CN107598415B - A kind of self-shield open arc flux-cored wire based on coordination strengthening effect - Google Patents
A kind of self-shield open arc flux-cored wire based on coordination strengthening effect Download PDFInfo
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Abstract
The invention discloses a kind of self-shield open arc flux-cored wire based on coordination strengthening effect; it uses H08A cold rolling thin steel strip for outer layer foreskin; it is equipped with high carbon ferro-chrome, ferro-niobium, molybdenum-iron, crystalline flake graphite, ultra micro fine graphite, ferrosilicon, ferro-boron, ultra micro atomized aluminium etc. and constitutes powder core, which specifically includes that fine platy martensite and austenitic duplex combination matrix, precipitation NbC particle in situ and the M along brilliant discontinuously netted or dendroid distribution23(C,B)6Phase, form the fine grain structure body of two-phase combination a matrix and hard phase cooperative reinforcing, when this is allowed to by external abrasive wear shear action, each phase constitution synergistic effect, alloy overall performance is uniform micro abrasion, extremely excellent wearability is presented, can be used for the wear-resistant material with components under the serious abrasive wear operating condition of shock loading, such as S-shaped concrete conveyance inside pipe wall wearing layer.
Description
Technical field
The invention belongs to flux-cored wire technical field, in particular to a kind of self-insurance based on coordination strengthening effect
Protect open arc flux-cored wire.
Background technique
According to incompletely statistics, the part to fail by abrasive wear accounts for about the 50% of all kinds of wearing part sums, and alloy is resistance to
Abrasive wear behavior depends on the factors such as its hard phase attribute, form, size and number, and toughness is related with matrix quantity.
The main preparation means of antifriction alloy have: casting, thermal spraying, surfacing, plating and built-up welding etc., wherein overlaying method with
Its deposition efficiency is high, manufactures using workpiece and to remanufacture wearing layer most, and mostly use flux-cored wire self-shield open arc built-up welding side
Method.Self-shield open arc flux-cored wire is made of metal sheath and powder core two parts, and powder core is mainly made of all kinds of metal powders,
Dross-oxidised amount is few when built-up welding, also referred to as " no slag welding wire ", this is allowed to have deposition with regard to implementable continuous built-up welding without scarfing cinder
High-efficient outstanding advantages can realize online reparation to abrasion workpiece, significantly reduce idle cost and especially be favored by producer.
For institutional framework, antifriction alloy can be divided into hypoeutectic, eutectic and hypereutectic alloy.Hypoeutectic alloy is by born of the same parents' shape
α-Fe perhaps γ-Fe matrix and along cellular crystal circle distribution netted or dendritic M7C3Or α-Fe+M3(C, B) or α-Fe
+M3(C,B)+M7C3Or α-Fe+M23(C,B)6Deng abnormal eutectic composition.The major defect of hypoeutectic constructional alloy is: born of the same parents' shape α-
Fe γ-Fe matrix is partially soft, and abrasive grain tip is caused to be easy to be inserted into, and is not enough to hinder along crystal mesh shape or dendroid hard phase
Abrasive grain micro-ploughing causes its Abrasive Resistance of Stubble-cleaning relatively low.Eutectic alloy Main Tissues are eutectic, and performance is excessively crisp, generally
Not it is used as wear-resistant material.Hypereutectic alloy is by the M that comes into being7C3、M23(C,B)6Or M2B is main wear phase, and the change around the phase
State eutectic α-Fe+M3(C,B)、α-Fe+M3(C,B)+M7C3Or α-Fe+M23(C,B)6Equal composition.Wherein eutectic, such as (α-Fe+M3
(C, B)), often with herring-bone form metamorphosis ledeburite Ld' occur and being allowed to property is crisp.Impact due to abnormal eutectic in plus load is made
It is easy to embrittlement under and forms peeling pit, abrasive grain is easy to be inserted into and aggravates alloy abrasion.The wearability of such alloy is by brittleness
Eutectic limitation, room for promotion are limited.
Moreover, improve its wearability in the case where impacting operating condition in order to increase alloy ductility, using strong carbide shape
At element ti, Nb and V, it is allowed in situ and the particles such as TiC, NbC, VC is precipitated, play dispersion-strengtherning and Grain Refinement Effect.Due to being precipitated
The phases particle such as TiC, NbC, VC it is less than normal, be easily lost with abrasion chip and lose wear-resisting particle and act on.In addition, strong carbide is formed
Element ti, Nb and V form " competing carbon " effect with chromium, make nascent M7C3The formation of phase is greatly interfered.Moreover, due to closing
TiC, NbC, VC phase being precipitated in gold are poor in conjunction with matrix, are hit and easily loosen and be detached from, alloy under impact loading operating condition
Abrasive Resistance of Stubble-cleaning room for promotion is relatively limited, but has paid excessively high material cost for it.
Wear part under shock loading operating condition, such as S type concrete delivery pipe.The part is there are S type bend, on bend
Concavo-convex portion directly by the greater impact load of concrete, easily too early it is worn out, cause concrete perfusion work be forced temporarily
Stop, seriously affects normal production operation.The wear working condition of the part is severe, it is desirable that and inner wall alloy has excellent wearability, and
Higher toughness is had both, to adapt to the working condition requirement of shock loading abrasion.
Summary of the invention
The purpose of the present invention is to provide one kind can overcome the wear-resisting welding wire with flux core of prior art defect, and welds the medicine core
The silk existing excellent wear of self-shield open arc hardfacing alloy, but also with higher toughness.
Above-mentioned purpose of the invention is achieved through the following technical solutions: it is bright to be somebody's turn to do the self-shield based on coordination strengthening effect
Arc flux-cored wire, it is equipped with powdery components and constitutes powder core, self-insurance using H08A cold rolling thin steel strip as outer layer foreskin in the foreskin
Shield open arc built-up welding forms a kind of small grains alloy of organized cooperative reinforcing effect, which includes fine platy martensite
NbC phase is precipitated with austenitic duplex combination matrix, original position and along the M of brilliant discontinuously net distribution23(C,B)6Phase；
The weight percentage of each powdery components of flux-cored wire powder core is respectively as follows:
High carbon ferro-chrome/FeCr70C8.0 that 30~35% chrome content is 68~72%, phosphorus content is 8%；
Ferro-niobium/FeNb60-A that 25~30% niobium content is 60%；
Molybdenum-iron/FeMo50-A that 5~7% amount containing molybdenum is 50%；
3~5% phosphorus content is not less than 98% crystalline flake graphite/C；
2~4% phosphorus content is not less than 99% ultra micro fine graphite/C；
Ferro-boron/FeB18 that 9~11% boron content is 18%；
Ferrosilicon/FeSi45 that 4~5% silicon content is 40~47%；
Mid-carbon fe-mn/FeMn80C1.5 that 1~3% manganese content is 78~85%, phosphorus content is 1.5%；
0.5~1.0% aluminum content is not less than 99% ultra micro atomized aluminium/Al；
Surplus is reduced iron powder/Fe that iron-content is not less than 98%；
The filling rate of the flux-cored wire powder core is 44~46%.
Further, in the flux-cored wire powder core, the high carbon ferro-chrome, ferro-niobium, molybdenum-iron, crystalline flake graphite, ferro-boron, ferrosilicon, in
Carbon ferromanganese, reduced iron powder fineness be 60 mesh；The fineness of the ultra micro fine graphite and ultra micro atomized aluminium is 300 mesh.
Further, which is 410~430A, and speed of welding is 19~21mm/min.
Flux-cored wire self-shield open arc hardfacing alloy matrix of the present invention is fine platy martensite and the base that austenite phase mixes
Body, hard phase mainly include the niobium carbide/NbC particle being precipitated in situ and the six carbon boronations 23 that are discontinuously distributed along crystal mesh shape
Metallic element/M23(C,B)6Phase.On bead-welding technology, using ultra micro atomized aluminium precedent desoxydation, the deoxidation of ultra micro fine graphite mid-term, ferro-boron
With the stereoscopic level deoxidation mode of ferrosilicon molten bath combined deoxidation.In such a way that matrix is dissolved appropriate chromium, molybdenum, manganese and silicon, carbon is controlled
Atom activity, refining alloy crystal grain, obtain with fine platy martensite and austenitic duplex combination matrix, it is in situ be precipitated niobium carbide/
NbC phase and six 23 metallic elements of the carbon boronation/M being discontinuously distributed along crystal mesh shape23(C,B)6The institutional framework of phase, this is allowed to
With coordination strengthening effect, which has both excellent wear and higher toughness, can be used for the serious mill with shock loading
Grain wear working condition components build-up wear-resistant layer, such as S type concrete conveyance inside pipe wall wearing layer.
Compared with prior art, the present invention have following innovative point and the utility model has the advantages that
(1) antifriction alloy design concept and different for point: the design concept of this flux-cored wire hardfacing alloy introduces " tissue
The design concept of cooperative reinforcing " constructs the structure of an alloy substrate and hard phase cooperative reinforcing.In design concept, head reconstruct
It builds the strength that abrasive grain tip is inserted into and hinders net；Secondly, the weak link of antifriction alloy is directed to, such as born of the same parents' shape soft base body, using original position
The composite strengthenings such as hard phase and fine platy martensite scheme and austenic toughened measure is precipitated, it is compound tough to construct a multiphase
The structural body of change.On practice effect, which is 1000HV0.1More than.Traditional antifriction alloy is
Matrix and wear-resisting main phase independent role, often occur that matrix is first worn, brittleness eutectic peels off etc. and the case where unstable wear.
(2) hardfacing alloy born of the same parents shape matrix strength and attribute are different: using multiple elements designs aurification such as solid solution chromium, molybdenum, manganese and silicon
Mode refines born of the same parents' shape matrix grain significantly, and obtains fine platy high strength martensitic and the collaboration of high tenacity austenitic duplex by force
The matrix of toughening；Meanwhile certain amount NbC phase being precipitated in born of the same parents' shape matrix, particle humidification is played, born of the same parents' shape body is further enhanced
Intensity.Born of the same parents' shape body microhardness is up to 1097~1150HV0.1, it is substantially flush with the microhardness along brilliant carbide, substantially
Abrasive grain tip is promoted to be inserted into the inhibition of born of the same parents' shape matrix and significantly improve its Abrasive Resistance of Stubble-cleaning.This and traditional born of the same parents' shape
Austenite or ferrite matrix obdurability it is unbalance attribute it is entirely different.
(3) support substrate of wear phase NbC is different: support wear phase NbC is fine platy high strength martensitic and high tenacity
The two-phase matrix of austenite collaboration Strengthening and Toughening.Since fine platy martensite and austenite are interlaced, make NbC particle insertion jail
Gu, it is difficult to it loosens or removing, it is ensured that the effect of the wear-resisting particle of NbC gives full play to, this and only ferrite or austenite branch
The NbC particle of support is easy to loosen or the situation of removing is significantly different.
(4) different along brilliant category of carbides and volume fraction: traditional hypoeutectic hardfacing alloy is formed to be distributed along born of the same parents' shape matrix
Netted or dendritic hard phase, this flux-cored wire hardfacing alloy use phase toughness ratio M7C3Six much higher carbon boronations 20
Three metallic elements/M23(C,B)6As along brilliant hard phase, this is mutually in netted interrupted distribution, and shared volume is high up to 30~45%
In traditional hypoeutectic alloy 10~20% along crystal mesh shape M7C3Volume fraction, and with 30% or more (α-Fe+M23(C,B)6) edge
Brilliant eutectic morphology is significantly different.
(5) macrohardness is different: 64~65HRC of macrohardness of this flux-cored wire hardfacing alloy, is higher than general high chromium heap
The macrohardness of solder alloy 60HRC or so, wear weight loss are far below commercially available rich chromium cast iron flux-cored wire hardfacing alloy, both have height
Hardness, and superfine wearability is presented.
(6) wearability and wear mechanism are different: micro- peeling with traditional high-rigidity resurfacing welding alloy has plasticity change
The chisel of shape is cut wear mechanism and is compared, which, which only remains, a small amount of rolls trace and Scrap marks, flawless, tool
There is superfine wearability, overcomes traditional hypoeutectic hardfacing alloy wearability generally and hypereutectic alloy wearability is difficult to
The shortcomings that promotion, abrasion are mainly scratch mechanism.
In short, being equivalent to the material weave mesh good using obdurability, net in the flux-cored wire antifriction alloy institutional framework
Existing toughening phase in lattice, and have reinforced phase, interlaced and support.It is each mutually to act synergistically when abrasive wear, produce tissue association
Same strengthening effect.
Present invention can apply to the surfacing manufacturing of components under the serious abrasive wear operating condition of shock loading or remanufacture use
Wear-resistant material, such as wearing layer in S type concrete delivery pipe.
Invention is further described in detail with reference to the accompanying drawings and examples.
Detailed description of the invention
Fig. 1 is a kind of tissue shape on flux-cored wire self-shield open arc hardfacing alloy surface layer based on coordination strengthening effect
State figure.
Fig. 2 is the phase composition figure on open arc hardfacing alloy surface layer shown in Fig. 1.
Fig. 3 is the tissue morphology figure on flux-cored wire open arc built-up welding hypoeutectic high-chromium alloy surface layer.
Fig. 4 is the phase composition figure on hypoeutectic high-chromium alloy surface layer shown in Fig. 3.
Fig. 5 is the tissue morphology figure of flux-cored wire open arc built-up welding hypereutectic high-chromium alloy surface.
Fig. 6 is the phase composition figure of hypereutectic high-chromium alloy surface shown in Fig. 5.
Fig. 7 is the wear morphology figure of open arc hardfacing alloy shown in Fig. 1.
Fig. 8 is the wear morphology figure of hypoeutectic high-chromium alloy shown in Fig. 3.
Fig. 9 is the wear morphology figure of hypereutectic high-chromium alloy shown in Fig. 5.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in further detail for embodiment and comparative example.
A kind of self-shield open arc flux-cored wire based on coordination strengthening effect of the present invention, is achieved in that
The flux-cored wire diameter of phi 3.2mm, is made of medicine core and metal package two parts, and wherein medicine core is by various types dusty material
Composition, including high carbon ferro-chrome, ferro-niobium, molybdenum-iron, crystalline flake graphite, ultra micro fine graphite, ferro-boron, ferrosilicon, mid-carbon fe-mn, ultra tiny aluminium
Powder, reduced iron powder；Metal package uses the H08A cold rolling thin steel strip of specification 16mm × 0.36mm.Before flux-cored wire molding,
Ultra micro atomized aluminium and ultra micro fine graphite are first crossed into 300 meshes, remaining alloy compositions crosses 60 meshes, then mixes all powder component
Close, mix 30 minutes in batch mixer, mixing on flux-cored wire forming machine compression moulding for Φ 4.6mm crin, then with
Each tube reducing 0.2mm, gradually drawing tube reducing is spare to Φ 3.2mm.
By the flux-cored wire of Φ 3.2mm with MZ-1000 welding machine the built-up welding of self-shield open arc, welding current on Q235A steel plate
Controlling value is 410~430A, and speed of welding is 19~21mm/min.Form first layer weld seam.100~150 are air-cooled to weld seam
DEG C or so, the self-shield open arc built-up welding second layer, postwelding is air-cooled；Ibid, built-up welding deposition third layer weld seam.
0.5~1.0% ultra micro atomized aluminium is added in flux-cored wire and is used for precedent desoxydation, reduces flying for molten drop explosion generation
It splashes.Secondly, 2~4% ultra micro fine graphites of addition, are allowed to partially float on molten drop surface in stage droplet transfer, oxidation forms spontaneous
Protective gas promotes the droplet transfer；Meanwhile redundance ultra micro fine graphite can float on above molten bath, further enhance to built-up welding
The self-shield in molten bath and from deoxidation.Then, medicine core component entirety is reduced using 9~11% ferro-boron and 4~5% ferrosilicon
Fusion temperature floats on molten drop for ultra micro fine graphite and weld pool surface creates conditions, and the boron and silicon components for being transitioned into molten bath play joint
Deoxidation is formed by boron oxide, silica and other metal oxides and is complex as borosilicate, and weld pool surface floating
Extra ultra micro fine graphite continues oxidation and forms gas, strengthens the stirring action to molten bath, promotes borosilicate floating from molten bath as early as possible
Out, and in the form of micro slag it removes.
Based on this, in conjunction with attached drawing, applicant proposes the formation machine of the flux-cored wire hardfacing alloy coordination strengthening effect
System: firstly, appropriate different types of carbon component is added, as in high carbon ferro-chrome, mid-carbon fe-mn solid solution carbon and graphitic composition institute
It is carbon containing, enhance the austenitizing ability of alloy.Secondly, NbC is precipitated in situ in born of the same parents' shape matrix using carbide niobium
Phase strengthens born of the same parents' shape matrix；And making born of the same parents' shape poor carbon in γ-Fe body portion region and phase transformation, the appropriate chromium and molybdenum of being dissolved enhances the microcell
The harden ability of alloy, promoting it mutually becomes fine platy martensite, and residue tissue is because of solid solution carbon with higher and manganese amount, geneva
Body transformation temperature MSIt is low and be left austenite, but sheet is mainly presented with fine platy martensitic traoformation in form；Thus, it is formed difficult to understand
Family name's body, fine platy martensite and born of the same parents' shape body in situ that NbC combination Strengthening and Toughening is precipitated.Since fine platy martensite and austenite are mutual
Staggeredly, so that NbC hard-phase particles are by strong substrate support.Finally, utilizing the migration of the control carbon atom such as niobium and molybdenum
Characteristic is allowed to activity reduction, to form M in born of the same parents' shape matrix crystal boundary under conditions of alloy total carbon is high23(C,B)6Phase is closed
Gold extra carbon and boron atom participate in forming the higher M of toughness23(C,B)6Mutually rather than M7(C,B)3Phase, this to constitute wear-resisting
The material of grid is by the higher M of toughness23(C,B)6It mutually weaves, and has in the wear-resisting grid with a certain number of toughness γ-
Fe matrix, thus wear-resisting grid has good obdurability, can bear higher plus load without grain boundary fracture.
So far, which is obviously improved the mechanism of action of wearability based on cooperative reinforcing effect are as follows:
By being acted on from deoxidation and spontaneous protective gas for ultra micro atomized aluminium and ultra micro fine graphite, and appropriate ferro-boron and ferrosilicon promote it is molten
The pond later period from deoxidation, constitutes stereoscopic level from deoxidation protection mechanism；Change carbon original to the affinity of carbon using niobium, molybdenum and chromium
Sub- activity makes carbon that alloy is extra and boron atom form the higher M of toughness in cellular crystal circle23(C,B)6Mutually rather than M7(C,B)3
Phase, to construct the wear-resisting skeleton grid of toughness higher material braiding.Fine platy martensite and austenite are mutual in grid
Staggeredly, so that NbC hard-phase particles are by strong substrate support, the interior structure for forming a coordination and strengthening of alloy
Body, as shown in Figure 1 and Figure 2, when it is by external abrasive wear shear action, tissue can act synergistically, table shown in attached drawing 7
Face only has small uniform wear trace, avoids because single-phase first wear into is cheated due to the appearance of unstable wear situation.
Embodiment 1
In conjunction with attached drawing, by the composition and ratio requirement of flux-cored wire powder core when production, high carbon ferro-chrome, ferro-niobium, molybdenum-iron, squama are weighed
Piece graphite, ultra micro fine graphite, ferro-boron, ferrosilicon, mid-carbon fe-mn, ultra micro atomized aluminium, reduced iron powder etc., ultra micro fine graphite and ultra tiny
Aluminium powder crosses 300 meshes, other powder all cross 60 meshes.Flux-cored wire is prepared in YHZ-1 flux-cored wire forming machine and is formed.The medicine
Core welding wire outer layer foreskin is H08A cold-rolled strip (width 16mm × thickness 0.36mm, the same below), is equipped with ferroalloy, stone in foreskin
Ink and aluminium powder etc. constitute powder core, and the weight percentage of each powdery components of flux-cored wire powder core is respectively as follows: high carbon ferro-chrome
30%, ferro-niobium 25%, molybdenum-iron 7%, crystalline flake graphite 3%, ultra micro fine graphite 3%, ferro-boron 9%, ferrosilicon 5%, mid-carbon fe-mn 2%,
Ultra micro atomized aluminium 1.0%, reduced iron powder 15%, the powder core filling rate are 45%.
Powder core each component is put into batch mixer and mixes 30 minutes, then rolls mixing as Φ on flux-cored wire forming machine
4.6mm flux-cored wire, with each tube reducing 0.2mm, successively drawing tube reducing is spare to Φ 3.2mm.
It is on 120mm × 80mm × 16mm test plate (panel) (Q235A steel), flux-cored wire is bright with welding machine MZ-1000 self-shield
Arc built-up welding, 410~430A of welding current, other technological parameters are as shown in table 1, and ibid built-up welding forms the second layer and third layer weldering
Seam.The defects of postwelding weld seam flawless and stomata, only micro residue.By bead weld specimen linear cutter be prepared as 57mm ×
25.5mm × 6mm wearability sample after test, tests its wear surface macrohardness with HR-150 Rockwell apparatus.
Abrasion test uses the wheeled abrasion tester of MLS-225B type damp sand rubber, and experimental condition is as follows: rubber wheel is straight
Diameter 178mm, hardness are 60 Shao Er, and added counterweight weighs 2.5 kilograms, and 240 revs/min of rubber wheel speed, mortar ratio was 60 mesh
1500 grams of quartz sands of sieve match 1000 grams of tap water.1000 turns of sample elder generation pre-grinding, is rinsed well, and drying claims initial weight M0, then just
Formula cleans drying after testing 1000 turns, and weigh M1, the absolute weight loss Δ M=M of sample abrasion0-M1.With hypoeutectic shown in comparative example 1
High-chromium alloy sample is standard sample 1#, the absolute absolute weight loss of weight loss/sample of relative wear coefficient ε=standard sample, examination
It tests and the results are shown in Table 2.
1 flux-cored wire self-shield open arc bead-welding technology parameter of table
Embodiment 2
In conjunction with attached drawing, by the composition and ratio requirement of flux-cored wire powder core when production, high carbon ferro-chrome, ferro-niobium, molybdenum-iron, squama are weighed
Piece graphite, ultra micro fine graphite, ferro-boron, ferrosilicon, mid-carbon fe-mn, ultra micro atomized aluminium, reduced iron powder etc., ultra micro fine graphite and ultra tiny
Aluminium powder crosses 300 meshes, other powder all cross 60 meshes.Flux-cored wire is prepared in YHZ-1 flux-cored wire forming machine and is formed.The medicine
Core welding wire outer layer foreskin is H08A cold-rolled strip, and ferroalloy, graphite and aluminium powder etc. are equipped in foreskin and constitutes powder core, the medicine core weldering
The weight percentage of each powdery components of silk powder core is respectively as follows: high carbon ferro-chrome 32%, ferro-niobium 28%, molybdenum-iron 6%, crystalline flake graphite
4%, ultra micro fine graphite 4%, ferro-boron 11%, ferrosilicon 5%, mid-carbon fe-mn 1%, ultra micro atomized aluminium 1.0%, reduced iron powder 8%, institute
Stating powder core filling rate is 44%.
The each component of powder core is put into batch mixer and mixes 30 minutes, then rolls mixing as Φ on flux-cored wire forming machine
4.6mm flux-cored wire, with each tube reducing 0.2mm, successively drawing tube reducing is spare to Φ 3.2mm.
Embodiment 3
In conjunction with attached drawing, by the composition and ratio requirement of flux-cored wire powder core when production, high carbon ferro-chrome, ferro-niobium, molybdenum-iron, squama are weighed
Piece graphite, ultra micro fine graphite, ferro-boron, ferrosilicon, mid-carbon fe-mn, ultra micro atomized aluminium, reduced iron powder etc., ultra micro fine graphite and ultra tiny
Aluminium powder crosses 300 meshes, other powder all cross 60 meshes.The YHZ-1 flux-cored wire that flux-cored wire is manufactured in certain Co., Ltd at
The preparation molding of type machine.The flux-cored wire outer layer foreskin is H08A cold-rolled strip, is equipped with the structures such as ferroalloy, graphite and aluminium powder in foreskin
At powder core, the weight percentage of each powdery components of flux-cored wire powder core be respectively as follows: high carbon ferro-chrome 35%, ferro-niobium 30%,
Molybdenum-iron 6%, crystalline flake graphite 5%, ultra micro fine graphite 2%, ferro-boron 10%, ferrosilicon 4%, mid-carbon fe-mn 2%, ultra micro atomized aluminium
0.5%, reduced iron powder 5.5%, the powder core filling rate are 44%.
Powder core each component is put into batch mixer and mixes 30 minutes, then rolls mixing as Φ on flux-cored wire forming machine
4.6nn flux-cored wire, with each tube reducing 0.2mm, successively drawing tube reducing is spare to Φ 3.2mm.
Comparative example 1
Using homemade hypoeutectic high-chromium alloy flux-cored wire (Φ 3.2mm) in 120mm × 80mm × 16mm test plate (panel)
On (Q235A steel), with three layers of built-up welding, welding current 450A of welding machine MZ-1000 self-shield open arc, other technological parameters such as 1 institute of table
Show.Postwelding weld seam remains the defects of a small amount of slag, flawless and stomata.
The preparation of wearability sample, abrasion test and surface hardness test content are the same as embodiment 1.
Comparative example 2
Using homemade hypereutectic high-chromium alloy flux-cored wire (Φ 3.2mm) in 120mm × 80mm × 16mm test plate (panel)
On (Q235A steel), with three layers of built-up welding, welding current 450A of welding machine MZ-1000 self-shield open arc, other technological parameters such as 1 institute of table
Show.Facing surface has the defects of a small amount of slag, no macroscopic cracking and stomata.
The preparation of wearability sample, abrasion test and surface hardness test content are the same as embodiment 1.
From table 2 it can be seen that a kind of flux-cored wire self-shield based on coordination strengthening effect of the invention is bright
The relative wear coefficient ε of arc hardfacing alloy is 15.21~16.96 times of the self-control high chromium flux-cored wire hardfacing alloy of hypoeutectic, and
It and is 3.12~3.48 times for making hypereutectic high-chromium flux-cored wire hardfacing alloy by oneself.
Comparison diagram 1 and Fig. 3, Fig. 5 and by Fig. 2 and Fig. 4, Fig. 6 it is found that a kind of medicine based on coordination strengthening effect
The tissue of core welding wire, the flux-cored wire self-shield open arc hardfacing alloy specifically includes that matrix by fine platy martensite and austenite
It is composed, hard phase includes the niobium carbide/NbC particle being precipitated in situ and six carbon boronations 20 being discontinuously distributed along crystal mesh shape
Three metallic elements/M23(C,B)6Phase, this makes matrix and hard phase when resistance abrasive grain is inserted into cutting abrasion, can cooperate with work
With solving traditional hypoeutectic alloy matrix and wear phase independent role and the disadvantage that keeps wearability not strong, also avoided total
The shortcomings that peritectic alloy is initially formed peeling pit, increased wear because containing a certain number of brittleness ledeburite eutectics.
The Abrasive Resistance of Stubble-cleaning of 2 embodiment and comparative example hardfacing alloy of table
The wear morphology of hardfacing alloy shown in comparison diagram 7 and Fig. 8, Fig. 9 is it is found that under same abrasive conditions, homemade Asia
Eutectic high-chromium alloy surface grooves are more, form micro-flaw due to more than the eutectic, and then peeling pit occur；Homemade hypereutectic high-chromium
There is regional area embrittlement and forms peel strip in alloy.A kind of flux-cored wire based on coordination strengthening effect of the invention is certainly
It protects open arc hardfacing alloy wear surface scratch shallow, though surface has twice strength to roll the shallow trench to be formed, has no micro- and split
Line, hard phase and matrix abrasion condition are almost the same, whole uniformly micro abrasion, do not occur local microcell preferential wear and
Aggravate overall wear situation.The wear weight loss in conjunction with shown in table 2 is as a result, clearly demonstrate that one kind of the invention is strong based on coordination
The flux-cored wire self-shield open arc hardfacing alloy for changing effect has especially excellent wearability.
Claims (3)
1. a kind of self-shield open arc flux-cored wire based on coordination strengthening effect, it is characterised in that: it is cold with H08A
Rolling thin steel strip is outer layer foreskin, and powdery components are equipped in the foreskin and constitute powder core, self-shield open arc built-up welding forms a kind of organized
The small grains alloy of cooperative reinforcing effect, the alloy structure include that fine platy martensite combines matrix, original with austenitic duplex
Niobium carbide phase and six carbon boronations, the 23 metallic element phase along brilliant discontinuously net distribution is precipitated in position；
The weight percentage of each powdery components of flux-cored wire powder core is respectively as follows:
The high carbon ferro-chrome that 30~35% chrome content is 68~72%, phosphorus content is 8%；
The ferro-niobium that 25~30% niobium content is 60%；
The molybdenum-iron that 5~7% amount containing molybdenum is 50%；
3~5% phosphorus content is not less than 98% crystalline flake graphite；
2~4% phosphorus content is not less than 99% 300 mesh ultra micro fine graphites；
The ferro-boron that 9~11% boron content is 18%；
The ferrosilicon that 4~5% silicon content is 40~47%；
The mid-carbon fe-mn that 1~3% manganese content is 78~85%, phosphorus content is 1.5%；
0.5~1.0% aluminum content is not less than 99% 300 mesh ultra micro atomized aluminiums；
Surplus is the reduced iron powder that iron-content is not less than 98%；
The filling rate of the flux-cored wire powder core is 44~46%.
2. a kind of self-shield open arc flux-cored wire based on coordination strengthening effect according to claim 1, special
Sign is: in flux-cored wire powder core, the high carbon ferro-chrome, ferro-niobium, molybdenum-iron, crystalline flake graphite, ferro-boron, ferrosilicon, mid-carbon fe-mn, reduction
The fineness of iron powder is 60 mesh.
3. a kind of self-shield open arc flux-cored wire based on coordination strengthening effect according to claim 1, special
Sign is: welding current controlling value is 410~430A, 19~21mm/min of speed of welding.
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| CN101406994A (en) * | 2007-10-10 | 2009-04-15 | 中冶集团建筑研究总院 | High-carbon high-chromium high-niobium cast iron self-protecting flux-cored wire |
| JP5387168B2 (en) * | 2009-06-26 | 2014-01-15 | 新日鐵住金株式会社 | Welding wire for high strength steel with flux and manufacturing method thereof |
| CN104325232A (en) * | 2014-10-29 | 2015-02-04 | 李永锋 | Wear-resistant overlaying flux-cored wire |
| CN104708234A (en) * | 2013-12-11 | 2015-06-17 | 北京有色金属研究总院 | Iron-based self-protection flux-cored wire, surfacing alloy manufactured with iron-based self-protection flux-cored wire and method for manufacturing iron-based self-protection flux-cored wire |
| CN105537797A (en) * | 2015-11-27 | 2016-05-04 | 湘潭大学 | Carbon-controlling and toughening type self-shielded open-arc high-boron surfacing flux-cored wire |
| CN106166654A (en) * | 2016-07-28 | 2016-11-30 | 江苏科技大学 | A kind of very high content niobium Strengthening and Toughening self-protecting flux-cored wire for overlaying welding and preparation method thereof |
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| CN101406994A (en) * | 2007-10-10 | 2009-04-15 | 中冶集团建筑研究总院 | High-carbon high-chromium high-niobium cast iron self-protecting flux-cored wire |
| JP5387168B2 (en) * | 2009-06-26 | 2014-01-15 | 新日鐵住金株式会社 | Welding wire for high strength steel with flux and manufacturing method thereof |
| CN104708234A (en) * | 2013-12-11 | 2015-06-17 | 北京有色金属研究总院 | Iron-based self-protection flux-cored wire, surfacing alloy manufactured with iron-based self-protection flux-cored wire and method for manufacturing iron-based self-protection flux-cored wire |
| CN104325232A (en) * | 2014-10-29 | 2015-02-04 | 李永锋 | Wear-resistant overlaying flux-cored wire |
| CN105537797A (en) * | 2015-11-27 | 2016-05-04 | 湘潭大学 | Carbon-controlling and toughening type self-shielded open-arc high-boron surfacing flux-cored wire |
| CN106166654A (en) * | 2016-07-28 | 2016-11-30 | 江苏科技大学 | A kind of very high content niobium Strengthening and Toughening self-protecting flux-cored wire for overlaying welding and preparation method thereof |
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