CN107779736B - A kind of alloy cast iron and its preparation method and application - Google Patents
A kind of alloy cast iron and its preparation method and application Download PDFInfo
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- CN107779736B CN107779736B CN201610782681.0A CN201610782681A CN107779736B CN 107779736 B CN107779736 B CN 107779736B CN 201610782681 A CN201610782681 A CN 201610782681A CN 107779736 B CN107779736 B CN 107779736B
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- iron
- alloy cast
- 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
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
-
- 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
- C21D2211/009—Pearlite
Abstract
The invention discloses a kind of alloy cast irons and its preparation method and application, belong to metal material field.The alloy cast iron includes the following components'mass percentage: carbon 2.9%-3.1%, silicon 1.8%-2.2%, manganese 0.9%-1%, copper 0.5%-0.6%, molybdenum 0.45%-0.55%, iron 92.45%-92.75% and inevitable impurities balance；In graphite in the metallographic structure of alloy cast iron by carbon generation, the graphite of 63wt%-68wt% is uniformly distributed in the form of flake graphite.The each component coordinated of said ratio in the alloy cast iron, effectively improve the mechanical property of alloy cast iron provided by the invention, reach 190HB-250HB with the part noumenon hardness that the alloy cast iron produces, tensile strength reaches 300MPa or more, fatigue strength reaches 70MPa or more, can be effectively used to production internal combustion engine part.
Description
Technical field
The present invention relates to metal material field, in particular to a kind of alloy cast iron and its preparation method and application.
Background technique
Alloy cast iron is mainly the iron-carbon alloy material that phosphorus content is greater than 2.11%, is widely used in the system of machine components
In making.For example, internal combustion engine part will can be made after alloy cast iron melting, casting, and can be by internal combustion engine use in automobile, agriculture
The fields such as industry machinery, engineering machinery, ship, military mechanical, mobile and stand-by station.Wherein, internal combustion engine includes diesel engine, gasoline
Machine, gas turbine, and the shape of internal combustion engine and internal cavity are generally more complicated, basic skeleton include body, cylinder cap,
Pedestal etc..In practical applications, internal combustion engine mainly passes through burning fuel inside it and generates heat, then outwardly transporting heat energy
Meet the production requirement of different mechanical equipments from kinetic energy, therefore in actual production to the body of internal combustion engine, cylinder cap, pedestal etc. zero
The mechanical property requirements of component are high, to meet the safety that it is used.Therefore it provides a kind of excellent in mechanical performance is used to produce
IC engine airframe, cylinder cap, pedestal alloy cast iron material be very necessary.
Each the zero of internal combustion engine is mainly manufactured as material using gray cast iron such as HT350, HT300, HT250 in the prior art
Part, the component of HT350 gray cast iron is by percentage to the quality are as follows: carbon 2.6%-3.6%, silicon 1.2-3.0%, manganese 0.4%-1.2%,
Copper 0.5%-1%, iron 90.8%-91.7% and inevitable impurities balance.Wherein, HT350 castings of gray cast iron ontology is anti-
Tensile strength can reach 280MPa.
The inventor finds that the existing technology has at least the following problems:
Hardness, tensile strength and the fatigue strength of HT350 castings of gray cast iron do not meet the requirement of production internal combustion engine part.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of hardness, tensile strength and fatigue strength
Excellent alloy cast iron and its preparation method and application.Specific technical solution is as follows:
In a first aspect, the alloy cast iron includes following quality percentage the embodiment of the invention provides a kind of alloy cast iron
The component of ratio: carbon 2.9%-3.1%, silicon 1.8%-2.2%, manganese 0.9%-1%, copper 0.5%-0.6%, molybdenum 0.45%-
0.55%, iron 92.45%-92.75% and inevitable impurities balance.
In the graphite generated in the metallographic structure of the alloy cast iron by carbon, the graphite of 63wt%-68wt% with
The form of flake graphite is uniformly distributed.
Specifically, preferably, in the matrix of the alloy cast iron, the metallic matrix of 95wt%-99wt% is pearl
Body of light.
Second aspect, the embodiment of the invention provides the preparation method of above-mentioned alloy cast iron, the preparation method include with
Lower step:
Step a, according to the mass percent of each component in alloy cast iron, the pig iron, steel, coke are placed in smelting furnace, and
Temperature carries out melting under conditions of being 1500 DEG C -1650 DEG C, forms molten iron.
Step b, stokehold inovulant is added in the iron notch of the smelting furnace, makes the stokehold inovulant with the molten iron one
With flowing into ladle, copper, ferro-molybdenum is then added, obtains to stokehold and breeds molten iron.
Step c, when the stokehold breeds molten iron and reaches pouring temperature, by the stokehold breed molten iron pour into sand mold into
Row casting, during the casting, the stokehold of Xiang Liudong, which is bred, adds random inoculant in molten iron, obtains pregnant with flowing
Educate molten iron.
Step d, cooling down is carried out to the current-following inoculation molten iron, obtains the alloy cast iron.
Specifically, preferably, the pouring temperature is 1350 DEG C -1450 DEG C.
Specifically, preferably, the mass percent that the additional amount of the stokehold inovulant accounts for the molten iron is 0.3%-
0.5%；The mass percent that the additional amount of the random inoculant accounts for the molten iron is 0.15%-0.25%.
Specifically, preferably, the stokehold inovulant is rare earth inovulant and/or barium silica-iron composite inoculant, institute
Stating random inoculant is barium silica-iron composite inoculant.
Specifically, preferably, the rare earth inovulant includes the following components'mass percentage: rare earth 20%-26%,
Silicon 40%-45%, surplus are iron；The barium silica-iron composite inoculant includes the following components'mass percentage: barium 4%-
6%, iron 18%-23%, surplus are silicon.
Specifically, preferably, in the rare earth inovulant and the barium silica-iron composite inoculant mixture, each group
The mass percent of the molten iron shared by point are as follows: rare earth inovulant 0.05%-0.15%, barium silica-iron composite inoculant
0.25%-0.35%.
The third aspect, the embodiment of the invention provides application of the above-mentioned alloy cast iron in manufacture internal combustion engine part.
Technical solution provided in an embodiment of the present invention has the benefit that
In a first aspect, the embodiment of the invention provides a kind of alloy cast iron, by suitably dropping the mass percent of carbon, silicon
It is low, and controlled in the mass range of 2.9%-3.1%, 1.8%-2.2% respectively, it can reduce and be produced at the thin-walled of alloy cast iron
Raw white kalgan lamb skin, which increase the mechanical properties of the alloy cast iron.By being controlled the mass ratio of copper and molybdenum respectively in 0.5%-
0.6%, can be with the graphite in refining alloy cast iron in the range of 0.45%-0.55%, while refining and increasing alloy cast iron
The content of medium pearlite, and then the mechanical properties such as hardness, tensile strength and fatigue strength for increasing alloy cast iron.By controlling manganese
Mass ratio in the range of 0.9%-1%, can reinforced alloys cast iron matrix, while increase carbide the spread and
Stability.Factors above coordinated is uniformly distributed the graphite of 63wt%-68wt% in the form of flake graphite, this is effectively
Ground improves the mechanical property of alloy cast iron provided by the invention, is reached with the part noumenon hardness that the alloy cast iron produces
190HB-250HB, tensile strength reach 300MPa or more, and fatigue strength reaches 70MPa or more, can be effectively used to and prepare internal combustion
Machine part.
Second aspect, the embodiment of the invention provides the preparation method of alloy cast iron, by component contained therein and its
Proportion is defined as above, while by method as described above, can be obtained with excellent hardness, tensile strength and fatigue
The alloy cast iron of the mechanical properties such as intensity.Especially by addition stokehold inovulant and current-following inoculation in above-mentioned preparation process
The economic benefits and social benefits synergistic effect of agent, both inovulants can make to form small crystal grain phase in alloy cast iron, it is thus also avoided that carbide
A large amount of generations, which significantly improves the mechanical properties of alloy cast iron.As it can be seen that the preparation method is simple, it is easy to operate, and can guarantee
Alloy cast iron has excellent mechanical property.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the form of graphite and the gold of distribution situation in 100 times of amplification of alloy cast iron of the offer of the embodiment of the present invention 4
Phase microscope figure；
Fig. 2 is the form and distribution situation for 500 times of amplification of the alloy cast iron medium pearlite that the embodiment of the present invention 4 provides
Metallographic microscope figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
In a first aspect, the alloy cast iron includes following mass percent the embodiment of the invention provides a kind of alloy cast iron
Component: carbon (C) 2.9%-3.1%, silicon (Si) 1.8%-2.2%, manganese (Mn) 0.9%-1%, copper (Cu) 0.5%-0.6%,
Molybdenum (Mo) 0.45%-0.55%, iron (Fe) 92.45%-92.75% and inevitable impurities balance.The gold of alloy cast iron
In graphite in phase constitution by carbon generation, the graphite of 63wt%-68wt% is uniformly distributed in the form of flake graphite.
Alloy cast iron provided in an embodiment of the present invention by suitably reducing the mass percent of carbon, silicon, and controls respectively
In the range of 2.9%-3.1%, 1.8%-2.2%, generation spoken parts in traditional operas at the thin-walled of alloy cast iron can be reduced, which increase this
The mechanical property of alloy cast iron.By being controlled the mass ratio of copper and molybdenum respectively in 0.5%-0.6%, 0.45%-0.55%
In the range of, it can be with the graphite in refining alloy cast iron, while the content of alloy cast iron medium pearlite is refined and increasing, in turn
Increase the mechanical properties such as hardness, tensile strength and the fatigue strength of alloy cast iron.By controlling the mass ratio of manganese in 0.9%-
In the range of 1%, can reinforced alloys cast iron matrix, while increasing the spread and stability of carbide.Factors above association
With cooperation, it is uniformly distributed the graphite of 63wt%-68wt% in the form of flake graphite, this effectively improves the present invention to provide
Alloy cast iron mechanical property, so that its hardness is reached 190HB-250HB, tensile strength reaches 300MPa or more, fatigue strength
Reach 70MPa or more, can be effectively used to and prepare internal combustion engine part.
Specifically, the chemical constituent of the various mass percents of alloy cast iron provided by the invention is as shown in table 1 below:
Table 1
For example, the mass percent of carbon can be 2.9%, 3.0%, 3.1% etc., and the mass percent of silicon can be
1.8%, 1.9%, 2.0%, 2.1%, 2.2% etc., the mass percent of manganese can for 0.9%, 1.0%, etc., the quality hundred of copper
Divide than that can be 0.5%, 0.6% etc., the mass percent of molybdenum can be 0.45%, 0.5%, 0.55% etc., wherein desirably
It is that impurity is not present in alloy cast iron provided in an embodiment of the present invention, but will inevitably introduce during preparation micro
Impurity, such as phosphorus (P) and sulphur (S) etc. will be basic by controlling the percent mass ratio of p and s within 0.1%
It will not influence the comprehensive mechanical property of alloy cast iron.It within the above range by the mass percent control of different material ingredient, can
To guarantee that alloy cast iron provided by the invention has excellent mechanical property, part noumenon hardness can be made to reach 190HB-
250HB, tensile strength reach 300MPa or more, and fatigue strength reaches 70MPa or more, can be effectively used to and prepare zero group of internal combustion engine
Part.
Specifically, in the graphite in the metallographic structure of alloy cast iron by carbon generation, the graphite of 63wt%-68wt% is with piece
The form of shape graphite is uniformly distributed, i.e., the graphite in alloy cast iron tissue phase is mainly formed by material carbon, and in alloy
Major part graphite present in structure of cast iron phase is uniformly distributed in the form of flake graphite (A type graphite), flake graphite (A type stone
Ink) account for all graphite in tissue phase mass percent be 63%-68%, for example, 64%, 65%, 66%, 67%, 68%
Deng.Wherein, the content of flake graphite (A type graphite) is higher, and distribution is more uniform, and the tensile strength and fatigue strength of alloy cast iron are got over
It is good.
Specifically, the ingredient copper of alloy cast iron provided in an embodiment of the present invention and molybdenum can be with elemental copper and ferro-molybdenums
Mode is added to prepare alloy cast iron, wherein cheap, the easy acquisition of ferro-molybdenum, it can also be with the side of copper molybdenum alloy
Formula is added.Wherein, copper and molybdenum have refinement graphite, refine and increase the effect of pearlite, and the synergistic effect of copper and molybdenum makes this hair
In the alloy cast iron matrix of bright offer, the metallic matrix of 95wt%-99wt% is pearlite, and ferrite and carbide are total
Less than 5%, such as the mass percentage content of metallic matrix medium pearlite can be 95%, 96%, 97%, 98%, 99% etc.,
And these pearlite are mainly present in metallic matrix in the form of fine platy, and which improve conjunctions provided in an embodiment of the present invention
The mechanical property of golden cast iron.Preferably, raw material is added in a manner of copper molybdenum alloy, this can substantially increase implementation of the present invention
Density, hardness and the tensile strength for the alloy cast iron that example provides.
Second aspect, the embodiment of the invention provides the preparation method of above-mentioned alloy cast iron, which includes following
Step:
Step 101, according to the mass percent of each component in alloy cast iron, the pig iron, steel, coke are placed in smelting furnace, and
Melting is carried out under conditions of temperature is 1500 DEG C -1650 DEG C, forms molten iron.
Stokehold inovulant is added in the iron notch of smelting furnace step 102, and stokehold inovulant is made to flow into molten iron together with molten iron
Then Bao Zhong is added copper, ferro-molybdenum, obtains to stokehold and breed molten iron.
Step 103, when stokehold breeds molten iron and reaches pouring temperature, molten iron bred into stokehold pour into sand mold and pour
Note, during casting, the stokehold of Xiang Liudong, which is bred, adds random inoculant in molten iron, obtains current-following inoculation molten iron.
Step 104 carries out cooling down to current-following inoculation molten iron, obtains alloy cast iron.
By being defined as above to component contained therein and its proportion, while by method as described above, can obtain
There must be the alloy cast iron casting of the mechanical properties such as excellent hardness, tensile strength and fatigue strength.Especially by above-mentioned
Stokehold inovulant and random inoculant are added in preparation process, the economic benefits and social benefits synergistic effect of both inovulants can make alloy cast iron
In form small crystal grain phase, it is thus also avoided that a large amount of generations of carbide, which significantly improves the mechanical properties of alloy cast iron.It can
To see, the preparation method is simple, and it is easy to operate, and can guarantee that alloy cast iron has excellent mechanical property.
It specifically, in a step 101, is 1500 DEG C -1650 DEG C to the smelting temperature that base iron, steel, coke are set, such as
It can be 1500 DEG C, 1530 DEG C, 1560 DEG C, 1590 DEG C, 1620 DEG C, 1650 DEG C etc., the range that smelting temperature is arranged such guarantees
Most of raw material in raw material components can melt, and the solid matter that does not melt in raw material can flow with raw material liq, expand
It dissipates and is uniformly distributed, which reduce the ingredients of alloy cast iron provided in an embodiment of the present invention there is a phenomenon where being segregated, and is arranged
The range of above-mentioned smelting temperature is conducive to the discharge of gas, field trash in raw mixture, this is equal convenient for forming mechanical property
One alloy cast iron provided by the invention.Preferably, selecting the pig iron, steel scrap, coke to carry out melting, to reduce cost.
Specifically, the temperature of casting in step 103 be 1350 DEG C -1450 DEG C, for example, 1350 DEG C, 1370 DEG C,
1390 DEG C, 1410 DEG C, 1430 DEG C, 1450 DEG C etc..Pouring temperature is excessively high to cause sand mold to expand deformation, and is also easy to produce table
The defects of leachy waste product of face band, pouring temperature is too low, reduces the mobility of molten iron, generates cold shut, pouring temperature is arranged
Within the above range, the alloy cast iron casting provided in an embodiment of the present invention of excellent in mechanical performance can be made.Preferably, pouring
The temperature of note is 1350 DEG C -1400 DEG C, by the temperature setting of casting in such range, it is ensured that the mobility of molten iron is most
It is good, convenient for the optimal alloy cast iron casting provided in an embodiment of the present invention of mechanical property is made.
It is understood that inoculation can reduce the super cooling tendency of molten iron, increase the nucleation capability of graphite, reduces carbonization
A large amount of generations of object, and can reduce the crystallite size of alloy cast iron, this will substantially improve the mechanical property of alloy cast iron.Its
In, in the preparation process of alloy cast iron provided in an embodiment of the present invention, it is added to inovulant twice, i.e., in step 102 and step
The stokehold inovulant and random inoculant added respectively in rapid 103.Because the molten iron after stokehold is bred needs to stop before casting
A period of time, the post inoculation effect that stays for some time easily failed so that stokehold breeds molten iron and reaches suitable pouring temperature,
Therefore random inoculant is added during casting, to improve the effect of inoculation.
Wherein, it is 0.3%-0.5% that the additional amount of stokehold inovulant, which accounts for the mass percent of molten iron, and random inoculant adds
Entering amount to account for the mass percent of molten iron is 0.15%-0.25%, for example, the additional amount of stokehold inovulant accounts for the quality percentage of molten iron
Than that can be 0.3%, 0.35%, 0.4%, 0.45%, 0.5% etc., the additional amount of random inoculant accounts for the quality percentage of molten iron
Than that can be 0.15%, 0.17%, 0.19%, 0.22%, 0.25% etc., two kinds of inovulants that aforementioned proportion is added can make to breed
Processing reaches preferable effect, alloy cast iron provided in an embodiment of the present invention can be made to reach optimal mechanical property at this time.
Specifically, stokehold inovulant is rare earth inovulant and/or barium silica-iron composite inoculant, and random inoculant is barium-
Silicon-iron composite inoculant so selects stokehold inovulant and random inoculant that molten iron can be made fully by inoculation.Such as
Stokehold inovulant is rare earth inovulant, any one in barium silica-iron composite inoculant, or is the mixture of the two.It selects
Both inovulants are easy to obtain mainly due to both inovulants have excellent pregnant effect.Wherein, rare earth inovulant
Include the following components'mass percentage: rare earth 20%-26%, silicon 40%-45%, surplus are iron, such as the quality hundred of rare earth
Point than that can be 20%, 21%, 23%, 24%, 26% etc., the mass percent of silicon can for 40%, 41%, 43%, 44%,
45% etc., surplus is iron；Barium silica-iron composite inoculant includes the following components'mass percentage: barium 4%-6%, iron 18%-
23%, surplus is silicon, such as the mass percent of barium can be 4%, 5%, 6% etc., the mass percent of iron can for 18%,
19%, 20%, 21%, 22%, 23% etc., surplus is silicon.Rare earth inovulant and barium silica-iron composite inoculant is arranged such
Ingredient and ratio can make it perform to optimal inoculation effect.Preferably, stokehold inovulant be rare earth inovulant with
Barium silica-iron composite inoculant mixture, barium silica-iron composite inoculant and rare earth inovulant are used in mixed way, can be played
The effect of the economic benefits and social benefits collaboration of both inovulants, and then inoculation is made to reach optimal inoculation effect.In more detail,
In rare earth inovulant and barium silica-iron composite inoculant mixture, the mass percent of molten iron shared by each component are as follows: rare earth is pregnant
Educate agent 0.05%-0.15%, barium silica-iron composite inoculant 0.25%-0.35%.For example, the quality hundred of rare earth inovulant
Point than that can be 0.05%, 0.1%, 0.15% etc., barium silica-iron composite inoculant mass percent can for 0.25%,
0.27%, 0.3%, 0.32%, 0.35% etc..The above-mentioned mass percent for breeding two kinds of ingredients in agent composition is arranged such just
Reach optimal inoculation effect in making this breed agent composition, and in the mixture mass percent shared by silicon compared with
Height, it reduce the costs that this breeds agent composition.
The third aspect, the embodiment of the invention provides application of the above-mentioned alloy cast iron in manufacture internal combustion engine part.
Alloy cast iron provided in an embodiment of the present invention is 190HB- with the part noumenon hardness that the alloy cast iron produces
240HB, tensile strength reach 300MPa or more, and fatigue strength reaches 70MPa or more, and the mechanical property for meeting internal combustion engine part is wanted
It asks, meets the safety in utilization of internal combustion engine, therefore can be used for manufacturing the higher part of mechanical property requirements in internal combustion engine, such as
The cylinder body of internal combustion engine, cylinder cap, pedestal, piston, connecting rod, drive rod, sealing ring, gear etc..It is understood that of the invention
The alloy cast iron that embodiment provides is not only applicable to internal combustion engine part, applies also for other with the conjunction of excellent mechanical performance
Golden cast iron is the machine components of material.Specifically, the properties of alloy cast iron provided in an embodiment of the present invention such as the following table 2 institute
Show:
Table 2
| Alloy cast iron | Hardness (HB) | Tensile strength (MPa) | Fatigue strength (MPa) |
| Single casting test block | 220-280 | ≥360MPa | ≥70 |
| Attached casting test block | 190-250 | ≥300 | ≥70 |
| Part noumenon | 190-250 | ≥300 | ≥70 |
Hereinafter the present invention will be further described through by specific embodiment.
In following specific embodiments, condition person is not specified in related operation, according to normal conditions or manufacturer
It is recommended that condition carry out.It is raw materials used production firm is not specified and specification person be can be with conventional products that are commercially available.
Embodiment 1
A kind of alloy cast iron casting is present embodiments provided, by percentage to the quality, the group which includes
It is divided into: C 3.1%, Si 2.2%, Mn 1.0%, Cu 0.6%, Mo 0.55%, Fe 92.45%, and it is inevitably remaining
Measure impurity.
Wherein, alloy cast iron casting provided by the present embodiment 1 is prepared via a method which to obtain:
According to the mass percent of above-mentioned each component, the pig iron, steel scrap, coke are placed in smelting furnace, and are 1500 in temperature
Melting is carried out under conditions of DEG C, forms molten iron, and it is compound inoculated then will to account for the Ba-Si-Fe that the mass percent of molten iron is 0.3%
Agent is added in the iron notch of smelting furnace, flows into Ba-Si-Fe composite inoculant in ladle together with molten iron, while copper, molybdenum is added
The alloys such as iron, obtain to stokehold and breed molten iron；When stokehold breeds molten iron and reaches 1350 DEG C, molten iron is bred into stokehold and pours into casting sand
Moulding by casting is carried out in type, during casting, the quality hundred added again in molten iron and account for molten iron is bred in the stokehold of Xiang Liudong
Divide the Ba-Si-Fe composite inoculant than being 0.15%, then cooling down, the alloy cast iron casting of the offer of the present embodiment 1 is provided
Part.Wherein, in Ba-Si-Fe composite inoculant each component mass percent are as follows: Ba 4%, Si 76%, Fe 20%.
Embodiment 2
A kind of alloy cast iron casting is present embodiments provided, by percentage to the quality, the group which includes
It is divided into: C 3.1%, Si 2.1%, Mn 1.0%, Cu 0.5%, Mo 0.55%, Fe 92.65%, and it is inevitably remaining
Measure impurity.
Wherein, alloy cast iron casting provided by the present embodiment 2 is prepared via a method which to obtain:
According to the mass percent of above-mentioned each component, the pig iron, steel scrap, coke are placed in smelting furnace, and are 1520 in temperature
Melting is carried out under conditions of DEG C, forms molten iron, and it is compound inoculated then will to account for the Ba-Si-Fe that the mass percent of molten iron is 0.4%
Agent is added in the iron notch of smelting furnace, flows into Ba-Si-Fe composite inoculant in ladle together with molten iron, while copper, molybdenum is added
The alloys such as iron, obtain to stokehold and breed molten iron；When stokehold breeds molten iron and reaches 1360 DEG C, molten iron is bred into stokehold and pours into casting
It carries out pouring into casting in sand mold, during casting, the matter for being added again in molten iron and accounting for molten iron is bred in the stokehold of Xiang Liudong
The Ba-Si-Fe composite inoculant that percentage is 0.17% is measured, then cooling down, the alloy cast iron of the offer of the present embodiment 2 is provided
Casting.Wherein, in Ba-Si-Fe composite inoculant each component mass percent are as follows: Ba 5%, Si 72%, Fe 23%.
Embodiment 3
A kind of alloy cast iron casting is present embodiments provided, by percentage to the quality, the group which includes
It is divided into: C 3.0%, Si 2.2%, Mn 1.0%, Cu 0.6%, Mo 0.55%, Fe 92.6%, and it is inevitably remaining
Measure impurity.
Wherein, alloy cast iron casting provided by the present embodiment 3 is prepared via a method which to obtain:
According to the mass percent of above-mentioned each component, the pig iron, steel scrap, coke are placed in smelting furnace, and are 1550 in temperature
Melting is carried out under conditions of DEG C, forms molten iron, and it is compound inoculated then will to account for the Ba-Si-Fe that the mass percent of molten iron is 0.4%
The mixture of agent and rare earth inovulant is added in the iron notch of smelting furnace, makes the mixed of Ba-Si-Fe composite inoculant and rare earth inovulant
It closes object to flow into ladle together with molten iron, while the alloys such as copper, molybdenum-iron is added, obtain to stokehold and breed molten iron；It is bred to stokehold
When molten iron reaches 1370 DEG C, molten iron is bred into stokehold pours into and carry out moulding by casting, during casting, Xiang Liudong's in sand mold
Stokehold is bred is added into the Ba-Si-Fe composite inoculant that the mass percent for accounting for molten iron is 0.2% again in molten iron, then drop
Temperature is cooling, obtains the alloy cast iron casting of the offer of the present embodiment 3.
Wherein, Ba-Si-Fe composite inoculant and rare earth inovulant account for the mass percent of molten iron be respectively 0.1%,
0.3%, the mass percent of each component in rare earth inovulant are as follows: rare earth 22%, silicon 42%, iron 36%, Ba-Si-Fe are compound pregnant
Educate the mass percent of each component in agent are as follows: Ba 5%, Si 73%, Fe 22%.
Embodiment 4
A kind of alloy cast iron casting is present embodiments provided, by percentage to the quality, the group which includes
It is divided into: C 3%, Si 2.1%, Mn 1.0%, Cu 0.6%, Mo 0.55%, Fe 92.7% and inevitable surplus
Impurity.
Wherein, alloy cast iron casting provided by the present embodiment 4 is prepared via a method which to obtain:
According to the mass percent of above-mentioned each component, the pig iron, steel scrap, coke are placed in smelting furnace, and are 1600 in temperature
Melting is carried out under conditions of DEG C, forms molten iron, and it is compound inoculated then will to account for the Ba-Si-Fe that the mass percent of molten iron is 0.5%
The mixture of agent and rare earth inovulant is added in the iron notch of smelting furnace, and the mixture inovulant is made to flow into ladle together with molten iron
In, while the alloys such as copper, molybdenum-iron are added, it obtains to stokehold and breeds molten iron；It is when stokehold breeds molten iron and reaches 1400 DEG C, stokehold is pregnant
It educates molten iron and pours into and carry out pouring into casting in the sand mold of casting, during casting, the stokehold of Xiang Liudong is bred in molten iron again
Secondary to enter to account for the Ba-Si-Fe composite inoculant that the mass percent of molten iron is 0.25%, then cooling down, obtains the present embodiment 4
The alloy cast iron casting of offer.
Wherein, Ba-Si-Fe composite inoculant and rare earth inovulant account for the mass percent of molten iron be respectively 0.15%,
0.3%, the mass percent of each component in rare earth inovulant are as follows: rare earth 24%, silicon 44%, iron 32%, Ba-Si-Fe are compound pregnant
Educate the mass percent of each component in agent are as follows: Ba 5%, Si 75%, Fe 20%
Alloy cast iron casting manufactured in the present embodiment is sampled and carries out Metallographic Analysis.Wherein, attached drawing 1 be the present embodiment provides
100 times of amplification of alloy cast iron in the form of graphite and the metallographic microscope figure of distribution situation, it can be seen from attached drawing 1 this
66wt% graphite in the metallographic microscope for the alloy cast iron sample that embodiment provides is mainly equal in the form of flake graphite (A type graphite)
The flake graphite (A type graphite) of even distribution, this high-content can substantially improve alloy cast iron sample provided in this embodiment
Tensile strength and fatigue strength.
Attached drawing 2 is the form of the alloy cast iron medium pearlite of 500 times of amplification provided in this embodiment and the gold of distribution situation
Phase microscope figure, the quality of the pearlite it can be seen from attached drawing 2 in the metallographic microscope of alloy cast iron sample provided in this embodiment
Percentage is about the 95% of metallic matrix, and is mainly present in metallic matrix in the form of fine platy, this high-content
Fine pearlite can substantially improve the mechanical property of alloy cast iron sample provided in this embodiment.
Embodiment 5
The present embodiment is by the following method to the mechanical property and fatigue of the embodiment 1-4 alloy cast iron casting ontology provided
Performance is tested:
Using Brinell hardness test come the hardness of the testing example 1-4 alloy cast iron sample provided, wherein Brinell hardness
The method that is well known to those skilled in the art of test method, this will not be detailed here；Using standard " GB/T 228.1-2010
Metal material stretching test " offer method testing example 1-4 provide alloy cast iron sample tensile strength；Using mark
What the method testing example 1-4 that quasi- " GB/T 3075-2008 Metal Material Fatigue tests axial force control method " provides was provided
Axial tension-compressive fatigue strength of alloy cast iron casting bulk sample, the alloy cast iron that the embodiment 1-4 specifically tested is provided
The results are shown in Table 3 for the hardness of casting bulk sample, tensile strength, fatigue strength:
Table 3
| Alloy cast iron | Hardness (HB) | Tensile strength (MPa) | Fatigue strength (MPa) |
| Embodiment 1 | 220 | 361 | 70 |
| Embodiment 2 | 230 | 365 | 77 |
| Embodiment 3 | 250 | 367 | 80 |
| Embodiment 4 | 260 | 372 | 90 |
By table 3 it can be concluded that, it is the hardness of alloy cast iron casting sample that 1-4 of the embodiment of the present invention is provided, tensile strength, tired
Labor intensity has reached the requirement of the part of manufacture internal combustion engine, it is seen then that alloy cast iron provided in an embodiment of the present invention has excellent
Mechanical property, can be used in produce internal combustion engine various pieces part.
The foregoing is merely presently preferred embodiments of the present invention, the protection scope being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (8)
1. a kind of alloy cast iron, which is characterized in that the alloy cast iron includes the following components'mass percentage: carbon 2.9%-
3.1%, silicon 1.8%-2.2%, manganese 0.9%-1%, copper 0.5%-0.6%, molybdenum 0.45%-0.55%, iron 92.45%-
92.75% and inevitable impurities balance；
In graphite in the metallographic structure of the alloy cast iron by carbon generation, the graphite of 63wt%-68wt% is with sheet
The form of graphite is uniformly distributed,
In the matrix of the alloy cast iron, the metallic matrix of 95wt%-99wt% is pearlite, these pearlite are with shred
The form of shape is present in the metallic matrix, and ferrite and carbide are total less than 5%, and raw material is added in a manner of copper molybdenum alloy
Enter.
2. the preparation method of alloy cast iron described in claim 1, which is characterized in that the preparation method comprises the following steps:
Step a, according to the mass percent of each component in alloy cast iron, the pig iron, steel, coke are placed in smelting furnace, and in temperature
Melting is carried out under conditions of being 1500 DEG C -1650 DEG C, forms molten iron；
Step b, stokehold inovulant is added in the iron notch of the smelting furnace, makes the stokehold inovulant with one cocurrent flow of molten iron
Enter in ladle, copper, ferro-molybdenum is then added, obtains to stokehold and breeds molten iron；
Step c, it when the stokehold breeds molten iron and reaches pouring temperature, molten iron is bred into the stokehold pours into sand mold and pour
Note, during the casting, the stokehold of Xiang Liudong, which is bred, adds random inoculant in molten iron, obtains current-following inoculation iron
Water；
Step d, cooling down is carried out to the current-following inoculation molten iron, obtains the alloy cast iron.
3. preparation method according to claim 2, which is characterized in that the pouring temperature is 1350 DEG C -1450 DEG C.
4. preparation method according to claim 2, which is characterized in that the additional amount of the stokehold inovulant accounts for the molten iron
Mass percent be 0.3%-0.5%；
The mass percent that the additional amount of the random inoculant accounts for the molten iron is 0.15%-0.25%.
5. preparation method according to claim 2, which is characterized in that the stokehold inovulant be rare earth inovulant and/or
Barium silica-iron composite inoculant, the random inoculant are barium silica-iron composite inoculant.
6. preparation method according to claim 5, which is characterized in that the rare earth inovulant includes following mass percent
Component: rare earth 20%-26%, silicon 40%-45%, surplus be iron；
The barium silica-iron composite inoculant includes the following components'mass percentage: barium 4%-6%, iron 18%-23%, surplus
For silicon.
7. preparation method according to claim 5, which is characterized in that the rare earth inovulant and the barium silica-iron are compound
In the mixture of inovulant, the mass percent of the molten iron shared by each component are as follows: rare earth inovulant 0.05%-0.15%, barium-
Silicon-iron composite inoculant 0.25%-0.35%.
8. application of the alloy cast iron described in claim 1 in manufacture internal combustion engine part.
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| CN108746508B (en) * | 2018-07-03 | 2020-10-16 | 宁波力古机械制造有限公司 | Production process of multi-alloy cylinder cover |
| CN109694981A (en) * | 2019-01-07 | 2019-04-30 | 陕西柴油机重工有限公司 | Full A type graphite material of high-power diesel engine body and preparation method thereof |
| IT201900016835A1 (en) * | 2019-09-20 | 2021-03-20 | Cofren Srl | PAIR OF DISC / BRAKE FRICTION FOR RAILWAY VEHICLES |
| CN110777292A (en) * | 2019-10-22 | 2020-02-11 | 山东力得汽车科技股份有限公司 | Production method for performing tip passivation on flake graphite of flake graphite cast iron |
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