CN103382543B - 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
H13 steel is the material being usually used in manufacturing magnesium alloy die casting mould, is used widely in modern industry.Mould is directly connected to the quality of product, performance, productivity and cost, 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 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-in press casting procedure of Die Casting, transfer mold directly contacts with high temperature, high pressure, molten metal at a high speed, one side it to be subject to directly the washing away of molten metal, wear and tear, high temperature oxidation and various corrosion; High-level efficiency on the other hand owing to producing, the temperature of mould raise and decline very fierce, and form periodically change, transfer mold is caused to be operated in extremely under rugged environment, easy generation thermal fatigue and Erosion lost efficacy, for above-mentioned reasons, require that transfer mold surface has 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 used under high temperature, high pressure, and surface hardness requirement is higher, thermal fatigue resistance is better; Object improves 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 15% is adopted to carry out urging oozing and can improve 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, 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 high temperature and ooze altogether: 930 DEG C × 4h (RE-BNC oozes altogether) → 1020 DEG C × 20min(quenching) → 600 DEG C × 30min(tempering);
The proportioning in this stage: the mixture of 20-30% charcoal and gac
20-30% urea
20-30% borax
6-8% sodium carbonate
10-20% carbonated rare earth mixture
1-2% ammonium chloride
1-2% aluminium powder
Concrete operation steps is:
(1) penetration enhancer is ground into the particle of 1-2mm, stirs in agitator, then cases;
(2), before workpiece vanning, clear up surface and oil contaminant with clean-out system, workpiece surface cleans by reusable heat water, dry;
(3) penetration enhancer is paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
(4) workpiece is placed on casing middle part, carrying workpiece time, directly can not contact workpiece surface with hand, prevent workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are not less than 20mm;
(5) workpiece top penetration enhancer covering, compacting, workpiece and case lid spacing are not less than 40mm, but can not have gap between case lid and penetration enhancer, after must compacting being filled up, ability capping;
(6) rate of heating controls at 80-100 DEG C/h, soaking time: 5 min/mm(workpiece net thickness);
(7) during workpiece quenching, taken out fast by workpiece in case, minimum quenching temperature is not less than 980 DEG C, is cooled to 80-100 DEG C, immediately tempering;
(8) during tempering, rate of heating controls at 60-80 DEG C/h, 600 DEG C of insulation 30min, furnace cooling.
Second step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 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:
(1) when low temperature oozes altogether, cleaning workpiece surface residual penetration enhancer, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, workpiece air cooling;
3rd step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 4h → furnace cooling → tempering: 180 DEG C × 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:
(1), when low temperature oozes altogether, workpiece surface residual penetration enhancer, wipe oil will be cleared up;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, workpiece air cooling;
(4) after workpiece air cooling to room temperature, carry out 180 DEG C of low-temperaturetemperings, rate of heating controls at 50-60 DEG C/h, soaking time: 5 min/mm(workpiece net thickness), cool to room temperature with the furnace, confusion technology completes.
The mixture of described charcoal and gac comprises: charcoal content is 80-95%, and activated carbon content is 5-20%.
Further, in described binning process, require that workpiece is put spacing and is: workpiece and the spacing at the bottom of case are 30 ~ 40mm, 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 the vanning of A, workpiece, clear up surface and oil contaminant with clean-out system, workpiece surface cleans by reusable heat water, dry;
B, penetration enhancer are paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
C, workpiece are placed on casing middle part, carrying workpiece time, directly can not contact workpiece surface with hand, prevent 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 penetration enhancer cover, compacting, and workpiece and case lid spacing are not less than 40mm, but can not have gap between case lid and penetration enhancer, after must compacting being filled up, and ability capping;
The refractory mortar sealed platform cover of E, use grog, dries.
The present invention adopts the carbonated rare earth of 15% to carry out urging oozing and can improve alloying layer thickness and surface structure performance, its principle is: 1, on steel surface, work as nitrogen, carbon atom is in austenite during distribution gradient, along with the rising of Heating temperature, nitrogen, carbon atom internally spreads, the equidirectional movement of boron atom can be impelled, accelerate boriding rate, at solid boron carbonitriding: 930 DEG C × 4h (rare earth-boron carbonitriding)-1020 DEG C × 30min (quenching)-600 DEG C × 30min (tempering)-550 DEG C × 4h(rare earth carbonitriding twice)-180 DEG C × 4h(tempering) make co-penetration layer be increased to 90-120 μm by 40 μm under processing condition, 2, after adding the carbonated rare earth compound of 15%, compound layer thickness reaches 90 ~ 120 μm, and thickness adds 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 in soft ribbons district, makes surface hardness be increased to HV1100-1300 from HV980, and the sample not adding RE co-permeating is organizing hardness HV441 apart from the position on 60 ~ 90 μm, surface, and matrix HV538, there is soft ribbons district, 4, the infiltration of rare earth, not only increase the thickness of co-penetration layer, and improve hardness and the degree of depth of transition layer, enhance contacting of matrix and co-penetration layer, for co-penetration layer provides strong support, surface hardness is reduced to 0.025-0.03mg/min by making wear rate by 0.054mg/min, 5, by the mensuration of hardness before and after 700 DEG C of thermal fatigue tests, illustrate that the infiltration of rare earth element effectively improves surface compress residual stresses, and suppress the release of residual compressive stress, after carrying out thermal fatigue test 2000 times under 700 DEG C of conditions, the change of specimen surface crackle is less, does not occur falling block.
Technological process of the present invention is: 930 DEG C × 4h (RE-BNC oozes altogether)-1020 DEG C × 30min (quenching)-600 DEG C × 30min (tempering)-550 DEG C × 4h(RE-NC oozes twice altogether)-180 DEG C × 4h(tempering); Adding of rare earth compound, the permeating speed of BNC can be accelerated, significantly improve the thickness of infiltration layer; Rear quenching, tempering is oozed altogether at high temperature (930 DEG C × 4h) BNC, obtain the good matrix of obdurability and the higher surface of hardness, because such matrix has higher resistance to deformation, provide good support to boride layer, so greatly reduce the possibility of Brittleness destruction simultaneously; When low temperature (550 DEG C × 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 is lower than the solid solubility of nitrogen-atoms, due to the interaction of nitrogen-atoms and carbon atom, carbonitriding speed is greatly improved.
In the present invention, ammonium chloride usage quantity more than 2% after, specimen surface occur corrosion vestige.Therefore, in preparation method of the present invention, the consumption of ammonium chloride controls at 1-2%.
The infiltration of rare earth element obviously alleviates the tectorium of Ke Kendaer effect generation.
Beneficial effect of the present invention:
(1) floride-free compound in diffusion medium, reduces the injury of fluorochemical to operator and the pollution of environment in use procedure.
(2) replace rare earth chloride with carbonated rare earth, reduce the injury of muriate fluorochemical to operator and the pollution of environment in use procedure.
(3) co-penetration layer thickness is at 90-120 μm, and surface hardness is between HV1100-1300, and the infiltration of rare earth element obviously alleviates the tectorium of Ke Kendaer effect generation.
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 high temperature and ooze altogether: 930 DEG C × 4h (RE-BNC oozes altogether) → 1020 DEG C × 20min(quenching) → 600 DEG C × 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
30kg borax
1kg aluminium powder
Wherein the mixture of charcoal and gac is: charcoal 16kg, gac 4kg; Wherein 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 cases;
(2), before workpiece vanning, clear up surface and oil contaminant with clean-out system, workpiece surface cleans by reusable heat water, dry;
(3) penetration enhancer is paved with bottom half, compacting, and penetration enhancer thickness is 35mm;
(4) workpiece is placed on casing middle part, carrying workpiece time, directly can not contact workpiece surface with hand, prevent workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are 25mm;
(5) workpiece top penetration enhancer covering, compacting, workpiece and case lid spacing are 45mm, but can not have gap between case lid and penetration enhancer, after must compacting being filled up, ability capping;
(6) rate of heating controls at 80-100 DEG C/h, soaking time: 5mm/min(workpiece net thickness);
(7) during workpiece quenching, taken out fast by workpiece in case, minimum quenching temperature is not less than 980 DEG C, is cooled to 80-100 DEG C, immediately tempering;
(8) during tempering, rate of heating controls at 60-80 DEG C/h, 600 DEG C of insulation 30min, furnace cooling.
Second step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 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, gac 4 kilograms; Wherein 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:
(1) when low temperature oozes altogether, cleaning workpiece surface residual penetration enhancer, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5mm/min(workpiece net thickness), after coming out of the stove, workpiece air cooling;
3rd step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 4h → furnace cooling → tempering: 180 DEG C × 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, gac 5 kilograms; Wherein 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:
(1), when low temperature oozes altogether, workpiece surface residual penetration enhancer, wipe oil will be cleared up;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5 min/mm(workpiece net thickness), after coming out of the stove, workpiece air cooling;
(4) after workpiece air cooling to room temperature, carry out 180 DEG C of low-temperaturetemperings, rate of heating controls at 50-60 DEG C/h, soaking time: 5 min/mm(workpiece net thickness), cool to room temperature with the furnace, confusion technology completes.
Co-penetration layer thickness is at 108-115 μm, 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
20kg borax
2kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 27 kilograms, charcoal, gac 3 kilograms; Wherein 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, gac 3 kilograms; Wherein carbonated rare earth mixture comprises: La
2(CO
3)
3-1 9.5 kilogram, Ce
2(CO
3)
3-01 10.5 kilogram;
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, gac 3 kilograms; Wherein 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 μm, 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
25kg borax
1.5kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 22.5 kilograms, charcoal, gac 2.5 kilograms; Wherein 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, gac 3 kilograms; Wherein carbonated rare earth mixture comprises: La
2(CO
3)
3-1 11 kilogram, Ce
2(CO
3)
3-01 7 kilogram;
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, gac 6 kilograms; Wherein 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 μm, 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
22kg borax
1.8kg aluminium powder
Wherein the mixture of charcoal and gac comprises: 27 kilograms, charcoal, gac 3 kilograms; Wherein 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, gac 3 kilograms; Wherein carbonated rare earth mixture comprises: La
2(CO
3)
3-1 8.5 kilogram, Ce
2(CO
3)
3-01 9.5 kilogram;
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, gac 3 kilograms; Wherein 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 μm, 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, gac 3 kilograms; Wherein 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, gac 3 kilograms; Wherein carbonated rare earth mixture comprises: La
2(CO
3)
3-18 kilogram, Ce
2(CO
3)
3-01 9 kilogram;
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, gac 3 kilograms; Wherein 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 μm, and surface hardness is HV1280.
Claims (1)
1. die steel rare earth special boron, carbon, a nitrogen multicomponent diffusion medium, comprise penetration enhancer and energizer, and penetration enhancer comprises charcoal, gac, urea, Borax pentahydrate; Energizer comprises sodium carbonate, ammonium chloride, carbonated rare earth mixture, aluminium powder, 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.
2.a preparation method for 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 high temperature and ooze altogether: 930 DEG C × 4h RE-BNC oozes → 1020 DEG C × 20min quenching → 600 DEG C × 30min tempering altogether;
The proportioning in this stage: the mixture of 20-30% charcoal and gac
20-30% urea
20-30% borax
6-8% sodium carbonate
10-20% carbonated rare earth mixture
1-2% ammonium chloride
1-2% aluminium powder
Concrete operation steps is:
(1) penetration enhancer is ground into the particle of 1-2mm, stirs in agitator, then cases;
(2), before workpiece vanning, clear up surface and oil contaminant with clean-out system, workpiece surface cleans by reusable heat water, dry;
(3) penetration enhancer is paved with bottom half, compacting, penetration enhancer thickness 30-40mm;
(4) workpiece is placed on casing middle part, carrying workpiece time, directly can not contact workpiece surface with hand, prevent workpiece surface secondary pollution, around workpiece with penetration enhancer fill up, compacting, workpiece and tank wall spacing are not less than 20mm;
(5) workpiece top penetration enhancer covering, compacting, workpiece and case lid spacing are not less than 40mm, but can not have gap between case lid and penetration enhancer, after must compacting being filled up, ability capping;
(6) rate of heating controls at 80-100 DEG C/h, soaking time: 5 min/mm;
(7) during workpiece quenching, taken out fast by workpiece in case, minimum quenching temperature is not less than 980 DEG C, is cooled to 80-100 DEG C, immediately tempering;
(8) during tempering, rate of heating controls at 60-80 DEG C/h, 600 DEG C of insulation 30min, furnace cooling;
Second step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 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:
(1) when low temperature oozes altogether, cleaning workpiece surface residual penetration enhancer, wipe oil;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5 min/mm, after coming out of the stove, and workpiece air cooling;
3rd step: carbonitriding: comprise low temperature and ooze altogether: 550 DEG C × 4h → furnace cooling → tempering: 180 DEG C × 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:
(1), when low temperature oozes altogether, workpiece surface residual penetration enhancer, wipe oil will be cleared up;
(2) penetration enhancer is ground into particle, and particle diameter, at 1-2mm, stirs in agitator, then cases; Binning process is by (2) ~ (5) operation in the first step;
(3) rate of heating controls at 80-100 DEG C/h, 550 DEG C of insulations, soaking time: 5 min/mm, after coming out of the stove, and workpiece air cooling;
(4) after workpiece air cooling to room temperature, carry out 180 DEG C of low-temperaturetemperings, rate of heating controls at 50-60 DEG C/h, soaking time: 5 min/mm, cool to room temperature with the furnace, and confusion technology completes.
3.the preparation method of die steel rare earth special boron according to claim 2, carbon, nitrogen multicomponent diffusion medium, is characterized in that: the mixture of described charcoal and gac comprises: charcoal content is 80-95%, and activated carbon content is 5-20%.
4.the preparation method of die steel rare earth special boron according to claim 2, carbon, nitrogen multicomponent diffusion medium, it is characterized in that: in described binning process, require that workpiece is put spacing and is: workpiece and the spacing at the bottom of case are 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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|---|---|---|---|
| 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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| Publication Number | Publication Date |
|---|---|
| CN103382543A CN103382543A (en) | 2013-11-06 |
| CN103382543B true CN103382543B (en) | 2015-06-24 |
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| CN103866333B (en) * | 2014-03-05 | 2015-12-30 | 辽宁工业大学 | Cr12MoV steel nitrogen-carbon cocementing process |
| 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 |
| CN105039904B (en) * | 2015-06-04 | 2017-09-29 | 刘永春 | A kind of chromium titanium nitrogen carbon multicomponent diffusion medium and its co-infiltrating method |
| 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 |
| 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 |
| CN108405646B (en) * | 2018-03-19 | 2019-10-15 | 福建奋安铝业有限公司 | A kind of extruding die for aluminum shaped material and its processing technology |
| CN113005394B (en) * | 2021-02-22 | 2021-12-07 | 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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