CN103320674B - A kind of band carbide austempored ductile iron and quenching technology thereof - Google Patents
A kind of band carbide austempored ductile iron and quenching technology thereof Download PDFInfo
- Publication number
- CN103320674B CN103320674B CN201310290877.4A CN201310290877A CN103320674B CN 103320674 B CN103320674 B CN 103320674B CN 201310290877 A CN201310290877 A CN 201310290877A CN 103320674 B CN103320674 B CN 103320674B
- Authority
- CN
- China
- Prior art keywords
- ductile iron
- quenching
- carbide
- workpiece
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
A kind of band carbide austempored ductile iron and quenching technology thereof add Cr and B on Mn, Si alloy basis, suitable increase carbide amount also carries out breeding Metamorphism treatment with RE-B, make the lumps that carbide becomes fine uniform to distribute, to improve hardness, resistance to abrasion, hardening capacity and toughness; Add Sn and increase Si amount, improve base electrode current potential, and jointly form surface passivated membrane with Cr, to improve erosion resistance.The quenching technology of this band carbide austempored ductile iron is progressive austempering, key be by austenitizing process after workpiece hierarchical quenching oil carry out first step isothermal quenching, after avoiding perlite to produce, second stage isothermal quenching is carried out with proper temperature in air constant-temperature oven, to obtain on appropriate fine needle lower bainite basis, increase the tempered martensite scale of construction, further raising hardness and resistance to abrasion, thus the band carbide austempored ductile iron obtaining that intensity hardness is high, toughness is appropriate, wear-resistant erosion resistance is strong, processing characteristics is good, precision easily ensures, cost is low.
Description
Technical field
The present invention relates to technical field of metal material heat treatment, particularly relate to a kind of band carbide austempored ductile iron and quenching technology thereof.
Background technology
In prior art, the parts and components of many fluid machineries all has special requirement, the flow passage components such as impeller, pump case as transh pump need require to have the structural part of high precision, high rigidity, high strength and proper toughness through machining, this is because this kind of structural part normally operation in the operating mode containing the similar hard particles such as such as quartz sand and corrosive medium, make this kind of structural part usually because of wearing and tearing or corrode and cause scrapping.As selected stainless steel, nickelic corrosiron manufactures this kind of structural part, although can meet corrosion resistant requirement, the material hardness of these materials, intensity are all lower and not wear-resisting; And select high chromium corrosiron to manufacture this kind of structural part, although anti-erosion performance is excellent, there is the problem that fragility is large, intensity is low in the material of this material.And above-mentioned materials ubiquity that price is high, machinability is poor, tooling cost is high, working accuracy is difficult to the problems such as guarantee.
Austempored ductile iron of the prior art (ADI), refers to the cast iron materials that the spheroidal graphite cast iron of certain ingredients obtains after isothermal quenching technique thermal treatment.There is the comprehensive mechanical performance that high intensity, unit elongation and impact value etc. are good, but also there is higher bending fatigue strength and wear resistance.Austempored ductile iron of the prior art (ADI) typically uses traditional thermal treatment process, this thermal treatment process carries out means of isothermal quenching by salt made from earth containing a comparatively high percentage of sodium chloride salt bath to obtain austempored ductile iron (ADI), the salt made from earth containing a comparatively high percentage of sodium chloride salt bath austempering technique of this austempored ductile iron (ADI), that spheroidal graphite cast iron is heated to austenitic state, after isothermal processes for some time, use salt made from earth containing a comparatively high percentage of sodium chloride salt bath quenching to iron body state isothermal processes difficult to understand, then cooling obtains austempored ductile iron in atmosphere.As this kind of structural part selecting current austempored ductile iron to manufacture the flow passage components such as impeller, pump case of transh pump, hardness, resistance to abrasion and etch resistant properties are still inadequate, still need to improve further, to meet the more high performance needs of this kind of structural parts such as the flow passage components of transh pump.
And traditional austempering ductile iron need add expensive molybdenum (Mo) and nickel (Ni) and increase substantially its price.In traditional salt made from earth containing a comparatively high percentage of sodium chloride salt bath austempering process treatment process, because salt made from earth containing a comparatively high percentage of sodium chloride not only can produce a large amount of nitrite objectionable impuritiess when melting, serious environment pollution, be detrimental to health, and in isothermal quenching technique treating processes the time of salt made from earth containing a comparatively high percentage of sodium chloride melting and isothermal quenching longer, cause productivity low, production cost is high.
Chinese invention patent (patent No. is 200910088451.4) discloses " a kind of austempored ductile iron ploughshare with carbide and production method thereof ", the technical problem underlying that this technical scheme solves is traditional white pig iron, low chromium or rich chromium cast iron hardness is high and technical problem that toughness is low, the method that it adopts changes the composition of spheroidal graphite cast iron, it comprises the Chemical Composition of following weight percents: C3.40 ~ 3.80, Si2.20 ~ 2.80, Mn0.20 ~ 0.50, P≤0.03, S≤0.02, Mg0.03 ~ 0.04, Re0.01 ~ 0.02, Cr0.25 ~ 0.50, all the other are iron; Graphite metallographic structure in described spheroidal graphite cast iron is: Oxygen potential more than 2 grades, graphite size more than 6 grades, graphite >100/MM2; The matrix of described spheroidal graphite cast iron is: martensite+lower bainite+residual austenite+carbide; Described carbide <20WT%.
But this spheroidal graphite cast iron corrosion resistance, machinability and hardening capacity are still very not enough, working accuracy is difficult to ensure card, therefore still difficulty meets the requirement on the material capability of this kind of structural parts such as the flow passage components manufacturing transh pump, and the salt made from earth containing a comparatively high percentage of sodium chloride isothermal quenching of its heat treating method, cost is high, and pollution weight, poor-performing, efficiency are not high yet.
Therefore, for existing problems of the prior art, need the band carbide austempored ductile iron technology that a kind of high rigidity, wear resistant corrosion resistant are provided badly, and oligosaprobic band carbide isothermal quenching technique technology seems particularly important.
Summary of the invention
The object of the invention is to avoid weak point of the prior art and a kind of high rigidity, wear-resistant and anticorrosive strong and intensity is high, toughness is suitable, processing characteristics is good, working accuracy can ensure, cost is low, pollute few band carbide austempored ductile iron is provided.
Object of the present invention is achieved through the following technical solutions:
A kind of band carbide austempored ductile iron, comprises the component of following weight percent,
C 3.3 ~ 3.8%
P 0.01~0.05%
S 0.005~0.02%
Mg 0.025 ~ 0.045%
Re 0.015 ~ 0.03%
Sn 0.1~0.8%
Si 2.8~3.6%
Mn 1.5～2.8％
Cr 0.2~0.8%
B 0.02～0.08％
All the other are Fe.
Preferably, the weight percent content of Sn, Si, Mn, Cr and B in band carbide austempored ductile iron is as follows,
Sn 0.3~0.5%
Si 3.0~3.4%
Mn 1.8～2.2％
Cr 0.4~0.6%
B 0.03～0.05％
Preferred, the weight percent content of Sn, Si, M n, Cr and B in band carbide austempored ductile iron is as follows,
Sn 0.4%
Si 3.1%
Mn 2.0%
Cr 0.5%
B 0.04％
Preferably, described a kind ofly also comprise rare-earth-boron compound modifier for breeding Metamorphism treatment with carbide austempored ductile iron, described rare-earth-boron compound modifier is 0.1 ~ 0.3% of the weight percent of described band carbide austempored ductile iron.Increase rare-earth-boron compound modifier and Metamorphism treatment is bred to carbide, bulk that is tiny, that be evenly distributed or bulk carbide can be obtained, effectively reduce fragility and improve resistance to abrasion further, ensure intensity, toughness and resistance to abrasion that product is enough.Wherein, described rare-earth-boron compound modifier is 0.2% of the weight percent of described band carbide austempored ductile iron.
Above, the matrix of described band carbide austempored ductile iron is made up of the component of following volume percent:
Lower bainite 50 ~ 70%
Tempered martensite 18 ~ 30%
Eutectic carbides 10 ~ 30%
Rich carbon austenitic 2 ~ 10%.
Preferably, the matrix of described band carbide austempored ductile iron is made up of the component of following volume percent:
Lower bainite 50 ~ 68%
Tempered martensite 20 ~ 30%
Eutectic carbides 10 ~ 28%
Rich carbon austenitic 2 ~ 9%.
Another object of the present invention is to avoid weak point of the prior art and the quenching technology of a kind of low stain, high rate/low cost production, effectively obtained high rigidity, wear-resistant and anticorrosive strong, intensity is high, toughness is suitable, processing characteristics is good, working accuracy can ensure band carbide austempored ductile iron is provided.
Another object of the present invention is achieved through the following technical solutions:
A kind of band carbide austempored ductile iron quenching technology, for using hierarchical quenching oil and air constant-temperature oven progressive austempering technique, includes following steps:
(1) by workpiece heat to austenitizing temperature, isothermal holding makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into hierarchical quenching oil, be cooled to below martensite start temperature, carry out first step isothermal quenching;
(3) taken out from hierarchical quenching oil by the workpiece through step (2) first step means of isothermal quenching, send in air constant-temperature oven and carry out second stage isothermal quenching, the temperature in described air constant-temperature oven is higher than bainite transformation final temperature;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
Preferably, a kind of band carbide austempored ductile iron quenching technology, includes following steps:
(1) by workpiece heat to austenitizing temperature 880 ~ 950 DEG C, isothermal holding 1.0 ~ 3.5h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 10 ~ 15 times of workpiece, be cooled to 150 ~ 200 DEG C with the speed of cooling of 50 ~ 100 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, wherein, the temperature in described air constant-temperature oven is 200 ~ 260 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
Preferred, a kind of band carbide austempored ductile iron quenching technology, includes following steps:
(1) by workpiece heat to austenitizing temperature 900 ~ 930 DEG C, isothermal holding 2.0 ~ 3.0h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 12 ~ 13 times of workpiece, be cooled to 160 ~ 180 DEG C with the speed of cooling of 70 ~ 90 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, wherein, the temperature in described air constant-temperature oven is 220 ~ 240 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
Beneficial effect of the present invention:
(1) a kind of band carbide austempored ductile iron, on Mn, Si alloy basis, by the chemical element composition of adjustment belt carbide austempored ductile iron, it is made to contain Sn 0.1 ~ 0.8%, Si 2.8 ~ 3.5%, Cr 0.2 ~ 0.8%, B 0.02 ~ 0.07%, owing to adding appropriate Cr and B suitably to adjust carbide content in heat treatment process, improve hardness, resistance to abrasion and hardening capacity.Simultaneously, add the Sn of trace relative to prior art and increase the content of Si, jointly to improve base electrode current potential, and be jointly with the surface of carbide austempored ductile iron to form passive film with Cr, enhance resistance to abrasion and the erosion resistance of band carbide austempored ductile iron.0.1 ~ 0.3% rare-earth-boron compound modifier is used to breed Metamorphism treatment to carbide in addition, to obtain lumps carbide that is tiny, that be evenly distributed, to reduce fragility and to improve resistance to abrasion further.Band carbide austempored ductile iron hardness of the present invention is high, wear-resistant and erosion resistance is strong, intensity is high, toughness is suitable, processing characteristics is good, working accuracy can ensure, cost is low.
(2) a kind of band carbide austempored ductile iron quenching technology, hierarchical quenching oil is used to be quickly cooled to below martensite start temperature the workpiece after austenitizing isothermal processes, effectively avoid pearlitic generation, and on the lower bainite basis obtaining appropriate fine acicular, add the content of tempered martensite, further effectively improve hardness and the resistance to abrasion of product.
Meanwhile, the present invention adopts progressive austempering technique to heat-treat workpiece, the band carbide austempored ductile iron that obtained matrix is desirable, and this band carbide austempored ductile iron comprehensive mechanical performance is good, intensity б
b>=700Mpa, impact toughness reaches α
k8 ~ 15J/cm
2, progressive austempering workhardness before treatment is that HB250 ~ 330, processing characteristics are good, and after process, hardness reaches HRC56 ~ 62, because product is zero distortion or Light deformation, therefore does not need to use expensive ground finish just can ensure precision.
In addition, of the present invention a kind of with carbide austempored ductile iron hierarchical quenching oil and air constant-temperature oven progressive austempering technique relative to traditional smoke of gunpowder isothermal quenching technique, the nuisances such as a large amount of nitrite can not be produced, low stain, safer and cost is low, productivity is high.
Accompanying drawing explanation
The present invention will be further described to utilize accompanying drawing, but the content in accompanying drawing does not form any limitation of the invention.
Fig. 1 is a kind of schematic diagram with carbide austempored ductile iron quenching technology of the present invention.
Include in FIG:
AB---be heated to the process of austenitizing temperature;
BC---insulation, makes austenite carbon saturated;
CD---oil quenching, puts into hierarchical quenching oil and makes workpiece reach the process of the following temperature of martensite start temperature by workpiece;
Bf---bainite transformation final temperature;
Ms---martensite start temperature;
DE---the process of first step means of isothermal quenching;
EF---fuel-displaced, by the process that workpiece takes out from hierarchical quenching oil
FG---in air constant-temperature oven, carry out the process of second stage isothermal processes;
GH---the process of air cooling to room temperature of coming out of the stove.
Embodiment
The invention will be further described with the following Examples.
embodiment 1.
The one band carbide austempored ductile iron of the present embodiment, comprises the component of following weight percent,
C 3.3 ~ 3.8%
P 0.01~0.05%
S 0.005~0.02%
Mg 0.025 ~ 0.045%
Re 0.015 ~ 0.03%
Sn 0.1~0.8%
Si 2.8~～3.6％
Mn 1.5～2.8％
Cr 0.2~0.8%
B 0.02～0.08％
All the other are Fe.
The present invention have adjusted the chemical element composition of band carbide austempored ductile iron, makes it
at Mn, Si alloycontaining Sn 0.1 ~ 0.8%, Si 2.8 ~ 3.5%, Cr 0.2 ~ 0.8% on basis, owing to adding appropriate Cr and B, suitably to adjust carbide content in heat treatment process, improve resistance to abrasion and hardening capacity.Simultaneously, the content of Sn and Si of trace is with the addition of relative to prior art, make Sn and Si jointly improve base electrode current potential, and be jointly with the surface of carbide austempored ductile iron to form passive film with Cr, enhance the erosion resistance of band carbide austempored ductile iron.Band carbide austempored ductile iron cost of the present invention is low, productivity is high, hardness is high, intensity is high, toughness is suitable, wear-resistant and erosion resistance strong, and processing characteristics is good, working accuracy can ensure.
In addition, in the present embodiment, above-mentioned band carbide austempored ductile iron also comprises the rare-earth-boron compound modifier for breeding Metamorphism treatment, and described rare-earth-boron compound modifier is 0.1 ~ 0.3% of the weight percent of described band carbide austempored ductile iron.Heat-treating in process to workpiece, increase rare-earth-boron compound modifier and Metamorphism treatment is bred to carbide, bulk that is tiny, that be evenly distributed or bulk carbide can be obtained, effectively reduce product fragility, ensure the intensity that product is enough and toughness and improve its resistance to abrasion further.
Band carbide austempored ductile iron after heat treatment, its matrix is made up of the component of following volume percent:
Lower bainite 50 ~ 70%
Tempered martensite 18 ~ 30%
Eutectic carbides 10 ~ 30%
Rich carbon austenitic 2 ~ 10%.
This rich carbon austenitic refer to carbon content be weight percentage 1.2 ~ 1.8% austenite.
In the present embodiment, the quenching technology such as use hierarchical quenching oil and the classification of air constant-temperature oven etc. of above-mentioned band carbide austempored ductile iron, as shown in Figure 1,
For progressive austempering technique, include following steps: (1), by workpiece heat to austenitizing temperature (AB section), isothermal holding makes austenite carbon saturated (BC section);
(2) workpiece processed through step (1) is put into hierarchical quenching oil, be cooled to martensite start temperature (Ms) (CD section) below, carry out first step isothermal quenching (DE section);
(3) will take out from hierarchical quenching oil (EF section) through the workpiece of step (2) first step means of isothermal quenching, send in air constant-temperature oven and carry out second stage isothermal quenching (FG section), the temperature in described air constant-temperature oven is higher than bainite transformation final temperature (Bf);
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling (GH section).
Above-mentioned workpiece starting material are spheroidal graphite cast iron, after heat treatment obtain band carbide austempored ductile iron.
This band carbide austempored ductile iron quenching technology, hierarchical quenching oil is used to be quickly cooled to below martensite start temperature the workpiece after austenitizing isothermal processes, effectively avoid pearlitic generation, and on the lower bainite basis obtaining appropriate fine acicular, add the content of tempered martensite, effectively improve hardness and the wear resistance of product.
Meanwhile, the present invention adopts progressive austempering technique to heat-treat workpiece, the band carbide austempored ductile iron that obtained matrix is desirable, and this band carbide austempored ductile iron comprehensive mechanical performance is good, and hardness reaches HRC56 ~ 62, intensity б
b>=700Mpa, impact toughness reaches α
k8 ~ 15J/cm
2, workhardness HB250 ~ 330 before progressive austempering process, processing characteristics is good, hardness HRC56 ~ 62 after process, because product zero is out of shape or Light deformation, therefore does not need to adopt expensive ground finish, just can ensure working accuracy.
In addition, of the present invention a kind of with carbide hierarchical quenching oil and air constant-temperature oven austempored ductile iron quenching technology relative to traditional smoke of gunpowder isothermal quenching technique, the nuisances such as a large amount of nitrite can not be produced, low stain, safer, and cost is low, productivity is high, hardness and intensity is high, toughness is appropriate, processing characteristics is good, working accuracy easily ensures.
embodiment 2.
One band carbide austempored ductile iron of the present invention, comprises the component of following weight percent,
C 3.5~3.7%
P 0.02~0.03%
S 0.005~0.01%
Mg 0.03~0.04%
Re 0.02~0.025%
Sn 0.3~0.5%
Si 3.0~3.2%
Mn 1.9～2.1％
Cr 0.4~0.6%
B 0.02～0.07％
RE-B 0.1~0.3%
All the other are Fe.
Above-mentioned RE-B is rare-earth-boron compound modifier, and its component is the common practise of this area, is not described in detail in this.Band carbide austempored ductile iron of the present invention adds rare-earth-boron compound modifier (RE-B) and breeds Metamorphism treatment to the carbide in workpiece, effectively can reduce the fragility of product, ensure its enough intensity and suitable toughness, increase resistance to abrasion further.
The matrix of band carbide austempored ductile iron of the present invention is made up of the component of following weight percent:
Lower bainite 50 ~ 70%
Tempered martensite 18 ~ 30%
Eutectic carbides 10 ~ 30%
Rich carbon austenitic 2 ~ 10%,
Rationally, good combination property, can meet the industrial demand for high rigidity, resistance to abrasion and the corrosion stability the flow passage components such as transh pump impeller, pump case to this matrix composition.
Meanwhile, one band carbide austempored ductile iron hierarchical quenching oil of the present invention and air constant-temperature oven progressive austempering technique, include following steps:
(1) by workpiece heat to austenitizing temperature 880 ~ 950 DEG C, isothermal holding 1.0 ~ 3.5h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 10 ~ 15 times of workpiece, be cooled to 150 ~ 200 DEG C with the speed of cooling of 50 ~ 100 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, wherein, the temperature in described air constant-temperature oven is 200 ~ 260 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
In thermal treatment process, after chemical element composition is determined, austenitizing temperature and time and classification isothermal temperature and time are the principal elements affecting workpiece substrate structure property, therefore, suitable processing parameter is chosen very large to the matrix and performance impact of being with carbide austempored ductile iron.The present embodiment adopts progressive austempering and suitable parameter, the band carbide austempored ductile iron obtained is had hardness is high, intensity is high, toughness is suitable, resistance to abrasion and erosion resistance is strong, processing characteristics well, working accuracy the advantage such as to ensure.Simultaneously, the present invention because of adopt cost low by hierarchical quenching oil and the air constant-temperature oven progressive austempering technique without salt made from earth containing a comparatively high percentage of sodium chloride, alloying element used is all cheap and amount is few, in hardening treatment on supporting tinuous production, the situation of workpiece deformation and oxidation is effectively avoided to occur, and technical process does not need to carry out grinding precision work, decreases processing step and relevant device, and efficiency is high, cost is low.
The main technical schemes of the present embodiment is substantially the same manner as Example 1, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1, no longer repeats at this.
embodiment 3.
One band carbide austempored ductile iron of the present invention, comprises the component of following weight percent,
C 3.6%
P 0.0253%
S 0.008%
Mg 0.035%
Re 0.022%
Sn 0.4%
Si 3.1%
Mn 2.0％
Cr 0.5%
B 0.04％
RE-B 0.2%
All the other are Fe.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2, no longer repeats at this.
The matrix of this band carbide austempored ductile iron is made up of the component of following weight percent:
Lower bainite 50 ~ 68%
Tempered martensite 20 ~ 30%
Eutectic carbides 10 ~ 28%
Rich carbon austenitic 2 ~ 9%.
Meanwhile, the present invention's one band carbide austempored ductile iron quenching technology, includes following steps:
(1) by workpiece heat to austenitizing temperature 900 ~ 930 DEG C, isothermal holding 2.0 ~ 3.0h makes austenite carbon saturated, obtains rich carbon austenitic;
(2) workpiece processed through step (1) is put into the progressive austempering oil that weight is the weight 12 ~ 13 times of workpiece, be cooled to 160 ~ 180 DEG C with the speed of cooling of 70 ~ 90 DEG C/min, carry out first step isothermal quenching, obtain partial martensite;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from progressive austempering oil, send in air constant-temperature oven and carry out second stage isothermal quenching, obtain suitable lower bainite, tempered martensite; Wherein, the temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and its temperature is 220 ~ 240 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2, no longer repeats at this.
embodiment 4.
The one band carbide austempored ductile iron of the present embodiment, comprises the component of following weight percent,
C 3.3%
P 0.035％
S 0.015％
Mg 0.025%
Re 0.015 %
Sn 0.1%
Si 2.8%
Mn 1.5％
Cr 0.2%
B 0.02％
RE-B 0.1%
All the other are Fe.
The matrix of this band carbide austempored ductile iron is made up of the component of following volume percent:
Lower bainite 60%
Tempered martensite 22%
Eutectic carbides 13%
Rich carbon austenitic 5%.
Meanwhile, one band carbide austempored ductile iron quenching technology of the present invention, includes following steps:
(1) by workpiece heat to austenitizing temperature 880 DEG C, isothermal holding 1.0h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 10 times of workpiece, be cooled to 150 DEG C with the speed of cooling of 50 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and wherein, the temperature in described air constant-temperature oven is 220 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 or embodiment 3 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2 or embodiment 3, no longer repeats at this.
embodiment 5.
The one band carbide austempored ductile iron of the present embodiment, comprises the component of following weight percent,
C 3.8%
P 0.05%
S 0.02%
Mg 0.045%
Re 0.025%
Sn 0.8%
Si 3.5％
Mn 2.5％
Cr 0.8%
B 0.03％
RE-B 0.3%
All the other are Fe.
The matrix of this band carbide austempored ductile iron is made up of the component of following weight percent:
Lower bainite 50%
Tempered martensite 18%
Eutectic carbides 30%
Rich carbon austenitic 2%,
Meanwhile, one band carbide austempored ductile iron quenching technology of the present invention, includes following steps:
(1) by workpiece heat to austenitizing temperature 950 DEG C, isothermal holding 3.5h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 15 times of workpiece, be cooled to 200 DEG C with the speed of cooling of 100 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and wherein, the temperature in described air constant-temperature oven is 230 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 or embodiment 3 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2 or embodiment 3, no longer repeats at this.
embodiment 6.
One band carbide austempored ductile iron of the present invention, comprises the component of following weight percent,
C 3.5%
P 0.01%
S 0.005%
Mg 0.03%
Re 0.015%
Sn 0.3%
Si 3.0%
Mn 1.8％
Cr 0.4%，
B 0.02％
All the other are Fe.
The matrix of this band carbide austempored ductile iron is made up of the component of following weight percent:
Lower bainite 70%
Tempered martensite 10%
Eutectic carbides 10%
Rich carbon austenitic 10%,
Meanwhile, one band carbide austempored ductile iron quenching technology of the present invention, includes following steps:
(1) by workpiece heat to austenitizing temperature 900 DEG C, isothermal holding 2.0h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 12 times of workpiece, be cooled to 180 DEG C with the speed of cooling of 70 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and wherein, the temperature in described air constant-temperature oven is 220 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 or embodiment 3 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2 or embodiment 3, no longer repeats at this.
embodiment 7.
One band carbide austempored ductile iron of the present invention, comprises the component of following weight percent,
C 3.7%
P 0.03%
S 0.01%
Mg 0.04%
Re 0.025%
Sn 0.5%
Si 3.2%
Mn 2.2％
Cr 0.6%，
B 0.035
All the other are Fe.
The matrix of this band carbide austempored ductile iron is made up of the component of following weight percent:
Lower bainite 68%
Tempered martensite 20%
Eutectic carbides 11%
Rich carbon austenitic 9%.
Meanwhile, one band carbide austempored ductile iron quenching technology of the present invention, includes following steps:
(1) by workpiece heat to austenitizing temperature 930 DEG C, isothermal holding 3.0h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 13 times of workpiece, be cooled to 180 DEG C with the speed of cooling of 90 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and wherein, the temperature in described air constant-temperature oven is 240 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 or embodiment 3 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2 or embodiment 3, no longer repeats at this.
embodiment 8.
One band carbide austempored ductile iron of the present invention, comprises the component of following weight percent,
C 3.5~3.7%
P 0.02~0.03%
S 0.005~0.01%
Mg 0.03~0.04%
Re 0.02~0.025%
Sn 0.3~0.5%
Si 3.0~3.2%
Mn 1.8～2.0％
Cr 0.4~0.6%，
B 0.02～0.04％
RE-B 0.1~0.3%
All the other are Fe.
The matrix of this band carbide austempored ductile iron is made up of the component of following weight percent:
Lower bainite 60%
Tempered martensite 20%
Eutectic carbides 15%
Rich carbon austenitic 5%.
Meanwhile, one band carbide austempored ductile iron quenching technology of the present invention, includes following steps:
(1) by workpiece heat to austenitizing temperature 920 DEG C, isothermal holding 2.5h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 12.5 times of workpiece, be cooled to 170 DEG C with the speed of cooling of 80 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, and wherein, the temperature in described air constant-temperature oven is 260 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 or embodiment 3 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2 or embodiment 3, no longer repeats at this.
embodiment 9.
The one band carbide austempored ductile iron of the present embodiment, comprises the component of following weight percent,
C 3.3 ~ 3.8%
P 0.01~0.05
S 0.005~0.015
Mg 0.025 ~ 0.045%
Re 0.015 ~ 0.03%
Sn 0.1~0.8%
Si 3.6％
Mn 2.8％
Cr 0.2~0.8%
B 0.05%
All the other are Fe.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2, no longer repeats at this.
embodiment 10.
One band carbide austempored ductile iron of the present invention, on the basis of embodiment 1 or embodiment 2, its composition also comprises the one or more than one of V, Ti, W, La, Ce and Sn.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2, no longer repeats at this.
embodiment 11.
One band carbide austempored ductile iron of the present invention, be with the difference of embodiment 7, the weight percentage of V, Ti, W, La, Ce and Sn is respectively 0.03 ~ 0.58%, 0.012 ~ 0.032%, 0.007 ~ 0.971%, 0.005 ~ 0.023%, 0.003 ~ 0.3%.
The main technical schemes of the present embodiment and embodiment 1 or embodiment 2 substantially identical, the feature do not laid down a definition in the present embodiment, adopts the explanation in embodiment 1 or embodiment 2, no longer repeats at this.
Finally should be noted that; above embodiment is only for illustration of technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (7)
1. be with a carbide austempored ductile iron, it is characterized in that: the component including following weight percent content,
C 3.3 ~ 3.8%
P 0.01~0.05%
S 0.005~0.02%
Mg 0.025 ~ 0.045%
Re 0.015 ~ 0.03%
Sn 0.3~0.5%
Si 2.8~3.6%
Mn 1.5～2.8％
Cr 0.2~0.8％
B0.02～0.08％
All the other are Fe; Also comprise the rare-earth-boron compound modifier for breeding Metamorphism treatment, described rare-earth-boron compound modifier is 0.1 ~ 0.3% of the weight percent of described band carbide austempored ductile iron;
Quenching technology with carbide austempored ductile iron is the oily and air constant-temperature oven progressive austempering technique with progressive austempering, includes following steps:
(1) by workpiece heat to austenitizing temperature 880 ~ 950 DEG C, isothermal holding 1.0 ~ 3.5h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the progressive austempering oil that weight is the weight 10 ~ 15 times of workpiece, be cooled to 150 ~ 200 DEG C with the speed of cooling of 50 ~ 100 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from progressive austempering oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, wherein, the temperature in described air constant-temperature oven is 200 ~ 260 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
2. one band carbide austempored ductile iron according to claim 1, is characterized in that: the weight percent content of Sn, Si, Mn, Cr and B is as follows,
Sn 0.3~0.5%
Si 3.0~3.4%
Mn 1.8～2.2％
Cr 0.4~0.6%
B 0.03～0.05％。
3. one band carbide austempored ductile iron according to claim 2, is characterized in that: Sn, Si, Mn
,the weight percent content of Cr and B is as follows,
Sn 0.4%
Si 3.1%
Mn 2.0％
Cr 0.5%
B 0.04%。
4. the one band carbide austempored ductile iron according to claim 1 or 2 or 3, is characterized in that: described rare-earth-boron compound modifier is 0.2% of the weight percent of described band carbide austempored ductile iron.
5. the one band carbide austempored ductile iron according to claim 1 or 2 or 3, is characterized in that: matrix is made up of the component of following volume percent:
Lower bainite 50 ~ 70%
Tempered martensite 18 ~ 30%
Eutectic carbides 10 ~ 30%
Rich carbon austenitic 2 ~ 10%.
6. one band carbide austempored ductile iron according to claim 5, is characterized in that: matrix is made up of the component of following volume percent:
Lower bainite 50 ~ 68%
Tempered martensite 20 ~ 30%
Eutectic carbides 10 ~ 28%
Rich carbon austenitic 2 ~ 9%.
7. a kind of austempored ductile iron according to claim 1, is characterized in that: the quenching technology of described austempored ductile iron includes following steps:
(1) by workpiece heat to austenitizing temperature 900 ~ 930 DEG C, isothermal holding 2.0 ~ 3.0h makes austenite carbon saturated;
(2) workpiece processed through step (1) is put into the hierarchical quenching oil that weight is the weight 12 ~ 13 times of workpiece, be cooled to 160 ~ 180 DEG C with the speed of cooling of 70 ~ 90 DEG C/min, carry out first step isothermal quenching;
(3) workpiece through step (2) first step means of isothermal quenching is taken out from hierarchical quenching oil, send in air constant-temperature oven and carry out second stage isothermal quenching, temperature in described air constant-temperature oven is higher than bainite transformation final temperature, wherein, the temperature in described air constant-temperature oven is 220 ~ 260 DEG C;
(4) workpiece through step (3) second stage means of isothermal quenching is placed in air naturally cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290877.4A CN103320674B (en) | 2013-07-11 | 2013-07-11 | A kind of band carbide austempored ductile iron and quenching technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290877.4A CN103320674B (en) | 2013-07-11 | 2013-07-11 | A kind of band carbide austempored ductile iron and quenching technology thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103320674A CN103320674A (en) | 2013-09-25 |
| CN103320674B true CN103320674B (en) | 2015-10-21 |
Family
ID=49189710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310290877.4A Active CN103320674B (en) | 2013-07-11 | 2013-07-11 | A kind of band carbide austempored ductile iron and quenching technology thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103320674B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789603A (en) * | 2014-01-24 | 2014-05-14 | 宁国市中意耐磨材料有限公司 | Ausferrite nodular iron casting with adjustable performance and manufacturing method thereof |
| CN103834854B (en) * | 2014-03-20 | 2016-03-23 | 上海宝华威热处理设备有限公司 | A kind of austempering ductile iron running roller for heat-treatment production line push-and-pull vehicle and production method thereof |
| CN104264076B (en) * | 2014-09-12 | 2016-08-24 | 奥展实业有限公司 | A kind of wear-resisting nut and manufacture method thereof |
| CN104294182B (en) * | 2014-09-12 | 2016-08-24 | 奥展实业有限公司 | A kind of embedded outer knurled nut and manufacture method thereof |
| CN105886946B (en) * | 2016-04-15 | 2018-06-08 | 芜湖德业摩擦材料有限公司 | A kind of preparation method of brake-pad friction block |
| CN105969948B (en) * | 2016-07-25 | 2018-08-10 | 白城北奥新材料科技有限公司 | A kind of oil cooling isothermal hardening production method of high-performance austempered ductile iron |
| CN108559903B (en) * | 2018-05-29 | 2020-04-10 | 河南工程学院 | Cooling-controlled bainite nodular cast iron cylinder sleeve and preparation method thereof |
| CN109112389B (en) * | 2018-10-10 | 2019-08-02 | 武汉纺织大学 | A kind of cooling technique for preparing austenic globe body of control |
| CN114231830A (en) * | 2021-11-05 | 2022-03-25 | 宁国东方碾磨材料股份有限公司 | Nodular cast iron grinding ball and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60121253A (en) * | 1983-12-05 | 1985-06-28 | Nissan Motor Co Ltd | Spheroidal graphite cast iron |
| CN1229145A (en) * | 1999-02-02 | 1999-09-22 | 王道年 | Grinding ball for ball mill |
| FI118738B (en) * | 2005-01-05 | 2008-02-29 | Metso Paper Inc | Globe Granite Cast Iron and Method of Manufacturing Globe Granite Cast Iron for Machine Construction Parts that Require Strength and Toughness |
-
2013
- 2013-07-11 CN CN201310290877.4A patent/CN103320674B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103320674A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103320674B (en) | A kind of band carbide austempored ductile iron and quenching technology thereof | |
| CN103088249B (en) | Abrasion-resistant alloy cast iron material with high hardness for chute lining plate, and preparation method thereof | |
| CN104032221B (en) | A kind of Nb-microalloying high-carbon-chromium bearing steel and hot rolling production method thereof | |
| CN103320681B (en) | A kind of austempored ductile iron and quenching technology thereof | |
| KR20130052981A (en) | Nodula graphite cast iron and manufacturing method of vane using the same | |
| RU2763722C1 (en) | SULPHUR-RESISTANT PIPE FOR A PETROLEUM BOREHOLE ATTRIBUTED TO THE KILOPOUND/INCH2 (862 MPa) STEEL STRENGTH CLASS, AND METHOD FOR MANUFACTURE THEREOF | |
| JP5655366B2 (en) | Bainite steel | |
| CN102199738A (en) | Low carbon, nickel-saving, high-strength, high-toughness, corrosion-resistant and nonmagnetic austenite stainless steel | |
| CN111893381A (en) | High-nitrogen stainless bearing steel and preparation method thereof | |
| CN103627960A (en) | Wear-resistant cast steel | |
| CN101215671B (en) | Material capable of resisting zinc solution corrosive wear and manufacturing method thereof | |
| JP5226083B2 (en) | High alloy cold die steel | |
| JP5700174B2 (en) | Induction hardening steel | |
| CN109694983B (en) | High-mirror-surface corrosion-resistant plastic die steel and manufacturing method thereof | |
| JP5262740B2 (en) | Case-hardened steel with excellent coarse grain prevention and fatigue characteristics during carburizing and its manufacturing method | |
| CN109609729A (en) | Stainless steel plate with 650 MPa-grade yield strength and manufacturing method thereof | |
| JPWO2012081229A1 (en) | High carbon chromium bearing steel and manufacturing method thereof | |
| CN102796959B (en) | A kind of corrosion-resistant plastic die steel and manufacture method thereof | |
| JP5945935B2 (en) | High chromium wear resistant cast iron and method for producing the same | |
| CN109504847B (en) | Low-cost plastic die steel and preparation method thereof | |
| JP2013227598A (en) | Iron casting and method for manufacturing the same | |
| CN103602903A (en) | High-strength carbon dioxide corrosion-resisting oil well pipe and manufacturing method thereof | |
| JP2017190520A (en) | High strength spring steel having excellent corrosion resistance | |
| CN106884125A (en) | A kind of high-ductility super abrasive non-magnetic rustproof screen steel wire and preparation method thereof | |
| CN106544583A (en) | A kind of super abrasive H13 mould steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160920 Address after: 525200, Jinshan Development Zone, Maoming, Guangdong, two, Gaozhou Patentee after: GAOZHOU CHUANGJIAN CASTING CO.,LTD. Address before: 525200 No. 58 Industrial Avenue, Maoming, Guangdong, Gaozhou Patentee before: Zhu Ruihui Patentee before: Zhu Ruiqiang Patentee before: Zhou Shikang |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A kind of austempered ductile iron with carbide and its quenching process Effective date of registration: 20230208 Granted publication date: 20151021 Pledgee: Bank of China Limited by Share Ltd. Maoming branch Pledgor: GAOZHOU CHUANGJIAN CASTING CO.,LTD. Registration number: Y2023980032206 |