CN108747083A - A kind of high boron flux-cored wire and its application process of the wear-resisting phase of two-phase complex intensifying master - Google Patents
A kind of high boron flux-cored wire and its application process of the wear-resisting phase of two-phase complex intensifying master Download PDFInfo
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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
- B23K35/22—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
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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
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
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Abstract
The invention discloses a kind of high boron flux-cored wire of wear-resisting phase of two-phase complex intensifying master and its application processes.The flux-cored wire uses H08A cold rollings thin steel strip for outer layer foreskin; and constitute powder core in being equipped with high carbon ferro-chrome, ferro-boron, boron carbide, molybdenum-iron, ferromanganese, crystalline flake graphite, ferrosilicon and reduced iron powder in foreskin; through self-shield open arc built-up welding, a kind of hardfacing alloy of the wear-resisting phase of two-phase complex intensifying master is formed.By distributing flux-cored wire component, the main wear-resisting mutually multi-element alloyed toughening mode of cooperation, and the coordinated regulation method of the built-up welding parameter such as applied voltage, electric current and speed of welding rationally, it is formed and tends to vertical sink flows with weld pool surface, to by (Fe, Cr, Mn)2Nuclear phase and its outside (Fe, Cr, Mn, Mo) in B23(C,B)6The wear-resisting phase of master for coating phase composition is in directional profile.The high boron flux-cored wire hardfacing alloy has excellent Abrasive Resistance of Stubble-cleaning due to master's wear-resisting phase that it has volume fraction to reach 85% or more, and can be used for sandblasting steel pipe inner wall build-up wear-resistant alloy-layer.
Description
Technical field
The invention belongs to flux-cored wire technical fields, and in particular to a kind of high boron of the wear-resisting phase of two-phase complex intensifying master
Flux-cored wire and its application process.
Background technology
According to incompletely statistics, the loss that China causes mechanized equipment to fail because of abrasion, corrosion every year accounts for about current year GDP's
9.5%, material technology is increased with built-up welding and remanufactures failure part, this has the advantages of low-carbon, environmental protection and sustainable development, extremely agrees with
China creates the industry demand of " resource-conserving, environmentally friendly " amphitypy society.The wearability of hardfacing alloy depends on its institute
Phase size containing hard, form, distribution, quantity such as are even orientated at the factors, wherein what is be affected has hard phase size, quantity and take
To etc..The nascent hard phase of high-volume fractional and large-size can increase substantially the wearability of alloy, because it plays wearability
Leading role and be referred to as " main wear-resisting phase ".
The mainstream type of hardfacing alloy includes following two：High chromium series and high boron system, lead wear-resisting phase be respectively (Fe,
Cr)7C3(Fe, Cr)2B.Compared with high chromium series alloy, solubility of the high boron alloy because of boron in ferrite/α-Fe is less than
0.0004% (mass percent, similarly hereinafter) also only has 0.02% in the highest solubility of austenite/γ-Fe, and the atom of boron is partly
Diameter (0.097nm) than carbon atomic radius (0.077nm) greatly, cause its diffusive migration resistance big.Thus, boron is more easy to than carbon atom
Hard phase is formed, to make its alloy obtain higher wearability.Moreover, Cr, Ni, W, Mo, Nb needed for high boron alloy etc.
Alloying element content can be substantially reduced than high-chromium alloy, thus the material cost of wear part can be greatly lowered, and have warp
The applicable outstanding feature of Ji.
Currently, high boron alloy based on casting and forming, is prepared less with overlaying method.But casting belongs to liquid metal
Global formation, constraint (restraint) degree is big when melt solidification and crystallization, and the residual stress caused by thermal strain is big, and alloy crack sensibility is high.Cause
This, casting boron alloy boron content is limited to 1.5% hereinafter, belong to hypoeutectic structure structure mostly, is typically characterised by boron atom
The institutional frameworks such as netted or dendroid boride eutectic are formed at the defects of being diffused into born of the same parents' shape α-Fe matrix crystal boundaries.Due to born of the same parents' shape
The phase amounts such as α-Fe are more, scale is big and partially soft, and wearability is still undesirable, and the wear-resisting potentiality of high boron alloy fail fully to dig
Pick.
Hardfacing alloy is prepared using successively deposition accumulation mode, and suffered constraint (restraint) degree is little when melt solidification and crystallization, can make
The high boron alloy of standby high-volume fractional and the wear-resisting phase of large-size master, to extend the service life of wear part.But high boron
It is (Fe, the Cr) of alloy2(Fe, the Cr) of the wear-resisting phase of B master and high-chromium alloy7C3Main wear-resisting phase is compared, because its boron atom ratio is big,
Property it is crisp, when alloy carbon content is high, this mutually it is more crisp, this is needed to be improved its (Fe, Cr)2The toughness of the wear-resisting phase of B master.
In addition, the wear-resisting phase of the master of hardfacing alloy can improve its wearability in directional profile.In general, to make as the wear-resisting phase of master
Hard phase be in directional profile, the devices such as water cooling directional solidification, electromagnetic agitation need to be added, this make welding operation become cumbersome, and
Increase manufacturing cost, the process for making its directional profile need to be simplified.
Invention content
It is an object of the present invention to being directed to drawbacks described above existing for existing high boron alloy, one kind is provided and has both been allowed to height
The wear-resisting phase of the master of volume fraction and large-size, and make the wear-resisting phase of the master that there is higher toughness and the high boron built-up welding in directional profile
Flux-cored wire.
The above-mentioned purpose of the present invention is realized by the following technical solutions：
The high boron flux-cored wire, it is and various in being equipped in the foreskin using H08A cold rollings thin steel strip as outer layer foreskin
Powdery components constitute powder core, through self-shield open arc built-up welding, formed a kind of wear-resisting phase of master by two boronation siderochrome manganese of kernel/(Fe, Cr,
Mn)223 siderochrome manganese molybdenum/(Fe, Cr, Mn, Mo) of B phases and its external six carbon boronation23(C,B)6Coat phase composition and in orientation
The hardfacing alloy of distribution；
The weight percentage of each powdery components of powder core is respectively：33~37% chrome content is 68~72%, contains
High carbon ferro-chrome/FeCr70C8.0 that carbon amounts is 8%；Ferro-boron/FeB18 that 43~47% boron content is 18%；4~6% carbon
Change boron/B4C；Molybdenum-iron/FeMo50-A that 3~5% amount containing molybdenum is 50%；3~5% manganese content is 78~85%, phosphorus content
For 1.5% mid-carbon fe-mn/FeMn80C1.5；2.5~3.5% phosphorus content is not less than 98% crystalline flake graphite/C；2~4%
Silicon content be 40~47% ferrosilicon/FeSi45；Surplus is reduced iron powder/Fe that iron-holder is not less than 98%；
The filling rate of the flux-cored wire powder core is 48~52%.
Further, in the flux-cored wire powder core, the high carbon ferro-chrome, ferro-boron, boron carbide, molybdenum-iron, mid-carbon fe-mn, scale stone
Ink, ferrosilicon, reduced iron powder fineness be 60 mesh.
The second object of the present invention is to provide the application process of above-mentioned high boron flux-cored wire, i.e.,：The high boron built-up welding
When flux-cored wire self-shield open arc built-up welding, arc voltage is 28~32V, and current control value is 300~320A, and speed of welding is
11~13mm/min.
One kind of the invention is by (Fe, Cr, Mn)2B phases and (Fe, Cr, Mn, Mo)23(C,B)6The two-phase complex intensifying of phase composition
The high boron flux-cored wire of main wear-resisting phase, can be applied to parts build-up wear-resistant alloy-layer under abrasive wear operating mode, such as：It sandblasts
Steel pipe inner wall wear-resistant alloy layer.Compared with prior art, the present invention has following innovative point and advantageous effect：
(1) main wear-resisting phase is different：The wear-resisting phase of master of high boron hardfacing alloy is usually with (Fe, Cr)2B and (Fe, Cr)7(C,B)3
Based on, the wear-resisting phase of master of high boron flux-cored wire hardfacing alloy of the invention is by kernel (Fe, Cr, Mn)2B phases and its outside
(Fe,Cr,Mn,Mo)23(C,B)6Coat the two-phase complex intensifying phase of phase composition.
(2) hardness property of main wear-resisting phase is different：The kernel (Fe, Cr, Mn) of the wear-resisting phase of two-phase complex intensifying master2B phases
Microhardness ranging from 1400~1650HV0.1, external (Fe, Cr, Mn, Mo)23(C,B)6The microhardness value of surrounding phase is ranging from
900~1250HV0.1；Its interior nuclear phase microhardness is high, and phase toughness is low；External surrounding phase boron content is low, and microhardness is compared with kernel
Mutually reduce, but the phase toughness improves, that is, formed in hard outer tough compound phase, can be allowed to bear higher plus load impact without
Chipping, the wear-resisting phase of the master has higher toughness.
(3) volume fraction of main wear-resisting phase is different：The volume fraction of the wear-resisting phase of this flux-cored wire hardfacing alloy master is up to
85% or more, (Fe, Cr) far above general high boron hardfacing alloy as main wear-resisting phase2B and (Fe, Cr)7(C,B)315~
40% or so volume fraction.
(4) form of main wear-resisting phase is different：With the quadrangle (Fe, Cr) of general high boron hardfacing alloy2B and hexagon
(Fe,Cr)7(C,B)3The wear-resisting phase of master in blocky or strip form and interlaced growing state it is different, the high boron of the present invention
The wear-resisting phase of master of hardfacing alloy is by the kernel (Fe, Cr, Mn) in lath-shaped2B phases and in long born of the same parents' shape outside (Fe, Cr, Mn,
Mo)23(C,B)6It coats phase composition and is in directional profile, avoid because of lath-shaped (Fe, Cr)2The wear-resisting intersection paraplasia of the single master such as B
Appearance long and that micro-flaw phenomenon is generated at contact surface.
(5) hardfacing alloy macrohardness is different：The macrohardness of this flux-cored wire hardfacing alloy is 65~66HRC,
Higher than general high chromium or high 55~62HRC of boron alloy or so macrohardness value, and its wearability is substantially better than hypoeutectic structure
The hardfacing alloy of high boron flux-cored wire and commercially available rich chromium cast iron flux-cored wire.
(6) cost performance is different：This flux-cored wire is only with high carbon ferro-chrome, ferro-boron, boron carbide and a small amount of molybdenum-iron, silicon
The components such as the ferroalloys such as iron, ferromanganese are used cooperatively, just obtain volume fraction be up to 85% or more two-phase complex intensifying master it is resistance to
Phase is ground, wearability is high and the cost of material is low, and overall cost performance is excellent.
Description of the drawings
Fig. 1 is the tissue morphology figure of the high boron flux-cored wire hardfacing alloy of the present invention.
Fig. 2 is the phase composition figure of high boron flux-cored wire hardfacing alloy shown in Fig. 1.
Fig. 3 is the tissue morphology figure for making high boron flux-cored wire hardfacing alloy in comparative example 2 by oneself.
Fig. 4 is the phase composition figure of the high boron flux-cored wire hardfacing alloy of self-control shown in Fig. 3.
Fig. 5 is the wear morphology figure of high boron flux-cored wire hardfacing alloy shown in Fig. 1.
Fig. 6 is the wear morphology figure of the high boron flux-cored wire hardfacing alloy of self-control shown in Fig. 3.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.
The a diameter of Φ 3.2mm of high boron flux-cored wire of the present invention, are made of medicine core and external portion two parts,
In, external portion selects H08A cold rolling thin steel strips；Medicine core is then made of following types of powders material：33~37% chrome content is
68~72%, high carbon ferro-chrome/FeCr70C8.0 that phosphorus content is 8%；Ferro-boron/FeB18 that 43~47% boron content is 18%；
4~6% boron carbide/B4C；Molybdenum-iron/FeMo50-A that 3~5% amount containing molybdenum is 50%；3~5% manganese content be 78~
85%, mid-carbon fe-mn/FeMn80C1.5 that phosphorus content is 1.5%；2.5~3.5% phosphorus content is not less than 98% scale stone
Ink/C；Ferrosilicon/FeSi45 that 2~4% silicon content is 40~47%；Surplus be iron-holder not less than 98% reduced iron powder/
Fe；The filling rate of the flux-cored wire powder core is 48~52%.
Before flux-cored wire molding, all powder component is first crossed into 60 mesh sieve, is then mixed together, and stir evenly.
The crin that then roll forming is Φ 4.4mm on flux-cored wire forming machine by the mixed-powder and H08A cold rolling thin steel strips, with
Each tube reducing 0.2mm, the welding wire that Φ 3.2mm are gradually drawn to by sintered carbide wire drawing die are spare.
With the self-shield open arc built-up welding on Q235A steel plates by the flux-cored wire of the Φ 3.2mm of MZ-1000 welding machines, the is formed
One layer of weld seam, process parameter control range：Arc voltage is 28~32V, and current control value is 300~320A, speed of welding
For 11~13mm/min.Wait for that weld seam is air-cooled to 100~150 DEG C hereinafter, ibid parameter, the flux-cored wire self-shield open arc built-up welding,
The second layer is formed, postwelding is air-cooled.
So far, applicant proposes the two-phase complex intensifying mode of the main wear-resisting phase of the present invention：High carbon chromium is added in flux-cored wire
The main function of iron, mid-carbon fe-mn and molybdenum-iron first consists in using strong boride formation element Cr, Mn element in therein, makes
(Fe,Cr,Mn)2Balance is in the absorption speed of growth of boron atom and the diffusion velocity of melt boron atom when B phase forming cores are grown
State, and the phase Precipitation Temperature is improved, thus (Fe, Cr, Mn)2The B direction of heat flow that hands down is grown to lath-shaped；Next, with
(Fe,Cr,Mn)2The precipitation of B and constantly growth, using eject from come carbon atom and remainder melt carbon, boron atom, together with
The metallic atoms such as Fe, Cr, Mn, Mo set up the multi-element alloyed carbon boron atom cluster of liquid, with (Fe, Cr, Mn, Mo) together23(C,
B)6The form of phase coats (Fe, Cr, Mn)2B phases are precipitated；Then, bigger than Fe, Cr and C atomic radius respectively using Mo, Mn and B
Feature causes (Fe, Cr, Mn, Mo)23(C,B)6Phase distortion of lattice is larger and more fault occurs, and remaining atom is in the fault
Step quickly adheres to and grows up, this makes this, and mutually growth is enough to big within the shorter period, at (Fe, Cr, Mn)2B phases
Outside forms good clad.The complex intensifying mode is by the high M of microhardness2Type B boride and the preferable M of phase toughness23
(C,B)6Type carbon boride organically combines, and forms the wear-resisting phase of master of two-phase complex intensifying.
Moreover, self-shield open arc hardfacing alloy is formed by (Fe, Cr, Mn)2B phases and (Fe, Cr, Mn, Mo)23
(C,B)6The multi-element alloyed mode of Fe, Cr, Mn tri- and Fe, Cr, Mn, Mo tri- or more constituent element is mutually respectively adopted and increases this
Phase toughness.
In addition, arc voltage is set as 28~32V, current control value is 300~320A, speed of welding is set as 11~
13mm/min.Wherein, arc voltage numerical value is corresponding with arc length, and arc length raising, which can be reduced, is heated to base material surface
Degree；Electric current reduce can reduce base material surface by temperature, accelerate molten bath cooling, the diffusion mobility of alloying element made to be limited in local
In range, to conducive to the hard outer tough wear-resisting phase of two-phase complex intensifying master in formation；Speed of welding, i.e. welding tractor walking speed
Degree, limit its speed, the temperature difference of (welding direction) before and after built-up welding melt can be effectively reduced, promote molten bath sink flows tend to perpendicular to
Facing surface, this makes the nascent hard phase as the wear-resisting phase of master be grown along sink flows direction, to be in directional profile.
Based on this, which is in the wear-resisting phase of master of directional profile and two-phase complex intensifying
Design principle can be summarized as：It distributes flux-cored wire component rationally, utilizes strong boride formation element Cr, Mn in being added, make
(Fe,Cr,Mn)2B phases are preferentially precipitated from melt and fully grow；Moreover, also utilize Mo, Mn and B respectively than Fe, Cr and C
The big feature of atom, is allowed at (Fe, Cr, Mn, Mo)23(C,B)6Phase forming core grow when form more fault, be follow-up Fe, Cr,
B, the quick apposition growth of the phase composition atom such as C provides forming core step, to be allowed to fast growth under the conditions of air-cooled；This is formed
By kernel (Fe, Cr, Mn)2B phases and its outside (Fe, Cr, Mn, Mo)23(C,B)6Coat the two-phase complex intensifying of phase composition
Main wear-resisting phase.Meanwhile it using the Collaborative Control of arc voltage, welding current and speed of welding, being formed and tending to be vertical with weld pool surface
Straight sink flows make the wear-resisting sink flows direction growth of handing down of the master of the two-phase complex intensifying, are finally allowed to be in directional profile.
Embodiment 1
By the powder core composition and ratio requirement of designed flux-cored wire when making, high carbon ferro-chrome, ferro-boron, boron carbide, molybdenum are weighed
The medicine cores component such as iron, ferromanganese, crystalline flake graphite, ferrosilicon and reduced iron powder.The powder core of the flux-cored wire forms (weight percent)：
High carbon ferro-chrome 35%, ferro-boron 45%, boron carbide 5%, molybdenum-iron 3%, ferromanganese 4%, crystalline flake graphite 3%, ferrosilicon 3%, reduced iron powder
2%, the flux-cored wire powder core filling rate is 52%.The flux-cored wire outer layer foreskin uses H08A cold-rolled strips (width 16mm
× thickness 0.36mm, the same below), and constitute powder in being equipped with ferroalloy, boron carbide, crystalline flake graphite and reduced iron powder etc. in foreskin
Core.
All medicine core powdery components cross 60 mesh sieve, and then medicine core all powder component is put together, is sufficiently stirred and makes
Uniform mixing.By above-mentioned mixed-powder and H08A cold-rolled strips, in YHZ-1 flux-cored wire forming machines, uniformly rolling is Φ 4.4mm
Flux-cored wire, with each tube reducing 0.2mm, then drawing tube reducing is 3.2 mm welding wires of Φ successively.
It is first that iron rust on the test plate (panel) of 120mm × 80mm × 16mm (Q235A steel) etc. is clean with grinder buffing, by above-mentioned Φ
The welding machine MZ-1000 self-shield open arc weldings of 3.2mm flux-cored wires form first layer weld seam；Wait for that weld seam is cooled to 100~150 DEG C
Hereinafter, by the flux-cored wire self-shield open arc built-up welding, second layer weld seam is formed, room temperature is air-cooled to.
The defects of self-shield open arc bead-welding technology parameter of flux-cored wire is as shown in table 1, postwelding weld seam pore-free, it is only micro-
Measure residue.Bead weld specimen linear cutter is prepared as 57mm × 25.5mm × 6mm wearability samples, is used in combination HR-150 Rockwells hard
Degree measurement tries its surface macrohardness.
Abrasion test uses the wheeled abrasion tester of MLS-225 type damp sand rubber, experimental condition 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 formally
Drying is cleaned after 1000 turns of experiment, weigh M1, the absolute weight loss Δ M=M of sample abrasion0-M1。
1 flux-cored wire self-shield open arc bead-welding technology parameter of table
It is made by oneself described in following bead weld specimen and comparative example 2 in face of commercially available rich chromium cast iron flux-cored wire described in ratio 1 respectively
For the bead weld specimen of high boron submerged-arc overlaying welding flux-cored wire as standard sample, the relative wear coefficient of standard sample is 1.00, other
The absolute absolute weight loss of weight loss/sample of relative wear coefficient ε=standard sample of alloy sample, test result are shown in Table 2.
The tissue morphology on the lateral vertical cross-section surface layer of flux-cored wire hardfacing alloy sample described in the present embodiment 1 and the built-up welding
The phase composition figure difference of alloy sample is as shown in Figure 1 and Figure 2, and the wear morphology of the hardfacing alloy sample is as shown in Fig. 5.
Embodiment 2
By the powder core composition and ratio requirement of designed flux-cored wire when making, high carbon ferro-chrome, ferro-boron, boron carbide, molybdenum are weighed
The medicine cores component such as iron, ferromanganese, crystalline flake graphite, ferrosilicon and reduced iron powder.The flux-cored wire powder core forms (weight percent)：It is high
Carbon ferrochrome 33%, ferro-boron 47%, boron carbide 4%, molybdenum-iron 5%, ferromanganese 3%, crystalline flake graphite 3.5%, ferrosilicon 2%, reduced iron powder
2.5%, the flux-cored wire powder core filling rate is 49%.The flux-cored wire outer layer foreskin uses H08A cold-rolled strips, and in packet
Intradermal ferroalloy, boron carbide, crystalline flake graphite and reduced iron powder etc. of being equipped with constitutes powder core.
All above-mentioned medicine core powdery components cross 60 mesh sieve, and then medicine core all powder component is put together, is sufficiently stirred
And it is allowed to uniformly mix.By above-mentioned mixed-powder and H08A cold-rolled strips, in YHZ-1 flux-cored wire forming machines, uniformly rolling is Φ
4.4mm flux-cored wires, with each tube reducing 0.2mm, then drawing tube reducing is Φ 3.2mm welding wires successively.
Other contents of the test are the same as embodiment 1.
Embodiment 3
By the powder core composition and ratio requirement of designed flux-cored wire when making, high carbon ferro-chrome, ferro-boron, boron carbide, molybdenum are weighed
The medicine cores component such as iron, ferromanganese, crystalline flake graphite, ferrosilicon and reduced iron powder.The powder core forms (weight percent)：High carbon ferro-chrome
36%, ferro-boron 43%, boron carbide 6%, molybdenum-iron 3%, ferromanganese 5%, crystalline flake graphite 2.5%, ferrosilicon 4%, reduced iron powder 0.5%,
The flux-cored wire powder core filling rate is 50%.The flux-cored wire outer layer foreskin uses H08A cold-rolled strips, and in matching in foreskin
Powder core is constituted with ferroalloy, boron carbide, crystalline flake graphite and reduced iron powder etc..
All medicine core powdery components cross 60 mesh sieve, and then medicine core all powder component is put together, is sufficiently stirred and makes
Uniform mixing.By above-mentioned mixed-powder and H08A cold-rolled strips, in YHZ-1 flux-cored wire forming machines, uniformly rolling is Φ 4.4mm
Flux-cored wire, with each tube reducing 0.2mm, then drawing tube reducing is 3.2 mm welding wires of Φ successively.
Other contents of the test are the same as embodiment 1.
Comparative example 1
Using commercially available rich chromium cast iron flux-cored wire (Φ 3.2mm) 120mm × 80mm × 16mm test plate (panel) (Q235A
Steel) on, with two layers of welding machine MZ-1000 self-shield open arcs built-up welding, electric current 400A, other technological parameters are the same as table 1.Built-up welding rear surface is residual
There are a small amount of slags, and the transversal crack at the intervals 12~16mm occur.
Other contents of the test are the same as embodiment 1.
Comparative example 2
Using high boron flux-cored wire is made by oneself, medicine core group becomes：High carbon ferro-chrome 30%, ferro-boron 30%, ferrotianium 20%, squama
Piece graphite 2%, reduced iron powder 18%, the powder core filling rate are 48%.Other content is the same as embodiment 1.
The flux-cored wire is on the test plate (panel) (Q235A steel) of 120mm × 80mm × 16mm, with welding machine MZ-1000 submerged arc overlay weldings
Two layers, SJ260, other bead-welding technology parameters are air-cooled with table 1.There is twice transversal crack on postwelding, bead-on-plate weld surface.
Other contents of the test are the same as embodiment 1.
Textura epidermoidea's form of the lateral vertical cross-section of flux-cored wire open arc hardfacing alloy described in comparative example 2 and the heap soldering
Respectively as shown in attached drawing 3 and attached drawing 4, the wear morphology of the hardfacing alloy sample is as shown in Fig. 6 for the phase composition of golden sample.
From table 2 it can be seen that the relative wear coefficient ε of the high boron flux-cored wire hardfacing alloy of the present invention is commercially available high chromium casting
4.81~6.24 times of iron flux-cored wire hardfacing alloy, and be the high boron flux-cored wire hardfacing alloy for making macrohardness 65HRC by oneself
11.26~14.62 times, this illustrate the high boron flux-cored wire have excellent wearability.
The Abrasive Resistance of Stubble-cleaning of 2 embodiment hardfacing alloy of table
By attached drawing 1 and attached drawing 2 it is found that the tissue of the high boron flux-cored wire self-shield open arc hardfacing alloy of the present invention mainly by
Lath-shaped (Fe, Cr, Mn)2Nuclear phase and its outer layer (Fe, Cr, Mn, Mo) in B23(C,B)6Coat the two-phase complex intensifying of phase composition
Phase (leading wear-resisting phase), a small amount of (Fe, Cr)3(C, B) mutually coordinates with α-Fe.Attached drawing 1 shows the sample two-phase complex intensifying phase
Volume fraction reaches 85% or more, and is in apparent directional profile feature.Make to lead wear-resisting phase by technological parameter Collaborative Control
In directional profile, this makes directional process method greatly simplify, and it is unaffected to weld operation.The alignment features of main wear-resisting phase make heat
Strain stress can pass through (Fe, Cr, Mn, the Mo) of its contained complicated face-centred cubic structure23(C,B)6The part plastic deformation of phase is given
To eliminate, thus on attached drawing 1 and have not seen lath-shaped (Fe, Cr, Mn)2There is micro-flaw in B phases, and merely with lath-shaped
(Fe,Cr)2Often there is micro-flaw in B phases, the hypereutectic high boron alloy especially to intermesh.This illustrates that the two-phase is compound strong
Changing main wear-resisting phase has higher toughness.
Comparative example 2 is in addition to ferrotianium content is higher than the high boron flux-cored wire of the present invention, ferro-boron content and general high boron flux-cored wire
It is close, but the components such as molybdenum-iron, ferrosilicon, ferromanganese and boron carbide are not added.By attached drawing 3 and attached drawing 4 it is found that homemade high boron medicine core
Welding wire built-up welding alloy belongs to typical hypoeutectic structure structure, organizes by martensite in born of the same parents' columnar ferrite, cellular crystal and along born of the same parents
(α-the Fe+ (Fe, Cr) that shape partial crystallization goes out23(C,B)6) or (α-Fe+ (Fe, Cr)3(C, B)) chrysanthemum shape eutectic composition, the eutectic
In continuous net-shaped dense distribution, resistance height is inserted into diamond penetrator, thus its macrohardness reaches 65HRC.
The wear morphology of bead weld specimen shown in attached drawing 5 and attached drawing 6 is compared it is found that under the conditions of identical wear test, this hair
Bright high boron flux cored wire wear surface residual peels off hole and a small amount of shallower cut, becomes without the plasticity of the micro- cutting of abrasive grain
Shape trace, wear mechanism are mainly the micro- peeling of abrasive grain, and it is strong that this illustrates that it resists the micro- cutting power of abrasive grain.And it compares
The high boron flux cored wire wear surface of macrohardness 65HRC shown in example 2 then remains apparent ditch dug with a plow, ditch dug with a plow both sides be also shown compared with
To be significantly plastically deformed trace, wear mechanism is the micro- cutting of abrasive grain, this illustrates that it resists the micro- cutting power of abrasive grain
It is relatively low.
The above result shows that the high boron flux-cored wire of self-shield open arc built-up welding of the invention possesses excellent resistance to abrasive grain mill
Performance is damaged, parts self-shield open arc build-up wear-resistant alloy-layer under abrasive wear operating mode is can be used for.
Claims (3)
1. a kind of high boron flux-cored wire, it is characterised in that：It is using H08A cold rollings thin steel strip as outer layer foreskin, and in the foreskin
It is inside equipped with various powdery components and constitutes powder cores, through self-shield open arc built-up welding, form a kind of wear-resisting phase of master by two boronation siderochrome of kernel
Manganese/(Fe, Cr, Mn)223 siderochrome manganese molybdenum/(Fe, Cr, Mn, Mo) of B phases and its external six carbon boronation23(C,B)6Surrounding phase group
At and in directional profile hardfacing alloy；
The weight percentage of each powdery components of powder core is respectively：33~37% chrome content is 68~72%, phosphorus content is
8% high carbon ferro-chrome/FeCr70C8.0；Ferro-boron/FeB18 that 43~47% boron content is 18%；4~6% boron carbide/B4C；3
Molybdenum-iron/FeMo50-A that~5% amount containing molybdenum is 50%；The medium carbon manganese that 3~5% manganese content is 78~85%, phosphorus content is 1.5%
Iron/FeMn80C1.5；2.5~3.5% phosphorus content is not less than 98% crystalline flake graphite/C；2~4% silicon content is 40~47%
Ferrosilicon/FeSi45；Surplus is reduced iron powder/Fe that iron-holder is not less than 98%；
The filling rate of the flux-cored wire powder core is 48~52%.
2. a kind of high boron flux-cored wire according to claim 1, it is characterised in that：It is described in the flux-cored wire powder core
High carbon ferro-chrome, ferro-boron, boron carbide, molybdenum-iron, mid-carbon fe-mn, crystalline flake graphite, ferrosilicon, reduced iron powder fineness be 60 mesh.
3. a kind of application process of high boron flux-cored wire as described in claim 1, it is characterised in that：The flux-cored wire self-insurance
When protecting open arc built-up welding, 28~32V of arc voltage, current control value is 300~320A, 11~13mm/min of speed of welding.
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| CN112404787A (en) * | 2020-11-13 | 2021-02-26 | 湘潭大学 | High-boron surfacing flux-cored wire with double main wear-resistant phases and application method thereof |
| CN113042928A (en) * | 2021-04-22 | 2021-06-29 | 西安理工大学 | Preparation method of low-alloy steel pipe |
| CN116690128A (en) * | 2023-08-09 | 2023-09-05 | 成都先进金属材料产业技术研究院股份有限公司 | Low-alloy high-strength steel-high-temperature alloy bimetal composite pipe and preparation method thereof |
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| CN116690128B (en) * | 2023-08-09 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Low-alloy high-strength steel-high-temperature alloy bimetal composite pipe and preparation method thereof |
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