fukushima, Japan nuclear accident occurs, Nuclear Safety becomes the focus of international common people's common concern again, and how
Further improve Nuclear Safety particularly improve nuclear reactor resistance super design reference nuclear accident secure threshold also become core
The important issue of energy sustainable development.The fault-tolerant nuclear fuel of accident (Accident Tolerant Fuels, ATF) this brand-new core
Safe practice concept is exactly born in this context, and be increasingly becoming the most important research topic of world nuclear industry it
One, the purpose is to be improved upgrading to existing zircaloy/uranium dioxide fuel system, even renewal is replaced to realize drop comprehensively
The reaction enthalpy heat and hydrogen growing amount of low involucrum and high-temperature vapor, lifted structural intergrity of the involucrum under accident superhigh temperature with
And the constraint ability of enhancing involucrum to fission gas etc..
ODS molybdenum alloys are due to high-melting-point, excellent elevated temperature strength and the property such as plasticity and outstanding high temperature creep-resisting
Can and as one of important candidate's cladding materials of ATF researchs.But ODS molybdenum alloys welding embrittlement characteristic is to restrict the material
Technology barrier as the application of ATF involucrums.A large amount of soldering tests of molybdenum and its alloy show, the welding line joint intensity of the material and
Toughness is relatively low, crystal boundary combine it is weak, fracture more intergranular brittle fracture is presented.This welding brittleness of molybdenum and its alloy is mainly due to
The objectionable impurities elements such as oxygen, nitrogen are segregated in crystal boundary and cause interface binding power to decline in welding process.Therefore ODS molybdenum alloys are overcome to weld
Connect the influence that the key of this brittle shortcoming is to eliminate harmful element and improve crystal boundary bond strength as far as possible, how to eliminate oxygen,
The adverse effect of nitrogen is one of the key breakthrough points for improving molybdenum alloy welding performance, and needs the key issue solved at present.
The content of the invention
The technical problem to be solved in the present invention is, there is provided a kind of to overcome traditional molybdenum alloy welding brittleness and intensity is low
Microalloying connection method and microalloying connection structure.
The technical solution adopted by the present invention to solve the technical problems is：A kind of microalloying connection method is provided, including
Following steps：
S1, prepare microalloying powder；The microalloying powder includes the component of following mass percent：Zirconium powder 0.1-
2wt%, carbon dust 0.01-0.5wt% and titanium valve 0.1-2wt%, remaining is molybdenum powder；
S2, by the microalloying powder using plasma spraying technology be sprayed on the first connector to be welded and/or
Second connector treats land surfaces, forms microalloying powder coating；
First connector and the second connector, be attached by S3 in a manner of melting welding, and the microalloying powder applies
Layer occurs atoms permeating with the matrix of the first connector and the second connector and forms metallurgical binding.
Preferably, in step S1, the microalloying powder further includes the component of following mass percent：Boron 0.1-
1wt%.
Preferably, in step S2, the thickness of the microalloying powder coating is 1-50 μm.
Preferably, in step S2, first connector and the second connector are molybdenum alloy.
Preferably, first connector is involucrum tube body, and second connector is end plug.
The present invention also provides a kind of microalloying connection structure, including the first connector in mating connection and the second connection
Part, be arranged on first connector and the microalloying powder coating of the second connector joint；The microalloying powder
Coating and the matrix of the first connector and the second connector occur atoms permeating and form metallurgical binding；
The microalloying powder coating includes the component of following mass percent：Zirconium powder 0.1-2wt%, carbon dust 0.01-
0.5wt% and titanium valve 0.1-2wt%, remaining is molybdenum powder.
Preferably, the microalloying powder coating further includes the component of following mass percent：Boron 0.1-1wt%.
Preferably, the thickness of the microalloying powder coating is 1-50 μm.
Preferably, first connector and the second connector are molybdenum alloy.
Preferably, first connector is involucrum tube body, and second connector is end plug.
Beneficial effects of the present invention：By the setting of microalloying powder coating in the present invention, atom occurs with matrix and expands
Dissipate and form metallurgical binding, utilize the high affinity of the impurity element such as micro alloying element and harmful oxygen of grain boundaries segregation, nitrogen
Make a concerted effort to improve welding zone Grain-boundary Junctions, form the welding point of high weld strength；It is strong that the tensile strength of welding line joint reaches Mo substrate
More than the 90% of degree, overcomes the low deadly defect of traditional molybdenum alloy welding brittleness and intensity.
The present invention is suitable for the fault-tolerant cladding nuclear fuels candidate materials of accident-oxide dispersion intensifying molybdenum alloy (ODS-Mo)
The connection of tubing and end plug, drastically increases use of the ODS-Mo alloys in nuclear fuel element, makes nuclear reactor serious
Nuclear fuel assembly structure and the anti-accident ability of functional completeness are maintained under accident conditions, while is also applied to other Mo bases
The welding of alloy.
Brief description of the drawings
Below in conjunction with accompanying drawings and embodiments, the invention will be further described, in attached drawing：
Fig. 1 is the cross-sectional view of microalloying connection structure one embodiment in the present invention；
Fig. 2 is the structure for amplifying sectional view of part A in Fig. 1.
Embodiment
The microalloying connection method of the present invention, comprises the following steps：
S1, prepare microalloying powder.
Microalloying powder includes the component of following mass percent：Zirconium powder (Zr) 0.1-2wt%, carbon dust (C) 0.01-
0.5wt% and titanium valve (Ti) 0.1-2wt%, remaining is molybdenum powder (Mo).
The microalloy, wherein Mo are as primary raw material, by adding other metallic elements such as a small amount of Zr and Ti,
The molybdenum alloy of formation.
In microalloying powder, boron powder (B) 0.1-1wt% can be also added as needed.Alternatively, titanium valve can also be replaced
For boron powder.Each powder can be uniformly mixed by ball grinder.
S2, by microalloying powder be sprayed on the first connector and/or second to be welded using plasma spraying technology
Connector treats land surfaces, forms microalloying powder coating.
First connector treats that land surfaces are located at the connection table being connected with the second connector on the first connector
On face；Second connector treats that land surfaces are located at the connection surface being connected with the first connector on the second connector
On.
Thickness of the microalloying powder coating on land surfaces are treated is 1-50 μm.
First connector and the second connector, are attached, microalloying powder by S3, under vacuum conditions in a manner of melting welding
Last coating and the matrix of the first connector and the second connector occur atoms permeating and form metallurgical binding.
Wherein, using the high affinity of micro alloying element and harmful oxygen of grain boundaries segregation, the impurity element such as nitrogen come
Improve welding zone Grain-boundary Junctions to make a concerted effort, form the welding point of high weld strength；The setting of microalloying powder coating will not significantly drop
The fusing point of low weld seam.The tensile strength of welding line joint reaches more than the 90% of Mo substrate intensity, overcomes traditional molybdenum alloy welding
Brittleness and the low deadly defect of intensity.
Melting welding mode includes electron beam weldering etc..
In the microalloying connection method of the present invention, the first connector and the second connector are molybdenum alloy.The connection method
Suitable for the welding of various molybdenum-base alloys.
In certain embodiments, the first connector is involucrum tube body, and the second connector is end plug, so that the connection of the present invention
Method is suitable for the fault-tolerant cladding nuclear fuels candidate materials of accident-oxide dispersion intensifying molybdenum alloy (ODS-Mo) tubing and end plug
Connection, drastically increase use of the ODS-Mo alloys in nuclear fuel element, make nuclear reactor under major accident operating mode
Maintain nuclear fuel assembly structure and the anti-accident ability of functional completeness.
With reference to figure 1, microalloying connection structure of the invention, including the first connector 10 and second in mating connection connect
Fitting 20, the microalloying powder coating 30 for being arranged on 20 joint of the first connector 10 and the second connector；Microalloying powder
The matrix of last 30 and first connector 10 of coating and the second connector 20 occurs atoms permeating and forms metallurgical binding.The microalloying
Connection structure can be realized by above-mentioned microalloying connection method.
Wherein, microalloying powder coating 30 includes the component of following mass percent：Zirconium powder 0.1-2wt%, carbon dust
0.01-0.5wt% and titanium valve 0.1-2wt%, remaining is molybdenum powder.
Microalloying powder coating 30 may also include the component of following mass percent：Boron 0.1-1wt%.In addition, coating
In titanium valve can also replace with boron.
The thickness of microalloying powder coating 30 is 1-50 μm.
In the microalloying connection structure of the present invention, the first connector 10 and the second connector 20 are molybdenum alloy.
In one embodiment, the end of end plug is coupled in the mouth of pipe of involucrum tube body, microalloying powder coating 30
It is arranged at the position that both connect, i.e., between end and the mouth of pipe.
In another embodiment, as shown in Fig. 2, the end periphery as the end plug of the first connector 10 is equipped with annular
Step 11, the end as the involucrum tube body of the second connector 20 coordinate on ring-shaped step 11, microalloying powder coating 30
It is arranged between the end of ring-shaped step 11 and involucrum tube body.
Below by way of specific embodiment, the invention will be further described.
Embodiment 1
(powder is mixed with ball grinder after wt% alloyage powder according to Mo-0.5Zr-0.06C-0.2Ti-0.5B
It is even), treat that welding zone prepares the uniform microalloying powder painting of about 2 μ m-thicks in ODS-Mo alloy end plugs using plasma spraying technology
Layer, recycles electron beam weldering to carry out tubing/end plug connection under vacuum conditions, and weld seam tensile strength reaches about the 90% of mother metal,
Transcrystalline cleavage fracture is mainly presented in fracture, shows that commissure crystal boundary bond strength is significantly improved.
Embodiment 2
(powder is mixed with ball grinder after wt.% alloyage powder according to Mo-0.3Zr-0.03C-0.5Ti-0.2B
It is even), treat that welding zone prepares the uniform microalloying powder painting of about 5 μ m-thicks in ODS-Mo alloy end plugs using plasma spraying technology
Layer, recycles Laser Welding to carry out tubing/end plug connection under vacuum conditions, and weld seam tensile strength reaches about the 85% of mother metal, breaks
Mouth is main to be presented transcrystalline cleavage fracture, this shows that commissure crystal boundary bond strength is significantly improved.
Embodiment 3
(powder is uniformly mixed with ball grinder after wt.% alloyage powder) according to Mo-1Zr-0.03C-1Ti-0.8B,
Treat that welding zone prepares the uniform microalloying powder coating of about 5 μ m-thicks in ODS-Mo alloy end plugs using plasma spraying technology, then
Carry out tubing/end plug connection under vacuum conditions using Laser Welding, weld seam tensile strength reaches about the 95% of mother metal, and fracture is main
Transcrystalline cleavage fracture is presented, this shows that commissure crystal boundary bond strength is significantly improved.
The foregoing is merely the embodiment of the present invention, is not intended to limit the scope of the invention, every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made, is directly or indirectly used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of microalloying connection method, it is characterised in that comprise the following steps：
S1, prepare microalloying powder；The microalloying powder includes the component of following mass percent：Zirconium powder 0.1-
2wt%, carbon dust 0.01-0.5wt% and titanium valve 0.1-2wt%, remaining is molybdenum powder；
S2, by the microalloying powder be sprayed on the first connector and/or second to be welded using plasma spraying technology
Connector treats land surfaces, forms microalloying powder coating；
First connector and the second connector, be attached by S3 in a manner of melting welding, the microalloying powder coating with
The matrix of first connector and the second connector occurs atoms permeating and forms metallurgical binding.
2. microalloying connection method according to claim 1, it is characterised in that in step S1, the microalloying powder
End further includes the component of following mass percent：Boron 0.1-1wt%.
3. microalloying connection method according to claim 1, it is characterised in that in step S2, the microalloying powder
The thickness of last coating is 1-50 μm.
4. microalloying connection method according to claim 1, it is characterised in that in step S2, first connector
It is molybdenum alloy with the second connector.
5. microalloying connection method according to claim 4, it is characterised in that first connector is cladding tubes
Body, second connector are end plug.
A kind of 6. microalloying connection structure, it is characterised in that including the first connector and the second connector in mating connection,
It is arranged on first connector and the microalloying powder coating of the second connector joint；The microalloying powder coating
Atoms permeating occurs with the matrix of the first connector and the second connector and forms metallurgical binding；
The microalloying powder coating includes the component of following mass percent：Zirconium powder 0.1-2wt%, carbon dust 0.01-
0.5wt% and titanium valve 0.1-2wt%, remaining is molybdenum powder.
7. microalloying connection structure according to claim 6, it is characterised in that the microalloying powder coating also wraps
Include the component of following mass percent：Boron 0.1-1wt%.
8. microalloying connection structure according to claim 6, it is characterised in that the thickness of the microalloying powder coating
Spend for 1-50 μm.
9. microalloying connection structure according to claim 6, it is characterised in that first connector and the second connection
Part is molybdenum alloy.
10. microalloying connection structure according to claim 9, it is characterised in that first connector is cladding tubes
Body, second connector are end plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279472.5A CN108015445B (en) | 2017-12-06 | 2017-12-06 | Microalloyed connection method and microalloyed connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711279472.5A CN108015445B (en) | 2017-12-06 | 2017-12-06 | Microalloyed connection method and microalloyed connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108015445A true CN108015445A (en) | 2018-05-11 |
| CN108015445B CN108015445B (en) | 2024-05-10 |
Family
ID=62078773
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711279472.5A Active CN108015445B (en) | 2017-12-06 | 2017-12-06 | Microalloyed connection method and microalloyed connection structure |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451633A (en) * | 2020-04-09 | 2020-07-28 | 西安交通大学 | Welding and packaging method for molybdenum alloy accident fault-tolerant fuel rod |
| CN113039029A (en) * | 2018-11-19 | 2021-06-25 | 普兰西股份有限公司 | Refractory metal component produced by additive method, additive method and powder |
| CN113732504A (en) * | 2021-09-18 | 2021-12-03 | 西安交通大学 | Method for strengthening welding performance of tungsten/molybdenum and alloy thereof by ODS |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113039029A (en) * | 2018-11-19 | 2021-06-25 | 普兰西股份有限公司 | Refractory metal component produced by additive method, additive method and powder |
| CN111451633A (en) * | 2020-04-09 | 2020-07-28 | 西安交通大学 | Welding and packaging method for molybdenum alloy accident fault-tolerant fuel rod |
| CN113732504A (en) * | 2021-09-18 | 2021-12-03 | 西安交通大学 | Method for strengthening welding performance of tungsten/molybdenum and alloy thereof by ODS |
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| Publication number | Publication date |
|---|---|
| CN108015445B (en) | 2024-05-10 |
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