CN100389229C - Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece - Google Patents
Boron-Chromium-rare earth co-infiltration process combined with pre-infiltration cold deformation for workpiece Download PDFInfo
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- CN100389229C CN100389229C CNB2006100451872A CN200610045187A CN100389229C CN 100389229 C CN100389229 C CN 100389229C CN B2006100451872 A CNB2006100451872 A CN B2006100451872A CN 200610045187 A CN200610045187 A CN 200610045187A CN 100389229 C CN100389229 C CN 100389229C
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Abstract
The present invention relates to a boron-chromium-rare earth co-infiltration technique for the cold deformation of the pre-infiltration of a workpiece. Firstly, the workpiece is processed in a shot blasting mode, and prepared boron-chromium-rare earth co-infiltration agents are added to urea and ammonium chloride to be uniformly mixed; next, a mixture of the boron-chromium-rare earth co-infiltration agents, the urea and the ammonium chloride is put into an infiltration box; oil and rust on the surface of the workpiece processed in a shot blasting mode are removed, and the non-infiltration position of the workpiece is protected by graphite or an asbestos rope; the bottom layer and the top of the infiltration box are filled with co-infiltration agents; the workpiece is embedded in the infiltration box filled with powder or granular co-infiltration agents, and the distance between the workpiece and the box wall is larger than 30mm; after the infiltration box is sealed by double layers of water glass mud, the infiltration box is dried at 90 to 110 DEG C; the temperature rises from 840 to 860 DEG C, the workpiece is put in a heating furnace at the proper temperature, and the heat of the workpiece is kept for 3.8 to 4.2 hours in a timing mode at the proper temperature; next, the workpiece is taken from the furnace and is cooled in the air; finally, the workpiece is processed in a quench hardening mode or a low-temperature tempering mode. With the adoption of the technique, the tissue of an infiltration layer can be changed, the brittleness of the infiltration layer is reduced on the premise of not reducing the hardness of the infiltration layer, and the anti-abrasion performance of the infiltration layer is improved simultaneously.
Description
Technical field
The present invention relates to a kind of deformation chemical heat treatment process, the boron-chromium-RE co-permeating technology of cold deformation before specifically a kind of workpiece oozes.
Background technology
Boronising is a kind of novel thermal process technology that RECENT DEVELOPMENTS is got up, and refers generally to infiltrate in ferrous materials boron, to obtain the thermal treatment process of iron boride.Steel is through after the boronising, and the surface has very high hardness (can reach 1300～2100HV) and wear resistance, good corrosion stability, oxidation-resistance and thermohardening.This technology becomes the surface diffusion of widespread use gradually and infiltrates treatment process, in Petro-Chemical Machinery, and the automobile and tractor manufacturing, textile manufacturing machine, the application of aspects such as tool and mould day by day increases.Also very extensive, the nearly all ferrous materials of material that is fit to boronising can carry out boronising as structure iron, tool steel, stainless steel, graphitic cast iron, spheroidal graphite cast iron, Wimet etc. and handle.Gas boriding and ion boriding BCl because of adopting
3, B
2H
6Medium exists price height, severe toxicity, problem such as explosive, fails to be used for to produce.Liquid boriding is because used pot life is short, and the sticking salt of workpiece surface is problem such as easy to clean and the difficult control of quality not, and it is applied in to a certain extent and is restricted.Since the seventies in last century, people begin to pay attention to pack boriding.
The same with other thermo-chemical treatment, also there is significant disadvantages in boronising, and is slow and boride layer fragility is big as boronising speed.Because boronising is generally carried out more than the eutectoid temperature of ferrous materials, oozes postcooling and certainly will cause workpiece to undergo phase transition, make workpiece produce distortion.Like this, the obvious attenuation of boride layer that after machining, stays of workpiece.Though boride layer hardness is very high, fragility is bigger.Because the iron boron compound itself is hard crisp metallic compound, difference on the specific volume and the coefficient of expansion between the different in addition borides and between boride and the matrix, easily cause and bearing greater impact load or temperature when sharply changing, produce disadvantageous unrelieved stress, cause peeling off and ftractureing of deep layer.More than being the main drawback of boronising, also is that it uses limited major reason.
Present domestic boriding process is mainly used on abominable tool and mould of working conditions and the part easy to wear, and its main purpose is for wear resistance that improves component and work-ing life, reduces production costs, and increases economic efficiency.Mainly reach this purpose at present by two approach: the first, use original material to prolong its work-ing life by boronising.The second, substitute expensive material with cheap material by boronising.The boronising workpiece expands machine parts to by tool and mould, expand precision workpiece to by common workpiece, all obtained using widely in industries such as machinery, metallurgy, oil, chemical industry, light industry, colliery, agricultural machinery, but from a large amount of research, find, they are applied on the dimensional requirement very not strict tool and mould and consumable accessory mostly, and the application on precision part is fewer.Boronising and subsequent heat treatment thereof change greatly workpiece size, thereby have seriously limited the application of boronising on precision part, so also need novel process, novel method and the instrument of a large amount of research and development processing boronising parts.Have only two shortcomings that solved boronising preferably in a word, could enlarge the application of boronising more widely.
Along with novel pressure working method in producing constantly occurs, as moulding processs such as cold extrusion, roll extrusion, cold-drawn, shot-peening, superplastic deformations, the deformation thermo-chemical treatment is developed rapidly.It as quickening the thermo-chemical treatment dynamic process, improves the diffusion layer organization performance with its special advantage; Increase substantially the performances relevant such as steel-iron components resistance to wears, antifatigue with surface strengthening; Save energy reduces production costs etc., is progressively paid attention to by people.
Summary of the invention
The present invention is the deficiency that overcomes existing boronizing technology, and providing a kind of can increase depth of penetration and speed, suppresses the FeB growth, helps Fe
2B forms, and Fe
2The fine and closely woven straight length of B pin tooth, infiltration layer is thick, fragility is low, the penetration enhancer cost is low, the cold plastic deformation of workpiece before oozing and the confusion technology that boron-chromium-RE co-permeating combines.
The objective of the invention is to adopt following technical proposals to realize, boron-chromium-RE co-permeating the technology of cold deformation before a kind of workpiece oozes, earlier workpiece is carried out shot peening, add urea and ammonium chloride in the Powdered or granular boron-chromium-RE co-permeating agent that will prepare again, mix, pack into and ooze in the case, workpiece surface after the shot peening is through degreasing and rust removal, the non-position of oozing is protected with graphite or asbestos twine, ooze case bottom and top and fill diffusion medium, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 90-110 ℃ of oven dry; Be warming up to 840-860 ℃ again, go into process furnace to temperature, to temperature back timing insulation 3.8-4.2 hour, the air cooling of coming out of the stove was then quenched to workpiece at last and low-temperaturetempering is handled.
Described workpiece is carried out shot peening is to adopt Q3110A type shotblasting machine, and the shot-peening time is 50-70 minute, and it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 50-70m/s.
Described diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing, diffusion medium comprises industrial borax, high carbon ferro-chrome, rare earth and silicocalcium, its process for preparation is as follows:
A. high carbon ferro-chrome, rare earth, silicocalcium are ground into the 90-110 order;
B. borax is ground into 90-110 purpose powder after 400-500 ℃ of dehydration;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 140-160 ℃ of oven dry 2-3 hour; Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 90-110 ℃.
Deformation boron-chromium-RE co-permeating Analysis on Mechanism
Cold plastic deformation is to cocementation layer depth, hardness and brittle influence
Experiment shows, deformation boron-chromium-RE co-permeating has produced very big influence to co-penetration layer tissue and performance, boron tooth elongated flat, even compact; Depth of penetration obviously increases.The sample of shot-peening 1.5h is compared with the sample of flow not, and the infiltration rate degree can improve 28%～45% altogether; Simultaneously infiltration layer has also kept higher hardness (1300～1800HV) and lower fragility.A large amount of dislocations that deformation causes are for the diffusion of boron atom provides favourable " passage ".The boron atom when dislocation spreads needed intensity of activation less than the intensity of activation when the dot matrix internal diffusion; And at the near zone of dislocation, the jump frequency of atom is equally greater than dot matrix inside, and " passage " is easier spreads along these for the boron atom.The boride nucleus that enters the boron atom on sample top layer simultaneously or just formed will " pinning " around dislocation line, the recovery and the recrystallize of deformed microstructure played inhibition, its delay maybe can not be carried out, thereby has quickened the formation and the growth of infiltration layer.With the increase of dislocation desity, the free enthalpy in the system obviously increases, and absorption and the velocity of diffusion of boron atom in crystal can be accelerated.The reason that co-penetration layer fragility descends can be summed up as: the one, and dissolving in of Cr improved Fe
2The valence electron space key network situation pockety of B phase makes Fe
2The essential fragility of B phase is descended; The 2nd, deformation is oozed altogether and is beneficial to Fe
2The monophasic formation of B, thus the tiny crack that causes because of FeB reduced; The 3rd, transition layer thickens, and hardness gradient slows down.
Co-penetration layer tissue and composition
Compare with single boride layer, co-penetration layer maintains the tissue signature of single boride layer, but co-penetration layer is comparatively fine and close, and surface porosity is lighter, boron tooth elongated flat; Simultaneously, the zone of transition of co-penetration layer thickens, and zone of transition Medium pearlite content increases (45 steel), and the between cog tissue is few.Co-penetration layer structure observation after tripotassium reagent corrosion shows, co-penetration layer substantially by (Fe, Me)
2The single-phase composition of B (Me is chromium and rare earth element), auburn FeB is mutually few.The micro-area composition analysis is pointed out: chromium is basic in co-penetration layer to be uniform distribution, and rare earth is then many to be gathered partially at the crystal boundary place.The more reason of zone of transition content of pearlite in alloy is: because it is thick to ooze the infiltration layer of sample under the same treatment condition altogether, and carbon atom is insoluble in the boride, therefore in the infiltration layer forming process, the carbon atom on top layer is pushed to the position of boron tooth and matrix bond, forms carbon-rich zone in this zone.
Co-penetration layer forms
More rare earth element is contained than intragranular in co-penetration layer column crystal top, and this may be the cause that rare earth atom at first is adsorbed, specimen surface is infiltrated in the back.This be because: 1. the electronegativity of rare earth atom is low, is very easy to lose electronics, causes its activity to be higher than chromium, boron atom; 2. because the 5d and the 6s energy level of rare earth atom is very near, and under 850 ℃ of high temperature, the electronics of rare earth atom 6s track is easy to the transition of 5d track, causes atomic polarization and cause atomic radius to reduce; 3. rare earth atom has unique 4f electronic structure, and its 4f layer demonstrates bigger effective nuclear charge (particularly do not have the La of 4f electronic structure and 2 4f electronic structure Ce are only arranged) to the nuclear charge bad sealing.Therefore, can think that rare earth atom has stronger sucking action to electronics on every side, the result preferentially is adsorbed on workpiece surface or carries several active B atoms and a small amount of Cr atom is adsorbed.The short-range diffusion of rare earth atom (particularly the fault locations such as a large amount of dislocations that cause by deformation carry out) causes the matrix lattice distortion, and Fe atom vibrations on the aggravation dot matrix node promote the formation in new room in the crystal.Then, B and a small amount of Cr atom occupy this room, gathering, diffusion, form (Fe, Me)
2The B phase will make boride (Fe like this
2B) forming core quantity increases, and column crystal attenuates and diminishes, dense structure.
When surperficial co-penetration layer was linked to be sheet, the diffusion of rare earth atom was hindered, and major part penetrates into infiltration layer inside with crystal boundary.Infer that in the fact of hole place enrichment rare earth atom has been filled the room that forms owing to moving to the interior of iron and other atom, and the hole of infiltration layer is diminished by rare earth element.Chromium atom then passes through co-penetration layer according to substitute mode, arrives zone of transition.Boride has repulsive interaction to carbon atom, does not have enough carbon and chromium to form compound in the co-penetration layer, so chromium atom basic uniform distribution in co-penetration layer.Since Si, P, and impurity elements such as S are insoluble to co-penetration layer and are pushed to the crystal boundary place, there is very strong avidity rare earth element and they, and therefore, rare earth is in the process of infiltrating along crystal boundary, generate fusing point height, thermodynamically stable rare earth compound with the impurity reaction, alleviated the deleterious effect of impurity.
The invention has the beneficial effects as follows: adopt this technology, can improve diffusion layer organization, under the prerequisite that does not reduce nitrided layer hardness, reduced infiltration layer fragility, also improved the wear resistance of infiltration layer simultaneously.Boron-chromium-RE co-permeating can make infiltration layer crystal boundary electron distributions be tending towards homogenizing, alleviate harmful element low boron phase of poly-partially and easy acquisition on crystal boundary, and infiltration layer fragility is descended.Boron-chromium-RE co-permeating studies have shown that, adopts confusion technology can obtain the tissue of darker infiltration layer and densification, but and chromium element and rare earth element solid solution in Fe
2Among the B, transition layer thickens simultaneously, and hardness gradient slows down.Chromium is uniform distribution in co-penetration layer substantially, and rare earth is then many to be gathered partially at the crystal boundary place.
Description of drawings
Fig. 1 is the figure of tissue topography of 45 steel sample co-penetration layers under shot-peening 1.5h, the 850 ℃ * 4h;
Fig. 2 is the figure of tissue topography of 45 steel sample co-penetration layers under shot-peening 1h, the 850 ℃ * 4h;
Fig. 3 is the co-penetration layer hardness figure of 45 steel samples under 850 ℃ * 4h condition of plastic-less deformation, shot-peening 1h and shot-peening 1.5h;
Fig. 4 is the figure of tissue topography of the T8 steel sample co-penetration layer under shot-peening 1.5h, the 850 ℃ * 4h;
Fig. 5 is the figure of tissue topography of the T8 steel sample co-penetration layer under shot-peening 1h, the 850 ℃ * 4h;
Fig. 6 is T8 steel sample co-penetration layer hardness figure under 850 ℃ * 4h condition of plastic-less deformation, shot-peening 1h and shot-peening 1.5h.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Embodiment 1: No. 45 steel sample shot-peenings were carried out boron-chromium-RE co-permeating in 1.5 hours then under 850 ℃ * 4h condition, ooze the back sample is observed and detected.Its technological process is as follows:
1. workpiece is carried out shot peening
Adopt Q3110A type shotblasting machine, the shot-peening time is 90 minutes, and it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 70m/s.
2. diffusion medium preparation
Diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing, Powdered or make the particulate state diffusion medium and comprise industrial borax, high carbon ferro-chrome, rare earth and silicocalcium; Its process for preparation is as follows:
A. with high carbon ferro-chrome, rare earth, silicocalcium are ground into 100 orders;
B. borax is ground into 100 purpose powder after 500 ℃ of dehydrations;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 150 ℃ of oven dry 3 hours; Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 100 ℃.
3. vanning
In the good diffusion medium of oven dry, add urea and ammonium chloride, mix, pack into and ooze in the case.
4. boron-chromium-RE co-permeating
Workpiece surface after the shot peening is through degreasing and rust removal, and the non-position of oozing is oozed case bottom and top and filled diffusion medium with graphite or asbestos twine protection, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, and distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 100 ℃ of oven dry; Be warming up to 850 ℃ again, go into process furnace, to temperature back timing insulation 4 hours, the air cooling of coming out of the stove then to temperature.
5. ooze aftertreatment
Oozing the back quenches and the low-temperaturetempering processing to workpiece.
Embodiment 2: No. 45 steel sample shot-peenings were carried out boron-chromium-RE co-permeating in 1 hour then under 850 ℃ * 4h condition, its technological process is as follows:
1. workpiece is carried out shot peening
Adopt Q3110A type shotblasting machine, the shot-peening time is 60 minutes, and it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 50m/s;
2. diffusion medium preparation
Diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing, Powdered or make the particulate state diffusion medium and comprise industrial borax, high carbon ferro-chrome, rare earth and silicocalcium, its process for preparation is as follows:
A. with high carbon ferro-chrome, rare earth, silicocalcium are ground into 90 orders;
B. borax is ground into 90 purpose powder after 400 ℃ of dehydrations;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 140 ℃ of oven dry 2 hours; Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 90 ℃;
3. vanning
In the good diffusion medium of oven dry, add urea and ammonium chloride, mix, pack into and ooze in the case;
4. boron-chromium-RE co-permeating
Workpiece surface after the shot peening is through degreasing and rust removal, and the non-position of oozing is oozed case bottom and top and filled diffusion medium with graphite or asbestos twine protection, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, and distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 90 ℃ of oven dry; Be warming up to 850 ℃ again, go into process furnace, to temperature back timing insulation 3.8 hours, the air cooling of coming out of the stove then to temperature;
5. ooze aftertreatment
Oozing the back quenches and the low-temperaturetempering processing to workpiece.
As shown in Figure 1 and Figure 2, by the room temperature shot peening, the diffusion layer organization that obtains under 850 ℃ * 4h does not have the diffusion layer organization densification of flow, and boron tooth elongated flat and intermediary are mingled with less, ooze the back degree of depth and when shot-peening 1.5h and 1h, can reach 113um and 100um respectively, obviously quickened boronising speed.It can also be seen that from Fig. 1, Fig. 2: co-penetration layer is even, and surface porosity is lighter.45 steel are through shot peening, and because of the dislocation structure that deformation is introduced in steel can be explained the influence of infiltration layer formation and growth: increase with deflection, dislocation born of the same parents are elongated, and dislocation desity increases in the cell wall; Be not out of shape the sample ratio, the deformation specimen surface makes surface active because of containing a large amount of dislocations, thereby quickened the adsorption process of boronising initial stage surface to the boron atom, the boride small-particle that enters the boron atom on sample top layer or just separated out will play inhibition to the recovery or the recrystallize of deformed microstructure, its delay maybe can not be carried out, thereby quickened the formation and the growth of infiltration layer.As shown in Figure 3, after oozing altogether, nitrided layer hardness has raising than plastic-less deformation's situation end, thereby has kept higher hardness.
Embodiment 3: to T8 steel sample shot-peening 1.5 hours, carry out boron-chromium-RE co-permeating under 850 ℃ * 4h condition, ooze the back sample is observed and detected.Its technological process is as follows:
1. workpiece is carried out shot peening
Adopt Q3110A type shotblasting machine, the shot-peening time is 90 minutes, and it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 70m/s;
2. diffusion medium preparation
Diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing, Powdered or make the particulate state diffusion medium and comprise industrial borax, high carbon ferro-chrome, rare earth and silicocalcium; Its process for preparation is as follows:
A. with high carbon ferro-chrome, rare earth, silicocalcium are ground into 100 orders;
B. borax is ground into 100 purpose powder after 500 ℃ of dehydrations;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 150 ℃ of oven dry 3 hours; Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 100 ℃;
3. vanning
In the good diffusion medium of oven dry, add urea and ammonium chloride, mix, pack into and ooze in the case;
4. boron-chromium-RE co-permeating
Workpiece surface after the shot peening is through degreasing and rust removal, and the non-position of oozing is oozed case bottom and top and filled diffusion medium with graphite or asbestos twine protection, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, and distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 100 ℃ of oven dry; Be warming up to 850 ℃ again, go into process furnace, to temperature back timing insulation 4 hours, the air cooling of coming out of the stove then to temperature;
5. ooze aftertreatment
Oozing the back quenches and the low-temperaturetempering processing to workpiece.
Embodiment 4: to T8 steel sample shot-peening 1 hour, carry out boron-chromium-RE co-permeating under 850 ℃ * 4h condition, ooze the back sample is observed and detected.Its technological process is as follows:
1. workpiece is carried out shot peening
Adopt Q3110A type shotblasting machine, the shot-peening time is 60 minutes, and it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 50m/s.
2. diffusion medium preparation
Diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing.Powdered or make the particulate state diffusion medium and comprise industrial borax, high carbon ferro-chrome, rare earth and silicocalcium, its process for preparation is as follows:
A. with high carbon ferro-chrome, rare earth, silicocalcium are ground into 90 orders;
B. borax is ground into 90 purpose powder after 400-500 ℃ of dehydration;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 140 ℃ of oven dry 2 hours.Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 90 ℃;
3. vanning
In the good diffusion medium of oven dry, add urea and ammonium chloride, mix, pack into and ooze in the case;
4. boron-chromium-RE co-permeating
Workpiece surface after the shot peening is through degreasing and rust removal, and the non-position of oozing is oozed case bottom and top and filled diffusion medium with graphite or asbestos twine protection, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, and distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 90 ℃ of oven dry; Be warming up to 850 ℃ again, go into process furnace, to temperature back timing insulation 3.8 hours, the air cooling of coming out of the stove then to temperature.
5. ooze aftertreatment
Oozing the back quenches and the low-temperaturetempering processing to workpiece.
As Fig. 4, shown in Figure 5, after the room temperature shot peening, the diffusion layer organization that obtains under 850 ℃ * 4h does not have the diffusion layer organization of flow fine and close more, boron tooth elongated flat and intermediary are mingled with less, ooze the back degree of depth and when shot-peening 1.5h and 1h, can reach 73um and 60um respectively, obviously quickened boronising speed.It can also be seen that from Fig. 4, Fig. 5: co-penetration layer is even, and surface porosity is lighter.The T8 steel is through shot peening, because of the dislocation structure that deformation is introduced in steel can be explained the influence of infiltration layer formation and growth: increase with deflection, dislocation born of the same parents are elongated, dislocation desity increases in the cell wall, with be not out of shape the sample ratio, the deformation specimen surface makes surface active because of containing a large amount of dislocations, thereby quickened the adsorption process of boronising initial stage surface to the boron atom, the boride small-particle that enters the boron atom on sample top layer or just separated out will play inhibition to the recovery or the recrystallize of deformed microstructure, its delay maybe can not be carried out, thereby quickened the formation and the growth of boride layer.As shown in Figure 6, after oozing altogether, nitrided layer hardness is than roughly the same under plastic-less deformation's situation, thereby kept higher hardness.
Claims (3)
1. boron-chromium-RE co-permeating the technology of cold deformation before a workpiece oozes, it is characterized in that: earlier workpiece is carried out shot peening, add urea and ammonium chloride in the Powdered or granular boron-chromium-RE co-permeating agent that will prepare again, mix, pack into and ooze in the case, workpiece surface after the shot peening is through degreasing and rust removal, the non-position of oozing is protected with graphite or asbestos twine, ooze case bottom and top and fill diffusion medium, workpiece imbedded be filled with the oozing in the case of powder or granular diffusion medium, distance should be greater than 30mm between workpiece and tank wall; Ooze case with the sealing of double-deck water glass mud after, 90-110 ℃ of oven dry; Be warming up to 840-860 ℃ again, go into process furnace to temperature, to temperature back timing insulation 3.8-4.2 hour, the air cooling of coming out of the stove was then quenched to workpiece at last and low-temperaturetempering is handled.
2. boron-chromium-RE co-permeating the technology of cold deformation before workpiece according to claim 1 oozes, it is characterized in that: described workpiece is carried out shot peening is to adopt Q3110A type shotblasting machine, the shot-peening time is 50-70 minute, it is the cast steel ball of 1.4mm that shot adopts diameter, and the steel ball linear velocity is 50-70m/s.
3. boron-chromium-RE co-permeating the technology of cold deformation before workpiece according to claim 1 oozes, it is characterized in that: described diffusion medium is to pass through L
18(6
1* 3
6) L
8(4
1* 2
4) general choosing, Powdered boron-chromium-RE co-permeating agent of choosing, diffusion medium comprises industrial borax, high carbon ferro-chrome, rare earth and silicocalcium powder, its process for preparation is as follows:
A. high carbon ferro-chrome, rare earth, silicocalcium are ground into the 90-110 order;
B. borax is ground into 90-110 purpose powder after 400-500 ℃ of dehydration;
C. each component among above-mentioned steps a, the b is prepared in proportion and mix the back 140-160 ℃ of oven dry 2-3 hour; Granular as if being mixed with, then each component all to be allotted in proportion, this moment, bake out temperature should be at 90-110 ℃.
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| CN100582287C (en) * | 2008-05-06 | 2010-01-20 | 山东建筑大学 | Boron-chromium-rare-earth co-seeping agent and its low-temperature co-seeping process below eutectoid line |
| CN103938152B (en) * | 2014-04-01 | 2016-05-04 | 山东建筑大学 | The polynary boriding process of a kind of surface of the work low-temperature solid |
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