CN108620763B - A kind of high boron flux-cored wire of self-shield open arc - Google Patents
A kind of high boron flux-cored wire of self-shield open arc Download PDFInfo
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- CN108620763B CN108620763B CN201810414218.XA CN201810414218A CN108620763B CN 108620763 B CN108620763 B CN 108620763B CN 201810414218 A CN201810414218 A CN 201810414218A CN 108620763 B CN108620763 B CN 108620763B
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- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
Abstract
The invention discloses a kind of high boron flux-cored wires of self-shield open arc.The flux-cored wire uses H08A cold rolling thin steel strip for outer layer foreskin; and powder core is constituted in being equipped with high carbon ferro-chrome, boron carbide, ferrotianium, ferrosilicon, crystalline flake graphite and fine aluminium powder and reduced iron powder in foreskin; self-shield open arc built-up welding is formed to come into being (Fe, Cr)23(C,B)6The ferrite and a small amount of isolated (Fe, Cr) dispersed being distributed for main wear phase, comparatively high amts along cellular crystal circle3The institutional framework of (C, B) equal composition.The flux-cored wire uses the combination deoxidation mode of the mid-term deoxidation of precedent desoxydation, ferrotianium including fine aluminium powder and the later period deoxidation of ferrosilicon, promotes born of the same parents' shape (Fe, Cr) in the hardfacing alloy as main wear phase23(C,B)6Formation, and its volume fraction is made to reach 90% or more.Under the abrasive wear resistance operating condition of certain impact load, which can be used for components self-shield open arc build-up wear-resistant layer.
Description
Technical field
The invention belongs to flux-cored wire technical fields, and in particular to one kind is with born of the same parents' shape M23(C,B)6Xiang Weizhu wear phase
Institutional framework the high boron flux-cored wire of self-shield open arc.
Background technique
Boron alloy is primarily due to the alloy and is easy to be precipitated a certain number of Fe as a kind of economy wear-resistant material2B
The high boride such as (1100~1500HV) microhardnesses and with preferable Abrasive Resistance of Stubble-cleaning, reduce W, Mo and Nb
It is consumed etc. valuable constituent element, obtains research in recent years and pay attention to, and obtain application.
Boron alloy preparation method has: casting, built-up welding and thermal expansion are seeped etc..But casting boron alloy makes because heating power influence is big
Boron content it is limited, thermal expansion boronising alloy-layer is relatively thin.In contrast, constraint (restraint) degree suffered by hardfacing alloy is small, thickness, especially boron content
3.8% (mass percent) or more can be significantly promoted to.Thus, the tissue and performance of boron hardfacing alloy, which have, significantly promotes sky
Between, wherein it is the most convenient with the adjustment of flux-cored wire self-shield open arc soldering method ingredient tissue, it can get ingredient, the tissue of boron alloy
It is more broad with performance.
However, the high boron flux-cored wire of self-shield built-up welding because of processing performance requirement generally requires that appropriate graphitic composition is added, with
Increase spontaneous protective gas amount, and the drawing property of flux-cored wire need to meet production requirement.This makes in boron hardfacing alloy that there are one
A outstanding problem: because of its main wear phase (Fe, Cr)2B can hardly dissolve in carbon atom, and carbon atom in melt is promoted to be squeezed to this
Around phase, a large amount of metamorphosis brittleness eutectic α-Fe+Fe are formed3(C, B) and cause alloy excessively crisp.In addition, in high chromium class boron alloy,
Its main wear phase is (Fe, the Cr) of hexagonal lattice structure7C3Phase forms compound carbon boride phase (Fe, Cr) after dissolving in boron atom7
(C,B)3, because of B atomic radiusThan C atomic radiusMuch bigger, only minute quantity B can dissolve in the phase, and because of the phase
Distortion of lattice causes phase internal stress to increase, and is easy to fragmentation in plus load percussion and peels off, and a large amount of B atoms of remaining in melt
It can only participate in forming Fe3(C, B) eutectic phase.Moreover, the wearability of hardfacing alloy is related with the volume fraction of main wear phase,
The volume fraction of main wear phase is higher, and alloy just has a possibility that more high-wearing feature.But main wear phase phase toughness is relatively low,
Fragmentation is peeled off reduces Wear Resistance again.
Fe23(C,B)6Belong to complicated face-centered cubic lattice structure, the filling space of tunable C and B atom, and the crystalloid
Lattice structure slip system is more, can by way of plastic deformation relaxation phase internal stress.Thus, one kind is researched and developed with Fe23(C,B)6Based on
The high boron flux-cored wire of the self-shield open arc of wear phase can meet its hardfacing alloy in the case where there is shock loading abrasive wear operating condition
Still with the demand of excellent abrasive resistance.
Summary of the invention
It is an object of the invention to for drawbacks described above existing for existing flux-cored wire boron hardfacing alloy, providing one kind both made
The main wear phase of its hardfacing alloy has higher toughness, and is allowed to possess the high boron flux-cored wire of higher abrasion resistance.
Above-mentioned purpose of the invention is realized by the following technical solutions: the high boron built-up welding medicine core of the self-shield open arc
Welding wire, it constitutes powder core in being equipped with various powdery components in the foreskin using H08A cold rolling thin steel strip as outer layer foreskin, through self-insurance
Open arc built-up welding is protected, is formed with six carbon boronations, 23 siderochrome/(Fe, Cr)23(C,B)6For the built-up welding of the institutional framework of main wear phase
Alloy；
The weight percentage that the high boron flux-cored wire powder core respectively forms powdery components be respectively as follows: 28~32% containing chromium
High carbon ferro-chrome/FeCr70C8.0 that amount is 68~72%, phosphorus content is 8%；14~16% boron carbide/B4C；5~10%
Ferrotianium/FeTi30A that titaniferous amount is 25~35%；Ferrosilicon/FeSi45 that 4~6% silicon content is 40~47%；3.5~4%
Phosphorus content be not less than 98% crystalline flake graphite/C；2.5~3% aluminum content is not less than 99% fine aluminium powder/Al；Surplus
It is not less than 98% reduced iron powder/Fe for iron-content；The filling rate of the flux-cored wire powder core is 45~48%.
In order to advanced optimize technical effect, in the flux-cored wire powder core: high carbon ferro-chrome, boron carbide, ferrotianium, ferrosilicon,
Crystalline flake graphite, reduced iron powder fineness be 60 mesh；The fineness of fine aluminium powder is 300 mesh.
A kind of high boron flux-cored wire of self-shield open arc of the present invention, using including fine aluminium powder precedent desoxydation, ferrotianium
The combination deoxidation mode of mid-term deoxidation and the deoxidation of ferrosilicon later period promotes born of the same parents of the flux-cored wire hardfacing alloy as main wear phase
Six carbon boronation of shape, 23 siderochrome/(Fe, Cr)23(C,B)6The formation of phase.
In order to advanced optimize technical effect, fine aluminium powder is dried two hours at 50~70 DEG C, contained sufficiently to remove
Moisture and obtain good combustibility；And then using the oxygen content in its good flammable sufficiently removal medicine core, make the medicine core
The molten drop formation stages inner melt of wire tip forms strong reducing atmosphere.
In order to advanced optimize technical effect, mid-term is carried out in stage droplet transfer and molten bath preliminary stage using ferrotianium and is taken off
Oxygen, this makes the atmosphere strong in droplet transfer and the molten bath preliminary stage flux-cored wire built-up welding melt composition reproducibility.
In order to advanced optimize technical effect, precipitation desoxydation is carried out in molten bath later stage using ferrosilicon, this makes the medicine core
Welding wire built-up welding melt forms the strong atmosphere of reproducibility in molten bath later stage.
In order to advanced optimize technical effect, when the high boron flux-cored wire self-shield open arc built-up welding, current control value is 390
~410A, 14~16mm/min of speed of welding.
A kind of high boron flux-cored wire of self-shield open arc of the present invention, self-shield open arc hardfacing alloy are formed by mainly
Wear phase is born of the same parents' shape (Fe, Cr)23(C,B)6Phase, the phase and molten C and B atom, effectively inhibit alloy mutually exclusive with boron because of carbon
Excessively crisp effect caused by opposition, can be applied to the abrasive wear operating condition components build-up wear-resistant layer of shock loading, as S-shaped is mixed
Solidifying soil conveying 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) main wear phase and its form are different: using (Fe, Cr)23(C,B)6It is in born of the same parents' shape, phase toughness as main wear phase
It is good；Meanwhile the cellular crystal is interior or a small amount of titanium carbide/TiC is precipitated as auxiliary wear phase in crystal boundary.This in high-chromium alloy be in six
Nascent three carbonizations, seven metallic elements/M of side shape7C3With nascent two metallic elements of the boronation/M in high boron alloy being in quadrangle2B's
Main wear phase type and its form are significantly different.
(2) microhardness of main wear phase is significantly different: born of the same parents' shape (Fe, Cr)23(C,B)6Microhardness value range be 850
~944HV0.1, hence it is evident that it is lower than M21100~1500HV of B0.1And M7C31200~1600HV0.1Microhardness range, thus have
Standby good phase toughness can make the main wear phase of alloy bear higher plus load impact and peel off without fragmentation.
(3) volume fraction of main wear phase is different: nascent (Fe, Cr) as main wear phase23(C,B)6Volume fraction
Up to 90% or more, much higher than M of the general high chromium or high boron alloy as main wear phase7C3Or M220~60% or so of B
Volume fraction.
(4) born of the same parents' shape brilliant tissue that hands down is different: high boron flux-cored wire of the invention, hardfacing alloy born of the same parents' shape phase are organized along crystalline substance
And non-carbide, and by three siderochrome of carbon boronation/(Fe, the Cr) of the ferrite of comparatively high amts and a small amount of isolated dispersion3(C, B) type carbon
Boride composition.
(5) hardfacing alloy macrohardness fluctuation range is different: the macrohardness of this flux-cored wire hardfacing alloy is
58.0~60HRC, hardness number are balanced, and a kind of such alloy rigidity value fluctuation range only 1~2HRC is far below a kind of high chromium or height
3~6HRC of fluctuation range of boron alloy 57~65HRC macrohardness value, and its wearability is better than commercially available high chromium flux-cored wire.
(6) material cost for obtaining the main wear phase of high-volume fractional is different: this flux-cored wire only with high carbon ferro-chrome,
The cheap components such as ferroalloy and boron carbide particles such as ferrosilicon, ferrotianium are used cooperatively, and are just obtained volume fraction and are up to 90% or more
And it can be used as nascent (Fe, the Cr) of main wear phase23(C,B)6, the cost of material is low and wearability is good, this makes the high boron medicine core weldering
Silk cost performance is extremely excellent.
Detailed description of the invention
Fig. 1 is the tissue morphology figure of the high boron flux-cored wire open arc hardfacing alloy of the present invention.
Fig. 2 is the phase composition figure of high boron flux-cored wire open arc hardfacing alloy shown in Fig. 1.
Fig. 3 is the tissue morphology figure for the high boron flux-cored wire open arc hardfacing alloy that Ti content is high in comparative example 2.
Fig. 4 is the phase composition figure of the high high boron flux-cored wire open arc hardfacing alloy of Ti content shown in Fig. 3.
Fig. 5 is the wear morphology figure of high boron flux-cored wire open arc hardfacing alloy shown in Fig. 1.
Fig. 6 is the wear morphology figure of the high high boron flux-cored wire open arc hardfacing alloy of Ti content shown in Fig. 3.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
The high boron flux-cored wire diameter of self-shield open arc of the invention is Φ 3.2mm, by medicine core and external portion two
Divide and constitute, wherein external portion selects H08A cold rolling thin steel strip；Medicine core is then made of following types of powders material: 28~32%
Chrome content be 68~72%, high carbon ferro-chrome/FeCr70C8.0 that phosphorus content is 8%；14~16% boron carbide/B4C；5~
Ferrotianium/FeTi30A that 10% titaniferous amount is 25~35%；Ferrosilicon/FeSi45 that 4~6% silicon content is 40~47%；
3.5~4% phosphorus content is not less than 98% crystalline flake graphite/C；2.5~3% aluminum content is not less than 99% fine aluminium
Powder/Al；Surplus is reduced iron powder/Fe that iron-content is not less than 98%；The filling rate of flux-cored wire powder core is 45~48%.
Before flux-cored wire molding, fine aluminium powder is first crossed into 300 meshes, remaining powdery components crosses 60 meshes, then
All powder component is uniformly mixed.Then the mixed-powder is poured into stainless steel pallet, spread out and makes powder accumulation height
No more than 15mm, it is put into drying oven and is warming up to 50~70 DEG C and keeps the temperature 2 hours.Medicinal powder is come out of the stove, immediately with H08A cold rolling
The crin that thin steel strip roll forming on flux-cored wire forming machine is Φ 4.6mm, with each tube reducing 0.2mm, by wire drawing die by
It is spare that step is drawn to Φ 3.2mm.
By the self-shield open arc welding on Q235A steel plate with MZ-1000 welding machine of the flux-cored wire of Φ 3.2mm, first layer is formed
Weld seam.100~150 DEG C are air-cooled to hereinafter, the flux-cored wire open arc self-shield built-up welding second layer, postwelding are air-cooled to weld seam.
The main function that fine aluminium powder is added in flux-cored wire is to fill molten drop in advance using its strong combustibility
Divide deoxidation, carries out mid-term deoxidation in stage droplet transfer and molten bath preliminary stage followed by ferrotianium, appropriate ferrosilicon is recycled to exist
Molten bath later stage carries out precipitation desoxydation, this makes the flux-cored wire built-up welding melt in molten drop formation, droplet transfer and molten bath stage
It is respectively formed the strong atmosphere of reproducibility, is inhibited because of boron carbide/B4The premature decomposition of C particle and lead to carbon in melt, boron atom height
Discrete, grouped accumulation phenomenon appearance promotes six carbon boronation of born of the same parents' shape, 23 siderochrome/(Fe, the Cr) as main wear phase23(C,
B)6The formation of phase.Fine aluminum oxide/Al that fine aluminium powder oxidation is formed2O3Particle is dispersed under blow force of arc effect
It is excluded at flue dust.
Based on this, the high boron flux-cored wire hardfacing alloy obtain can be used as main wear phase and 90% or more volume fraction just
Raw (Fe, Cr)23(C,B)6Design principle can be summarized as: distribute flux-cored wire component rationally, that is, appropriate boron carbide/B be added4C
Component simultaneously cooperate addition combination deoxidier, including precedent desoxydation effect fine aluminium powder, mid-term deoxidation ferrotianium and
The ferrosilicon of later period deoxidation makes built-up welding melt be respectively formed strong reproducibility in molten drop formation, droplet transfer and molten bath stage
Atmosphere, inhibits caused by the premature decomposition because of boron carbide that C and B atom high is discrete, appearance of grouped accumulation phenomenon, and promotes born of the same parents
Shape (Fe, Cr)23(C,B)6The formation of phase；The regulation extra carbon atom of melt is precipitated using a small amount of titanium carbide/TiC；Appropriate chromium is added
Iron component makes high-carbon boron atom cluster be dissolved appropriate Cr and promote its stability, and control can spread the carbon or boron atom number of crystal boundary
Amount promotes the high-carbon boron atom cluster for being dissolved chromium to form born of the same parents' shape primary phase (Fe, Cr)23(C,B)6, and in born of the same parents' shape phase crystal boundary shape
At the ferrite of comparatively high amts and (Fe, the Cr) of a small amount of isolated dispersion3(C, B) phase composition along brilliant institutional framework.
Embodiment 1
When production by the powder core composition and ratio requirement of above-mentioned flux-cored wire weigh high carbon ferro-chrome, boron carbide, ferrotianium, ferrosilicon,
Crystalline flake graphite, fine aluminium powder and reduced iron powder etc., wherein fine aluminium powder first crosses 300 meshes, then other powder groups of medicine core
Divided 60 meshes.Then medicine core all powder component is uniformly mixed, then mixed-powder is poured into rustless steel container, spread out simultaneously
So that powder accumulation height is no more than 15mm, it is put into drying oven and is warming up to 50~70 DEG C and keeps the temperature 2 hours.
Mixed powder is come out of the stove, with i.e. by it in YHZ-1 flux-cored wire forming machine compression moulding.The flux-cored wire outer layer foreskin
For H08A cold-rolled strip (width 16mm × thickness 0.36mm, the same below), in being equipped with ferroalloy, boron carbide, scale stone in foreskin
Ink, fine aluminium powder and reduced iron powder etc. constitute powder core.Its powder core forms (weight percent) are as follows: high carbon ferro-chrome 28%, carbonization
Boron 15%, ferrotianium 7%, ferrosilicon 5%, crystalline flake graphite 4%, fine aluminium powder 3%, reduced iron powder 38%, the powder core filling rate
It is 46%.Rolling is Φ 4.6mm flux-cored wire after each component of powder core is mixed evenly, with each tube reducing 0.2mm, then successively
Drawing tube reducing is Φ 3.2mm welding wire.
In 120mm × 80mm × 16mm test plate (panel) (Q235A steel) by flux-cored wire welding machine MZ-1000 self-shield open arc
Weldering forms first layer weld seam；100~150 DEG C are cooled to hereinafter, the flux-cored wire built-up welding deposition is formed second layer weldering to weld seam
Seam.
The defects of flux-cored wire self-shield open arc bead-welding technology parameter is as shown in table 1, postwelding weld seam flawless and stomata, only
There is micro residue.Bead weld specimen linear cutter is prepared as 57mm × 25.5mm × 6mm wearability sample, and with the Lip river HR-150
Family name's hardometer tests its surface macrohardness.
1 flux-cored wire self-shield open arc bead-welding technology parameter of table
Abrasion test uses the wheeled abrasion tester of MLS-225 type damp sand rubber, and experimental condition is as follows: rubber wheel diameter
178mm, hardness are 60 Shao Er, and added counterweight weighs 2.5 kilograms, and 240 revs/min of rubber wheel speed, mortar ratio is 40~60 mesh
1500 grams of quartz sands match 1000 grams of tap water.1000 turns of sample elder generation pre-grinding, is rinsed well, and drying claims initial weight M0, then formal examination
Drying is cleaned after testing 1000 turns, weigh M1, the absolute weight loss Δ M=M of sample abrasion0-M1。
It is opposite to grind below in face of the 1# bead weld specimen of commercially available rich chromium cast iron flux-cored wire described in ratio 1 as standard sample
The absolute absolute weight loss of weight loss/sample of coefficient ε=standard sample is damaged, test result is shown in Table 2.
Tissue morphology figure and phase composition the figure difference of the flux-cored wire alloy surface of the present embodiment are as shown in Figure 1 and Figure 2,
The wear morphology figure of flux-cored wire is as shown in Figure 5.
Embodiment 2
High carbon ferro-chrome, boron carbide, ferrotianium, ferrosilicon, squama are weighed by the powder core composition and ratio requirement of above-mentioned flux-cored wire when making
Piece graphite, fine aluminium powder and reduced iron powder etc., wherein fine aluminium powder needed 300 meshes, and then other powder of medicine core cross 60
Mesh.Medicine core all powder component is uniformly mixed, then mixed-powder is poured into rustless steel container, spread out and makes powder accumulation
Height is no more than 15mm, it is put into drying oven and is warming up to 50~70 DEG C and keeps the temperature 2 hours.
Mixed powder is come out of the stove, with i.e. by it in YHZ-1 flux-cored wire forming machine compression moulding.The flux-cored wire outer layer foreskin
For H08A cold-rolled strip, constituted in being equipped with ferroalloy, boron carbide, crystalline flake graphite, fine aluminium powder and reduced iron powder etc. in foreskin
Powder core.Its powder core forms (weight percent) are as follows: high carbon ferro-chrome 30%, boron carbide 16%, ferrotianium 10%, ferrosilicon 4%, scale stone
Black 3.5%, fine aluminium powder 2.5%, reduced iron powder 34%, the powder core filling rate are 47%.The each component mixing of powder core is stirred
Rolling is Φ 4.6mm flux-cored wire after mixing uniformly, and with each tube reducing 0.2mm, then successively drawing tube reducing is Φ 3.2mm welding wire.
Abrasion test content is the same as embodiment 1.
Embodiment 3
High carbon ferro-chrome, boron carbide, ferrosilicon, ferrotianium, squama are weighed by the powder core composition and ratio requirement of above-mentioned flux-cored wire when making
Piece graphite, fine aluminium powder and reduced iron powder etc., wherein fine aluminium powder needed 300 meshes, and then other powder of medicine core cross 60
Mesh.Medicine core all powder component is uniformly mixed, then mixed-powder is poured into rustless steel container, spread out and makes powder accumulation
Height is no more than 15mm, it is put into drying oven and is warming up to 50~70 DEG C and keeps the temperature 2 hours.
Mixed powder is come out of the stove, with i.e. by it in YHZ-1 flux-cored wire forming machine compression moulding.The flux-cored wire outer layer foreskin
For H08A cold-rolled strip, constituted in being equipped with ferroalloy, boron carbide, crystalline flake graphite, fine aluminium powder and reduced iron powder etc. in foreskin
Powder core.Its powder core forms (weight percent) are as follows: high carbon ferro-chrome 32%, boron carbide 14%, ferrotianium 5%, ferrosilicon 6%, scale stone
Black 4%, fine aluminium powder 3%, reduced iron powder 36%, the powder core filling rate are 48%.The each component of powder core is mixed equal
Rolling is Φ 4.6mm flux-cored wire after even, and with each tube reducing 0.2mm, then successively drawing tube reducing is Φ 3.2mm welding wire.
Abrasion test content is the same as embodiment 1.
Comparative example 1
Using commercially available rich chromium cast iron flux-cored wire (Φ 3.2mm) at 120mm × 80mm × 16mm test plate (panel) (Q235A steel)
On, with two layers of built-up welding of welding machine MZ-1000 self-shield open arc, technological parameter is the same as table 1.Built-up welding rear surface remains a small amount of slag, and
There is the transversal crack at the interval 10~18mm.
Abrasion test content is the same as embodiment 1.
Comparative example 2
Using flux-cored wire, medicine core composition are as follows: high carbon ferro-chrome 30%, boron carbide 15%, ferrotianium 35%, ferrosilicon 6%, squama
Piece graphite 4%, fine aluminium powder 3%, reduced iron powder 7%, the powder core filling rate are 48%.Other content is the same as embodiment 1.
The flux-cored wire is bright with welding machine MZ-1000 self-shield on 120mm × 80mm × 16mm test plate (panel) (Q235A steel)
Two layers of arc built-up welding, bead-welding technology parameter is the same as table 1.Built-up welding rear surface remains slag, and quantity is bigger than embodiment 1-3, pore-free
The defects of, but have a small amount of micro-crack.
Abrasion test content is the same as embodiment 1.
The tissue morphology figure and phase composition figure of the flux-cored wire open arc hardfacing alloy of comparative example 2 are respectively such as Fig. 3 and Fig. 4 institute
Show, the wear morphology figure of flux-cored wire self-shield open arc hardfacing alloy is as shown in Figure 6.
From table 2 it can be seen that the relative wear coefficient ε of high boron flux cored wire hardfacing alloy of the invention is commercially available Gao Ge
2.70~3.00 times of cast iron flux-cored wire hardfacing alloy, and be to make the high high boron flux-cored wire hardfacing alloy of Ti content by oneself
1.03~1.15 times, this illustrates that the high boron flux-cored wire has good wearability.
By Fig. 1 and Fig. 2 it is found that the tissue of the high boron flux-cored wire self-shield open arc hardfacing alloy of the present invention is mainly by born of the same parents' shape
(Fe,Cr)23(C,B)6, the ferrite that is distributed along the netted or dendroid of cellular crystal circle of minute quantity TiC phase, comparatively high amts and few
(Fe, the Cr) of the isolated dispersion of amount3(C, B) composition.
For comparative example 2 in addition to ferrotianium content is much higher than the high boron flux-cored wire of the present invention, other medicine core components are essentially identical.Pass through
Fig. 3 and Fig. 4 is it is found that the TiC phase amounts of particles of black contained by the high high boron hardfacing alloy tissue of Ti content is more, main wear phase
By blocky (Fe, Cr)2B and born of the same parents' shape (Fe, Cr)23(C,B)6Composition.Comparison diagram 3 and Fig. 1 it is found that comparative example 2 flux-cored wire heap
(Fe, Cr) contained by soldering payment organization3The quantity of (C, B) eutectic hard phase is significantly more than the high boron flux-cored wire hardfacing alloy of the present invention
The contained phase.
It is compared with tissue morphology figure shown in Fig. 3, in conjunction with the micro-hardness testing and figure to cellular structure shown in Fig. 1
The phase composition characterization result of Fig. 1 shown in 2, it may be determined that white born of the same parents' shape of the high boron flux-cored wire hardfacing alloy of the present invention be mutually (Fe,
Cr)23(C,B)6, and as main wear phase.
The wear morphology of hardfacing alloy shown in comparison diagram 5 and Fig. 6 is of the invention it is found that under the conditions of identical wear test
High boron flux cored wire wear surface scratch is uniform, and wear mechanism is mainly the micro cutting of abrasive grain, and the titanium of comparative example 2 contains
Measure that high high boron flux cored wire wear surface peeling pit is more, two kinds of wear mechanisms of micro cutting of micro- peeling and abrasive grain are simultaneously
It deposits.The above result shows that the high boron flux-cored wire of self-shield open arc built-up welding of the invention possesses good wearability and compared with high-ductility
Property, it can be used for having components self-shield open arc build-up wear-resistant layer under shock loading abrasive wear operating condition.
The Abrasive Resistance of Stubble-cleaning of 2 embodiment hardfacing alloy of table
Claims (5)
1. a kind of high boron flux-cored wire of self-shield open arc, it is characterised in that: it using H08A cold rolling thin steel strip as outer layer foreskin,
And powder core is constituted in being equipped with various powdery components in the foreskin, through self-shield open arc built-up welding, formed with six carbon boronation 20 of born of the same parents' shape
The hardfacing alloy of the institutional framework of three siderochrome Xiang Weizhu wear phases；
The chrome content that the weight percentage of each powdery components of powder core is respectively as follows: 28~32% is 68~72%, phosphorus content is
8% high carbon ferro-chrome；14~16% boron carbide；The ferrotianium that 5~10% titaniferous amount is 25~35%；4~6% silicon content is 40
~47% ferrosilicon；3.5~4% phosphorus content is not less than 98% crystalline flake graphite；2.5~3% aluminum content is not less than the 300 of 99%
Mesh fine aluminium powder；Surplus is the reduced iron powder that iron-content is not less than 98%；The filling rate of the flux-cored wire powder core be 45~
48%。
2. the high boron flux-cored wire of self-shield open arc according to claim 1, it is characterised in that: the flux-cored wire powder core
In, the high carbon ferro-chrome, boron carbide, ferrotianium, ferrosilicon, crystalline flake graphite, reduced iron powder fineness be 60 mesh.
3. the high boron flux-cored wire of self-shield open arc according to claim 1, it is characterised in that: the flux-cored wire powder
Each powdery components of core are obtained after drying two hours at 50~70 DEG C.
4. the high boron flux-cored wire of self-shield open arc according to claim 1, it is characterised in that: using including fine
The combination deoxidation mode of aluminium powder precedent desoxydation, the deoxidation of ferrotianium mid-term and the deoxidation of ferrosilicon later period.
5. the high boron flux-cored wire of self-shield open arc according to claim 1, it is characterised in that: when built-up welding, electric current control
Value processed is 390~410A, 14~16mm/min of speed of welding.
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