CN107937703B - Preparation heat treatment process of 35CrMoV ion nitriding gear for compressor - Google Patents
Preparation heat treatment process of 35CrMoV ion nitriding gear for compressor Download PDFInfo
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- CN107937703B CN107937703B CN201711058097.1A CN201711058097A CN107937703B CN 107937703 B CN107937703 B CN 107937703B CN 201711058097 A CN201711058097 A CN 201711058097A CN 107937703 B CN107937703 B CN 107937703B
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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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
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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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
- C23C8/02—Pretreatment of the material to be coated
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- 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
- C23C8/36—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 using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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Abstract
The invention provides a preparation heat treatment process method of a 35CrMoV ion nitriding gear for a compressor, which comprises the process steps of improving the design of a rough machining drawing, normalizing, quenching, tempering, stabilizing and the like. The 35CrMoV ion nitriding preliminary heat treatment process method for the compressor provided by the invention has the advantages that the hardness of the 35CrMoV gear reaches HB303-341 by optimizing process parameters and improving the design of a rough machining diagram, the allowable yield strength of the gear can be improved by 33.6 percent and the allowable bending stress can be improved by 10 percent according to the American AGMA gear standard, the allowable contact stress is improved from 2 grade to 3 grade, the allowable contact stress is improved by about 10 percent, and the requirement of a minimum hardened layer is reduced by 16.7 percent. The bearing capacity of the gear is greatly improved, the contact fatigue strength and the bending fatigue are greatly improved, the surface strengthening treatment of a part of carburized and quenched gear can be replaced, and the distortion problem of the carburized and quenched gear is avoided.
Description
Technical Field
The invention relates to the technical field of gear heat treatment, in particular to a preparation heat treatment process of a 35CrMoV ion nitriding gear for a compressor.
Background
At present, the preheating treatment process of the 35CrMoV gear for the centrifugal compressor of the turbine is normalizing, quenching and tempering treatment, and the treated core has the yield strength of more than or equal to 735MPa and the hardness of HB 269-302. In order to improve the bearing capacity and the fatigue life of a gear, the patent applied in 2015 improves the core performance to the conditions that the yield strength is more than or equal to 833MPa and the hardness is HB 293-341; in order to further excavate the potential of a 35CrMoV material and be suitable for the development of a fan technology, the hardness of a 35CrMoV gear reaches HB303-341 by improving and optimizing the design of a rough machining diagram, the hardness value tends to be on-line, the comprehensive mechanical property of the pretreated core is more stable, and the ionic nitriding gear subjected to the preliminary heat treatment of the invention can improve the allowable yield strength of the gear by 33.6 percent, the allowable bending stress by 10 percent, the allowable contact stress from 2 grade to 3 grade and by about 10 percent and the requirement of the minimum hardened layer by 16.7 percent according to the American AGMA gear standard. The bearing capacity of the gear is greatly improved, the contact fatigue strength and the bending fatigue are greatly improved, the surface strengthening treatment of part of the carburized and quenched gear can be replaced, the distortion problem of the carburized and quenched gear is avoided, and the application range of the ion nitriding gear is greatly expanded.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preliminary heat treatment process of a 35CrMoV ion nitriding gear for a compressor, which is used for excavating the potential of a 35CrMoV material and improving the bearing capacity of the 35CrMoV ion nitriding gear for the compressor.
In order to solve the technical problem, the invention provides a preparation heat treatment process of a 35CrMoV ion nitriding gear for a compressor, which comprises the following steps:
designing a rough machining drawing, namely retracting the mechanical property test ring by 50-100mm at the excircle of the side face of the gear and cutting;
normalizing at 900-910 deg.C, charging at or below 500 deg.C, heating at a rate of not more than 100 deg.C per hour, keeping the temperature at the normalized temperature for 40 mm/effective thickness, air cooling, and dispensing;
quenching treatment, wherein the quenching temperature is 900 ℃, the furnace temperature is equal to or lower than 500 ℃, charging is carried out, the temperature is increased at the speed of not more than 100 ℃ per hour, and the quenching heat preservation time is calculated according to the effective thickness/40 mm hour; transferring time from quenching of the workpiece to quenching of a cooling medium is not more than 30 seconds, cooling the workpiece with the effective thickness of less than 80mm by adopting oil, wherein the oil cooling temperature is 40-80 ℃, cooling the workpiece with the effective thickness of 80mm-130mm by adopting water-based quenching liquid, and then transferring to oil for cooling, the cooling temperature of the water-based quenching liquid is less than 40 ℃, the cooling time of the water-based quenching liquid is calculated according to the effective thickness of every 1 millimeter and 1 second, cooling the workpiece with the effective thickness of more than 130mm by adopting water and then transferring to oil for cooling, the water cooling temperature is less than 40 ℃, and the water cooling time is calculated according to the effective thickness of every 1;
tempering treatment, wherein the tempering temperature is 600 +/-10 ℃, the furnace temperature is below 350 ℃, charging is carried out, the temperature is increased at the speed of not more than 70 ℃ per hour, the heat preservation time is calculated according to 1.5-2 times of quenching heat preservation time, and then air cooling is carried out;
stabilizing at 570 deg.C, charging at 300 deg.C, heating at 70 deg.C or less per hour, holding for the same time as tempering, cooling at 50 deg.C or less per hour, cooling to 250 deg.C, and air cooling.
Furthermore, in the quenching treatment, when charging, workpieces with the diameter larger than 1000mm or the effective thickness larger than 130mm are placed according to the interval between the upper layer and the lower layer of one layer of workpieces or two workpieces on each tray, which is 2 times larger than the thickness of the workpieces.
Further, in the tempering treatment, the tempering furnace is provided with a stirring fan, so that the uniformity of the furnace temperature is kept within a range of +/-10 ℃.
Further, the tempering temperature is adjusted within the range of 600 +/-10 ℃ according to the chemical composition of the 35CrMoV ion nitriding gear material, the effective size and volume coefficient of the workpiece and the quenching and charging condition.
Further, the stabilizing treatment is performed after the semi-finishing of the workpiece is completed.
Furthermore, the Brinell hardness value of the 35CrMoV ion nitriding gear after the preliminary heat treatment is HB303-341, and the tensile strength is not less than 900 MPa.
Further, the chemical composition of the 35CrMoV ion nitriding gear material meets the regulation of GB/T3077-1999 standard.
Further, the preliminary heat treatment process is suitable for 35CrMoV ion nitriding gears for turbine centrifugal compressors.
The invention provides a preliminary heat treatment process of a 35CrMoV ion nitriding gear for a compressor, which is characterized in that the hardness of the 35CrMoV gear reaches HB303-341 by optimizing process parameters and improving the design of a rough machining drawing, the allowable yield strength of the gear is improved by 33.6 percent and the allowable bending stress is improved by 10 percent according to the American AGMA gear standard, the allowable contact stress is improved from 2 grade to 3 grade, the allowable contact stress is improved by about 10 percent, and the requirement of a minimum hardened layer is reduced by 16.7 percent. The bearing capacity of the gear is greatly improved, the contact fatigue strength and the bending fatigue are greatly improved, the surface strengthening treatment of a part of carburized and quenched gear can be replaced, and the distortion problem of the carburized and quenched gear is avoided. The preliminary heat treatment process of the 35CrMoV ion nitriding gear for the compressor, provided by the invention, can be used on the 35CrMoV gear or a gear ring for a centrifugal compressor, and can also be used on other workpieces which are subjected to ion nitriding heat treatment by using 35CrMoV materials.
Drawings
FIG. 1 is a drawing of a cutting position of a mechanical property test ring of an ion nitriding gear in embodiment 1 of the present invention;
FIG. 2 is a drawing showing a cutting position of a mechanical property test ring of an ion nitrided gear according to comparative example 1 of the present invention;
FIG. 3 is a drawing of a cutting position of a mechanical property test ring of an ion nitriding gear in embodiment 2 of the present invention;
FIG. 4 is a drawing showing the cutting position of the mechanical property test ring of the ion nitrided gear according to the present invention in comparative example 2;
FIG. 5 is a simplified diagram of the AGMA standard showing a 33.6% increase in allowable yield strength of a gear after being subjected to a preparatory heat treatment process according to an embodiment of the present invention;
FIG. 6 is a simplified diagram of the AGMA standard showing 10-44.9% improvement in allowable bending stress of a gear after the pre-heat treatment process provided by an embodiment of the present invention;
FIG. 7 is a simplified diagram of the AGMA standard for increasing the allowable contact stress of a gear after the pre-heat treatment process according to an embodiment of the present invention by one level;
fig. 8 is a simplified diagram of the AGMA standard with a 16.7% reduction in the depth of the minimum hardened layer of the gear after the pre-heat treatment process according to an embodiment of the present invention.
Detailed Description
The invention discloses a preliminary heat treatment process of a 35CrMoV ion nitriding gear for a compressor, wherein the chemical components of the 35CrMoV ion nitriding gear meet the requirements of GB/T3077-1999 standard, and the process is particularly suitable for the preliminary heat treatment of the 35CrMoV ion nitriding gear for a centrifugal turbine compressor and comprises the following steps:
(1) and designing a rough machining diagram, wherein when the rough machining diagram is designed, the mechanical property test ring is cut from the top excircle of the side surface, and is improved to be cut by retracting 50-100mm from the excircle of the side surface, so that the strength and hardness of the gear working part after the preliminary heat treatment can be further ensured to meet the requirements of design and industrial and mining.
(2) Normalizing at 900 deg.C, charging at a furnace temperature lower than 500 deg.C, heating at a rate of not higher than 100 deg.C per hour, keeping the temperature for 40 mm/effective thickness, and air cooling.
(3) Quenching treatment, wherein the quenching temperature is 900 ℃, the furnace temperature is equal to or lower than 500 ℃, charging is carried out, the temperature is increased at the speed of not higher than 100 ℃ per hour, the heat preservation time is calculated according to the effective thickness/40 mm hour, and the workpiece with the effective thickness of less than 80mm is cooled by oil; the workpiece with the effective thickness of 80mm-150mm is cooled by water-based quenching liquid1Second (T)1Calculated as 1 second per mm of effective thickness) and then oil-cooled; the effective thickness of the workpiece is more than 150mm by adopting water-cooling T2Second (T)2Calculated as 1 second per mm of effective thickness) and then oil cooled. The diameter is more than 1000mm or the effective thickness is more than 120mm, and each tray is only provided with one layer of workpieces or the interval between the upper layer and the lower layer of two workpieces is more than 2 times of the thickness of the workpieces;
(4) tempering treatment, namely charging the steel at the tempering temperature of 600 ℃ and the furnace temperature of below 350 ℃, raising the temperature at the speed of not higher than 70 ℃ per hour, calculating the heat preservation time according to 1.5 times of quenching heat preservation time, and then air cooling; moreover, the temperature uniformity of the tempering furnace is ensured within the range of plus or minus 10 ℃.
(5) And (3) stabilizing treatment, namely performing stabilizing treatment after semi-finishing, charging at the temperature of 580 ℃, at the furnace temperature of below 300 ℃, raising the temperature at the speed of not higher than 70 ℃ per hour, keeping the temperature for the time according to the tempering, cooling at the speed of not higher than 50 ℃ per hour, cooling to 250 ℃, discharging and air cooling.
The preliminary heat treatment process of the 35CrMoV ion nitriding gear for the compressor provided by the present invention will be described in detail with reference to the following embodiments.
Example 1
The 35CrMoV toothed ring material for the centrifugal compressor of the turbine comprises the following chemical components: 0.34 wt% of C; si: 0.25 wt%; mn: 0.58 wt%; cr: 1.09 wt%; mo: 0.23 wt%; s: 0.008 wt%; p: 0.026 wt%; v: 0.13 wt%; fe: and (4) the balance. Carrying out ion nitriding heat treatment on the alloy, comprising the following steps:
(1) and (3) designing a rough machining diagram, referring to fig. 1, improving the rough machining diagram, and cutting a mechanical property test ring by retracting 100mm on the outer circle of the side surface of the gear so as to further ensure that the strength and hardness of the gear working part after the preliminary heat treatment meet the requirements of design and industrial and mining.
(2) Normalizing, charging at room temperature, heating to 500 deg.C, heating to 100 deg.C per hour, holding at 900 deg.C for 3.5 hr, discharging, and air cooling.
(3) Quenching treatment, charging at room temperature, heating to 500 ℃ according to power, then heating to 900 ℃ according to 100 ℃ per hour, preserving heat for 3.5 hours at 900 ℃, then cooling by water-based quenching liquid for 140 seconds, transferring to oil for cooling, and separating the upper layer from the lower layer by 280 mm.
(4) Tempering, charging at room temperature, heating to 350 deg.C, heating to 70 deg.C per hour, keeping the temperature at 600 deg.C for 5.5 hr, and air cooling. Then, mechanical property test is carried out, and the test result is shown in table 1.
(5) And (3) stabilizing treatment: charging at 300 deg.C, heating at 70 deg.C per hour, maintaining at 570 deg.C for 5.5 hr, cooling at 50 deg.C per hour, cooling to 200 deg.C, and air cooling.
Comparative example 1
The difference from the embodiment 1 is that: referring to fig. 2, in the design of the rough machining diagram in the step (1), the mechanical property test ring is cut at the top excircle of the side surface; no dispersion requirement exists after the furnace is discharged in the step (2); and (3) directly performing oil quenching without the requirement of the interval between an upper layer and a lower layer. Then, mechanical property test is carried out, and the test result is shown in Table 2.
As can be seen from the comparison of the test results in tables 1 and 2, the 35CrMoV gear after the ion nitriding heat treatment of the test example 1 has the following core mechanical property indexes: the yield strength, tensile strength, brinell hardness, elongation, reduction of area, impact absorption energy and other indexes were all higher than those of comparative example 1. This shows that the preliminary heat treatment process of the 35CrMoV ion nitriding gear for the compressor provided by the embodiment 1 of the present invention greatly improves the bearing capacity of the 35CrMoV ion nitriding gear after the preliminary heat treatment, and also greatly improves the contact fatigue strength and the bending fatigue by optimizing the process parameters and improving the design of the rough machining diagram.
TABLE 1 mechanical Properties data of example 1
| Numbering | Yield strength | Tensile strength | Elongation percentage | Reduction of area | Impact work (J) | HB |
| Example 1 | 865MPa | 997MPa | 17.5 | 64 | 78、72 | 306 |
Mechanical property data of Table 2, comparative example 1
| Numbering | Yield strength | Tensile strength | Elongation percentage | Reduction of area | Impact work (J) | HB |
| Comparative example 1 | 842MPa | 962MPa | 17.0 | 66 | 62、72 | 302 |
Example 2
The 35CrMoV gear material for the turbo compressor comprises the following chemical components: 0.34 wt% of C; si: 0.25 wt%; mn: 0.58 wt%; cr: 1.09 wt%; mo: 0.23 wt%; s: 0.008 wt%; p: 0.026 wt%; v: 0.13 wt%; fe: and (4) the balance. Carrying out ion nitriding heat treatment on the alloy, comprising the following steps:
(1) and (3) designing a rough machining diagram, referring to fig. 3, improving the rough machining diagram, and cutting a mechanical property test ring by retracting 50mm on the outer circle of the side surface of the gear so as to further ensure that the strength and hardness of the gear working part after the preliminary heat treatment meet the requirements of design and industrial and mining.
(2) Normalizing, charging at room temperature, heating to 500 deg.C, heating to 100 deg.C per hour, holding at 900 deg.C for 3 hr, discharging, and air cooling.
(3) Quenching treatment, charging at room temperature, heating to 500 ℃ according to power, then heating to 100 ℃ per hour, keeping the temperature at 900 ℃ for 3 hours, then cooling by water-based quenching liquid for 120 seconds, turning to oil cooling, and charging the upper layer and the lower layer at an interval of 240 mm.
(4) Tempering, charging at room temperature, heating to 350 deg.C, heating to 70 deg.C per hour, keeping the temperature at 600 deg.C for 4.5 hr, and air cooling. Then, mechanical property test is carried out, and the test result is shown in Table 3.
(5) And (3) stabilizing treatment: the stabilizing treatment is carried out after the semi-finishing treatment, the stabilizing treatment temperature is 570 ℃, the charging temperature is 300 ℃, the temperature is increased at the speed of 70 ℃ per hour, the temperature is maintained at 570 ℃ for 4.5 hours, the temperature is reduced at the speed of 50 ℃ per hour, and the temperature is reduced to 200 ℃ for discharging and air cooling.
Comparative example 2
The difference from the embodiment 2 is that: referring to fig. 4, in the design of the rough machining diagram in the step (1), the mechanical property test ring is cut at the top excircle of the side surface; no dispersion requirement exists after the furnace is discharged in the step (2); and (3) directly performing oil quenching without the requirement of the interval between an upper layer and a lower layer. Then, mechanical property test was performed, and the test results are shown in Table 4.
From the comparison of the test results in tables 3 and 4, it can be seen that the 35CrMoV gear after the ion nitriding heat treatment of test example 2 has the following core mechanical property indexes: the yield strength, tensile strength, Brinell hardness, elongation, reduction of area, impact absorption energy and the like are all obviously higher than the indexes of the comparative example 2, such as yield strength, tensile strength, Brinell hardness, elongation, reduction of area, impact absorption energy and the like. This shows that the preliminary heat treatment process of the 35CrMoV ion nitriding gear for the compressor provided in embodiment 2 of the present invention greatly improves the bearing capacity of the 35CrMoV ion nitriding gear after the preliminary heat treatment, and greatly improves the contact fatigue strength and the bending fatigue by optimizing the process parameters and improving the design of the rough machining drawing.
Mechanical property data of table 3 and example 2
Mechanical property data of Table 4, comparative example 2
| Numbering | Yield strength | Tensile strength | Elongation percentage | Reduction of area | Impact work (J) | HB |
| Comparative example 2 | 833 | 970 | 15.5 | 62 | 47、52 | 293 |
The invention provides a preliminary heat treatment process of a 35CrMoV ion nitriding gear for a compressor, which enables the hardness of the 35CrMoV gear after preliminary heat treatment to reach HB303-341 by improving and optimizing process parameters and optimizing the design of a rough machining drawing, and can be widely applied to aspects such as a turbine compressor ion nitriding gear or a gear ring. Referring to fig. 5, 6, 7 and 8, according to the american AGMA gear standard, the allowable yield strength of the gear is increased by 33.6%, the allowable bending stress is increased by 10%, the allowable contact stress is increased from 2 to 3, and is increased by about 10%, and the requirement for the depth of the minimum hardened layer can be reduced by 16.7%, so that the bearing capacity of the 35CrMoV ion nitrided gear is greatly improved, the contact fatigue strength and the bending fatigue are greatly improved, and the application range of the ion nitrided gear is greatly expanded.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. The preparation heat treatment process of the 35CrMoV ion nitriding gear for the compressor is characterized by comprising the following steps of:
designing a rough machining diagram, namely retracting the mechanical property test ring by 50-100mm at the excircle of the side face of the gear and cutting;
normalizing at 900-910 deg.C, charging at or below 500 deg.C, heating at a rate of not more than 100 deg.C per hour, keeping the normalizing temperature for 40 mm/workpiece thickness, air cooling, and dispensing;
quenching treatment, wherein the quenching temperature is 900 ℃, the furnace temperature is equal to or lower than 500 ℃, charging is carried out, the temperature is increased at the speed of not more than 100 ℃ per hour, and the quenching heat preservation time is calculated according to the workpiece thickness/40 mm hour; transferring time from quenching of the workpiece to quenching of a cooling medium is not more than 30 seconds, cooling the workpiece with the thickness of less than 80mm by adopting oil, wherein the oil cooling temperature is 40-80 ℃, cooling the workpiece with the thickness of 80mm-130mm by adopting water-based quenching liquid, then transferring to oil for cooling, the cooling temperature of the water-based quenching liquid is less than 40 ℃, the cooling time of the water-based quenching liquid is calculated according to the thickness of the workpiece per 1 mm and 1 second, cooling the workpiece with the thickness of more than 130mm by adopting water, then transferring to oil for cooling, the water cooling temperature is less than 40 ℃, and the water cooling time is calculated according to the thickness of the workpiece per 1.5;
tempering treatment, wherein the tempering temperature is 600 +/-10 ℃, the furnace temperature is below 350 ℃, charging is carried out, the temperature is increased at the speed of not more than 70 ℃ per hour, the heat preservation time is calculated according to 1.5-2 times of quenching heat preservation time, and then air cooling is carried out;
stabilizing at 570 deg.c, charging at 300 deg.c, raising temperature at 70 deg.c or less per hour, maintaining for the same time as tempering, cooling at 50 deg.c or less per hour, cooling to 250 deg.c and air cooling;
the Brinell hardness value of the 35CrMoV ion nitriding gear subjected to the preliminary heat treatment is HB303-341, and the tensile strength is not less than 900 MPa.
2. The pre-heat treatment process of 35CrMoV ion nitrided gears for compressors according to claim 1, characterized by: in the quenching treatment, when the workpieces with the diameter larger than 1000mm or the thickness larger than 130mm are charged, the workpieces are arranged according to the interval between the upper layer and the lower layer of each tray, or the interval between the upper layer and the lower layer of each tray is 2 times larger than the thickness of the workpieces.
3. The pre-heat treatment process of 35CrMoV ion nitrided gears for compressors according to claim 1, characterized by: in the tempering treatment, the tempering furnace is provided with a stirring fan, so that the uniformity of the furnace temperature is kept within the range of +/-10 ℃.
4. The pre-heat treatment process of 35CrMoV ion nitrided gears for compressors according to claim 3, characterized by: the tempering temperature is adjusted within the range of 600 +/-10 ℃ according to the chemical components of the 35CrMoV ion nitriding gear material, the effective size and volume coefficient of the workpiece and the quenching and charging conditions.
5. The pre-heat treatment process of 35CrMoV ion nitrided gears for compressors according to claim 1, characterized by: the stabilizing treatment is carried out after the semi-finishing of the workpiece is finished.
6. The pre-heat treatment process of 35CrMoV ion nitrided gears for compressors according to claim 1, characterized by: the chemical composition of the 35CrMoV ion nitriding gear material meets the regulation of GB/T3077-1999 standard.
7. The preliminary heat treatment process of 35CrMoV ion nitrided gears for compressors according to any of claims 1 to 6, characterized by: the preheating treatment process is suitable for 35CrMoV ion nitriding gears for turbine centrifugal compressors.
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| CN112553419B (en) * | 2020-10-27 | 2022-10-14 | 沈阳透平机械股份有限公司 | Critical heat treatment method for martensite alloy steel welded impeller |
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| JP2012125838A (en) * | 2010-12-15 | 2012-07-05 | Kawakami Tekkosho:Kk | Method for producing hot-forged product for case hardened steel |
| CN104911607A (en) * | 2014-03-11 | 2015-09-16 | 沈阳透平机械股份有限公司 | Compressor 38CrMoAl steel treatment technology |
| CN106893822B (en) * | 2015-12-18 | 2019-03-19 | 沈阳透平机械股份有限公司 | Centrifugal compressor is covered with 35CrMoV tooth or the ionic nitriding heat treatment process of ring gear |
| CN107299202B (en) * | 2017-05-16 | 2019-06-28 | 沈阳透平机械股份有限公司 | The conditioning treatment process choice method of carburizing and quenching gear anti-distortion |
| CN107119177B (en) * | 2017-05-16 | 2019-07-12 | 沈阳透平机械股份有限公司 | The carburizing and quenching surface intensified technique of turbocompressor 12Cr2Ni4 high gear |
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