CN103382543A - Special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel and preparation method thereof - Google Patents
Special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel. The medium is mainly used for the die steel which is used at the high temperature and under high pressure, has a high requirement for surface hardness and is good in heat-resisting fatigability. The medium aims at improving the abrasion resistance, high temperature oxidation resistance and heat fatigue of a die. The surface performance of the die steel is improved by using the solid boron, carbon and nitrogen mutlicomponent diffusion process of 930 DEG C X 4h (RE-BNC diffusion)-1020 DEG C X 30min (quenching)-600 DEG C X 30 min (tempering)-550 DEG C X 4h (RE-NC diffusion twice)-180 DEG C X 4h (tempering).
Description
Technical field
The present invention relates to a kind of multicomponent diffusion medium, be specifically related to a kind of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium, the invention still further relates to the preparation method of this diffusion medium.
Background technology
The H13 steel is the material that is usually used in making magnesium alloy die casting mould, is used widely in modern industry.Mould is directly connected to quality, performance, productivity and the cost of product, and the steel of the quality of mould and work-ing life and mfg. moulding die and technique have direct relation.Die casting is that a kind of high benefit, high-level efficiency are without the cutting metal heat processing and forming method.At present, diecast parts is widely used in many products of each industrial sector.Due to the principle of work of Die Casting-in press casting procedure, transfer mold directly contacts with high temperature, high pressure, at a high speed molten metal, and it will be subject to directly the washing away of molten metal, wearing and tearing, high temperature oxidation and various corrosion one side; On the other hand due to the high-level efficiency of producing, temperature rising and the decline of mould are very fierce, and the periodic variation of formation, cause transfer mold work under rugged environment extremely, easily producing thermal fatigue and Erosion lost efficacy, for above-mentioned reasons, require the transfer mold surface to have good use properties and processing performance.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium, is mainly used in the die steel that uses under high temperature, high pressure, and surface hardness is had relatively high expectations, thermal fatigue resistance is better; Purpose is to improve wear resistance, high temperature oxidation resistance, the thermal fatigue of mould.
A kind of die steel rare earth special boron provided by the invention, carbon, nitrogen multicomponent diffusion medium, the carbonated rare earth of employing 15% is urged oozing and can be improved alloying layer thickness and surface structure performance, by adopting boron carbonitriding (RE-BNC), twice carbonitriding (RE-NC), improve the surface property of die steel.
The present invention realizes by the following technical solutions:
A kind of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium comprise penetration enhancer and energizer, and it is characterized in that: penetration enhancer comprises charcoal, gac, urea, Borax pentahydrate; Energizer comprises sodium carbonate, ammonium chloride, carbonated rare earth mixture, aluminium powder.
Further, described carbonated rare earth mixture comprises:
La
2(CO
3)
3-1 45-65%，
Ce
2(CO
3)
3-01 35-55%；
Wherein: rare earth La
2(CO
3)
3-1 composition is: TREO is not less than 45
La
2O
3/ REO is not less than 99
Rare earth impurities/REO is not less than 1.0
Rare-Earth Ce
2(CO
3)
3-01 composition is: TREO is not less than 45
CeO
2/ REO is not less than 99
Rare earth impurities/REO is not less than 1.0
TREO is total amount of the rare earth oxide, and REO is rare earth oxide.
The preparation method of a kind of die steel rare earth special boron provided by the invention, carbon, nitrogen multicomponent diffusion medium is characterized in that: comprise the following steps:
The first step: boron carbonitriding: comprise that high temperature oozes altogether: 930 ℃ * 4h (RE-BNC oozes altogether) → 1020 ℃ * 20min(quenches) → 600 ℃ * 30min(tempering);
The proportioning in this stage: the mixture of 20-30% charcoal and gac
20-30% urea
The 20-30% borax
6-8% sodium carbonate
10-20% carbonated rare earth mixture
1-2% ammonium chloride
The 1-2% aluminium powder
Concrete operation steps is:
(1) penetration enhancer is ground into the particle of 1-2mm, stirs in agitator, then vanning;
(2) before the workpiece vanning, clear up surface and oil contaminant with clean-out system, reusable heat water cleans workpiece surface, dry;
(3) penetration enhancer is paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
(4) workpiece is placed on the casing middle part, during the carrying workpiece, can not directly contact workpiece surface with hand, prevents the workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are not less than 20mm;
(5) the workpiece top with penetration enhancer cover, compacting, workpiece and case lid spacing are not less than 40mm, but can not be gapped between case lid and penetration enhancer, after must filling up compacting, the ability capping;
(6) rate of heating is controlled at 80-100 ℃/h, soaking time: 5 min/mm(workpiece net thickness);
(7) during workpiece quenching, workpiece is taken out in case fast, minimum quenching temperature is not less than 980 ℃, is cooled to 80-100 ℃, tempering immediately;
(8) during tempering, rate of heating is controlled at 60-80 ℃/h, 600 ℃ of insulation 30min, furnace cooling.
Second step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling;
The proportioning in this stage: the mixture of 30-40% charcoal and gac
35-45% urea
3-4% sodium carbonate
1-2% ammonium chloride
10-20% carbonated rare earth mixture
Concrete operation steps is:
When (1) low temperature oozes altogether, the remaining penetration enhancer of cleaning workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, the workpiece air cooling;
The 3rd step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling → tempering: 180 ℃ * 4h;
The proportioning in this stage: the mixture of 35-45% charcoal and gac
45-55% urea
3-4% sodium carbonate
1-2% ammonium chloride
4-6% carbonated rare earth mixture
Concrete operation steps is:
When (1) low temperature oozes altogether, will clear up the remaining penetration enhancer of workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, the workpiece air cooling;
(4) the workpiece air cooling to room temperature, carries out 180 ℃ of low-temperaturetemperings, and rate of heating is controlled at 50-60 ℃/h, soaking time: 5 min/mm(workpiece net thickness), cool to room temperature with the furnace, confusion technology is completed.
The mixture of described charcoal and gac comprises: charcoal content is 80-95%, and gac content is 5-20%.
Further, in described vanning process, require workpiece to put spacing to be: the spacing at the bottom of workpiece and case is 30～40mm, and the spacing of workpiece and tank wall is 20～30mm, and the spacing of workpiece and workpiece is 10～15mm, and the spacing of workpiece and case lid is 40～50mm.The concrete operation step of workpiece vanning is:
Before A, workpiece vanning, clear up surface and oil contaminant with clean-out system, reusable heat water cleans workpiece surface, dry;
B, penetration enhancer are paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
C, workpiece are placed on the casing middle part, during the carrying workpiece, can not directly contact workpiece surface with hand, prevent the workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are not less than 20mm;
D, workpiece top with penetration enhancer cover, compacting, workpiece and case lid spacing are not less than 40mm, but can not be gapped between case lid and penetration enhancer, after must filling up compacting, the ability capping;
The refractory mortar sealed platform cover of E, use grog dries.
the present invention adopts 15% carbonated rare earth to urge oozing can improve alloying layer thickness and surface structure performance, its principle is: 1, on the steel surface, work as nitrogen, carbon atom is in austenite during distribution gradient, rising along with Heating temperature, nitrogen, carbon atom is to internal divergence, can impel the equidirectional movement of boron atom, accelerated boriding rate, at solid boron carbonitriding: 930 ℃ * 4h (rare earth-boron carbonitriding)-1020 ℃ * 30min (quenching)-600 ℃ * 30min (tempering)-550 ℃ * twice of 4h(rare earth carbonitriding)-180 ℃ * the 4h(tempering) make co-penetration layer be increased to 90-120 μ m by 40 μ m under processing condition, 2, compound layer thickness reaches 90～120 μ m after adding 15% carbonated rare earth compound, and thickness has increased by 1 times, illustrates that appropriate carbonated rare earth urges that to ooze effect better, 3, the infiltration of rare earth element effectively prevents the formation of soft zone, makes surface hardness be increased to HV1100-1300 from HV980, and the sample that does not add RE co-permeating is being organized hardness HV441 apart from the position of surface 60～90 μ m, and soft zone has appearred in matrix HV538, 4, the infiltration of rare earth, not only improve the thickness of co-penetration layer, and improved hardness and the degree of depth of transition layer, strengthened contacting of matrix and co-penetration layer, for co-penetration layer provides strong support, surface hardness is by making wear rate be reduced to 0.025-0.03mg/min by 0.054mg/min, 5, by determination of hardness before and after 700 ℃ of thermal fatigue tests, the infiltration that rare earth element is described effectively improves surface compress residual stresses, and suppresses the release of residual compressive stress, after carrying out thermal fatigue test 2000 times under 700 ℃ of conditions, the specimen surface crackle changes less, piece do not occur falling.
Technological process of the present invention is: 930 ℃ * 4h (RE-BNC oozes altogether)-1020 ℃ * 30min (quenching)-600 ℃ * 30min (tempering)-550 ℃ * 4h(RE-NC oozes twice altogether)-180 ℃ * the 4h(tempering); Adding of rare earth compound, can accelerate the permeating speed of BNC, significantly improve the thickness of infiltration layer; High temperature (930 ℃ * 4h) BNC oozes rear quenching, tempering altogether, obtain obdurability matrix and hardness higher surface preferably, because such matrix has higher resistance to deformation, provide good support to boride layer simultaneously, so greatly reduce the possibility that Brittleness destroys; Low temperature (550 ℃ * when 4h) NC oozes altogether, the a little higher than nitrogen-atoms of the velocity of diffusion of carbon atom in a iron, but the solid solubility of carbon atom in a iron due to the interaction of nitrogen-atoms and carbon atom, is greatly improved carbonitriding speed lower than the solid solubility of nitrogen-atoms.
In the present invention, after the ammonium chloride usage quantity surpassed 2%, the vestige of corrosion appearred in specimen surface.Therefore, in preparation method of the present invention, the consumption of ammonium chloride is controlled at 1-2%.
The infiltration of rare earth element has obviously alleviated the tectorium that the Ke Kendaer effect produces.
Beneficial effect of the present invention:
⑴ floride-free compound in diffusion medium, in the minimizing use procedure, fluorochemical is to operator's injury and the pollution of environment.
⑵ replace rare earth chloride with carbonated rare earth, and in the minimizing use procedure, the muriate fluorochemical is to operator's injury and the pollution of environment.
⑶ co-penetration layer thickness is at 90-120 μ m, and surface hardness is between HV1100-1300, and the infiltration of rare earth element has obviously alleviated the tectorium that the Ke Kendaer effect produces.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment 1: the preparation method of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium
The present embodiment comprises the following steps:
The first step: boron carbonitriding: comprise that high temperature oozes altogether: 930 ℃ * 4h (RE-BNC oozes altogether) → 1020 ℃ * 20min(quenches) → 600 ℃ * 30min(tempering);
The proportioning in this stage: the mixture of 20kg charcoal and gac
8kg sodium carbonate
20kg carbonated rare earth mixture
20kg urea
1kg ammonium chloride
The 30kg borax
The 1kg aluminium powder
Wherein the mixture of charcoal and gac is: charcoal 16kg, gac 4kg; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-19 kilogram, Ce
2(CO
3)
3-01 11 kilogram;
Concrete operation steps is:
(1) penetration enhancer is ground into the particle of 1-2mm, stirs in agitator, then vanning;
(2) before the workpiece vanning, clear up surface and oil contaminant with clean-out system, reusable heat water cleans workpiece surface, dry;
(3) penetration enhancer is paved with bottom half, compacting, and penetration enhancer thickness is 35mm;
(4) workpiece is placed on the casing middle part, during the carrying workpiece, can not directly contact workpiece surface with hand, prevents the workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are 25mm;
(5) the workpiece top with penetration enhancer cover, compacting, workpiece and case lid spacing are 45mm, but can not be gapped between case lid and penetration enhancer, after must filling up compacting, the ability capping;
(6) rate of heating is controlled at 80-100 ℃/h, soaking time: 5mm/min(workpiece net thickness);
(7) during workpiece quenching, workpiece is taken out in case fast, minimum quenching temperature is not less than 980 ℃, is cooled to 80-100 ℃, tempering immediately;
(8) during tempering, rate of heating is controlled at 60-80 ℃/h, 600 ℃ of insulation 30min, furnace cooling.
Second step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling;
The proportioning in this stage: the mixture of 30kg charcoal and gac
4kg sodium carbonate
45kg urea
1kg ammonium chloride
20kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 26 kilograms, charcoal, 4 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 10 kilogram, Ce
2(CO
3)
3-01 10 kilogram;
Concrete operation steps is:
When (1) low temperature oozes altogether, the remaining penetration enhancer of cleaning workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, and soaking time: 5mm/min(workpiece net thickness), and after coming out of the stove, the workpiece air cooling;
The 3rd step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling → tempering: 180 ℃ * 4h;
The proportioning in this stage: the mixture of 35kg charcoal and gac
4kg sodium carbonate
55kg urea
2kg ammonium chloride
4kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 30 kilograms, charcoal, 5 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 2.4 kilogram, Ce
2(CO
3)
3-01 1.6 kilogram;
Concrete operation steps is:
When (1) low temperature oozes altogether, will clear up the remaining penetration enhancer of workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, the workpiece air cooling;
(4) the workpiece air cooling to room temperature, carries out 180 ℃ of low-temperaturetemperings, and rate of heating is controlled at 50-60 ℃/h, soaking time: 5 min/mm(workpiece net thickness), cool to room temperature with the furnace, confusion technology is completed.
Co-penetration layer thickness is at 108-115 μ m, and surface hardness is HV1180.
Embodiment 2: the preparation method of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium
The present embodiment preparation method is identical with embodiment 1.
Proportioning raw materials is as follows
:
The first step: boron carbonitriding:
The mixture of 30kg charcoal and gac
6kg sodium carbonate
10kg carbonated rare earth mixture
30kg urea
2kg ammonium chloride
The 20kg borax
The 2kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 27 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 5.6 kilogram, Ce
2(CO
3)
3-01 4.4 kilogram;
Second step: carbonitriding
The mixture of 35kg charcoal and gac
3kg sodium carbonate
40kg urea
2kg ammonium chloride
20kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 32 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 9.5 kilogram, Ce
2(CO
3)
3-01 10.5 kilogram;
The 3rd step: carbonitriding
The mixture of 45kg charcoal and gac
3kg sodium carbonate
45kg urea
1kg ammonium chloride
6kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 42 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 3.6 kilogram, Ce
2(CO
3)
3-01 2.4 kilogram;
Co-penetration layer thickness is at 92-96 μ m, and surface hardness is at HV1170.
Embodiment 3: the preparation method of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium
The present embodiment preparation method is identical with embodiment 1.
Proportioning raw materials is as follows:
The first step: boron carbonitriding
The mixture of 25kg charcoal and gac
7kg sodium carbonate
15kg carbonated rare earth mixture
25kg urea
1.5kg ammonium chloride
The 25kg borax
1.5kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 22.5 kilograms, charcoal, 2.5 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-18 kilogram, Ce
2(CO
3)
3-01 7 kilogram;
Second step: carbonitriding
The mixture of 33kg charcoal and gac
3kg sodium carbonate
45kg urea
1kg ammonium chloride
18kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 30 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 11 kilogram, Ce
2(CO
3)
3-01 7 kilogram;
The 3rd step: carbonitriding
The mixture of 41kg charcoal and gac
3kg sodium carbonate
50kg urea
1kg ammonium chloride
5kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 35 kilograms, charcoal, 6 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-13 kilogram, Ce
2(CO
3)
3-01 2 kilogram; (providing concrete proportional quantity)
Co-penetration layer thickness is at 100-105 μ m, and surface hardness is at HV1210.
Embodiment 4: the preparation method of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium
The present embodiment preparation method is identical with embodiment 1.
Proportioning raw materials is as follows
:
The first step: boron carbonitriding:
The mixture of 30kg charcoal and gac
7.2kg sodium carbonate
10kg carbonated rare earth mixture
27kg urea
2kg ammonium chloride
The 22kg borax
1.8kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 27 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 4.6 kilogram, Ce
2(CO
3)
3-01 5.4 kilogram;
Second step: carbonitriding
The mixture of 38kg charcoal and gac
3kg sodium carbonate
39kg urea
2kg ammonium chloride
18kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 35 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 8.5 kilogram, Ce
2(CO
3)
3-01 9.5 kilogram;
The 3rd step: carbonitriding
The mixture of 42kg charcoal and gac
3kg sodium carbonate
48kg urea
1kg ammonium chloride
6kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 39 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-13 kilogram, Ce
2(CO
3)
3-01 3 kilogram;
Co-penetration layer thickness is at 92-98 μ m, and surface hardness is HV1150.
Embodiment 5: the preparation method of die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium
The present embodiment preparation method is identical with embodiment 1.
Proportioning raw materials is as follows
:
The first step: boron carbonitriding:
The mixture of 28kg charcoal and gac
6kg sodium carbonate
10kg carbonated rare earth mixture
26kg urea
2kg ammonium chloride
26.2kg borax
1.8kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 25 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 4.6 kilogram, Ce
2(CO
3)
3-01 5.4 kilogram;
Second step: carbonitriding
The mixture of 32kg charcoal and gac
3kg sodium carbonate
40kg urea
1.6kg ammonium chloride
17kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 29 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-18 kilogram, Ce
2(CO
3)
3-01 9 kilogram;
The 3rd step: carbonitriding
The mixture of 35kg charcoal and gac
3kg sodium carbonate
45kg urea
1kg ammonium chloride
5kg carbonated rare earth mixture
Wherein the mixture of charcoal and gac comprises: 32 kilograms, charcoal, 3 kilograms of gacs; Wherein the carbonated rare earth mixture comprises: La
2(CO
3)
3-1 2.6 kilogram, Ce
2(CO
3)
3-01 2.4 kilogram;
Co-penetration layer thickness is at 98-102 μ m, and surface hardness is HV1280.
Claims (5)
1. a die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium, comprise penetration enhancer and energizer, and it is characterized in that: penetration enhancer comprises charcoal, gac, urea, Borax pentahydrate; Energizer comprises sodium carbonate, ammonium chloride, carbonated rare earth mixture, aluminium powder.
2. die steel rare earth special boron according to claim 1, carbon, nitrogen multicomponent diffusion medium, it is characterized in that: described carbonated rare earth mixture comprises:
La
2(CO
3)
3-1 45-65%，
Ce
2(CO
3)
3-01 35-55%；
Wherein: rare earth La
2(CO
3)
3-1 composition is: TREO is not less than 45
La
2O
3/ REO is not less than 99
Rare earth impurities/REO is not less than 1.0
Rare-Earth Ce
2(CO
3)
3-01 composition is: TREO is not less than 45
CeO
2/ REO is not less than 99
Rare earth impurities/REO is not less than 1.0
TREO is total amount of the rare earth oxide, and REO is rare earth oxide.
3. the preparation method of a die steel rare earth special boron, carbon, nitrogen multicomponent diffusion medium is characterized in that: comprise the following steps:
The first step: boron carbonitriding: comprise that high temperature oozes altogether: 930 ℃ * 4h (RE-BNC oozes altogether) → 1020 ℃ * 20min(quenches) → 600 ℃ * 30min(tempering);
The proportioning in this stage: the mixture of 20-30% charcoal and gac
20-30% urea
The 20-30% borax
6-8% sodium carbonate
10-20% carbonated rare earth mixture
1-2% ammonium chloride
The 1-2% aluminium powder
Concrete operation steps is:
(1) penetration enhancer is ground into the particle of 1-2mm, stirs in agitator, then vanning;
(2) before the workpiece vanning, clear up surface and oil contaminant with clean-out system, reusable heat water cleans workpiece surface, dry;
(3) penetration enhancer is paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
(4) workpiece is placed on the casing middle part, during the carrying workpiece, can not directly contact workpiece surface with hand, prevents the workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are not less than 20mm;
(5) the workpiece top with penetration enhancer cover, compacting, workpiece and case lid spacing are not less than 40mm, but can not be gapped between case lid and penetration enhancer, after must filling up compacting, the ability capping;
(6) rate of heating is controlled at 80-100 ℃/h, soaking time: 5 min/mm;
(7) during workpiece quenching, workpiece is taken out in case fast, minimum quenching temperature is not less than 980 ℃, is cooled to 80-100 ℃, tempering immediately;
(8) during tempering, rate of heating is controlled at 60-80 ℃/h, 600 ℃ of insulation 30min, furnace cooling;
Second step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling;
The proportioning in this stage: the mixture of 30-40% charcoal and gac
35-45% urea
3-4% sodium carbonate
1-2% ammonium chloride
10-20% carbonated rare earth mixture
Concrete operation steps is:
When (1) low temperature oozes altogether, the remaining penetration enhancer of cleaning workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, and soaking time: 5 min/mm, after coming out of the stove, the workpiece air cooling;
The 3rd step: carbonitriding: comprise that low temperature oozes altogether: 550 ℃ * 4h → furnace cooling → tempering: 180 ℃ * 4h;
The proportioning in this stage: the mixture of 35-45% charcoal and gac
45-55% urea
3-4% sodium carbonate
1-2% ammonium chloride
4-6% carbonated rare earth mixture
Concrete operation steps is:
When (1) low temperature oozes altogether, will clear up the remaining penetration enhancer of workpiece surface, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter stirs in agitator at 1-2mm, then vanning; The vanning process is by (2) ~ (5) operation in the first step;
(3) rate of heating is controlled at 80-100 ℃/h, 550 ℃ of insulations, and soaking time: 5 min/mm, after coming out of the stove, the workpiece air cooling;
(4) the workpiece air cooling to room temperature, carries out 180 ℃ of low-temperaturetemperings, and rate of heating is controlled at 50-60 ℃/h, soaking time: 5 min/mm, cool to room temperature with the furnace, and confusion technology is completed.
4. the preparation method of die steel rare earth special boron according to claim 3, carbon, nitrogen multicomponent diffusion medium, it is characterized in that: the mixture of described charcoal and gac comprises: charcoal content is 80-95%, gac content is 5-20%.
5. the preparation method of die steel rare earth special boron according to claim 3, carbon, nitrogen multicomponent diffusion medium, it is characterized in that: in described vanning process, the requirement workpiece is put spacing and is: the spacing at the bottom of workpiece and case is 30～40mm, the spacing of workpiece and tank wall is 20～30mm, the spacing of workpiece and workpiece is 10～15mm, and the spacing of workpiece and case lid is 40～50mm.
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|---|---|---|---|
| CN201310318774.4A CN103382543B (en) | 2013-07-26 | 2013-07-26 | Special rare earth boron, carbon and nitrogen multicomponent diffusion medium for die steel and preparation method thereof |
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| CN103866333A (en) * | 2014-03-05 | 2014-06-18 | 辽宁工业大学 | Nitrocarburizing process of Cr12MoV steel |
| CN104531963A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Process for spheroidizing and annealing die steel |
| CN105002339A (en) * | 2015-07-23 | 2015-10-28 | 柳州市众力金铭热处理有限公司 | Method for improving wear resistance of 65 Mn steel rod for quartz sand rod mill |
| CN105039904A (en) * | 2015-06-04 | 2015-11-11 | 刘永春 | Chromium-titanium-nitrogen-carbon multicomponent diffusion medium and co-diffusion method thereof |
| CN106591774A (en) * | 2016-12-31 | 2017-04-26 | 马鞍山市三江机械有限公司 | Multiplex heat treatment process of H13 die steel |
| CN108405646A (en) * | 2018-03-19 | 2018-08-17 | 福建奋安铝业有限公司 | A kind of extruding die for aluminum shaped material and its processing technology |
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| CN103866333A (en) * | 2014-03-05 | 2014-06-18 | 辽宁工业大学 | Nitrocarburizing process of Cr12MoV steel |
| CN104531963A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Process for spheroidizing and annealing die steel |
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| CN106591774A (en) * | 2016-12-31 | 2017-04-26 | 马鞍山市三江机械有限公司 | Multiplex heat treatment process of H13 die steel |
| CN106591774B (en) * | 2016-12-31 | 2019-05-24 | 马鞍山市三江机械有限公司 | A kind of composite heat treating process of H13 mold steel cutter |
| CN108405646A (en) * | 2018-03-19 | 2018-08-17 | 福建奋安铝业有限公司 | A kind of extruding die for aluminum shaped material and its processing technology |
| CN113005394A (en) * | 2021-02-22 | 2021-06-22 | 山东农业大学 | J55 steel pipe processing method based on rare earth catalytic carbonitriding |
| CN115125477A (en) * | 2022-06-29 | 2022-09-30 | 常州铂林热处理有限公司 | Composite nitriding heat treatment process |
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