CN1231609C - Nodular cast iron containing vanadium bainite and its production process - Google Patents
Nodular cast iron containing vanadium bainite and its production process Download PDFInfo
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- CN1231609C CN1231609C CN 00135192 CN00135192A CN1231609C CN 1231609 C CN1231609 C CN 1231609C CN 00135192 CN00135192 CN 00135192 CN 00135192 A CN00135192 A CN 00135192A CN 1231609 C CN1231609 C CN 1231609C
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- bainite
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Abstract
The present invention relates to bainite nodular cast iron containing vanadium and a production technology thereof, which belongs to the technical field of metal materials. The present invention provides bainite nodular cast iron containing vanadium which mainly contains 2.5 to 3.8% of C, 1.5 to 3.5% of Si, 2.0 to 4.0% of Mn and 0.2 to 0.6% of V. The bainite nodular cast iron containing vanadium has the structural characteristic that the bainite nodular cast iron containing vanadium comprises bainite, graphite a small amount of martensite and a small amount of residual austenite; the bainite nodular cast iron containing vanadium has the property characteristics that the tensile strength (sigma<b>) is at least 350MPa, the HRC is at least 45, and the impact work(a<k>)is at least 8 J/cm<2>. The bainite nodular cast iron containing vanadium can be used for producing castings having the advantages of high strength and high abrasion resistance. The present invention has the advantages that the bainite is obviously refined, and the mechanical performance and the abrasion resistance are enhanced.
Description
Technical field
The invention provides a kind of vanadium bainite ductile iron material and production technique thereof of containing.Belong to the metallic substance technical field.
Background technology
The technology of producing bainite ductile iron at present both at home and abroad mainly contains three kinds: a kind of for adopting common spheroidal graphite cast iron production technique to produce spheroidal graphite cast iron, and carry out isothermal quenching then and obtain bainite structure.Bainite ductile iron tissue and stable performance that this method is produced, but production technique is complicated, and equipment has high input.Second kind is by adding alloying elements (the alloy total amount is greater than 3%) such as a large amount of nickel, molybdenum, enlarging the bainite transformation zone, thereby directly obtain bainite structure under as-cast condition.The advantage of this method is to have cancelled thermal treatment process, and shortcoming is owing to added a large amount of alloying elements, and casting cost is increased substantially.The third method is by suitable adjustment silicomanganese content, and adds a small amount of alloying element appropriateness expansion bainite transformation zone, adopts the method for continuous Cooling Quenching to obtain bainite structure then.This method production technique is simple, and material cost is lower, is widely used in the less demanding bainite ductile iron foundry goods of production simple shape at present.
In the research and production of bainite ductile iron, also find at present to adopt vanadium to promote the report of bainite transformation and refinement bainite structure." the metal digest " that the online employing spheroidal graphite cast iron+bainite of the present patent application people+vanadium (bainite+ductilecast iron+V or vanadium) has been retrieved the U.S. as term (MetalsAbstracts), " the engineering abstract and indexing " of the U.S. (EI), " CNKI " and the scientific and technical literature index such as " tieing up general Chinese periodical database " of China, all do not find pertinent literature.The applicant has retrieved United States Patent (USP) digest and Europe patent abstract (EP﹠amp; PCT), do not find patent family yet.In Chinese patent, related to the present invention by " V Ti nodular cast iron " patent of people's applications (application number 86104863) such as yellow its body of Casting Inst., Beijing Inst. of Machine and Electricity with ferrite and bainite duplex structure.But this invention and difference of the present invention have following 3 points: the one, this invention be organized as ferrite and bainite duplex structure, and do not have ferritic structure in the tissue of the present invention, so the hardness of material of the present invention is higher, wear resistance is better.The 2nd, the production technique of this invention adopts isothermal quenching, and the continuous Cooling Quenching of material of the present invention, so production technique of the present invention is simpler.The 3rd, this invention is used to produce sliding friction parts such as gear, bent axle, and the present invention then is used to produce big load impacting such as spheroidal graphite machine abrading-ball, slush pump housing and abrasive wear condition, and its wear resistance is better.
Summary of the invention
One of purpose of the present invention is in conjunction with the china natural resources characteristics, and a kind of high-wearing feature, high-intensity bainite ductile iron material are provided.
Two of purpose of the present invention is to provide a kind of production technique for preparing above-mentioned bainite ductile iron material.
For achieving the above object, the present invention adopts following technical scheme:
A kind of vanadium bainite ductile iron material that contains, it is characterized in that the chemical ingredients of this material and weight percentage are:
C 2.5～3.8％、 Si 1.5～3.5％、
Mn 2.0～4.0％、 V 0.2～0.6％、
RE 0.02～0.03%, Fe surplus;
The tissue signature of this material is bainite+globular graphite+a small amount of martensite+small portion of residual austenite, and its performance characteristic is: tensile strength 〉=350Mpa, Rockwell hardness 〉=45, impelling strength 〉=8J/cm
2
Because vanadium can enlarge spheroidal graphite cast iron bainite transformation temperature range, thereby helps the formation of bainite structure.Vanadium has significant refining effect to bainite structure simultaneously, make and contain in the vanadium bainite ductile iron bainite structure than the bainite structure refinement in the common bainite ductile iron more than one times, therefore, owing to the adding of vanadium, can improve the mechanical property and the wear resisting property that contain the vanadium bainite ductile iron effectively among the present invention.
A kind ofly be used to prepare the production technique that contains vanadium bainite ductile iron material, it is characterized in that the concrete steps of this production technique are as follows:
A. casting technique: adopting foundry iron, steel scrap, ferro-silicon, manganeseirom, ferro-vanadium and rare earth alloy or vanadium titanium iron is starting material, and when the mechanical property of material and tissue were had relatively high expectations, other added an amount of molybdenum, copper, nickelalloy; Adopt cupola furnace or medium-frequency induction furnace or arc melting iron liquid; The chemical ingredients of iron liquid (wt%) is: C2.5～3.8, Si1.5～3.5, Mn2.0～4.0, V0.2～0.6, RE0.02～0.03.Tapping temperature is 1430～1500 ℃, and teeming temperature is 1350～1450 ℃.Suitably improve manganese content and can enlarge the austenitic temperature interval of spheroidal graphite cast iron, thereby obtain austenite structure in when helping the thermal treatment heating.Silicon promotes greying in iron liquid process of setting, and improves the hardness of bainite structure in solid-state phase changes.Vanadium promotes the formation and the refinement bainite structure of bainite structure.
B. thermal treatment process: foundry goods is heated to 850～950 ℃, is incubated 3～5 hours, carries out austenitizing and handles.Quench by taking out in the dip quench pond in the stove then, or utilize afterheat in casting to quench, to obtain bainite structure; Quenching finishes and carries out tempering immediately, to eliminate stress; Tempering temperature is controlled at 300～550 ℃ of temperature ranges, is incubated 2 hours, then furnace cooling.Can obtain containing vanadium bainite ductile iron material.
The invention has the advantages that:
1. vanadium promotes bainite transformation, the refinement bainite structure, thus improved the performance of bainite ductile iron.
2. can adopt vanadium titanium iron production, make full use of the pig iron resource characteristic of China, reduce the production cost of bainite ductile iron.
3. adopt continuous Cooling Quenching, thermal treatment process is simple.
The bainite ductile iron material that contains of the present invention is suitable for being used in industries such as metallurgy, mine, building materials career fields such as big load impacting and abrasive wear.
Description of drawings
Fig. 1 is the organization chart of common bainite ductile iron
Fig. 2 is the vanadium bainite ductile iron organization chart that contains of the present invention.
Embodiment
Embodiment one:
Present embodiment adopts vanadium titanium iron production to contain vanadium bainite ductile iron abrading-ball.The finished product abrading-ball is of a size of diameter 80mm.
Contain vanadium bainite ductile iron composition (wt%): C3.6, Si2.5, Mn2.8, V0.4, RE0.022, surplus Fe.Tapping temperature is 1520 ℃, and teeming temperature is 1456 ℃.After abrading-ball solidifies, send quenching furnance immediately, and be heated to 930 ℃, be incubated 2.5 hours, quench by taking out in the stove.Carry out tempering then immediately, tempering temperature is controlled at 450 ℃, is incubated 2 hours, furnace cooling.
What after testing, contain vanadium bainite ductile iron abrading-ball is organized as thin bainite+globular graphite+minor amount of carbide+a small amount of martensite.Its mechanical property is: hardness (HRC) 53, impelling strength 12J/cm
2
Claims (2)
1. one kind contains vanadium bainite ductile iron material, it is characterized in that the chemical ingredients of this material and weight percentage are:
C 2.5～3.8％、 Si 1.5～3.5％、
Mn 2.0～4.0％、 V 0.2～0.6％、
RE 0.02～0.03%, Fe surplus;
The tissue signature of this material is bainite+globular graphite+a small amount of martensite+small portion of residual austenite, and its performance characteristic is: tensile strength 〉=350Mpa, Rockwell hardness 〉=45, impelling strength 〉=8J/cm
2
2. one kind is used to prepare the production technique that contains vanadium bainite ductile iron material according to claim 1, and it is characterized in that: the concrete steps of this production technique are as follows:
A. casting technique: adopting foundry iron, steel scrap, ferro-silicon, manganeseirom, ferro-vanadium and rare earth alloy or vanadium titanium iron is starting material, and when the mechanical property of material and tissue were had relatively high expectations, other added an amount of molybdenum, copper, nickelalloy; Adopt cupola furnace or medium-frequency induction furnace or arc melting iron liquid; The chemical ingredients of iron liquid is: C2.5～3.8wt%, Si1.5～3.5wt%, Mn2.0～4.0wt%, V0.2～0.6wt%, RE0.02～0.03wt%; Tapping temperature is 1430～1500 ℃, and teeming temperature is 1350～1450 ℃;
B. thermal treatment process: foundry goods is heated to 850～950 ℃, is incubated 3～5 hours, quench by taking out in the dip quench pond in the stove, or utilize afterheat in casting to quench; Quenching finishes and carries out tempering immediately, and tempering temperature is controlled at 300～550 ℃ of temperature ranges, is incubated 2 hours, then furnace cooling; Can obtain containing vanadium bainite ductile iron material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00135192 CN1231609C (en) | 2000-12-28 | 2000-12-28 | Nodular cast iron containing vanadium bainite and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00135192 CN1231609C (en) | 2000-12-28 | 2000-12-28 | Nodular cast iron containing vanadium bainite and its production process |
Publications (2)
| Publication Number | Publication Date |
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| CN1361301A CN1361301A (en) | 2002-07-31 |
| CN1231609C true CN1231609C (en) | 2005-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00135192 Expired - Fee Related CN1231609C (en) | 2000-12-28 | 2000-12-28 | Nodular cast iron containing vanadium bainite and its production process |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011058B (en) * | 2010-10-30 | 2013-02-13 | 闫晓峰 | Chromium-vanadium-titanium wear resistant materials and production process thereof |
| CN102330012B (en) * | 2011-09-02 | 2012-11-07 | 上海大学 | Niobium bainite ductile iron material and production process thereof |
| KR101409877B1 (en) * | 2011-11-14 | 2014-06-20 | 엘지전자 주식회사 | Alloy cast iron and manufacturing method of vane using the same |
| CN103060663B (en) * | 2012-12-26 | 2015-08-19 | 宁波市瑞通新材料科技有限公司 | A kind of cast alloy iron abrading-ball |
| CN104178702A (en) * | 2014-08-08 | 2014-12-03 | 无棣向上机械设计服务有限公司 | High-toughness wear-resistant alloy material and preparation method thereof |
| CN107587031A (en) * | 2017-09-27 | 2018-01-16 | 安徽海立精密铸造有限公司 | A kind of casting technique of piston shell |
| CN108504921A (en) * | 2018-07-03 | 2018-09-07 | 宁波力古机械制造有限公司 | A kind of oil-free machine rotor seat and preparation method |
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