CN102140604A - Low-temperature vanadium adding method for preparing VCp/Fe composite material by using in-situ reaction casting process - Google Patents
Low-temperature vanadium adding method for preparing VCp/Fe composite material by using in-situ reaction casting process Download PDFInfo
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Abstract
The invention discloses a low-temperature vanadium adding method for preparing a VCp/Fe composite material by using an in-situ reaction casting process, which comprises the steps of: putting pig iron required to be cast and 3/4 part by weight of low-carbon steel in an intermediate-frequency induction furnace, raising the temperature and melting all the metal materials in the furnace, adding the balance of steel and 1/4 part of weight of ferrosilicon alloy, stirring the mixture uniformly to enable the metal liquid to be pasty, then adding ferrovanadium particles, stirring the mixture uniformly, adding a covering agent to cover the mixture, heating and preserving heat for slagging off and casting to obtain the VCp/Fe composite material. By using the in-situ reaction casting method disclosed by the invention to prepare the VCp/Fe composite material, and the burnout rate of vanadium can be stabilized at 6.8-7.2 percent and reduced by 44 percent compared with that of the conventional method. The granularity uniformity of particles is improved, the diameter is within 5-11 mum, the particles are distributed uniformly in a basal body and have excellent comprehensive mechanical performance; and the operation process is simple, the production cost is low, and the application prospect is broad.
Description
Technical field
The invention belongs to casting technology field, relate to the low temperature that in-situ reaction casting prepares the VCp/Fe matrix material and add the vanadium method.
Background technology
The ultimate principle of in-situ reaction casting is: in the liquid alloy of certain ingredients, utilize the high temperature of alloy liquid, make between the alloying element in the alloy liquid or the sufficient chemical reaction of generation between alloying element and the compound, generate the ceramic enhanced granule of one or more high rigidity, high elastic coefficient, can obtain by in-situ particle enhanced metal-base composites by casting then.In-situ reaction casting prepares metal-base composites, has avoided the wetting and pollution problem of matrix and enhanced granule, and it is synthetic in the inner original position of matrix to have strengthened particle, and the interface combination is better and the interface is clean, and enhanced granule is evenly distributed in matrix.Prepare the method for iron base composite material with in-situ reaction casting, simple, with low cost because of its technology, make the focus that excellent material performance becomes technological development.
At present, enhanced granule constantly develops to the high-performance direction, and the maximum enhancing body of technological development is SiC, TiC and VC.SiC enhancing body is more common in and is applied in light metal-based matrix material, and TiC, VC enhancing body then is more common in and is applied in steel-based composite material.Compare with the TiCp/Fe matrix material, original position VC particle enhanced steel iron base composite material more is applicable to the higher matrix material of preparation endogenetic particle volume.Show that from numerous composite technology exploitations the wear resistance under the lubricating condition, the erosion resistance in corrosive medium are being arranged, the VCp/Fe matrix material all is better than the TiCp/Fe matrix material.
At present, the technology of utilizing in-situ reaction casting to prepare the VCp/Fe matrix material both at home and abroad generally is: melting Fe-C mother alloy at first, add the pig iron earlier, and treat that pig iron fusing back adds soft steel.After treating the about 1400-1450 of temperature ℃ of both's fusing, add 10～15mm ferro-vanadium particle, and cover, when the Fe-V-C melt is warming up to 1600-1650 ℃, pour into a mould behind the insulation 10min with insulating covering agent.The main drawback of this method is: because the temperature of fusion height, the v element scaling loss is big, and burn out rate is generally 12.6%.
Summary of the invention
Purpose of the present invention: in order to reduce the burn out rate of v element, improve VC particle production rate, make the v element particle diameter little and be evenly distributed, and simple, the suitable industrial mass manufacture of operating procedure, the low temperature that provides a kind of in-situ reaction casting to prepare the VCp/Fe matrix material adds the vanadium method.
The present invention is achieved in that
The low temperature that in-situ reaction casting prepares the VCp/Fe matrix material adds the vanadium method, be that 3/4 parts by weight of the pig iron in the formula material and soft steel are packed in the medium-frequency induction furnace, the intensification melting, temperature is 1400-1450 ℃, after treating that the pig iron and soft steel all melt, add remaining 1/4 parts by weight steel and ferro-silicon and be cooled to 1300-1350 ℃, and stir, then the ferro-vanadium particle is added in the pasty state metal, stir, the pasty state metal is all wrapped up the ferro-vanadium particle, do not allow the ferro-vanadium particle float, add insulating covering agent subsequently and cover, be warming up to 1550-1590 ℃, soaking time is 4-6 minute, and the casting of skimming again promptly obtains the VCp/Fe matrix material.
Above-described formula material, its moiety and parts by weight are: ferro-vanadium particle 475-485 part, pig iron 4150-4250 part, No. 45 steel 4720-4880 parts, ferro-silicon 11-13 part and insulating covering agent 100-120 part.
Above-described formula material, its best moiety and parts by weight are: 480 parts of ferro-vanadium particles, 4200 parts of foundry irons, 4800 parts of No. 45 steel, 110 parts of 12 parts of ferro-silicons and insulating covering agents.
Above-described ferro-vanadium particle, particle diameter are 21～30mm.
Above-described insulating covering agent, its moiety and parts by weight ratio are: NaCl: KCl: NaF: graphite=3: 3: 1: 3.
Advantage of the present invention and positively effect:
1. use in-situ reaction casting of the present invention to prepare the VCp/Fe matrix material, the burn out rate of vanadium can be stabilized in 6.8-7.2%, and adopts conventional method to add vanadium, and the burn out rate of vanadium is generally 12.6%, and the burn out rate of the technical program vanadium has reduced by 44%.
2. the technical program has strengthened the homogeneity of vanadium grain graininess, and diameter concentrates between 5 to the 11 μ m, is evenly distributed, and comprehensive mechanical property is good, and VCp/Fe matrix material Rockwell hardness number on average reaches 52.5, α
kMean value also reaches 11.03; And the VCp/Fe matrix material Rockwell hardness mean value of conventional method preparation has only 46.5, α
kMean value has only 6.88.
3. to add vanadium method technology be feasible to low temperature, and not only the v element oxidization burning loss reduces in preparation process, and because the enhanced granule volume fraction is suitable, and the enhanced granule size is tiny and be evenly distributed, and therefore makes comprehensive mechanical performance better.And operating procedure is simple, and production cost reduces, and has a extensive future.
Embodiment
The invention will be further described below in conjunction with specific embodiment, but they are not limitation of the invention.
Chemical ingredients and parts by weight that the present invention designs the VCp/Fe matrix material are: V is 3.20-3.80, and C is 1.8-2.2, and Si is 0.60-0.80, the Fe surplus.
Starting material title and chemical ingredients (wt%, Fe is surplus)
Embodiment 1:
(1) composition of raw materials (weight part): 480 parts of ferro-vanadium particles, 4200 parts of the pig iron, 4800 parts of No. 45 steel, 110 parts of 12 parts of ferro-silicons and insulating covering agents.
(2) preparation method: 3/4 parts by weight of the pig iron in the formula material and No. 45 steel are packed in the medium-frequency induction furnace, the intensification melting, temperature is 1435 ℃, treats the pig iron and soft steel all after the fusing, adds No. 45 steel and the ferro-silicon of the parts by weight of residue 1/4, be cooled to 1325 ℃, and stir, be that the ferro-vanadium particle of 21-25mm adds in the pasty state metal then with particle diameter, stir, the pasty state metal is all wrapped up the ferro-vanadium particle, do not allow the ferro-vanadium particle float; Add insulating covering agent subsequently and cover, be warming up to 1580 ℃, soaking time is 4 minutes, and the casting of skimming again promptly obtains the VCp/Fe matrix material.
(3) test detected result: the burn out rate of VCp/Fe matrix material vanadium is 6.9%, mechanical property impelling strength (α
k) mean value is 11.43J/cm
2, hardness mean value is 52.7 HRC.
Embodiment 2:
(1) composition of raw materials (weight part): 475 parts of ferro-vanadium particles, 4150 parts of the pig iron, 4720 parts of No. 45 steel, 100 parts of 11 parts of ferro-silicons and insulating covering agents.
(2) preparation method: 3/4 weight part of the pig iron in the formula material and No. 45 steel is packed in the medium-frequency induction furnace, the intensification melting, temperature is 1420 ℃, treats the pig iron and soft steel all after the fusing, adds No. 45 steel and the ferro-silicon of the weight part of residue 1/4, be cooled to 1320 ℃, and stir, be that the ferro-vanadium particle of 26-30mm adds in the pasty state metal then with particle diameter, stir, the pasty state metal is all wrapped up the ferro-vanadium particle, do not allow the ferro-vanadium particle float; Add insulating covering agent subsequently and cover, be warming up to 1560 ℃, soaking time is 5 minutes, and the casting of skimming again promptly obtains the VCp/Fe matrix material.
(3) test detected result: the burn out rate of VCp/Fe matrix material vanadium is 7.2%, mechanical property impelling strength (α
k) mean value is 11.02J/cm
2, hardness mean value is 52.3 HRC.
Embodiment 3:
(1) composition of raw materials (weight part): 485 parts of ferro-vanadium particles, 4250 parts of the pig iron, 4880 parts of No. 45 steel, 120 parts of 13 parts of ferro-silicons and insulating covering agents.
(2) preparation method: 3/4 weight part of the pig iron in the formula material and No. 45 steel is packed in the medium-frequency induction furnace, the intensification melting, temperature is 1450 ℃, treats the pig iron and soft steel all after the fusing, adds No. 45 steel and the ferro-silicon of the weight part of residue 1/4, be cooled to 1350 ℃, and stir, be that the ferro-vanadium particle of 23-27mm adds in the pasty state metal then with particle diameter, stir, the pasty state metal is all wrapped up the ferro-vanadium particle, do not allow the ferro-vanadium particle float; Add insulating covering agent subsequently and cover, be warming up to 1590 ℃, soaking time is 6 minutes, and the casting of skimming again promptly obtains the VCp/Fe matrix material.
(3) test detected result: the burn out rate of VCp/Fe matrix material vanadium is 7.4%, mechanical property impelling strength (α
k) mean value is 11.23J/cm
2, hardness mean value is 52.9 HRC.
Claims (4)
1. the in-situ reaction casting low temperature for preparing the VCp/Fe matrix material adds the vanadium method, it is characterized in that: be that 3/4 parts by weight of the pig iron in the formula material and soft steel are packed in the medium-frequency induction furnace, the intensification melting, temperature is 1400-1450 ℃, after treating that the pig iron and soft steel all melt, the steel and the ferro-silicon that add remaining 1/4 parts by weight are cooled to 1300-1350 ℃, and stir, then the ferro-vanadium particle is added in the pasty state metal, stir, the pasty state metal is all wrapped up the ferro-vanadium particle, do not allow the ferro-vanadium particle float; Add insulating covering agent subsequently and cover, be warming up to 1550-1590 ℃, soaking time is 4-6 minute, and the casting of skimming again obtains the VCp/Fe matrix material;
Described formula material, its moiety and weight part: ferro-vanadium particle 475-485 part, pig iron 4150-4250 part, No. 45 steel 5720-4880 parts, ferro-silicon 11-13 part and insulating covering agent 100-120 part.
2. the low temperature that in-situ reaction casting as claimed in claim 1 prepares the VCp/Fe matrix material adds the vanadium method, it is characterized in that: the composition of described formula material and weight part: 480 parts of ferro-vanadium particles, 4200 parts of foundry irons, 4800 parts of No. 45 steel, 110 parts of 12 parts of ferro-silicons and insulating covering agents.
3. the low temperature that in-situ reaction casting as claimed in claim 1 prepares the VCp/Fe matrix material adds the vanadium method, it is characterized in that: described ferro-vanadium particle, particle diameter are 21～30mm.
4. the low temperature that in-situ reaction casting as claimed in claim 1 prepares the VCp/Fe matrix material adds the vanadium method, it is characterized in that: described insulating covering agent, its composition and weight fraction ratio are: NaCl: KCl: NaF: graphite=3: 3: 1: 3.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935503A (en) * | 2012-11-22 | 2013-02-20 | 广西大学 | Metal-stream powder nitrogenization method for preparing Ti(C,N) particle-reinforced iron-base composite material by in-situ reaction casting |
| CN105734462A (en) * | 2016-05-04 | 2016-07-06 | 芜湖市爱德运输机械有限公司 | Corrosion-resistant double-tube spiral feeding machine |
| CN105779871A (en) * | 2016-05-04 | 2016-07-20 | 芜湖市爱德运输机械有限公司 | Corrosion-resistant cement clinker warehouse top conveyor |
| CN105886913A (en) * | 2016-05-04 | 2016-08-24 | 芜湖市爱德运输机械有限公司 | Corrosion-resisting pipe type steady-flow feeder |
| CN114480983A (en) * | 2022-01-26 | 2022-05-13 | 华中科技大学 | Fe alloy for refining grains by utilizing solute interaction at front edge of solidification interface and preparation method thereof |
| CN115846603A (en) * | 2022-12-06 | 2023-03-28 | 宁波日月精华精密制造有限公司 | Covering slag for smelting low-carbon steel in intermediate frequency furnace and preparation method and application thereof |
Citations (1)
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| CN101104903A (en) * | 2007-08-07 | 2008-01-16 | 广西大学 | Low-temperature titanium addition method for preparing TiCp/Fe composite material by in situ reaction casting method |
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2010
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| CN101104903A (en) * | 2007-08-07 | 2008-01-16 | 广西大学 | Low-temperature titanium addition method for preparing TiCp/Fe composite material by in situ reaction casting method |
Non-Patent Citations (2)
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| 《中国优秀硕士学位论文 工程科技I辑》 20080915 隆丹宁 原位自生TiCp/Fe、VCp/Fe复合材料制备过程覆盖剂及低温加Ti法低温加V法的研究 B022-165 1-4 , 第9期 * |
| 《材料科学与工艺》 20070228 姚秀荣等 VCp/Fe复合材料的耐蚀性研究 第145-148页 1-4 第15卷, 第1期 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935503A (en) * | 2012-11-22 | 2013-02-20 | 广西大学 | Metal-stream powder nitrogenization method for preparing Ti(C,N) particle-reinforced iron-base composite material by in-situ reaction casting |
| CN105734462A (en) * | 2016-05-04 | 2016-07-06 | 芜湖市爱德运输机械有限公司 | Corrosion-resistant double-tube spiral feeding machine |
| CN105779871A (en) * | 2016-05-04 | 2016-07-20 | 芜湖市爱德运输机械有限公司 | Corrosion-resistant cement clinker warehouse top conveyor |
| CN105886913A (en) * | 2016-05-04 | 2016-08-24 | 芜湖市爱德运输机械有限公司 | Corrosion-resisting pipe type steady-flow feeder |
| CN114480983A (en) * | 2022-01-26 | 2022-05-13 | 华中科技大学 | Fe alloy for refining grains by utilizing solute interaction at front edge of solidification interface and preparation method thereof |
| CN115846603A (en) * | 2022-12-06 | 2023-03-28 | 宁波日月精华精密制造有限公司 | Covering slag for smelting low-carbon steel in intermediate frequency furnace and preparation method and application thereof |
| CN115846603B (en) * | 2022-12-06 | 2023-09-26 | 宁波日月精华精密制造有限公司 | Covering slag for smelting low-carbon steel in intermediate frequency furnace and preparation method and application thereof |
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Application publication date: 20110803 |