CN107893152A - A kind of heat treatment method of 17CrNiMo6 materials central gear - Google Patents
A kind of heat treatment method of 17CrNiMo6 materials central gear Download PDFInfo
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- CN107893152A CN107893152A CN201711482787.XA CN201711482787A CN107893152A CN 107893152 A CN107893152 A CN 107893152A CN 201711482787 A CN201711482787 A CN 201711482787A CN 107893152 A CN107893152 A CN 107893152A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides a kind of heat treatment method of 17CrNiMo6 materials central gear, comprises the following steps：The strong of carburizing process being carried out to 17CrNiMo6 material work pieces in atmosphere furnace oozing, maintaining in-furnace temperature at 915 DEG C to 925 DEG C, carbon potential is in 1.3%Cp, and temperature hold-time was at 135 to 155 minutes；The High temperature diffusion of carburizing process is carried out, maintains in-furnace temperature at 915 DEG C to 925 DEG C, carbon potential is in 0.8%Cp, and temperature hold-time was at 145 to 165 minutes；Carburizing process terminate after cooling, the workpiece is cooled to 820 DEG C with stove, and is kept for 60 to 70 minutes；Samming quenching is carried out to the workpiece, the quenching oil temperature control of oil quenching is at 75 DEG C；Lonneal is carried out, wherein temperature control is at 175 DEG C, and the tempering duration was at 180 to 210 minutes.The present invention can substantially reduce the production cycle on the premise of product quality is guaranteed, and improve production efficiency.
Description
Technical field
The present invention relates to metal heating processing technology field, more particularly to a kind of heat of 17CrNiMo6 materials central gear
Processing method.
Background technology
17CrNiMo6 materials are DIN material, and the chemical composition of 17CrNiMo6 steel alloys is as follows：Carbon（C）：0.15-
0.20；Chromium（Cr）：1.50-1.80；Nickel（Ni）：1.40-1.70；Molybdenum（Mo）：0.25-0.35；Silicon（Si）：≤0.40；Manganese（Mn）：
0.40-0.70；Sulphur（S）：≤0.035；Phosphorus（P）：≤0.035.17CrNiMo6 materials are mainly used at present transmits larger power
With bear the gear compared with big load, be widely used to the industrial circles such as mine, transport, locomotive traction lifting, wind-power electricity generation.
For 17CrNiMo6 because Cr, Ni content are higher, quenching degree is good, and possesses good mechanical property and toughness.
17CrNiMo-6 material gear traditional handicrafts generally comprise the flows such as carburizing, air cooling, high tempering, quenching, lonneal, wherein
High tempering is primarily to efficiently control the carbide of carburizing and quenching product and the grade of retained austenite.But at existing heat
The production cycle of science and engineering skill is longer, complex operation, and flow is various.
The content of the invention
For above-mentioned technical problem, present invention offer is a kind of can to improve production efficiency on the premise of product quality is ensured
The heat treatment method of 17CrNiMo6 material central gears.
A kind of heat treatment method of 17CrNiMo6 materials central gear of the present invention comprises the following steps：In atmosphere furnace
The strong of carburizing process is carried out to 17CrNiMo6 material work pieces and oozes step, maintaining in-furnace temperature, carbon potential exists at 915 DEG C to 925 DEG C
1.3%Cp, temperature hold-time was at 135 to 155 minutes；The High temperature diffusion for carrying out carburizing process to the workpiece in atmosphere furnace walks
Suddenly, in-furnace temperature is maintained at 915 DEG C to 925 DEG C, and carbon potential is in 0.8%Cp, and temperature hold-time was at 145 to 165 minutes；Carburizing
Journey terminate after cooling step, the workpiece is cooled to 820 DEG C with stove, and is kept for 60 to 70 minutes；Samming is carried out to the workpiece to quench
Fiery step, the samming quenching Step are oil quenching, and quenching oil temperature control is at 75 DEG C；Lonneal step is carried out, wherein tempering temperature
Degree control is at 175 DEG C, and the tempering duration was at 180 to 210 minutes.
It is preferred that in-furnace temperature is maintained in step is oozed by force at 920 DEG C.
It is preferred that temperature hold-time is 145 minutes in step is oozed by force.
It is preferred that the carburizing process processing atmosphere in atmosphere furnace is nitrogen, propane and air.
It is preferred that in-furnace temperature is maintained in high temperature diffusion step at 920 DEG C.
It is preferred that temperature hold-time is 155 minutes in high temperature diffusion step.
It is preferred that the workpiece is cooled to 820 DEG C with stove and kept for 65 minutes in cooling step.
It is preferred that a kind of heat treatment method of 17CrNiMo6 materials central gear of the present invention also includes：In lonneal
The workpiece is come out of the stove after step air cooling.
Compared with prior art, after the heat treatment method of 17CrNiMo6 material central gears of the invention is using improvement
Carburization process, gear carburazing period and time of diffusion period in carburizing process are controlled, reach the mesh for improving yield and saving production capacity
's.The present invention not only in technical requirements can meet demand, while production is substantially reduced on the premise of quality is guaranteed
In the cycle, production efficiency is improved, reduce production cost, and product quality is secure.
Brief description of the drawings
Fig. 1 is a kind of heat treatment method flow chart of 17CrNiMo6 materials central gear of the present invention.
Fig. 2 is the Technology for Heating Processing schematic diagram of one embodiment of the invention.
Fig. 3 is the Technology for Heating Processing schematic diagram of control group one of the present invention.
Fig. 4 is the Technology for Heating Processing schematic diagram of control group two of the present invention.
Embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby coordinate embodiment detailed
It is described as follows.
Incorporated by reference to referring to Fig. 1 and Fig. 2, Fig. 1 is a kind of heat treatment method of 17CrNiMo6 materials central gear of the present invention
Flow chart, Fig. 2 are the Technology for Heating Processing schematic diagram of one embodiment of the invention.At a kind of heat of 17CrNiMo6 materials central gear
Reason method comprises the following steps：
S1, the strong of carburizing process is carried out to 17CrNiMo6 material work pieces in atmosphere furnace and oozes step, maintenance in-furnace temperature is 915
DEG C to 925 DEG C, carbon potential is in 1.3%Cp, and temperature hold-time was at 135 to 155 minutes.As shown in Fig. 2 in one embodiment, strong
Ooze and in-furnace temperature is maintained in step at 920 DEG C；Temperature hold-time is 145 minutes in step is oozed by force.
S2, in atmosphere furnace to the workpiece carry out carburizing process high temperature diffusion step, maintain in-furnace temperature at 915 DEG C extremely
925 DEG C, carbon potential is in 0.8%Cp, and temperature hold-time was at 145 to 165 minutes.As shown in Fig. 2 in one embodiment, expand in high temperature
Rapid middle maintenance in-furnace temperature take a walk at 920 DEG C；Temperature hold-time is 155 minutes in high temperature diffusion step.
S3, carburizing process terminate after cooling step, the workpiece is cooled to 820 DEG C with stove, and is kept for 60 to 70 minutes.Such as
Shown in Fig. 2, in one embodiment, the workpiece is cooled to 820 DEG C with stove and kept for 65 minutes in cooling step.
S4, samming quenching Step is carried out to the workpiece, the samming quenching Step is oil quenching, and quenching oil temperature control is 75
℃。
S5, lonneal step is carried out, wherein temperature control is at 175 DEG C, and the tempering duration is at 180 to 210 points
Clock.In various embodiments, after lonneal step S5 also include the workpiece is come out of the stove air cooling the step of.
In actual applications, German IPSEN stoves can be used in atmosphere furnace, and precious 277 quenching oils of moral profit can be selected in hardening media.
Carburizing process processing atmosphere in atmosphere furnace is nitrogen, propane and air.
The secondary solar gear parameter that by the Technology for Heating Processing of the present invention material can be made to be 17CrNiMo6 reaches following technology
It is required that：Effective case depth 0.9-1.3mm, centre hardness 35-45HRC, case hardness 58-62HRC, carbide K1-4 levels,
Martensite M1-5 levels, retained austenite A1-5 levels；Metallographic structure meets international standard requirement, prevents going out for the defective tissue of infiltration layer
It is existing.
It is inclined that the present invention solves the original directly grade of primary quenching carbide and retained austenite by long-time diffusion
High problem, the step of eliminating high tempering among prior art.Particularly to diffusion period, it is necessary to which carbon potential is dropped to 0.8%
Cp or so, and kept for the rational time, carbide is fully decomposed.
Below by taking the following 17CrNiMo6 steel alloys of chemical composition as an example, three groups of ratios on carburizing time selection are carried out
Compared with experiment.Carbon（C）：0.184；Chromium（Cr）：1.726；Nickel（Ni）：1.568；Molybdenum（Mo）：0.324；Silicon（Si）：≤0.211；Manganese
（Mn）：0.512；Sulphur（S）：≤0.011；Phosphorus（P）：≤0.025.
Contrast groups one：Carburized (case) depth 1.1mm is set, oozes 920 DEG C of stage, carbon potential Cp=1.3%, High temperature diffusion stage by force
920 DEG C, carbon potential Cp=0.8%, ooze by force to 80%（About 170min）, diffuse to 98.5%（About 95min）, carburizing terminate after cooling,
Temperature quenches, and Technology for Heating Processing terminates after lonneal, the technological process duration totally 915 minutes, refers to Fig. 3.
Contrast groups two：Carburized (case) depth 1.1mm is set, oozes 920 DEG C of stage, carbon potential Cp=1.3%, High temperature diffusion stage by force
920 DEG C, carbon potential Cp=0.8%, ooze by force to 70%（About 135min）, diffuse to 98.5%（About 235min）, along with cooling, samming are quenched
Fire, lonneal, the Technology for Heating Processing flow need 1030 minutes altogether, refer to Fig. 4.
Embodiments of the invention group：Carburized (case) depth 1.1mm is set, is oozed by force 920 DEG C of stage, carbon potential Cp=1.3%, high temperature expands
920 DEG C of stage is dissipated, carbon potential Cp=0.8%, is oozed by force to 78%（About 145min）, diffuse to 98.5%（About 155min）, along with cooling,
Samming quenching, lonneal, Technology for Heating Processing flow of the invention need 970 minutes altogether, refer to Fig. 2.
Following table is the testing result of the central gear after above-mentioned different heat treatment technique.
| Group | Effectively hardening Layer/mm | Centre hardness/ HRC | Case hardness/ HRC | Carbide etc. Level | Martensite etc. Level | Retained austenite Grade | Production Cycle |
| Contrast groups one | 0.92 | 42 | 58.5 | 4 grades | 4 grades | 5 grades | 915m in |
| Contrast groups two | 0.98 | 42 | 61.5 | 1 grade | 3 grades | 3 grades | 1030 min |
| Embodiment group | 0.97 | 41 | 60.5 | 1 grade | 3 grades | 3 grades | 970m in |
It is comprehensive considered with reference to above-mentioned experimental data and result, as diffusion time extends to from 80% 78%, 70% mistake always
Journey, final to keep diffusing to 98.5% constant, the centre hardness and case hardness of 17CrNiMo6 material work pieces first increase to be reduced again,
Carbide grade, martensite grade, retained austenite grade in material first significantly reduce, and are then maintained at certain grade model
In enclosing.
With reference to indices of the 17CrNiMo6 sun gears gear after Technology for Heating Processing is improved are detected in table, can draw
To draw a conclusion：Comparatively effective hardness layer and hardness are all more or less the same contrast groups one, but carbide, martensite and residual
The grade relative mistake of austenite is stayed away from larger, it is impossible to meet technical requirements；The indices of contrast groups two all relatively preferably, meet life
Technical requirements are produced, but the production cycle is longer；Consider yield and cost advantage, finally found that changing for embodiments of the invention group
It is the most suitable to enter.
The heat treatment method of a kind of 17CrNiMo6 materials central gear of the present invention, using the carburization process after improvement, control
Gear processed carburazing period and time of diffusion period in carburizing process, reach the purpose for improving yield and saving production capacity.The present invention is not
Only in technical requirements can meet demand, while substantially reduce the production cycle on the premise of quality is guaranteed, improve
Production efficiency, production cost is reduced, and product quality is secure.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only the example for implementing the present invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from the present invention spirit and
In the range of the change and retouching made, belong to the scope of patent protection of the present invention.
Claims (8)
1. a kind of heat treatment method of 17CrNiMo6 materials central gear, it is characterised in that comprise the following steps：
The strong of carburizing process is carried out to 17CrNiMo6 material work pieces in atmosphere furnace and oozes step, maintain in-furnace temperature at 915 DEG C extremely
925 DEG C, carbon potential is in 1.3%Cp, and temperature hold-time was at 135 to 155 minutes；
The high temperature diffusion step of carburizing process is carried out to the workpiece in atmosphere furnace, maintains in-furnace temperature at 915 DEG C to 925 DEG C,
Carbon potential is in 0.8%Cp, and temperature hold-time was at 145 to 165 minutes；
Carburizing process terminate after cooling step, the workpiece is cooled to 820 DEG C with stove, and is kept for 60 to 70 minutes；
Samming quenching Step is carried out to the workpiece, the samming quenching Step is oil quenching, and quenching oil temperature control is at 75 DEG C；
Lonneal step is carried out, wherein temperature control is at 175 DEG C, and the tempering duration was at 180 to 210 minutes.
2. a kind of heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1, it is characterised in that strong
Ooze and in-furnace temperature is maintained in step at 920 DEG C.
A kind of 3. heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1 or 2, it is characterised in that
It is 145 minutes to ooze temperature hold-time in step by force.
4. a kind of heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1, it is characterised in that in gas
Carburizing process processing atmosphere in atmosphere stove is nitrogen, propane and air.
5. a kind of heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1, it is characterised in that in height
In-furnace temperature is maintained in warm diffusing step at 920 DEG C.
A kind of 6. heat treatment method of 17CrNiMo6 materials central gear as described in claim 1 or 5, it is characterised in that
Temperature hold-time is 155 minutes in high temperature diffusion step.
7. a kind of heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1, it is characterised in that dropping
The workpiece is cooled to 820 DEG C with stove and kept for 65 minutes in warm step.
8. a kind of heat treatment method of 17CrNiMo6 materials central gear as claimed in claim 1, it is characterised in that also wrap
Include：The workpiece is come out of the stove after lonneal step air cooling.
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| CN201711482787.XA CN107893152A (en) | 2017-12-29 | 2017-12-29 | A kind of heat treatment method of 17CrNiMo6 materials central gear |
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| CN201711482787.XA CN107893152A (en) | 2017-12-29 | 2017-12-29 | A kind of heat treatment method of 17CrNiMo6 materials central gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115011882A (en) * | 2022-08-08 | 2022-09-06 | 苏州亚太精睿传动科技股份有限公司 | Efficient and energy-saving heat treatment method applied to gear |
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Application publication date: 20180410 |