CN108754302B - A kind of high-ductility high wear-resistant carbide-containing austempering ductile iron and preparation method thereof - Google Patents
A kind of high-ductility high wear-resistant carbide-containing austempering ductile iron and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
A kind of high-ductility high wear-resistant carbide-containing austempering ductile iron and preparation method thereof, belongs to wear-resistant material technical field.Produce the spheroidal graphite cast-iron (wt%) of following chemical component: C:3.3-3.8, Si:1.3-1.7, Mn:0.4-0.7, Cr:1.0-1.5, P≤0.040；S≤0.007, surplus Fe.Antioxidant is smeared in cast(ing) surface, it is put into heat-treatment furnace, it is heated to 1080-1110 DEG C, and keeps the temperature 10-15min, comes out of the stove and is air-cooled to 300~350 DEG C, back into stove heating to 880-900 DEG C, and 90-150min is kept the temperature, after taking out rapidly, it is put into the nitric acid salt melt that temperature is 250~320 DEG C, and 1-3h is kept the temperature, it then takes out and is cooled to room temperature in air.Impact flexibility improves 120% or more, while not reducing hardness and wearability.
Description
Technical field
The invention discloses a kind of preparation methods of carbide-containing austempering ductile iron, particularly disclose a kind of raising
The heat treatment method of toughness and wearability belongs to wear-resistant material technical field.
Background technique
Mine wet milk abrading-ball consumption is big, wide application, and about 2,400,000 tons of domestic annual consumption or more.Carbide-containing etc.
Temperature quenching spheroidal graphite cast-iron (Carbidic Austempered Ductile Iron, abbreviation CADI) good casting property, density is small,
Wear-resistant corrosive nature is good, at low cost, is ideal wet milk Material quality of grinding balls.But since there are a large amount of eutectics for CADI grain boundaries
Carbide, seriously reduces the impact flexibility of material, and when installation shows the high problem of percentage of damage, limits the application of CADI.
In order to improve the impact flexibility of CADI, Chinese invention patent CN105132790A discloses a kind of difficult to understand containing vanadium carbide
Iron body spheroidal graphite cast-iron, composition and mass percentage are as follows: C:3.20~3.70%；Si:2.50~3.30%；Mn:0.4~
0.8%；P≤0.040%；S≤0.007%；Ce:0.01~0.04%；Mg:0.01~0.04%；Cr:0.30~1.80%；
V:0.25~0.70%；Surplus is iron.Preparation method is as follows: (1) pig iron, steel scrap, manganese iron and vanadium iron being heated melting；(2)
Rare earth magnesium nodularizer is placed in packet bottom groove, inovulant is placed above；1350~1430 DEG C of pouring temperature, the duration of pouring 10~30
Second, spheroidal graphite cast-iron is obtained after cooling；(3) by spheroidal graphite cast-iron after cooling, it is heated to 850-920 DEG C, keeps the temperature 2-4 hours, then
It is put into 280~320 DEG C of 45%KNO3+ 55%NaNO3In fused salt, 1-3 hours are kept the temperature, taking-up is cooled to room temperature, and what is obtained contains vanadium
Carbide Austria iron body spheroidal graphite cast-iron is the good carbide-containing Austria iron body spheroidal graphite casting of a kind of high tenacity high rigidity, comprehensive mechanical property
Iron.
Chinese invention patent CN105274423A also discloses the austempering ductile iron and its system of a kind of carbide-containing
The chemical component of Preparation Method, the spheroidal graphite cast-iron is (wt.%): C:3.3~3.8, Si:1.5~2.5, Cr:0.2~0.7, Mn:
0.4~1.0, Mo:0.2~0.6, V:0.02~0.08, Ni:0.2~0.5, Cu0.15~0.30, Mg0.015~0.030,
RE0.02~0.05, S≤0.080, P≤0.080, Fe surplus.Preparation process includes: that the preparation of raw material and intermediate frequency furnace are smelted；Iron
The spheroidising and inoculation of liquid；Same temperature hardening heat treatment.The invention is by adding trace V element and suitably reducing containing for Si
Amount, to obtain the carbide tissue of small and dispersed distribution, this tissue so that the wear-resisting property of the spheroidal graphite cast-iron improves a lot,
Simultaneously by adding a small amount of Ni, the impact property of spheroidal graphite cast-iron is improved.
Chinese invention patent CN106834902A also disclose a kind of high-wearing feature carbide-containing ausferrite spheroidal graphite cast iron and
Preparation method.In order to provide a kind of high-wearing feature carbide-containing Austria iron body that not only there is good hardness but also there is excellent toughness
Spheroidal graphite cast-iron, invention improve the formula of carbide-containing ausferrite spheroidal graphite cast iron, i.e. its element composition by mass percentage are as follows:
C:3.50~3.90%, Si:2.90~3.50%, Mn:1.30~1.70%, P < 0.08%, S:< 0.012%, RE:0.01
~0.04%, Mg:0.025~0.04%, Cr:0.08~0.18%, V:0.17~0.32%, Ti:0.08~0.18%, Cu:
0.30~0.40%, B:0.001~0.006%, surplus Fe, RE are rare earth metal, preferably Y.Surface hardness up to HRC62 with
On, and impact flexibility is 2-3 times or more of chromium system abrading-ball, has excellent comprehensive performance, is not crushed in use, does not lose circle,
Only xanthenes consumes 200 grams or so for abrasion.
Chinese invention patent CN103131937A also discloses a kind of austempering ductile iron of carbide-containing, feature
It is: the mass percent of chemical element component are as follows: C:3.3~3.7%, Si:2.4~3.3%, Mn:0.2~0.5%, Cr:0.5
~1%, Cu:0.5~0.8%, P < 0.08%, S < 0.025%, Mg:0.03~0.05%, RE:0.02~0.04%, nanometer
Modifying agent 0.02~0.18%, remaining is Fe.Preparation method, raw material is prepared and melting；Spheroidising and inoculation；Nanometer changes
The addition of property agent；Same temperature hardening heat treatment.The utility model has the advantages that making the intensity, hard of austempering ductile iron by nano modifier
Degree, toughness and wearability improve simultaneously.Chinese invention patent CN103060668A also disclose a kind of carbide-containing magnesium iron and its
Preparation method, chemical composition mass percent % are as follows: 3.40~3.65C, 2.35~2.80Si, 2.80~3.15Mn, 1.60
~1.85Cr, 0.04~0.06Mg, 0.03~0.05K, 0.008~0.016Ca, 0.018~0.035Ba, 0.03~0.06Ti,
0.025~0.050V, 0.012~0.018N, < 0.10P, < 0.02S, surplus are Fe and inevitable impurity.Electric furnace can be used
Or cupola melting, it after cast, then through isothermal hardening, can get excellent performance, and low in cost, promote and apply,
It works well.
Chinese invention patent CN106676235A also discloses a kind of processing method of CADI abrading-ball.It is obtained with conventional cast
The manufacturing method of CADI abrading-ball is different, and invention is mainly characterized by: (1) raw material is spheroidal graphite cast-iron bar；(2) by spheroidal graphite cast-iron stick
After material is heated to certain temperature in heating furnace, it is placed in skew rolling mill and semi-finished product ball is made according to oblique milling balling-up principle hot rolling；(3)
Semi-finished product ball finally obtains finished product CADI abrading-ball using the techniques such as isothermal hardening and tempering.The CADI abrading-ball of the present invention manufacture
The advantages of be: (1) high rigidity, high tenacity, have Work Hardening Characteristic；(2) wearability is good, under same working condition, abrasion
The CADI abrading-ball obtained lower than casting；(3) manufacturing defect is few, non-breakable, not volatile circle；(4) density is low, can reduce grinding machine and open
Dynamic and running power；(5) service life for extending grinding machine ancillary equipment, reduces maintenance cost.
Currently, it is CADI that carbide-containing austempering ductile iron, which fails the main reason for being widely used in abrading-ball industry,
Impact flexibility is low, and percentage of damage is high.Especially for the higher CADI of chrome content, grain boundary carbide is more, and stress is concentrated, and causes to rush
It is relatively low to hit toughness, is extremely difficult to high rigidity, high-wearing feature, the perfect match of high tenacity.
Summary of the invention
Object of the present invention is to pass through superhigh temperature patent and means of isothermal quenching, before not reducing hardness and wearability
It puts, greatly improves the impact flexibility of carbide-containing austempering ductile iron, reduce product breakage rate.
A kind of high-ductility high wear-resistant carbide-containing austempering ductile iron of the present invention and preparation method thereof, including it is following
Step:
1. going out the molten iron (wt%) of following chemical component: 3.3- using intermediate frequency (IF) smelting electric furnace or cupola melting first
3.8C, 1.3-1.7Si, 0.4-0.7Mn, 1.0-1.5Cr, P≤0.040；S≤0.007, surplus Fe；It is heated to 1480-1500
DEG C, the deoxidation of 0.15wt% fine aluminium is added, is then transferred in casting ladle；Inovulant and nodulizer are placed in casting ladle bottom, using pouring method
Carry out spheroidising and inoculation；Inovulant uses FeSi75 (containing 75wt%Si), additional amount 1.2wt%；Nodulizer makes
With FeSiMg6Re2 (composition: 6wt%Mg+2wt%Re+40wt%Si, surplus Fe), additional amount 1.5wt% stirs Bao Neijin
Belong to liquid, guarantee fully reacting, and removes slag in packet；1350-1380 DEG C is reached to temperature, type chamber is poured into, after cooling, opens
Casting is obtained after case, cleaning, polishing；
2. being put into heat-treatment furnace after 1. cast(ing) surface that step is obtained smears antioxidant, being heated to 1080-1110
DEG C, and 10-15min is kept the temperature, it comes out of the stove and is air-cooled to 300~350 DEG C, back into stove heating to 880-900 DEG C, and keep the temperature 90-
150min is put into after taking out rapidly by 50wt%KNO3And 50wt%NaNO3The nitrate that the temperature of composition is 250~320 DEG C
Melt, and 1-3h is kept the temperature, it then takes out and is cooled to room temperature in air, obtain high-ductility high wear-resistant carbide-containing isothermal hardening
Spheroidal graphite cast-iron.
Oxygen potential height can be obtained using pouring method inoculation and spheroidising in the present invention, good carbon containing of graphite roundness
Compound spheroidal graphite cast-iron.Carbide volume fraction is 15-25%, and the volume fraction of graphite is 7-12%, remaining is for pearlite and less
Measure ferrite.
Carbide-containing spheroidal graphite cast-iron is heated to 1080-1110 DEG C by the present invention, and keeps the temperature 10-15min, is come out of the stove and is air-cooled to
300~350 DEG C.After the processing of above-mentioned superhigh temperature, the carbide of carbide-containing spheroidal graphite cast-iron crystal boundary is largely dissolved.Eutectic carbon
Compound volume tails off, and carbide network structure is interrupted, and in isolated shape distribution, partially carbonized object tends to be spherical, can obviously increase
The impact flexibility of material.
After the present invention carries out superhigh temperature heat preservation to carbide-containing spheroidal graphite cast-iron, carbon content and alloy content in original austenite
Obvious to rise, during then air-cooled, element is in hypersaturated state in austenite, and it is heavy that part proeutectoid carbide is precipitated
It forms sediment, austenitic matrix can be strengthened.Due to cooling down in air after superhigh temperature, the driving force of secondary carbide precipitation is cold compared with furnace small,
So proeutectoid carbide precipitating is less after air-cooled.
The present invention is after superhigh temperature processing, the cooling casting by the way of air-cooled, it is therefore an objective to reduce original austenite grain and exist
The trend grown up under high temperature, while reducing the time that uses of heat-treatment furnace, simplified heat treatment process.
The present invention is heated to 880-900 DEG C after superhigh temperature patent, then by carbide spheroidal graphite cast-iron, and keeps the temperature 90-
150min.Tissue after air-cooled can be converted into austenite, and during heat preservation, proeutectoid carbide continues to be precipitated.Secondary carbon
After compound is precipitated, neighboring atom irregular arrangement can be used as the nucleation site of bainite ferrite.
The present invention takes out rapidly after 880-900 DEG C of heat preservation 90-150min, and is put by 50wt%KNO3And 50wt%
NaNO3In the nitric acid salt melt that the temperature of composition is 250~320 DEG C, and 1-3h is kept the temperature, then takes out and be cooled to room in air
Temperature can get ultra-fine iron body matrix difficult to understand.
The present invention has the following characteristics that compared with prior art
1) present invention is by the impact flexibility of carbide austempering ductile iron, from 5-10J/cm2, it is increased to 18-22J/
cm2, improve 120% or so.
2) present invention increases wearability while not changing CADI hardness.
3) present invention has refined iron body tissue difficult to understand, and the iron body tissue size difficult to understand finally obtained is three points of normal treatment process
One of, crystal grain refinement has great contribution to the hardness and wearability of material.
4) for the present invention while not reducing hardness, the impact for significantly improving carbide-containing austempering ductile iron is tough
Property, and increase wearability.It applies on wet milk abrading-ball, there is good promotion prospect.
Detailed description of the invention
Fig. 1 present invention obtains carbide-containing austempering ductile iron and scans macrograph.
Specific embodiment
Invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.
Embodiment 1:
Go out the molten iron (wt%) of following chemical component: C:3.45, Si:1.53 using 500 kilograms of intermediate frequency (IF) smelting electro-smeltings,
Mn:0.51, Cr:1.12, P:0.035；S:0.006, surplus Fe.1490 DEG C are heated to, 0.15% fine aluminium deoxidation is added, then turns
Enter in casting ladle.Inovulant and nodulizer are placed in casting ladle bottom, carry out spheroidising and inoculation using the method that pours.Inovulant makes
With FeSi75 (75wt%Si), additional amount 1.2wt%.Nodulizer uses FeSiMg6Re2 (6%Mg+2%Re+40wt%
Si), additional amount 1.5wt% stirs packet inner metal liquid, guarantees fully reacting, and removes slag in packet.Pouring temperature is 1380
DEG C, after cooling, casting is obtained after shake out, cleaning, polishing.
After the cast(ing) surface of acquisition smears antioxidant, it is put into heat-treatment furnace, is heated to 1100 DEG C, and keep the temperature 10min, out
Furnace is air-cooled to 300~320 DEG C, back into stove heating to 880 DEG C, and keeps the temperature 120min, after taking out rapidly, is put by 50wt%
KNO3And 50wt%NaNO3In the nitric acid salt melt that the temperature of composition is 300 DEG C, and 1.5h is kept the temperature, then taken out cold in air
But to room temperature, high-ductility high wear-resistant carbide-containing austempering ductile iron is obtained.Mechanical property is shown in Table 1, and scanning tissue is shown in
Fig. 1.
Embodiment 2:
Go out the molten iron (wt%) of following chemical component: C:3.56, Si:1.48 using 500 kilograms of intermediate frequency (IF) smelting electro-smeltings,
Mn:0.49, Cr:1.34, P:0.031；S:0.007, surplus Fe.1500 DEG C are heated to, 0.15% fine aluminium deoxidation is added, then turns
Enter in casting ladle.Inovulant and nodulizer are placed in casting ladle bottom, carry out spheroidising and inoculation using the method that pours.Inovulant makes
With FeSi75 (75wt%Si), additional amount 1.2wt%.Nodulizer uses FeSiMg6Re2 (6%Mg+2%Re+40wt%
Si), additional amount 1.5wt% stirs packet inner metal liquid, guarantees fully reacting, and removes slag in packet.Pouring temperature is 1351
DEG C, after cooling, casting is obtained after shake out, cleaning, polishing.
After the cast(ing) surface of acquisition smears antioxidant, it is put into heat-treatment furnace, is heated to 1090 DEG C, and keep the temperature 13min, out
Furnace is air-cooled to 330~350 DEG C, back into stove heating to 890 DEG C, and keeps the temperature 110min, after taking out rapidly, is put by 50wt%
KNO3And 50wt%NaNO3In the nitric acid salt melt that the temperature of composition is 290 DEG C, and 1.8h is kept the temperature, then taken out cold in air
But to room temperature, high-ductility high wear-resistant carbide-containing austempering ductile iron is obtained.Mechanical property is shown in Table 1.
Embodiment 3:
Go out the molten iron (wt%) of following chemical component: C:3.52, Si:1.60, Mn:0.54, Cr using cupola melting:
1.45 P:0.031；S:0.007, surplus Fe.1480 DEG C are heated to, 0.15% fine aluminium deoxidation is added, is then transferred in casting ladle.It is pregnant
It educates agent and nodulizer is placed in casting ladle bottom, spheroidising and inoculation are carried out using the method that pours.Inovulant uses FeSi75
(75wt%Si), additional amount 1.2wt%.Nodulizer uses FeSiMg6Re2 (6%Mg+2%Re+40wt%Si), additional amount
For 1.5wt%, packet inner metal liquid is stirred, guarantees fully reacting, and removes slag in packet.Pouring temperature is 1370 DEG C, to be cooled
Afterwards, casting is obtained after shake out, cleaning, polishing.
After the cast(ing) surface of acquisition smears antioxidant, it is put into heat-treatment furnace, is heated to 1110 DEG C, and keep the temperature 12min, out
Furnace is air-cooled to 320~340 DEG C, back into stove heating to 900 DEG C, and keeps the temperature 120min, after taking out rapidly, is put by 50wt%
KNO3And 50wt%NaNO3In the nitric acid salt melt that the temperature of composition is 260 DEG C, and 2.5h is kept the temperature, then taken out cold in air
But to room temperature, high-ductility high wear-resistant carbide-containing austempering ductile iron is obtained.Mechanical property is shown in Table 1.
The mechanical property of 1 carbide-containing austempering ductile iron of table
| Mechanical property | Rockwell hardness (HRC) | Impact flexibility (J/cm2) |
| Embodiment 1 | 51.2 | 21.87 |
| Embodiment 2 | 53.4 | 19.51 |
| Embodiment 3 | 55.7 | 18.67 |
After superhigh temperature patent and isothermal hardening, toughness significantly improves the present invention, and impact flexibility improves 120%
More than, while hardness and wearability are not reduced, iron body crystallite dimension difficult to understand is only the CADI crystallite dimension that common isothermal hardening obtains
One third.Production technology of the present invention is easy, easily operated.Low in cost compared with same performance wear-resistant material, percentage of damage is small, subtracts
Pinking is good, and noise is small.Carbide-containing austempering ductile iron prepared by the present invention scans tissue picture, sees Fig. 1.The present invention exists
There is good application prospect in the wet milk of mine.
Claims (2)
1. a kind of preparation method of high-ductility high wear-resistant carbide-containing austempering ductile iron, which is characterized in that including with
Lower step:
1. go out the molten iron (wt%) of following chemical component: 3.3-3.8C using intermediate frequency (IF) smelting electric furnace or cupola melting first,
1.3-1.7Si, 0.4-0.7Mn, 1.0-1.5Cr, P≤0.040；S≤0.007, surplus Fe；It is heated to 1480-1500 DEG C, is added
0.15wt% fine aluminium deoxidation, is then transferred in casting ladle；Inovulant and nodulizer are placed in casting ladle bottom, carry out nodularization using the method that pours
Processing and inoculation；Inovulant uses FeSi75, additional amount 1.2wt%；Nodulizer uses FeSiMg6Re2, and additional amount is
1.5wt% stirs packet inner metal liquid, guarantees fully reacting, and removes slag in packet；1350-1380 DEG C is reached to temperature, is poured into
Type chamber unpacks, clears up, obtains casting after polishing after cooling；
2. being put into heat-treatment furnace after 1. cast(ing) surface that step is obtained smears antioxidant, it is heated to 1080-1110 DEG C, and
10-15min is kept the temperature, comes out of the stove and is air-cooled to 300~350 DEG C, back into stove heating to 880-900 DEG C, and keep the temperature 90-150min, it is fast
After speed is taken out, it is put by 50wt%KNO3And 50wt%NaNO3In the nitric acid salt melt that the temperature of composition is 250~320 DEG C, and
1-3h is kept the temperature, then takes out and is cooled to room temperature in air, obtains the casting of high-ductility high wear-resistant carbide-containing isothermal hardening spheroidal graphite
Iron；
Wherein FeSiMg6RE2 is formed: 6wt%Mg+2wt%RE+40wt%Si, surplus Fe.
2. a kind of high-ductility high wear-resistant carbide-containing isothermal hardening spheroidal graphite being prepared according to the method for claim 1
Cast iron.
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| CN109852776B (en) * | 2018-12-26 | 2020-09-29 | 天津理工大学 | Fe-C alloy material with ultrahigh carbon content and heat treatment process thereof |
| CN109706380A (en) * | 2019-01-04 | 2019-05-03 | 湖北宏伟成新型材料有限公司 | A kind of preparation method of CADI abrading-ball |
| CN110964973B (en) * | 2019-12-25 | 2021-01-05 | 北京工业大学 | High-manganese CADI and heat treatment method thereof |
| CN113718163A (en) * | 2021-07-20 | 2021-11-30 | 宁国市华丰耐磨材料有限公司 | Relieving and preparation method thereof |
| CN114085941A (en) * | 2021-12-02 | 2022-02-25 | 扬州广润机械有限公司 | Casting process of high-toughness nodular cast iron bushing for wind power |
| CN114395687B (en) * | 2022-01-11 | 2023-09-05 | 钢铁研究总院有限公司 | Ultra-fine cyclic heat treatment process for spheroidal graphite cast iron capable of manufacturing bearing ring |
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| CN101906565B (en) * | 2009-06-08 | 2012-01-04 | 河北工业大学 | Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof |
| US8524016B2 (en) * | 2012-01-03 | 2013-09-03 | General Electric Company | Method of making an austempered ductile iron article |
| CN105274423B (en) * | 2014-06-13 | 2017-02-22 | 中国科学院金属研究所 | Carbide-containing austempered ductile iron and preparation method thereof |
| CN106834888B (en) * | 2017-02-09 | 2018-04-17 | 北京工业大学 | A kind of high-strength abrasion-proof cast steel lining board and preparation method thereof |
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