CN104525573B - Roll and preparation method thereof - Google Patents
Roll and preparation method thereof Download PDFInfo
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- CN104525573B CN104525573B CN201410659405.6A CN201410659405A CN104525573B CN 104525573 B CN104525573 B CN 104525573B CN 201410659405 A CN201410659405 A CN 201410659405A CN 104525573 B CN104525573 B CN 104525573B
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Abstract
The present invention provides a kind of roll, and its body surface has a kind of carbide coating, and provides a kind of preparation method for obtaining above-mentioned roll.The carbide coating, including quasi- monocrystalline V2C dense ceramic layers, can also further include a micron V8C7Dense ceramic layers and V8C7With the fused layer of matrix.The quasi- monocrystalline V2C dense ceramic layers, micron V8C7Dense ceramic layers and V8C7With the fused layer of matrix successively distribution gradient.It is metallurgical binding between carbide coating and matrix, adhesion is very strong, overcomes non-metallurgical binding between existing hard particles and metallic matrix, and adhesion is very weak, granule holds caducous problem, and the anti-wear performance of roll working surface is greatly improved.
Description
Technical field
The present invention relates to a kind of composite roll with wear-resistant coating and preparation method thereof, more particularly to it is a kind of with wear-resisting
A kind of composite roll of carbide coating and preparation method thereof, and in particular to wear resistant carbide coating for being applied to alloy steel surface
Composite roll and preparation method thereof.
Background technology
In Ferrous Metallurgy equipment, roller work roll cooling widely, and is changed frequently, consumption is big.Due to roll work
Make that condition is very harsh, need long-time to bear the impact of the factors such as rolled-section high temperature, thermal shock and high-speed friction abrasion, institute
With with traditional material (as rich chromium cast iron, spheroidal graphite cast-iron, low-alloy steel, high-speed steel, heat resisting steel, Hardmetal materials and built-up welding it is multiple
Condensation material etc.) made by roll Jing often because the reasons such as abrasion, steel bonding fail.
Though rich chromium cast iron hardness is high, anti-wear performance is good, as material fragility causes greatly fracture, and machinability
Difference；The wearability and thermal shock resistance of spheroidal graphite cast-iron is poor, it is impossible to meets use requirement and is eliminated；Although resurfacing welding material
Service life can be improved, but surfacing equipment is expensive, once, its life-span increases little for built-up welding；High-alloy steel can occur at high temperature
Annealing phenomena, and as material itself does not have high hard phase, so anti-wear performance declines to a great extent；High alloy powder metallurgy liquid phase
Sintering method is existing at home and abroad to be reported in a large number, but studies still immature, and composite prepared by the method, its alloying component exist
Be difficult to be evenly distributed in matrix, poor controllability, and due to the addition of surfactant so that occur a large amount of pores in material structure
Etc. defect.
At present, the roll used in structural steel production, the material for mainly using is Cr12MoV steel alloys, be result in a large amount of
The waste of alloy material, the roll of structural steel production, its technical property requirements mainly have：
1st, high abrasion, roller surface wear extent and local damage it is the smaller the better, it is ensured that milling material high precision size tolerance；
2nd, thermal fatigue resistance is good, it is to avoid produce the generation and extension of fatigue crack；
3rd, high mechanical performance, it is desirable to which roll has high comprcssive strength and tensile strength；
4th, high tenacity, it is to avoid roll occurs brittle fracture.
But the hardness for only improving roller substrate material is still not sufficient to ensure that its persistency being on active service, therefore in its work
It is to solve the economical and effective means of the problem to make position and increase coating.The more painting for carbide material is used at this stage
Layer, which has the characteristics of hardness is high, abrasion resistance properties are superior, and being covered in alloy base surface with coating way can improve
The wearability of the parts prepared by matrix material and life-span.Wherein VCpIt is a kind of common coating material, which has following features
Characteristic：
(1) possess that density is low, intensity is high, elastic modelling quantity is high, antioxidation, the excellent physical chemistry such as wear-resisting, corrosion-resistant
Energy；
(2) growing up in sintering process, tendency is little, and granule is typically rounded, is a kind of ideal reinforcing material；
(3) vanadium resource enriches, and is readily available, less expensive, and vanadium carbide is obtained in metal-base composites generally
Using；
(4) face-centred cubic structure with very high heat stability and high rigidity, lattice paprmeter and lattice types and Ovshinsky
Closely, this is easy to preferably be combined with steel substrate body；
(5)VCpStandard enthalpy of formation △ G0Value is low, and its synthetic reaction is easy to carry out；
(6)VCpThe steel-based composite material of coating is except hardness is high, wearability well in addition to, machinable, forging, welding,
Heat treatment reinforcement and deform little, and the cold and hot working performance with common steel-smelting.Therefore, VCpCoating material is by widely
As chipless cold/hot metal machining tool, cutting tool, various moulds, antiwear heat resisting is anti-corrosion part wearing face.
The method for preparing carbide coating at present has chemical vapour deposition technique, physical vaporous deposition, heat spraying method, heat
, there is production equipment and require harshness, low production efficiency, the low deficiency of anchoring strength of coating in plating method etc., but these methods.
Therefore how VC is obtained in roll working surfacepCoating, and select that a kind of production equipment is simple, technological process is short
Preparation method, it is urgently to be resolved hurrily with the coating that basal body binding force is good, difficult for drop-off and mechanical property, anti-wear performance are excellent to obtain
Problem.
The content of the invention
The defect existed for above-mentioned prior art and deficiency, it is an object of the invention to provide a kind of composite roll, its
Body surface has a kind of wear-resistant coating, and roller core is still alloy steel matrix, and the wear-resistant coating is V2C dense ceramic layers, its change
Learn stability and wearability is good, with low-friction coefficient, high rigidity, low-surface-energy and low thermal conductiv-ity；And further, carry
For a kind of preparation method for obtaining above-mentioned composite roll.
Further, the present invention also provides a kind of composite roll, and its body surface has a kind of gradient composite coating, and which is excellent
Choosing is coated on body of roll matrix surface, to improve the wearability and fracture toughness on its surface, particularly alloy steel surface, and carries
For a kind of preparation method for obtaining above-mentioned coating.
The roll, including the body of roll, three part of roll neck and roller head.There is wear-resistant coating in its body of roll working surface wherein.
Preferably, concrete barrel diameter is 500-13000mm, and barrel length is 1000-4000mm.The selection of the length favorably ensures roller
The surface of body working position has very high hardness and good wearability, and body of roll part has good toughness.
To realize the object of the invention, following technical scheme is present invention employs：
A kind of body surface has the roll of wear-resistant coating, and the wear-resistant coating is V2C dense ceramic layers；Preferably, V2C is caused
Close ceramic layer is defined monocrystalline phase, and the quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase, compared to many crystalline phases, crystal orientation
Concordance is high, crystal boundary is significantly reduced, and the more orderly microscopic structure of atomic arrangement.
It is highly preferred that along V2C dense ceramic layers longitudinal profiles, its thickness be 9-23 μm, preferably 12-22 μm, more preferably
For 15-20 μm；Preferably, wherein V2The volume fraction of C is more than 80%, preferably greater than 90%；Preferably, V2C crystallite dimensions are
20-50 μm, preferably 30-50 μm.
Additionally, the present invention also provides the roll that a kind of body surface has gradient composite coating, the gradient composite coating
For carbide coating, including the V of distribution gradient successively2C dense ceramic layers, micron V8C7Dense ceramic layers, V8C7With matrix
Fused layer.
Preferably, V2C dense ceramic layers are defined monocrystalline phase, and the quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase
Between, compared to many crystalline phases, uniform orientation is high, crystal boundary is significantly reduced, and the more orderly microscopic structure of atomic arrangement.
It is highly preferred that along V2C dense ceramic layers longitudinal profiles, its thickness be 9-23 μm, preferably 12-22 μm, more preferably
For 15-20 μm；Preferably, wherein V2The volume fraction of C is more than 80%, preferably greater than 90%；Preferably, V2C crystallite dimensions are
20-50 μm, preferably 30-50 μm.
It is further preferred that along micron V8C7Dense ceramic layers longitudinal profile, its thickness are 17-88 μm, preferably 40-88 μ
M, more preferably 70-88 μm；Preferably, V8C7Volume fraction be more than 70%, preferably greater than 75%；Preferably, V8C7Crystal grain
Size is 5-15 μm, preferably 6-15 μm, more preferably 8-15 μm.
It is further preferred that along V8C7With the fused layer longitudinal profile of matrix, its thickness is 124 μm -1069 μm, preferably
For 300-1069 μm；Preferably, wherein V8C7Volume fraction be 20%-85%, preferably 50%-85%；Preferably, V8C7
Crystallite dimension be 5-20 μm, preferably 10-20 μm.
Preferably, gradient composite coating gross thickness is 150-1180 μm, preferably at 400-1180 μm.
It is highly preferred that roller substrate tissue can be divided into pearlite, martensite, ferrite, shellfish according to heat treatment mode difference
One or more in family name's body, austenite and sorbite；Preferably, the gradient composite coating is applied in alloy steel surface.
The present invention provides the preparation method that a kind of body surface has the roll of wear-resistant coating, comprises the steps：
1) first prepare a vanadium plate, it is preferred that wherein the purity of vanadium should be controlled in 99.7-99.9%；It is highly preferred that the vanadium
The THICKNESS CONTROL of plate is in 0.2-3mm；Preferably, the vanadium plate is first surface-treated；
2) the work force-bearing situation according to roll, the position of its key wear is body surface, solid in pipe die inwall accordingly
Then vanadium plate in step 1 is wound so as to combined closely with outer carbon source by fixed outer carbon source according to pipe die inner wall size；It is excellent
Selection of land, fixes outer carbon source in the Austenitic stainless steel pipe mould inwall of centrifuge；
3) alloy steel substrate is smelted for molten steel；Preferably, temperature control is at 1500-1560 DEG C；
4) by above-mentioned molten steel be cast to it is above-mentioned be placed with the centrifuge pipe die of vanadium plate and carbon source, after molten metal cooling after pull out
Go out, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller core is still alloy steel matrix；
Preferably, above-mentioned molten steel is cast to into above-mentioned being placed with the centrifuge pipe die of vanadium plate and carbon source by centrifugal casting；Preferably,
Cast temperature is controlled at 1500-1560 DEG C, and casting time was advisable for the 60-120 seconds；It is highly preferred that centrifuge speed is 500-
600rpm；Preferably, extract after molten metal cooling 2-3min；
5) the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly and is incubated, finally
Cool to room temperature with the furnace, so that wear-resistant coating is formed in body surface, and roller core matrix is still alloy steel matrix；
Wherein, wear-resistant coating is V2C dense ceramic layers.
Preferably, by rate-determining steps 5) in temperature retention time, holding temperature obtain the V2C dense ceramic layers；Preferably, V2C
Dense ceramic layers are defined monocrystalline phase, and the quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase, compared to many crystalline phases, brilliant
Significantly reduce to concordance height, crystal boundary, and the more orderly microscopic structure of atomic arrangement.
The present invention also provides the preparation method that a kind of body surface has the roll of gradient composite coating, including following step
Suddenly：
1) first prepare a vanadium plate, it is preferred that wherein the purity of vanadium should be controlled in 99.7-99.9%；It is highly preferred that the vanadium
The THICKNESS CONTROL of plate is in 0.2-3mm；Preferably, the vanadium plate is first surface-treated；
2) the work force-bearing situation according to roll, the position of its key wear is body surface, solid in pipe die inwall accordingly
Fixed outer carbon source, then by step 1) in vanadium plate be wound according to pipe die inner wall size so as to combine closely with outer carbon source；It is excellent
Selection of land, fixes outer carbon source in the Austenitic stainless steel pipe mould inwall of centrifuge；
3) alloy steel substrate is smelted for molten steel；Preferably, temperature control is at 1500-1560 DEG C；
4) by above-mentioned molten steel be cast to it is above-mentioned be placed with the centrifuge pipe die of vanadium plate and carbon source, after molten metal cooling after pull out
Go out, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller core is still alloy steel matrix；
Preferably, above-mentioned molten steel is cast to into above-mentioned being placed with the centrifuge pipe die of vanadium plate and carbon source by centrifugal casting；Preferably,
Cast temperature is controlled at 1500-1560 DEG C, and casting time was advisable for the 60-120 seconds；It is highly preferred that centrifuge speed is 500-
600rpm；Preferably, extract after molten metal cooling 2-3min；
5) the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly and is incubated, finally
Cool to room temperature with the furnace, so that gradient composite coating is formed in body surface, and roller core matrix is still alloy steel matrix；
6) body surface obtained by has the roll of gradient composite coating by further heat treatment to obtain more suitably base
Body is organized.
Preferably, vanadium plate thickness is 0.2～3mm, if being less than 0.2mm, vanadium plate is just complete in cast recombination process
Full response, it is impossible to obtain V2C is organized, and directly generates Dispersed precipitate V8C7；Diffusion length is then caused to increase more than 3mm, reaction power
It is not enough.
Preferably, by strict rate-determining steps 5) in holding temperature and time relation, obtain quasi- monocrystalline phase V2C is caused
Close ceramic layer.The ceramic layer presents more obvious quasi- single crystal organization, and crystal boundary reduction is shown as under optical microscope, affects disconnected
The dislocation for splitting toughness is also accordingly reduced, and instead of sub boundary increases, and effectively improves the anti-crack ability of the ceramic layer.
Preferably, by rate-determining steps 5) in temperature retention time, holding temperature obtain the gradient composite coating i.e. carbide and apply
Layer, the carbide coating include quasi- monocrystalline phase V of distribution gradient successively2C dense ceramic layers, micron V8C7Dense ceramic layers,
V8C7With the fused layer of matrix.
It is highly preferred that above-mentioned steps 5) in holding temperature, temperature retention time and the gradient composite coating being finally obtained in that
Gross thickness meet equation below,
L=kTlogt1/2+b0
Wherein：
The gross thickness (μm) of L --- gradient composite coating,
K --- it is constant, value is 0-1, k ≠ 0,
T --- holding temperature (K),
T --- temperature retention time (s),
b0--- the thickness of the composite bed formed between vanadium plate after the cast of original depth (μm), i.e. molten steel.
To sum up, the gradient composite coating, including V2C dense ceramic layers, hardness are high.The V2C dense ceramic layers are defined list
Crystalline phase, the quasi- monocrystalline mutually refer to that arrangement monocrystalline unlike of atom has identical lattice like that, but still with strict
Sequentially, present geometry arrangement；Uniform orientation is high, crystal boundary is significantly reduced, and atomic arrangement is more orderly.Quasi- monocrystalline is mutually situated between
Between many crystalline phases and monocrystalline phase, compared to many crystalline phases, the crystal boundary of quasi- monocrystalline phase is significantly reduced, and dislocation density is low, has more Asia
Crystal boundary, therefore hardness is obviously improved；And than monocrystalline phase, which is lower to preparation method requirement, and organize more stable.
Preferably, in step 1) in, it is as follows the step of surface treatment：
First step pickling, from the phosphoric acid or the hydrogen peroxide of 120ml/L of the hydrochloric acid or 60ml/L of 300ml/L, rear flowing water punching
Wash；
Second step pickling, from the sulphuric acid or the hydrogen peroxide of 240ml/L of the Fluohydric acid. or 200ml/L of 300ml/L, rear flowing water
Rinse；
3rd step surface is polished, from 800-1200 mesh Al2O3Sand paper, is finally cleaned by ultrasonic with ethanol.
It is highly preferred that step 2) in outer carbon source be graphite paper or graphite powder；Preferably, the graphite paper be three-level with
On, purity is 85-99%, and thickness is 0.1-0.35mm；Preferably, the graphite powder selects granularity in 600-1000 mesh, purity
For 85-99%.It should be noted that when pipe die inwall fixes graphite paper, pipe die is without preheating；And work as pipe die inwall and fix
During graphite powder, need to adopt spraying process, i.e., with compressed air or other power will suspend graphite powder is driven to nozzle, with vaporific
Form is sprayed on the rotation pipe die inwall for being preheated to l50～250 DEG C, is dried graphite bisque using pipe die heat, can obtain thickness
Uniform graphite bisque.
Preferably, step 5) in, 1000-1160 DEG C is warming up to, programming rate is controlled in 7 DEG C/min, and temperature retention time is
6.5-11.5h, preferred 8-10h.
Preferably, selected alloy steel matrix be low-alloy high-tensile structural steel, alloy tool steel, high-speed steel, mould steel or
Heat resisting steel.
Preferably, shielding gas is argon or nitrogen, and gas flow is 4-7ml/min.
Wherein, holding temperature should be strict controlled in above range, and temperature is higher than 1160 DEG C, the liquid phase mistake in course of reaction
It is many, and cause V2C is transformed into V8C7, and quasi- monocrystalline phase V can not be obtained2C；But temperature is less than 1000 DEG C, then the dissolubility of V
It is too low, reaction cannot forward direction carry out.Likewise, temperature retention time should also keep one it is rational interval, the time more than 11.5h,
Almost all of V2C can be changed into V8C7, and be less than 6.5h, then react the V of acquisition2Very little, coating layer thickness is difficult to ensure that C, most preferably
Should be maintained at 8-10h.
It is highly preferred that the roll complex with carbide coating by further heat treatment obtaining more suitably matrix group
Knit：High alloy cast steel roll is heated to into Ac3Above 150-250 DEG C held for some time；Spheroidizing heat treatment, selects nodularization
Temperature, generally greater than or slightly above Ac1Critical point；Quenching heat treatment, is heated to critical temperature (AcmOr Ac1) more than, insulation
After certain hour is allowed to abundant austenitizing, then with the cooling rate quick refrigeration more than critical cooling rate to bainite transformation area,
So that body surface working lining obtains bainite structure.
Based on steel alloy, selected alloy steel matrix is low-alloy high-tensile structural steel to the roll, preferably
Q345A, Q345B, Q345C, Q345D, Q345E, Q420A, Q460A etc. (see GB GB/T 1951-2008), alloy tool steel,
Including high-speed steel and mould steel, such as W18Cr4V, W6Mo5Cr4V2, W9Mo3Cr4V, 9CrWMo, 9Cr, 9Cr2,9CrV,
8Cr2MoV, 9Cr2Mo, 9Cr2MoV, 9Cr3Mo, 8Cr3MoV, 8Cr5MoV, 55Mn2,55Cr, 60CrMnMo, 60SiMnMo etc.,
See GB GB/T 1299-2000, or heat resisting steel, preferably ZG40GCr9Si2, ZG30Cr18Mn12Si2N,
ZG35Cr24Ni7SiN etc. (see GB YB/T 036.3-92), matrix are not all pearlite, horse according to heat treatment mode
One or more in family name's body, ferrite, bainite, austenite and sorbite.
The present invention introduces outer carbon after casting especially the roll complex of centrifugal casting acquisition alloy steel matrix+vanadium
Source, directly can form carbide coating, carbide coating and roller core matrix in the body surface of roll in the way of heating diffusion
Between be metallurgical binding, adhesion is very strong, overcomes non-metallurgical binding between existing hard particles and metallic matrix, and adhesion is very
Weak, granule holds caducous problem, and the mechanical property of coating is greatly improved.And the method is simple to operate, without the need for complicated
Equipment, the roller performance of acquisition are good.Different heat treatment modes, makes roll have different mechanical properties, meets reality
The requirement of production.Due to the formation of the quasi- single-crystal ceramic layer of surface compact, the ceramic layer presents more obvious quasi- single crystal organization,
Crystal boundary reduction is shown as under optical microscope, affects the dislocation of fracture toughness also accordingly to reduce, instead of sub boundary increases, and effectively carries
The anti-crack ability of the high ceramic layer.Therefore body surface has higher hardness HRC50-72, and relative wear resistance is the 10- of matrix
20 times.The definition of the relative wear resistance is：With matrix material as standard specimen, in identical abrasive grain, same load, disk
Rotated after same number of turns with same rotational speed, tested coating produces wear extent and is referred to as coating with the ratio of standard specimen generation wear extent
Relative wear resistance, therefore the relative wear resistance of also referred to as coating is several times of matrix, the examination criteria of following identical parameters
It is same.
This is due to V therein2C dense ceramic layers are defined single crystal organization, and chemical stability and wearability are good, rub with low
Wipe coefficient, high rigidity, low-surface-energy and low thermal conductiv-ity.And micron V on the other side8C7The hardness of dense ceramic layers can only reach
To HRC40-50, its relative wear resistance is 6-10 times of matrix.
Description of the drawings
Fig. 1 is outer carbon source (graphite paper or graphite powder) and layout drawing of the vanadium plate in pipe die before spun casting；
Fig. 2 is the partial enlarged drawing that composite roll and sample after heat treatment are intercepted.
Specific embodiment
Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.7%, the vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, from the hydrochloric acid of 300ml/L, rear flowing water is rinsed；
Second step pickling, from the Fluohydric acid. of 300ml/L, rear flowing water is rinsed；
3rd step surface is polished, from the Al of 800 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Control is in 0.2mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly in Austria of centrifuge
The outer carbon source 3 of fixation in family name's body rustless steel pipe die 2, outer carbon source 3 are graphite paper, and the graphite paper is for more than three-level, purity 85% is thick
Spend for 0.1mm, then the vanadium plate 1 in step 1 be wound according to 2 inner wall size of pipe die so as to combine closely with graphite paper,
As shown in Figure 1.
3rd, it is molten steel to smelt alloy steel substrate, and at 1500 DEG C, selected alloy steel matrix is Q345A to temperature control.
4th, by above-mentioned molten steel by centrifugal casting be cast to it is above-mentioned be placed with the centrifuge pipe die 2 of vanadium plate 1 and graphite paper,
Without preheating, at 1500 DEG C, casting time is 60 seconds to pipe die, and centrifuge speed is 500rpm, treats metal for cast temperature control
Extract after liquid cooling 2-3min, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller core
4 is still Q345A matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1000 DEG C, programming rate is controlled in 7 DEG C/min handling process parameter, and temperature retention time is 6.5h, last furnace cooling
To room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still Q345A matrixes.The shielding gas is argon,
Gas flow is 5ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 700 DEG C or so, matrix is pearlitic structrure.
Gained gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 20 μm；Along coating
Longitudinal profile, its thickness are 9 μm, wherein V2The volume fraction of C is 90%.
Further, also include positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6,
Along coating longitudinal profile, its thickness is 17 μm, V8C7Volume fraction be 75%, its crystallite dimension be 5 μm.
Further, also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Dense ceramic layers 6 it
Under V8C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 124 μm, wherein V8C7Volume fraction be 20%,
Its crystallite dimension is 5 μm.Now, the carbide coating is composite coating, as shown in Fig. 2 by the quasi- monocrystalline V2The fine and close potteries of C
Enamel coating 5, micron V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is
150μm.The roller substrate is pearlite.Body surface has higher hardness HRC50, and relative wear resistance is the 10 of matrix
Times.
Embodiment 2：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.8%.The vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, the phosphoric acid of 60ml/L, rear flowing water are rinsed；
Second step pickling, the sulphuric acid of 200ml/L, rear flowing water are rinsed；
3rd step surface is polished, from the Al of 1000 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Degree control is in 1mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly in Austria of centrifuge
The outer carbon source 3 of fixation in family name's body rustless steel pipe die 2, outer carbon source 3 are graphite paper, and the graphite paper is more than three-level, and purity is 99%,
Thickness is 0.2mm, then the vanadium plate 1 in step 1 is wound according to 2 inner wall size of pipe die so as to closely tie with graphite paper
Close.
3rd, it is molten steel to smelt alloy steel substrate, and at 1510 DEG C, selected alloy steel matrix is W6Mo5Cr4V2 to temperature control.
4th, by above-mentioned molten steel by centrifugal casting be cast to it is above-mentioned be placed with the centrifuge pipe die 2 of vanadium plate 1 and graphite paper,
Without preheating, cast temperature is controlled at 1510 DEG C pipe die, and casting time was advisable for 70 seconds, and centrifuge speed is 550rpm, is treated
Extract after molten metal cooling 3min, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller
Core 4 is still W6Mo5Cr4V2 matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1050 DEG C, programming rate is controlled in 7 DEG C/min handling process parameter, and temperature retention time is 7.5h, last furnace cooling
To room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still W6Mo5Cr4V2 steel matrix.The shielding gas
For argon, gas flow is 6ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 500 DEG C, matrix is bainite structure.
The gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 22 μm；Along coating
Longitudinal profile, its thickness are 12 μm；Wherein V2The volume fraction of C is 80%.
Further, also include positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6,
Along coating longitudinal profile, its thickness is 52 μm, V8C7Volume fraction be 78%, its crystallite dimension be 7 μm.
Further, also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Dense ceramic layers 6 it
Under V8C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 396 μm, wherein V8C7Volume fraction be 60%,
Its crystallite dimension is 15 μm.Now, the carbide coating is composite coating, by the quasi- monocrystalline V2It is C dense ceramic layers 5, micro-
Rice V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is 460 μm.Institute
Roller substrate is stated for bainite.Body surface has higher hardness HRC60, and relative wear resistance is 14 times of matrix.
Embodiment 3：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.8%.The vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, the hydrogen peroxide of 120ml/L, rear flowing water are rinsed；
Second step pickling, the hydrogen peroxide of 240ml/L, rear flowing water are rinsed；
3rd step surface is polished, from the Al of 1200 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Degree control is in 2mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly in Austria of centrifuge
The outer carbon source 3 of fixation in family name's body rustless steel pipe die 2, outer carbon source 3 are graphite paper, and the graphite paper is for more than three-level, purity 95% is thick
Spend for 0.35mm, then the vanadium plate in step 1 is wound according to 2 inner wall size of pipe die so as to combine closely with graphite paper.
3rd, alloy steel substrate is smelted for molten steel, at 1520 DEG C, selected alloy steel matrix is temperature control
ZG40GCr9Si2。
4th, by above-mentioned molten steel by centrifugal casting be cast to it is above-mentioned be placed with the centrifuge pipe die 2 of vanadium plate 1 and graphite paper,
Without preheating, cast temperature is controlled at 1520 DEG C pipe die, and casting time was advisable for 80 seconds, and centrifuge speed is 550rpm, is treated
Extract after molten metal cooling 3min, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller
Core 4 is still ZG40GCr9Si2 matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1080 DEG C, programming rate is controlled in 7 DEG C/min handling process parameter, and temperature retention time is 9.5h, last furnace cooling
To room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still ZG40GCr9Si2 matrixes.The shielding gas is
Nitrogen, gas flow are 7ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 220 DEG C, matrix is martensitic structure.
The gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 25 μm；Along coating
Longitudinal profile, its thickness are 14 μm；Wherein V2The volume fraction of C is 95%.
Further, including positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6, edge
Coating longitudinal profile, its thickness are 57 μm, V8C7Volume fraction be 80%, its crystallite dimension be 10 μm.
Further, can also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Ceramic of compact
V under layer 68C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 669 μm, wherein V8C7Volume fraction be
75%, its crystallite dimension is 15 μm.Now, the carbide coating is composite coating, by the quasi- monocrystalline V2C dense ceramic layers
5th, micron V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is 740 μ
m.The roller substrate is martensite.Body surface have higher hardness HRC68,18 times of relative wear resistance matrix.
Embodiment 4：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.9%.The vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, from the phosphoric acid of 60ml/L, rear flowing water is rinsed；
Second step pickling, the sulphuric acid of 200ml/L, rear flowing water are rinsed；
3rd step surface is polished, from the Al of 1200 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Degree control is in 3mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly initially with spraying
Outer carbon source 3 is sprayed on method 2 inwall of rotation Austenitic stainless steel pipe mould for being preheated to l50 DEG C, and outer carbon source 3 is graphite powder, is utilized
The heat of pipe die 2 is dried graphite powder, can obtain graphite bisque in uniform thickness.The graphite powder selects granularity in 600 mesh, purity
For 85%.Then the vanadium plate 1 in step 1 is wound according to 2 inner wall size of pipe die so as to combine closely with graphite bisque.
3rd, it is molten steel to smelt alloy steel substrate, and at 1530 DEG C, selected alloy steel matrix is Q420A to temperature control.
4th, above-mentioned molten steel is cast to into the above-mentioned centrifuge pipe die 2 for being placed with vanadium plate 1 and graphite bisque by centrifugal casting
Interior, without preheating, cast temperature is controlled at 1530 DEG C pipe die 2, and casting time was advisable for 90 seconds, and centrifuge speed is
600rpm, extracts after molten metal cooling 3min, obtains the composite roll of as cast condition, and its body surface is answering for steel alloy and vanadium plate
Zoarium, and roller core 4 is still Q420A matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1160 DEG C, programming rate is controlled in 7 DEG C/min handling process parameter, and temperature retention time is 11.5h, last furnace cooling
To room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still Q420A matrixes.The shielding gas is nitrogen,
Gas flow is 5ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 220 DEG C, matrix is martensitic structure.
The gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 50 μm, along coating
Longitudinal profile, its thickness are 23 μm, wherein V2The volume fraction of C is 95%.
Further, also include positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6,
Along coating longitudinal profile, its thickness is 88 μm, V8C7Volume fraction be 80%, its crystallite dimension be 15 μm.
Further, also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Dense ceramic layers 6 it
Under V8C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 1069 μm, wherein V8C7Volume fraction be
55%, its crystallite dimension is 20 μm.Now, the carbide coating is composite coating, by the quasi- monocrystalline V2C dense ceramic layers
5th, micron V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is 1180
μm.The roller substrate is martensite.Body surface has higher hardness HRC72, and relative wear resistance is 20 times of matrix.
Embodiment 5：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.7%.The vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, from the hydrochloric acid of 300ml/L, rear flowing water is rinsed；
Second step pickling, the hydrogen peroxide of 240ml/L, rear flowing water are rinsed；
3rd step surface is polished, from the Al of 800 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Control is in 0.2mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly initially with spraying
Outer carbon source 3 is sprayed on method 2 inwall of rotation Austenitic stainless steel pipe mould for being preheated to 200 DEG C, and outer carbon source 3 is graphite powder, is utilized
Pipe die heat is dried outer carbon source 3, can obtain graphite bisque in uniform thickness.The graphite powder selects granularity in 800 mesh, and purity is
89%.Then the vanadium plate 1 in step 1 is wound according to 2 inner wall size of pipe die so as to combine closely with graphite powder.
3rd, it is molten steel to smelt alloy steel substrate, and at 1540 DEG C, selected alloy steel matrix is 9CrWMo to temperature control.
4th, above-mentioned molten steel is cast to into the above-mentioned centrifuge pipe die 2 for being placed with vanadium plate 1 and graphite bisque by centrifugal casting
Interior, without preheating, cast temperature is controlled at 1540 DEG C pipe die 2, and casting time was advisable for 100 seconds, and centrifuge speed is
500rpm, extracts after molten metal cooling 2min, obtains the composite roll of as cast condition, and its body surface is answering for steel alloy and vanadium plate
Zoarium, and roller core 4 is still 9CrWMo matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1150 DEG C, programming rate is controlled in 5-9 DEG C/min handling process parameter, and temperature retention time is 8.5h, finally cold with stove
But to room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still 9CrWMo matrixes.The shielding gas is nitrogen
Gas, gas flow are 6ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 750 DEG C or so, matrix is pearlitic structrure.
The gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 42 μm；Along coating
Longitudinal profile, its thickness are 22 μm；Wherein V2The volume fraction of C is 80%.
Further, also include positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6,
Along coating longitudinal profile, its thickness is 77 μm, V8C7Volume fraction be 78%, its crystallite dimension be 14 μm.
Further, also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Dense ceramic layers 6 it
Under V8C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 1001 μm, wherein V8C7Volume fraction be
60%, its crystallite dimension is 15 μm.Now, the carbide coating is composite coating, by the quasi- monocrystalline V2C dense ceramic layers
5th, micron V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is 1100
μm.The roller substrate is pearlite.Body surface has higher hardness HRC55, and relative wear resistance is 12 times of matrix.
Embodiment 6：The preparation method of roll, comprises the steps：
1st, first prepare a vanadium plate 1, the wherein purity of vanadium should be controlled 99.9%.The vanadium plate 1 should first by surface in addition
Process, step is as follows：
First step pickling, from the hydrogen peroxide of 120ml/L, rear flowing water is rinsed；
Second step pickling, the hydrogen peroxide of 240ml/L, rear flowing water are rinsed；
3rd step surface is polished, from the Al of 1200 mesh2O3Sand paper, is finally cleaned by ultrasonic with ethanol.The thickness of the vanadium plate 1
Degree control is in 1.5mm.
2nd, the work force-bearing situation according to roll, the position of its key wear is body surface, accordingly initially with spraying
Outer carbon source 3 is sprayed on method 2 inwall of rotation Austenitic stainless steel pipe mould for being preheated to 250 DEG C, and outer carbon source 3 is graphite powder, is utilized
2 heat of pipe die is dried graphite powder, can obtain graphite bisque in uniform thickness.The graphite powder selects granularity in 1000 mesh, purity
For 99%.Then the vanadium plate 1 in step 1 is wound according to 2 inner wall size of pipe die so as to combine closely with graphite bisque.
3rd, alloy steel substrate is smelted for molten steel, at 1560 DEG C, selected alloy steel matrix is temperature control
ZG30Cr18Mn12Si2N。
4th, above-mentioned molten steel is cast to into the above-mentioned centrifuge pipe die 2 for being placed with vanadium plate 1 and graphite bisque by centrifugal casting
Interior, without preheating, cast temperature is controlled at 1560 DEG C pipe die 2, and casting time was advisable for 120 seconds, and centrifuge speed is
580rpm, extracts after molten metal cooling 3min, obtains the composite roll of as cast condition, and its body surface is answering for steel alloy and vanadium plate
Zoarium, and roller core 4 is still ZG30Cr18Mn12Si2N matrixes.
5th, the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly carries out heat treatment, heat
To be warming up to 1100 DEG C, programming rate is controlled in 5-9 DEG C/min handling process parameter, and temperature retention time is 10.5h, finally cold with stove
But to room temperature, so as to form gradient composite coating in body surface, and roller core 4 is still ZG30Cr18Mn12Si2N matrixes.It is described
Shielding gas is nitrogen, and gas flow is 8ml/min.
6th, the body surface of gained has the composite roll of gradient composite coating, more suitable to obtain by further heat treatment
Matrix, heat treatment step is：Heat treatment is carried out at 300 DEG C or so, matrix is bainite structure.
The gradient composite coating includes V2C dense ceramic layers 5, be defined monocrystalline phase, and its crystallite dimension is 36 μm；Along coating
Longitudinal profile, its thickness are 20 μm；Wherein V2The volume fraction of C is 95%.
Further, also include positioned at above-mentioned quasi- monocrystalline V2Micron V under C dense ceramic layers 58C7Dense ceramic layers 6,
Along coating longitudinal profile, its thickness is 72 μm, V8C7Volume fraction be 90%, its crystallite dimension be 12 μm.
Further, also include positioned at above-mentioned quasi- monocrystalline V2C dense ceramic layers 5 and micron V8C7Dense ceramic layers 6 it
Under V8C7With the fused layer 7 of matrix, along coating longitudinal profile, its thickness is 988 μm, wherein V8C7Volume fraction be 85%,
Its crystallite dimension is 15 μm.Now, the carbide coating is composite coating, by the quasi- monocrystalline V2It is C dense ceramic layers 5, micro-
Rice V8C7Dense ceramic layers 6 and V8C7Constitute with the fused layer 7 of matrix, and distribution gradient successively, its gross thickness is 1080 μm.
The roller substrate is bainite.Body surface has higher hardness HRC65, and relative wear resistance is 16 times of matrix.
Comparative example 1, its preparation method is as follows：With laser cladding directly by V8C7Work of the vanadium carbide granule cladding in roll
Making face, coating layer thickness being obtained for 30 μm, volume fraction is 80%, the hardness of gained coating is HRC45, and relative wear resistance is matrix
3.62 times.
In comparative example, Laser Surface Modification Technology production cost is high, and low production efficiency, technological parameter are wayward, and uses
During will cause pore and slag inclusion using bonding agent；And in fused layer, there is not quasi- monocrystalline V2C dense ceramic layers and micron V8C7
Dense ceramic layers, fused layer thickness and V8C7Content is less, V8C7Crystallite dimension is larger；Meanwhile, recombination process is only to additional
The intergranular gap of hard vanadium carbide carries out casting and blends additional granule is carried out melting, sintered, hard vanadium carbide granule and metal
Non- metallurgical binding between matrix, adhesion are very weak, and granule easily comes off or exist oxidation, Inclusion Problem, therefore, its mechanical property compared with
Difference.
Claims (17)
1. a kind of roll, has wear-resistant coating in its body surface, it is characterised in that：The wear-resistant coating is V2C ceramic of compact
Layer；V2C dense ceramic layers are defined monocrystalline phase, and the quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase, compared to polycrystalline
Phase, uniform orientation is high, crystal boundary is significantly reduced, and the more orderly microscopic structure of atomic arrangement；
Along V2C dense ceramic layers longitudinal profiles, its thickness are 9-23 μm；Wherein V2The volume fraction of C is more than 80%；V2C crystal grain chis
It is very little for 20-50 μm.
2. a kind of roll, has gradient composite coating in its body surface, it is characterised in that：The gradient composite coating is carbonization
Thing coating, including the V of distribution gradient successively2C dense ceramic layers, micron V8C7Dense ceramic layers, V8C7With the fused layer of matrix；
V2C dense ceramic layers are defined monocrystalline phase, and the quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase, compared to many crystalline phases,
Uniform orientation is high, crystal boundary is significantly reduced, and the more orderly microscopic structure of atomic arrangement；
Along V2C dense ceramic layers longitudinal profiles, its thickness are 9-23 μm；Wherein V2The volume fraction of C is more than 80%；V2C crystal grain chis
It is very little for 20-50 μm.
3. roll as claimed in claim 2, it is characterised in that：Along micron V8C7Dense ceramic layers longitudinal profile, its thickness is
17-88μm；V8C7Volume fraction be more than 70%；V8C7Crystallite dimension be 5-15 μm.
4. roll as claimed in claim 3, it is characterised in that：Along V8C7With the fused layer longitudinal profile of matrix, its thickness is
124μm-1069μm；Wherein V8C7Volume fraction be 20%-85%；V8C7Crystallite dimension be 5-20 μm.
5. roll as claimed in claim 4, it is characterised in that：Gradient composite coating gross thickness is 150-1180 μm.
6. the roll as described in one of claim 4-5, it is characterised in that：Matrix according to heat treatment be not all pearlite,
One or more in martensite, ferrite, bainite, austenite and sorbite；The gradient composite coating is applied in alloy
Steel surface.
7. a kind of preparation method of roll as claimed in claim 1, it is characterised in that body surface has wear-resistant coating, including
Following steps：
1) first prepare a vanadium plate, the wherein purity of vanadium should be controlled in 99.7-99.9%；The THICKNESS CONTROL of the vanadium plate is in 0.2-
3mm；The vanadium plate is first surface-treated；
2) the work force-bearing situation according to roll, the position of its key wear is body surface, fixes outer in pipe die inwall accordingly
Carbon source, then by step 1) in vanadium plate be wound according to pipe die inner wall size so as to combine closely with outer carbon source；In centrifugation
The Austenitic stainless steel pipe mould inwall of machine fixes outer carbon source；
3) alloy steel substrate is smelted for molten steel；Temperature control is at 1500-1560 DEG C；
4) by above-mentioned molten steel be cast to it is above-mentioned be placed with the centrifuge pipe die of vanadium plate and outer carbon source, after molten metal cooling after pull out
Go out, obtain the composite roll of as cast condition, its body surface is the complex of steel alloy and vanadium plate, and roller core is still alloy steel matrix；
At 1500-1560 DEG C, casting time is the 60-120 seconds for cast temperature control；Centrifuge speed is 500-600rpm；Treat molten metal
Extract after cooling 2-3min；
5) the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly and is incubated, finally with stove
Room temperature is cooled to, and so that wear-resistant coating is formed in body surface, and roller core matrix is still alloy steel matrix；
Wherein, wear-resistant coating is V2C dense ceramic layers.
8. the preparation method of roll as claimed in claim 7, it is characterised in that：V2C dense ceramic layers are defined monocrystalline phase, described
Quasi- monocrystalline is mutually referred to, between many crystalline phases and monocrystalline phase, compared to many crystalline phases, uniform orientation is high, crystal boundary is significantly reduced, and
And the more orderly microscopic structure of atomic arrangement；By rate-determining steps 5) in temperature retention time, holding temperature obtain the V2The fine and close potteries of C
Enamel coating.
9. a kind of preparation method of the roll as described in one of claim 2-5, it is characterised in that body surface has graded composite
Coating, comprises the steps：
1) first prepare a vanadium plate, the wherein purity of vanadium should be controlled in 99.7-99.9%；The THICKNESS CONTROL of the vanadium plate is in 0.2-
3mm；The vanadium plate is first surface-treated；
2) the work force-bearing situation according to roll, the position of its key wear is body surface, fixes outer in pipe die inwall accordingly
Carbon source, then by step 1) in vanadium plate be wound according to pipe die inner wall size so as to combine closely with outer carbon source；In centrifugation
The Austenitic stainless steel pipe mould inwall of machine fixes outer carbon source；
3) alloy steel substrate is smelted for molten steel；Temperature control is at 1500-1560 DEG C；
4) by above-mentioned molten steel be cast to it is above-mentioned be placed with the centrifuge pipe die of vanadium plate and carbon source, after molten metal cooling after extract,
The composite roll of as cast condition is obtained, its body surface is the complex of steel alloy and vanadium plate, and roller core is still alloy steel matrix；Casting
At 1500-1560 DEG C, casting time is the 60-120 seconds to temperature control；Centrifuge speed is 500-600rpm；Treat that molten metal is cooled down
Extract after 2-3min；
5) the as cast condition composite roll extracted is transferred in the heat-treatment furnace with protective atmosphere quickly and is incubated, finally with stove
Room temperature is cooled to, and so that gradient composite coating is formed in body surface, and roller core matrix is still alloy steel matrix；
6) body surface obtained by has the roll of gradient composite coating by further heat treatment to obtain matrix.
10. the preparation method of roll as claimed in claim 9, it is characterised in that：By rate-determining steps 5) in temperature retention time, protect
Temperature obtains the gradient composite coating i.e. carbide coating, and the carbide coating includes the quasi- monocrystalline of distribution gradient successively
Phase V2C dense ceramic layers, micron V8C7Dense ceramic layers, V8C7With the fused layer of matrix.
The preparation method of 11. rolls as claimed in claim 10, it is characterised in that：In step 5) in holding temperature, insulation when
Between and the gross thickness of gradient composite coating that is finally obtained in that meet equation below,
L=kTlogt1/2+b0
Wherein：
The gross thickness μm of L --- gradient composite coating,
K --- it is constant, value is 0-1, k ≠ 0,
T --- holding temperature K,
T --- temperature retention time s,
b0--- the thickness of the composite bed formed between vanadium plate after the cast of original depth μm, i.e. molten steel.
The preparation method of 12. rolls as described in one of claim 10-11, it is characterised in that：The step 1) in, at surface
The step of reason, is as follows：
First step pickling, from the phosphoric acid or the hydrogen peroxide of 120ml/L of the hydrochloric acid or 60ml/L of 300ml/L, rear flowing water is rinsed；
Second step pickling, from the sulphuric acid or the hydrogen peroxide of 240ml/L of the Fluohydric acid. or 200ml/L of 300ml/L, rear flowing water punching
Wash；
3rd step surface is polished, from 800-1200 mesh Al2O3Sand paper, is finally cleaned by ultrasonic with ethanol.
The preparation method of 13. rolls as claimed in claim 12, it is characterised in that：The step 2) in outer carbon source be graphite
Paper or graphite powder；The graphite paper is more than three-level, and purity is 85-99%, and thickness is 0.1-0.35mm；The graphite powder is selected
In 600-1000 mesh, purity is 85-99% to granularity.
The preparation method of 14. rolls as claimed in claim 13, it is characterised in that：The step 5) in, it is warming up to 1000-
1160 DEG C, programming rate is controlled in 7 DEG C/min, and temperature retention time is 6.5-11.5h.
The preparation method of 15. rolls as claimed in claim 14, it is characterised in that：Selected alloy steel matrix is low-alloy high-strength
Degree structural steel, alloy tool steel or heat resisting steel, described alloy tool steel include high-speed steel or mould steel.
The preparation method of 16. rolls as claimed in claim 15, it is characterised in that：The shielding gas is argon or nitrogen, gas
Body flow is 4-7ml/min.
The preparation method of 17. rolls as described in one of claim 14-16, it is characterised in that：The step 6) in heat at
Science and engineering sequence is：By step 5) process after roll be heated to Ac3Above 150-250 DEG C held for some time；At spheroidizing heat
Reason, selects nodularization temperature, higher than Ac1Critical point；Quenching heat treatment, is heated to critical temperature AcmOr Ac1More than, insulation one
Fix time after being allowed to abundant austenitizing, then with the cooling rate quick refrigeration more than critical cooling rate to bainite transformation area, from
And make body of roll matrix obtain bainite structure.
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| CN106363027B (en) * | 2016-08-19 | 2018-02-09 | 合肥东方节能科技股份有限公司 | A kind of how compound base molded flexible mill guide wheel and preparation method thereof |
| CN108188380B (en) * | 2017-12-28 | 2019-10-29 | 鞍钢矿山机械制造有限公司 | A kind of production method of steel copper composite balls |
| CN111136246B (en) * | 2019-12-27 | 2021-09-28 | 石家庄石特轧辊有限公司 | Preparation method of high-speed steel roller |
| CN115261569B (en) * | 2022-08-22 | 2023-10-31 | 大冶特殊钢有限公司 | 60Cr3 steel ball annealing method |
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| CN1172460A (en) * | 1995-08-30 | 1998-02-04 | 日铁表面硬化株式会社 | Roll for take-up equipment for hot rolling mill |
| CN101386029A (en) * | 2008-11-03 | 2009-03-18 | 西安建筑科技大学 | Composite roll mixed with reinforcement cast iron base and manufacture method thereof |
| CN101670426A (en) * | 2009-10-16 | 2010-03-17 | 西安建筑科技大学 | Method for preparing composite roll of strengthened ductile cast iron with in-situ cladding wearing layer |
| CN102847713A (en) * | 2012-09-20 | 2013-01-02 | 虞伯林 | Wearable hot roll |
| CN103014532A (en) * | 2013-01-16 | 2013-04-03 | 唐山亿联盛轧辊有限公司 | High-abrasion-resistance composite roller and preparation method thereof |
| CN203002756U (en) * | 2013-01-04 | 2013-06-19 | 江苏钢宝轧辊有限公司 | Composite metallurgical roller |
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| JP4771879B2 (en) * | 2006-07-18 | 2011-09-14 | 株式会社椿本チエイン | Silent chain for automobile engines |
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|---|---|---|---|---|
| CN1172460A (en) * | 1995-08-30 | 1998-02-04 | 日铁表面硬化株式会社 | Roll for take-up equipment for hot rolling mill |
| CN101386029A (en) * | 2008-11-03 | 2009-03-18 | 西安建筑科技大学 | Composite roll mixed with reinforcement cast iron base and manufacture method thereof |
| CN101670426A (en) * | 2009-10-16 | 2010-03-17 | 西安建筑科技大学 | Method for preparing composite roll of strengthened ductile cast iron with in-situ cladding wearing layer |
| CN102847713A (en) * | 2012-09-20 | 2013-01-02 | 虞伯林 | Wearable hot roll |
| CN203002756U (en) * | 2013-01-04 | 2013-06-19 | 江苏钢宝轧辊有限公司 | Composite metallurgical roller |
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