CN102330012A - Niobium bainite ductile iron material and production process thereof - Google Patents
Niobium bainite ductile iron material and production process thereof Download PDFInfo
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- CN102330012A CN102330012A CN 201110257519 CN201110257519A CN102330012A CN 102330012 A CN102330012 A CN 102330012A CN 201110257519 CN201110257519 CN 201110257519 CN 201110257519 A CN201110257519 A CN 201110257519A CN 102330012 A CN102330012 A CN 102330012A
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Abstract
The invention relates to a niobium bainite ductile iron material and a production process thereof, belonging to the technical field of metal materials. The niobium bainite ductile iron material comprises the following components in percent by weight: 3.5-3.8 percent of C, 2.4-2.8 percent of Si, 1.5-2.2 percent of Mn, 0.2-0.5 percent of Mo, 0.5-0.8 percent of Cu and 0.2-0.6 percent of Nb. The niobium bainite ductile iron material has a texture characteristic of bainite, martensite, austenite, carbide and globular graphite and mechanical characteristics of HRC of 47-49 and Ak of 13-15J/cm<2>. The production process comprises the steps of: 1, casting process, melting after preparing for materials according to a formula, wherein the tapping temperature is 1450-1500 DEG C, the pouring temperature is 1400+/-20 DEG C, nodulizing is carried out by adopting a sandwich process, a nodulizing agent is FeSiMg8RE7 with the consumption of 1.8wt percent, inoculation is carried out by adopting 75SiFe with the consumption of 1.0wt percent; and 2, a heat treatment process, austenitizing at a temperature of 900 DEG C, preserving the temperature for 3h, air-cooling to 300 DEG C for intermediate temperature transition, and preserving the temperature for 2h. The niobium bainite ductile iron material is used in an abrasive-resistance casting, and has low production cost and simple and easy production process; and the mechanical property and the abrasive resistance of the niobium bainite ductile iron material are enhanced after niobium is alloyed.
Description
Technical field
The present invention relates to a kind of niobium bainite ductile iron and production technique thereof of containing, belong to the metallic substance technical field.
Background technology
Bainite ductile iron is a kind of good wear-resistant material, on performance, has higher hardness and impact toughness and impulse fatigue resistance ability, and over-all properties is higher.The excellent comprehensive mechanical properties that bainite ductile iron has makes it have purposes very widely, as is used in wear-resisting, shock-resistant, HS, H.T. and fatigue proof occasion.Have broad application prospects at abrasion resistant part such as liner plate, mill section, tup, baseball, bar etc.
Bainite ductile iron has three kinds of working methods.The one, isothermal quenching technique.This technology is at first carried out austenitizing with magnesium iron, is incubated reasonable time in the salt bath of the certain temperature of quenching rapidly then, and the air cooling of coming out of the stove subsequently is to room temperature.This technology power consumption of this technology, consuming time serious also has all restrictions to casting dimension size and shape.The 2nd, continuous Cooling Quenching technology.This technology is that the foundry goods after the high temperature austeniteization is quenched in the specific quenchant immediately, obtains the working method of Ao-Bei tissue through cooling continuously.This technology is fit to the less demanding bainite ductile iron foundry goods of performance.The 3rd, alloying as cast condition technology.This processing requirement foundry goods is avoided the perlitic transformation nose temperature in process of cooling, in case be transformed into perlite, can pass through the bainite district continuously again then, makes it to form bainite.Usually the alloying element that adds has the 0 % molybdenum of the 0 % nickel of 3. 0 %～4. and 0. 6 %～1. etc.This technology adds a large amount of alloying elements, and production cost is high.
Summary of the invention
What the object of the invention utilized niobium alloy obtains bainite ductile iron through thermal treatment; What exploitation had a formedness price ratio contains the niobium bainite ductile iron; A kind of wear-resisting material of excellent properties is provided, is fit to the application of industrial circles such as metallurgy, mine, building materials, electric power.
The object of the invention is realized through following technical proposals.
1, a kind of niobium bainite ductile iron material that contains, its main chemical compositions (wt%): C3.5～3.8, Si2.4～2.8, Mn1.5～2.2, Mo0.2～0.5, Cu0.5～0.8, Nb0.2～0.6, surplus is Fe.Tissue signature is bainite+martensite+austenite+carbide and SG after bakingout process, and mechanical characteristics is HRC47～49, Ak13～15J/cm2.The niobium element strengthens stabilization of austenite, promotes the formation of bainite structure, and the ability thinning microstructure, improves the hardness and the impelling strength of material.
2, a kind of niobium bainite ductile iron production technique that contains comprises casting technique and thermal treatment process.
(1) casting technique
Adopting foundry iron, steel scrap, ferrosilicon, ferromanganese, molybdenum-iron, fine copper, ferro-niobium is starting material, (wt%) C3.5～3.8 by mass percentage, Si2.4～2.8; Mn1.5～2.2, Mo0.2～0.5, Cu0.5～0.8; Nb0.2～0.6, surplus are that Fe prepares burden, melting in medium-frequency induction furnace.Carry out chemical ingredients before coming out of the stove and detect, furnace charge is got the spectrum sample that an amount of iron liquid waters into φ 45 * 4mm at 1400 ℃ after all melting, and learns composition with spectrometer analysis with the liquefaction of adjustment iron.Tapping temperature is 1450～1500 ℃, and teeming temperature is 1400 ± 20 ℃.The method nodularization is poured in employing, and nodulizing agent is FeSiMg
8RE
7, consumption is 1.8wt%, and nodulizing agent is broken into fritter, puts into the pack processing bottom, on nodulizing agent, covers nucleating agent, perlite skim agent then, pours 1/2～2/3 iron liquid, when treating that the boiling of iron liquid finishes, pours all the other iron liquid again.Adding skim agent after disposing thoroughly skims.Adopt 75SiFe to breed, consumption is 1.0wt%, when spheroidizing, half the nucleating agent is covered on the nodulizing agent, and second half nucleating agent is put into when hot metal charging.
(2) thermal treatment process
Foundry goods is heated to 900 ℃ of austenitizings, insulation 3h, air cooling to 300 ℃ carries out middle temperature transformation, and insulation 2h, air cooling make it that bainite transformation take place to room temperature.For the not high foundry goods of performance requriements, can utilize afterheat in casting, at 900 ℃ of left and right sides high temperature knockouts, air cooling to 300 ℃ carries out middle temperature transformation.
Niobium forms limited solid solution in austenite, the stability of supercooled austenite is improved, thereby improve its hardening capacity.Niobium has the effect of breeding by force, simultaneously can promote nodularization, and grain refining, eutectic mass size are reduced, and diffusion length shortens when making the carbon precipitation, helps reducing the austenite carbon concentration, thus the forming core that helps bainite with grow up.Can also form the NbC disperse in matrix, effectively prevent slippage between crystallites in the flow of metal process, hinder the expansion of crackle.Therefore, come replacement nickel to produce bainite ductile iron with niobium, and utilize proper heat treatment technology, can reduce the cost of material.
Compare with the bainite ductile iron technology of generally using at present, in spheroidal graphite cast iron, add niobium alloy, the bainite ductile iron that thermal treatment obtains has excellent performance.Niobium strengthens stabilization of austenite, makes the reduction of bainite transformation temperature, prolongs the incubation period of bainite transformation, increases and changes condensate depression, promotes the formation of bainite structure, and the ability thinning microstructure, thereby improves the hardness and the impelling strength of material.Niobium changes C curve, the perlitic transformation curve is moved to right, thereby under the air cooling condition, avoid the perlite high temperature transformation at austenite structure, thereby saved heat treated cost.
Characteristics of the present invention: one utilize niobium alloying obtain bainite ductile iron, improve its hardening capacity thereby improve austenitic stability.Niobium forms limited solid solution in austenite, can also form NbC hard phase, improves the hardness of matrix.Niobium makes grain refining, thus the forming core that helps bainite with grow up.Two adopt air cooling to add the tempered thermal treatment process, and production technique is simple, and production cost is low.
Description of drawings
Fig. 1 is not for containing niobium bainite ductile iron tissue.
Fig. 2 is for containing niobium 0.25wt% bainite ductile iron tissue.
Embodiment
Be described in detail specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
Embodiment 1
Contain niobium bainite ductile iron material chemical composition (wt%): C3.6, Si2.5, Mn2.0, Mo0.3, Cu0.5, Nb0.25, surplus is Fe.In the medium-frequency induction furnace melting, carry out chemical ingredients before coming out of the stove and detect, furnace charge is got the spectrum sample that an amount of iron liquid waters into φ 45 * 4mm at 1400 ℃ after all melting, and learns composition with spectrometer analysis with the liquefaction of adjustment iron.Tapping temperature is 1500 ℃, and teeming temperature is 1400 ℃.
The method nodularization is poured in employing, and nodulizing agent is FeSiMg
8RE
7, consumption is 1.8wt%, and nodulizing agent is broken into fritter; Put into the pack processing bottom, on nodulizing agent, cover nucleating agent, perlite skim agent then, pour 1/2～2/3 iron liquid; When treating that the boiling of iron liquid finishes, pour all the other iron liquid again, add skim agent after disposing and thoroughly skim.
Adopt 75SiFe to breed, consumption is 1.0wt%, when spheroidizing, half the nucleating agent is covered on the nodulizing agent, and second half nucleating agent is put into when hot metal charging.
Foundry goods is through 900 ℃ of austenitizings, and insulation 3h, air cooling to 300 ℃ carry out middle temperature transformation, insulation 2h, and air cooling is to room temperature.Its tissue signature is bainite+martensite+austenite+carbide and SG, and mechanical characteristics is HRC48.3, Ak13.6J/cm2.Be characterized as HRC45.2 with the congruent mechanics of materials that does not contain niobium, Ak12.2J/cm2 compares, and hardness and impelling strength all increase.From the tissue contrast, shown in Fig. 1 and Fig. 2, behind the adding niobium, bainite structure increases, and structure refinement.
Claims (2)
1. one kind contains niobium bainite ductile iron material, it is characterized in that the chemical ingredients of this ductile iron material is: C3.5～3.8wt%, and Si2.4～2.8wt%, Mn1.5～2.2wt%, Mo0.2～0.5wt%, Cu0.5～0.8wt%, Nb0.2～0.6wt%, surplus is Fe; Tissue signature is bainite+martensite+austenite+carbide and SG after bakingout process, and mechanical property is HRC47～49, Ak13～15J/cm
2
2. production technique that contains niobium bainite ductile iron material is characterized in that this production technique has following technological process:
(1) casting technique
Melting technology: adopting foundry iron, steel scrap, ferrosilicon, ferromanganese, molybdenum-iron, fine copper, ferro-niobium is starting material, presses C3.5～3.8wt%, Si2.4～2.8wt%; Mn1.5～2.2wt%; Mo0.2～0.5wt%, Cu0.5～0.8wt%, Nb0.2～0.6wt%; Surplus is that Fe prepares burden, in the medium-frequency induction furnace melting; Carry out chemical ingredients before coming out of the stove and detect, furnace charge is got the spectrum sample that an amount of iron liquid waters into φ 45 * 4mm at 1400 ℃ after all melting, and learns composition with spectrometer analysis with the liquefaction of adjustment iron; Tapping temperature is 1450～1500 ℃, and teeming temperature is 1400 ± 20 ℃;
Spheriodizing technique: adopt and pour the method nodularization, nodulizing agent is FeSiMg8RE7, and consumption is 1.8wt%; Nodulizing agent is broken into fritter; Put into the pack processing bottom, on nodulizing agent, cover nucleating agent, perlite skim agent then, pour 1/2～2/3 iron liquid; When treating that the boiling of iron liquid finishes, pour all the other iron liquid again; Adding skim agent after disposing thoroughly skims;
Inoculated technology: adopt 75SiFe to breed, consumption is 1.0wt%, when spheroidizing, half the nucleating agent is covered on the nodulizing agent, and second half nucleating agent is put into when hot metal charging;
(2) thermal treatment process
Foundry goods is heated to 900 ℃ of austenitizings, insulation 3h, air cooling to 300 ℃ carries out middle temperature transformation, and insulation 2h, air cooling make it that bainite transformation take place to room temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752781A (en) * | 2013-12-02 | 2014-04-30 | 沈阳工业大学 | Casting process method for nodular cast iron casting used at ultralow temperature |
| CN104073713A (en) * | 2014-07-28 | 2014-10-01 | 宁国市南方耐磨材料有限公司 | Bainite ductile iron grinding ball |
| CN109706381A (en) * | 2019-03-05 | 2019-05-03 | 河南科技大学 | A kind of cylinder jacket cylinder iron material, cylinder jacket and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103752781A (en) * | 2013-12-02 | 2014-04-30 | 沈阳工业大学 | Casting process method for nodular cast iron casting used at ultralow temperature |
| CN104073713A (en) * | 2014-07-28 | 2014-10-01 | 宁国市南方耐磨材料有限公司 | Bainite ductile iron grinding ball |
| CN104073713B (en) * | 2014-07-28 | 2016-09-14 | 宁国市南方耐磨材料有限公司 | A kind of bainite ductile iron abrading-ball |
| CN109706381A (en) * | 2019-03-05 | 2019-05-03 | 河南科技大学 | A kind of cylinder jacket cylinder iron material, cylinder jacket and preparation method thereof |
| CN109706381B (en) * | 2019-03-05 | 2020-02-14 | 河南科技大学 | Cast iron material for cylinder liner, cylinder liner and preparation method of cylinder liner |
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| CN102330012B (en) | 2012-11-07 |
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