CN107779735A - A kind of preparation method of high intensity vermicular cast iron cylinder sleeve - Google Patents
A kind of preparation method of high intensity vermicular cast iron cylinder sleeve Download PDFInfo
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- CN107779735A CN107779735A CN201610766837.6A CN201610766837A CN107779735A CN 107779735 A CN107779735 A CN 107779735A CN 201610766837 A CN201610766837 A CN 201610766837A CN 107779735 A CN107779735 A CN 107779735A
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- cast iron
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- high intensity
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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
- 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
- C21C1/08—Manufacture of cast-iron
-
- 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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0436—Iron
- F05C2201/0439—Cast iron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention discloses a kind of preparation method of high intensity vermicular cast iron cylinder sleeve, is related to cast iron process technology field, comprises the following steps：Raw material, Carbon pick-up, creepage rate, late inoculation, cast, for the first time heat treatment, second of heat treatment are chosen, the product stability that the present invention solves existing process is poor, nodulizing rate is low, thermal fatigue resistance is poor, and tensile strength is low.
Description
Technical field
The present invention relates to cast iron process technology field, more particularly to a kind of preparation side of high intensity vermicular cast iron cylinder sleeve
Method.
Background technology
Vermicular cast iron is a kind of new engineering material between gray cast iron and magnesium iron, has had both the casting character of gray cast iron
The application performance of high intensity, good toughness with spheroidal graphite cast-iron.Therefore, the material possesses good damping, thermal conductivity, wear-resisting
Property.It can be widely used for manufacturing diesel engine body, cylinder cap, cylinder sleeve, brake block, hydraulic valve and ingot mould, glass mold,
The specific power (KW/ Pai Liang ﹒ L) of the demand for development engine of auto industry is increasing, causes the operating temperature of engine more next
Higher, thermic load and the mechanical load of engine are increased considerably, and traditional alloy gray cast-iron and high-strength aluminum alloy can not
Meet requirement.With good casting character, the vermicular cast iron material of excellent heat conductivility, anti-wear performance and anti-fatigue performance
Material turns into the preferred new engineering material of engine designer.At present, existence and stability is poor, nodulizing rate in vermicular cast iron production
It is low, thermal fatigue resistance is poor, the problems such as tensile strength is low, limit the extensive use of vermicular cast iron.
Authorization Notice No. is：The A of CN 102787198 patent：A kind of manufacture method of vermicular cast iron, step are followed successively by stove
Expect preparations, Smelting of iron, creepage rate and pouring cast part, during described creepage rate, by vermiculizer be laid on it is compacted disguise put
Bottom, one layer of sustained release interlayer of covering on vermiculizer, described sustained release interlayer be bushel iron material or inovulant, vermiculizer be layered be laid on it is compacted
Makeup is put, and is separated between layers using sustained release interlayer, after molten iron is entered creepage rate device, progressively with each layer vermiculizer
Reaction, described vermiculizer layering quantity is more than three layers, and the vermiculizer is alloy, and it includes the member of following ratio of weight and number
Plain composition：7~10 parts of 9~12 parts of La, Ce, 2~5 parts of 4~6 parts of Mg, Ca, 22~42 parts of 36~44 parts of Si, Fe are described
Vermiculizer in also include more than one following composition：0.5~1 part of Al, 0.03~0.08 part of Sn, Sb 0.02~0.08
Part, the addition of the vermiculizer alloy accounts for the 0.4~1.4% of iron liquid weight.The vermicular cast iron chilling tendency that the patent obtains is small,
The slenderness ratio of quasiflake graphite is smaller (i.e. quasiflake graphite seems thick), and plasticity and toughness are good, but the patent does not solve stability
Difference, nodulizing rate is low, thermal fatigue resistance is poor, the technical problems such as tensile strength is low.
The content of the invention
It is an object of the invention to provide a kind of preparation method of high intensity vermicular cast iron cylinder sleeve, solve and produce in the prior art
Product stability is poor, nodulizing rate is low, thermal fatigue resistance is poor, tensile strength low technical problem；
A kind of preparation method of high intensity vermicular cast iron cylinder sleeve, comprises the following steps：
It is iron liquid by scrap melting, by weight percentage, the iron liquid includes：C：2.8-3.6%, Si：1.2-
1.5%th, Mn：0.4-0.8%, P：0-0.1%, S：0.06-0.08%, remaining be iron；
The carburant for accounting for iron liquid weight 2.5-3% is added, is stirred, the rotating speed of the stirring is 20-40rad/min,
Time is 1-2min；
The bonded hard ferrite magnet is controlled at 1400-1500 DEG C, adds Langaloy compactedization for accounting for iron liquid weight 0.5-0.8%
Agent and 0.2-0.3% high-silicon silicon steel sheet, carry out inoculation；
The silicon strontium inovulant for accounting for iron liquid weight 0.2-0.3% is added, carries out late inoculation, the temperature control of the late inoculation
System is at 1300-1350 DEG C；
After the late inoculation processing, iron liquid casting is finished, Cast iron liner base substrate is made；
The surface of the Cast iron liner base substrate is polished, heat-treatment furnace is then fed into and is heated, after the completion of heating
It is sent into salt bath furnace and is incubated；
Cast iron liner base substrate after the insulation is put into quenching oil and quenched, after the completion of obtain Cast iron liner.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement：
Further, the carburant is low nitrogen carburant, and the beneficial effect using this step is to reduce the impurity in product.
Further, by weight percentage, the Langaloy vermiculizer in the step (3) includes Ni:12%-
15%th, Cr：0.1-0.4%, Mo：0.1-0.4%, Re：9-10%, Ca：4-6%, Mg：2-4%, Si：30-35%, remaining as
Iron, the beneficial effect using this step are that the stability, wearability and thermal fatigue resistance of product are improved by Langaloy vermiculizer
Property.
Further, by weight percentage, the high-silicon silicon steel sheet includes：C ＜ 0.25%, Si 1.5-2.6%, Mn
For 0.2-0.3%, S ＜ 0.1%, P ＜ 0.1%.
Further, the iron liquid casting is poured into a mould for top pouring type.
Further, the temperature of the heat-treatment furnace heating is 880-900 DEG C, time 0.5-1h；The temperature of the insulation
Spend for 270-350 DEG C, the time of insulation is 0.5-3h, and the beneficial effect using this step is to reduce product to produce because of heat fatigue
Crack growth amount, improve the overall fatigue resistance of product.
Further, the temperature of the quenching oil is 80-100 DEG C.
Beneficial effects of the present invention：
The present invention is a kind of preparation method of high intensity vermicular cast iron cylinder sleeve, first by scrap melting, is then carried out at carburetting
Reason, wherein the carburant added is low nitrogen carburant, the impurity in product is reduced with this, the vermiculizer of selection is Langaloy
Vermiculizer, the stability of product and wear-resistant can be so improved, and product can be reduced because micro-crack caused by heat fatigue
Increment, improve the thermal fatigue resistance of product；Then it is heat-treated twice, so as to improve the overall wearability of product and strong
Degree.
Embodiment
Technical scheme is clearly and completely described below, it is clear that described embodiment is the present invention
Part of the embodiment, rather than whole embodiments, based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, belongs to the scope of protection of the invention.
Embodiment 1：
A kind of preparation method of high intensity vermicular cast iron cylinder sleeve, comprises the following steps：
It is iron liquid by scrap melting, by weight percentage, the iron liquid includes：C：2.8%th, Si：1.2%th, Mn：
0.4%th, P：0%th, S：0.06%th, remaining is iron；
Addition accounts for the carburant of iron liquid weight 2.5%, is stirred, and the rotating speed of the stirring is 20rad/min, and the time is
1min；
The bonded hard ferrite magnet is controlled at 1400 DEG C, adds the Langaloy vermiculizer and 0.2% for accounting for iron liquid weight 0.5%
High-silicon silicon steel sheet, carry out inoculation；By weight percentage, wherein Langaloy vermiculizer includes Ni:12%th, Cr：
0.1%th, Mo：0.1%th, Re：9%th, Ca：4%th, Mg：2%th, Si：30%th, remaining as iron, test proves that Langaloy compactedization
Agent, it is possible to increase nodulizing rate, and it is capable of the stability of product, wearability, in anti-fatigue test, it can effectively reduce fine fisssure
Line, Mo and Cr is added, the tensile strength of product can be improved and reduce elongation, wherein high-silicon silicon steel sheet includes：C ＜
0.25%, Si 1.5%, Mn 0.2%, S ＜ 0.1%, P ＜ 0.1%.
The silicon strontium inovulant for accounting for iron liquid weight 0.2% is added, carries out late inoculation, the late inoculation temperature control exists
1300℃；
After the late inoculation processing, iron liquid casting is finished, Cast iron liner base substrate is made, used pouring type is
Top pouring type is poured into a mould, and so can shorten the duration of pouring, reduces baking of the iron liquid to sand mold, and the quality of product is improved with this.
Grinding process is carried out to the Cast iron liner billet surface, heat-treatment furnace is then fed into and is heated, heating is completed
It is sent into salt bath furnace and is incubated afterwards, the temperature of heating is 880 DEG C, time 0.5h；The temperature of insulation is 270 DEG C, during insulation
Between be 0.5h.
Cast iron liner base substrate after insulation is put into quenching oil and quenched, after the completion of obtain Cast iron liner, wherein quenching
The temperature of kerosene is 80 DEG C, by being heat-treated twice, can reduce product caused crack growth amount, raising because of heat fatigue
The overall fatigue resistance of product.
Embodiment 2：
A kind of preparation method of high intensity vermicular cast iron cylinder sleeve, comprises the following steps：
It is iron liquid by scrap melting, by weight percentage, the iron liquid includes：C：3.6%th, Si：1.5%th, Mn：
0.8%th, P：0.1%th, S：0.08%th, remaining is iron；
Add and account for iron liquid weight 2.5-3% carburant, be stirred, the rotating speed of the stirring is 40rad/min, the time
For 2min；Wherein carburant is low nitrogen carburant, can so reduce the impurity in product；
The bonded hard ferrite magnet is controlled at 1500 DEG C, adds the Langaloy vermiculizer and 0.3% for accounting for iron liquid weight 0.8%
High-silicon silicon steel sheet, carry out inoculation；By weight percentage, wherein Langaloy vermiculizer includes Ni:15%th, Cr：
0.4%th, Mo：0.4%th, Re：10%th, Ca：6%th, Mg：4%th, Si：35%th, remaining as iron, test proves that Langaloy is compacted
Agent, it is possible to increase nodulizing rate, and it is capable of the stability of product, wearability, in anti-fatigue test, can effectively it reduce micro-
Crackle, Mo and Cr is added, the tensile strength of product can be improved and reduce elongation, wherein high-silicon silicon steel sheet includes：C ＜
0.25%, Si 2.6%, Mn 0.3%, S ＜ 0.1%, P ＜ 0.1%.
The silicon strontium inovulant for accounting for iron liquid weight 0.3% is added, carries out late inoculation, the temperature control of the late inoculation exists
1350℃；
After the late inoculation processing, iron liquid casting is finished, Cast iron liner base substrate is made, used pouring type is
Top pouring type is poured into a mould, and so can shorten the duration of pouring, reduces baking of the iron liquid to sand mold, and the quality of product is improved with this.
Grinding process is carried out to the surface of the Cast iron liner base substrate, heat-treatment furnace is then fed into and is heated, heated
It is incubated into rear feeding salt bath furnace, the temperature of heating is 900 DEG C, time 1h；The temperature of insulation is 350 DEG C, during insulation
Between be 3h.
Cast iron liner base substrate after insulation is put into quenching oil and quenched, after the completion of obtain Cast iron liner, wherein quenching
The temperature of kerosene be 100 DEG C, by being heat-treated twice, can reduce product because of heat fatigue caused crack growth amount, carry
The overall fatigue resistance of high product.
Embodiment 3：
A kind of preparation method of high intensity vermicular cast iron cylinder sleeve, comprises the following steps：
It is iron liquid by scrap melting, by weight percentage, the iron liquid includes：C：3.2%th, Si：1.2%th, Mn：
0.6%th, P：0.1%th, S：0.08%th, remaining is iron；
Addition accounts for the carburant of iron liquid weight 3%, is stirred, and the rotating speed of the stirring is 30rad/min, and the time is
2min；
The bonded hard ferrite magnet is controlled at 1400 DEG C, adds the Langaloy vermiculizer and 0.3% for accounting for iron liquid weight 0.8%
High-silicon silicon steel sheet, carry out inoculation；By weight percentage, wherein Langaloy vermiculizer includes Ni:14%th, Cr：
0.3%th, Mo：0.4%th, Re：10%th, Ca：6%th, Mg：4%th, Si：35%th, remaining as iron, test proves that Langaloy is compacted
Agent, it is possible to increase nodulizing rate, and it is capable of the stability of product, wearability, in anti-fatigue test, can effectively it reduce micro-
Crackle, Mo and Cr is added, the tensile strength of product can be improved and reduce elongation, wherein high-silicon silicon steel sheet includes：C ＜
0.25%, Si 2%, Mn 0.2%, S ＜ 0.1%, P ＜ 0.1%.
The silicon strontium inovulant for accounting for iron liquid weight 0.3% is added, carries out late inoculation, the late inoculation temperature control exists
13000℃；
After the late inoculation processing, iron liquid casting is finished, Cast iron liner base substrate is made, used pouring type is
Top pouring type is poured into a mould, and so can shorten the duration of pouring, reduces baking of the iron liquid to sand mold, and the quality of product is improved with this.
Grinding process is carried out to the surface of Cast iron liner base substrate, heat-treatment furnace is then fed into and is heated, after the completion of heating
It is sent into salt bath furnace and is incubated, the temperature of heating is 900 DEG C, time 1h；The temperature of insulation is 270 DEG C, and soaking time is
0.5h。
Cast iron liner base substrate after insulation is put into quenching oil and quenched, after the completion of obtain Cast iron liner, wherein quenching
The temperature of kerosene is 90 DEG C, by being heat-treated twice, can reduce product caused crack growth amount, raising because of heat fatigue
The overall fatigue resistance of product.
Table one：Embodiment and the performance comparison of product made from prior art：
It was found from list data, in the described embodiment, when Ni, Cr, Mo content uprise, nodulizing rate, tensile strength
Can gradually it uprise, but elongation can reduce, and work as Ni:14%th, Cr：0.3%th, Mo：When 0.4%, nodulizing rate, tensile strength and stretch
Long rate can reach optimum balance numerical value, have good combination property；In the described embodiment, the temperature being heat-treated for the first time
It is higher, the time is longer, fatigue resistance is better, and the temperature of second heat treatment is lower, and the time is shorter, and fatigue resistance is better, wherein
Product made from heat treatment by embodiment 3, fatigue resistance is best, and Crack Extension increment is minimum.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (7)
1. a kind of preparation method of high intensity vermicular cast iron cylinder sleeve, it is characterised in that comprise the following steps：
It is iron liquid by scrap melting, by weight percentage, the iron liquid includes：C：2.8-3.6%, Si：1.2-1.5%, Mn：
0.4-0.8%, P：0-0.1%, S：0.06-0.08%, remaining be iron；
Add and account for iron liquid weight 2.5-3% carburant, be stirred, the rotating speed of the stirring is 20-40rad/min, the time
For 1-2min；
By the bonded hard ferrite magnet control at 1400-1500 DEG C, add account for iron liquid weight 0.5-0.8% Langaloy vermiculizer and
0.2-0.3% high-silicon silicon steel sheet, carry out inoculation；
The silicon strontium inovulant for accounting for iron liquid weight 0.2-0.3% is added, carries out late inoculation, the temperature control of the late inoculation exists
1300-1350℃；
After the late inoculation processing, iron liquid casting is finished, Cast iron liner base substrate is made；
The surface of the Cast iron liner base substrate is polished, heat-treatment furnace is then fed into and is heated, is sent into after the completion of heating
It is incubated in salt bath furnace；
Cast iron liner base substrate after the insulation is put into quenching oil and quenched, after the completion of obtain Cast iron liner.
2. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 1, it is characterised in that the carburant is
Low nitrogen carburant.
3. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 2, it is characterised in that with percentage by weight
Meter, the Langaloy vermiculizer include Ni:12%-15%, Cr：0.1-0.4%, Mo：0.1-0.4%, Re：9-10%, Ca：
4-6%, Mg：2-4%, Si：30-35%, remaining as iron.
4. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 3, it is characterised in that with percentage by weight
Meter, the high-silicon silicon steel sheet include：C ＜ 0.25%, Si 1.5-2.6%, Mn 0.2-0.3%, S ＜ 0.1%, P ＜
0.1%.
5. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 4, it is characterised in that the iron liquid casting
Poured into a mould for top pouring type.
6. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 5, it is characterised in that the heat-treatment furnace
The temperature of heating is 880-900 DEG C, time 0.5-1h；The temperature of the insulation is 270-350 DEG C, and the time of insulation is 0.5-
3h。
7. the preparation method of high intensity vermicular cast iron cylinder sleeve according to claim 6, it is characterised in that the quenching oil
Temperature is 80-100 DEG C.
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| CN201610766837.6A CN107779735A (en) | 2016-08-29 | 2016-08-29 | A kind of preparation method of high intensity vermicular cast iron cylinder sleeve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113355495A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Conditioning vermicular graphite cast iron, conditioning method of vermicular graphite cast iron and application of conditioning method |
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| CN113355495A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Conditioning vermicular graphite cast iron, conditioning method of vermicular graphite cast iron and application of conditioning method |
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Application publication date: 20180309 |