CN113046527A - Turbine shaft heat treatment method - Google Patents
Turbine shaft heat treatment method Download PDFInfo
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- CN113046527A CN113046527A CN202110331539.5A CN202110331539A CN113046527A CN 113046527 A CN113046527 A CN 113046527A CN 202110331539 A CN202110331539 A CN 202110331539A CN 113046527 A CN113046527 A CN 113046527A
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- turbine shaft
- air cooling
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- heat treatment
- heat treating
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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
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/30—Stress-relieving
-
- 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
- C21D1/78—Combined heat-treatments not provided for above
-
- 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
- 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
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces
Abstract
The invention relates to the technical field of heat treatment, in particular to a heat treatment method for a turbine shaft; the method comprises the following steps: 1) selecting steel, and carrying out primary forging, forging change, drawing and heading processing and forming on the steel to obtain a turbine shaft meeting the requirements; 2) spheroidizing annealing treatment is carried out on the alloy; 3) after water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling; 4) carrying out mechanical rough machining on the turbine shaft treated in the step 3); 5) stress relief annealing; 6) performing mechanical finish machining; the heat treatment process of the turbine shaft has the advantages that the fatigue strength, the wear resistance and the tensile strength are enhanced, and the service life is obviously prolonged; the temperature of the stress relief annealing is 20-30 ℃ below Ac1, the internal stress is partially or completely removed, the deformation and cracking tendency is reduced, the tensile strength, the contact fatigue strength and the elastic limit of the turbine shaft are obviously improved, and the turbine shaft has higher wear resistance, impact toughness, necessary chemical corrosion resistance and the like.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a heat treatment method for a turbine shaft.
Background
The turbine shaft is one of the main parts in a power machine, and its main function is to transmit motion and power. The turbine shaft operates, the inner and outer ferrules and the rolling body are in point contact or line contact, and are subjected to periodic load, and due to the fact that the contact area is small, the contact surface bears extremely large compressive stress and alternating load, the contact stress can reach 2000-5000MPa, the stress alternating frequency can reach tens of thousands of times per minute or even higher, and therefore contact fatigue breakage and replacement of the turbine shaft are easily caused. When the turbine shaft works, relative sliding exists among the rolling bodies, the ring and the retainer, mutual friction is generated, high temperature and high pressure are generated, the atmosphere and the lubricant have certain corrosion effect on the bearing, and the turbine shaft can also be subjected to impact load under certain conditions. Therefore, the turbine shaft needs to have good dimensional stability or structural stability, higher tensile strength, contact fatigue strength and elastic limit, higher wear resistance, impact toughness, necessary chemical corrosion resistance and the like.
The existing turbine shaft generally adopts a heat treatment method of quenching and high-temperature tempering, the quenching mainly aims at improving the strength, the hardness and the wear resistance, the structural steel can obtain better matching of the strength, the plasticity and the toughness after quenching and high-temperature tempering, and the existing heat treatment process of quenching and high-temperature tempering needs to be further improved, so that the forging quality of the turbine shaft is further improved, the tensile strength and the elastic limit of the turbine shaft are improved, and the friction resistance and the impact toughness of the turbine shaft are improved.
Disclosure of Invention
The purpose of the invention is: the heat treatment method for the turbine shaft overcomes the defects in the prior art, and the turbine shaft forged by the heat treatment method has excellent structure stability, higher tensile strength, contact fatigue strength and elastic limit, higher wear resistance, impact toughness, necessary chemical corrosion resistance and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a heat treatment process for a turbine shaft, the heat treatment process comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) spheroidizing annealing treatment is carried out on the alloy;
3) after water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
4) carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing;
6) and (6) performing mechanical finish machining.
Further, the spheroidizing annealing treatment specifically comprises the following steps: heating the steel to 20-30 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling.
Further, the process of the solid solution aging treatment comprises the step of heating the forging to 1040-.
Further, the first air cooling is aging 770 ℃ air cooling for 3.5 hours.
Further, the second air cooling is air cooling at 712 ℃ for 24 hours.
Further, the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
Further, the diameter of the turbine shaft is 20-36 mm.
Further, the cleaning in the step 3) is ultrasonic cleaning.
Further, the carburizing process in the solid solution aging treatment in the step 3) is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly cool the forged piece to 220-280 ℃, and then preserve heat for 1.8-3.2 h to carry out isothermal quenching heat treatment.
Further, the nitrate in the salt tank is 55wt% of potassium nitrate and 45wt% of sodium nitrite.
The technical scheme adopted by the invention has the beneficial effects that:
in the heat treatment process of the turbine shaft, the fatigue strength of the turbine shaft in the examples 1 to 5 is respectively improved by 32%, 35%, 36%, 34% and 33%, the wear resistance and the tensile strength are enhanced, and the service life is obviously prolonged.
The temperature of the stress relief annealing is 20-30 ℃ below Ac1, the internal stress is partially or completely removed, the deformation and cracking tendency is reduced, the tensile strength, the contact fatigue strength and the elastic limit of the turbine shaft are obviously improved, and the turbine shaft has higher wear resistance, impact toughness, necessary chemical corrosion resistance and the like.
After water is cleaned, solid solution aging treatment, primary air cooling and secondary air cooling are sequentially carried out; after the solution treatment, the aging air cooling treatment is carried out for two times, so that various precipitated phases which are not uniformly distributed in the alloy can be fully dissolved into the matrix phase, the solid solution is strengthened, the toughness and the corrosion resistance are improved, the residual stress is eliminated, the continuous processing and forming are facilitated, the preparation is made for the subsequent aging treatment to precipitate the uniformly distributed reinforced phases, the reinforced phases of the high-temperature alloy are uniformly precipitated and precipitated, the carbides and the like are uniformly distributed, and the effects of hardening the alloy and improving the strength of the alloy are realized.
Detailed Description
The present invention will now be described in further detail with reference to specific examples. The following examples are intended to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to limit the scope of the present invention. Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
A heat treatment process for a turbine shaft having a diameter of 20-36mm, comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) spheroidizing annealing treatment is carried out, the main purpose of the spheroidizing annealing treatment is to reduce the hardness and improve the machinability, the preparation is not carried out after quenching, the plastic working and the cutting working are facilitated, and meanwhile, the mechanical toughness can be improved, and the spheroidizing annealing treatment specifically comprises the following steps: heating the steel to 20-30 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling; after the solution treatment, the aging air cooling treatment is carried out for two times, so that various precipitated phases which are not uniformly distributed in the alloy can be fully dissolved into the matrix phase, the solid solution is strengthened, the toughness and the corrosion resistance are improved, the residual stress is eliminated, the continuous processing and forming are facilitated, the preparation is made for the subsequent aging treatment to precipitate the uniformly distributed reinforced phases, the reinforced phases of the high-temperature alloy are uniformly precipitated and precipitated, the carbides and the like are uniformly distributed, and the effects of hardening the alloy and improving the strength of the alloy are realized. The process of the solution and aging treatment comprises the steps of heating the forgings to 1040-1060 ℃, wherein the rotating speed is 400-500r/min, the first air cooling is aging 770 ℃ air cooling for 3.5 hours, and the second air cooling is aging 712 ℃ air cooling for 24 hours. The cleaning is ultrasonic cleaning, and the carburizing process in the solution-aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank to be rapidly cooled to 220-280 ℃ and then to be subjected to isothermal quenching heat treatment for 1.8-3.2 h. The nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) and (3) stress relief annealing is carried out, internal stress is partially or completely removed, and deformation and cracking tendency is reduced, so that the tensile strength, the contact fatigue strength and the elastic limit of the turbine shaft are obviously improved, and the turbine shaft has higher wear resistance, impact toughness, necessary chemical corrosion resistance and the like. The temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
Example 1
A heat treatment process for a turbine shaft having a diameter of 20mm, the heat treatment process comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) the spheroidizing annealing treatment is carried out, and the spheroidizing annealing treatment method specifically comprises the following steps: heating the steel to 20-22 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after ultrasonic water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
the process of the solution and aging treatment comprises the steps of heating the forgings to 1040-,
the carburizing process in the solution aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly reduce the temperature to 220-230 ℃, and then preserve the temperature for 1.8-2.1 h to carry out isothermal quenching heat treatment;
the nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing, wherein the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
Example 2
A heat treatment process for a turbine shaft having a diameter of 24mm, the heat treatment process comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) the spheroidizing annealing treatment is carried out, and the spheroidizing annealing treatment method specifically comprises the following steps: heating the steel to 22-25 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after ultrasonic water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
the process of the solution and aging treatment comprises the steps of heating the forgings to 1040-1060 ℃, rotating speed of 420-450r/min, first air cooling to aging 770 ℃, air cooling for 3.5 hours, second air cooling to aging 712 ℃, air cooling for 24 hours,
the carburizing process in the solution aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly reduce the temperature to 230-240 ℃, and then preserve the temperature for 2.1-2.4 h to carry out isothermal quenching heat treatment;
the nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing, wherein the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
Example 3
A heat treatment process for a turbine shaft having a diameter of 30mm, comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) the spheroidizing annealing treatment is carried out, and the spheroidizing annealing treatment method specifically comprises the following steps: heating the steel to 24-36 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after ultrasonic water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
the process of the solution and aging treatment comprises the steps of heating the forgings to 1040-1060 ℃, rotating speed of 450-460r/min, first air cooling to aging 770 ℃, air cooling for 3.5 hours, second air cooling to aging 712 ℃, air cooling for 24 hours,
the carburizing process in the solution aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly reduce the temperature to 240-260 ℃, and then preserve the temperature for 2.4-2.8 h to carry out isothermal quenching heat treatment;
the nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing, wherein the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
Example 4
A heat treatment process for a turbine shaft having a diameter of 32mm, comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) the spheroidizing annealing treatment is carried out, and the spheroidizing annealing treatment method specifically comprises the following steps: heating the steel to 25-28 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after ultrasonic water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
the process of the solution and aging treatment comprises the steps of heating the forgings to 1040-,
the carburizing process in the solution aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly reduce the temperature to 250-260 ℃, and then preserve the temperature for 2.4-2.8 h to carry out isothermal quenching heat treatment;
the nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing, wherein the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
Example 5
A heat treatment process for a turbine shaft having a diameter of 36mm, the heat treatment process comprising the steps of:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) the spheroidizing annealing treatment is carried out, and the spheroidizing annealing treatment method specifically comprises the following steps: heating the steel to 28-30 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling;
3) after ultrasonic water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
the process of the solution and aging treatment comprises the steps of heating the forgings to 1040-,
the carburizing process in the solution aging treatment is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly reduce the temperature to 260-280 ℃, and then preserve the temperature for 2.8-3.2 h to carry out isothermal quenching heat treatment;
the nitrate in the salt tank was 55wt% potassium nitrate and 45wt% sodium nitrite.
4) Carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing, wherein the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
6) And (3) mechanical finish machining, wherein the mechanical finish machining can obviously improve the matching degree between the turbine shaft and other structures, so that the working abrasion is reduced.
The test method comprises the following steps:
carrying out ultrasonic flaw detection on the turbine shaft forging finished products in the embodiments 1-5 by adopting a flat bottom hole with the diameter of 1.2mm, and carrying out detection: the reflection signals at all parts of the turbine shaft forging are equivalent, and the conclusion is qualified.
The fatigue strength of the steel in the invention is respectively improved by 32%, 35%, 36%, 34% and 33% in the examples 1 to 5, the wear resistance and the tensile strength are enhanced, and the service life is obviously prolonged.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A heat treatment method for a turbine shaft is characterized in that: the heat treatment method comprises the following steps:
1) selecting 0Cr18Ni12Mo2 steel, and carrying out primary forging, forging change, drawing and heading forming on the steel to obtain the turbine shaft meeting the requirements;
2) spheroidizing annealing treatment is carried out on the alloy;
3) after water cleaning, sequentially carrying out solid solution aging treatment, primary air cooling and secondary air cooling;
4) carrying out mechanical rough machining on the turbine shaft treated in the step 3);
5) stress relief annealing;
6) and (6) performing mechanical finish machining.
2. The process for heat treating a turbine shaft of claim 1, wherein: the spheroidizing annealing treatment specifically comprises the following steps: heating the steel to 20-30 ℃ above Ac1, preserving heat for 10-15min, then slowly cooling along with the furnace, cooling to 450 ℃, discharging and air cooling.
3. The process for heat treating a turbine shaft of claim 1, wherein: the process of the solid solution aging treatment comprises the steps of heating the forgings to 1040-1060 ℃, wherein the rotating speed is 400-500 r/min.
4. The process for heat treating a turbine shaft of claim 1, wherein: the first air cooling is the air cooling at the temperature of 770 ℃ for 3.5 hours.
5. The process for heat treating a turbine shaft of claim 1, wherein: the second air cooling is air cooling at 712 ℃ for 24 hours.
6. The process for heat treating a turbine shaft of claim 1, wherein: the temperature of the stress relief annealing is 20-30 ℃ below Ac 1.
7. The process for heat treating a turbine shaft of claim 1, wherein: the diameter of the turbine shaft is 20-36 mm.
8. The process for heat treating a turbine shaft of claim 1, wherein: the cleaning in the step 3) is ultrasonic cleaning.
9. The process for heat treating a turbine shaft of claim 1, wherein: the carburizing process in the solid solution aging treatment in the step 3) is to transfer the forged piece obtained after the treatment in the step 2) into a nitrate tank, quickly cool the forged piece to 220-280 ℃, and then preserve heat for 1.8-3.2 h to carry out isothermal quenching heat treatment.
10. The process for heat treating a turbine shaft of claim 1, wherein: the nitrate in the salt tank is 55wt% of potassium nitrate and 45wt% of sodium nitrite.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888116A (en) * | 2006-08-04 | 2007-01-03 | 钢铁研究总院 | High hardness and high wear resistance no-magnetism bearing steel |
| CN106544600A (en) * | 2016-12-15 | 2017-03-29 | 陆照福 | A kind of Austenitic precipitation-hardening stainless steel forging and its processing method |
| CN108165870A (en) * | 2018-01-19 | 2018-06-15 | 天津荣程联合钢铁集团有限公司 | A kind of steel forgings and its processing method |
| CN108559821A (en) * | 2018-02-09 | 2018-09-21 | 艾普零件制造（苏州）股份有限公司 | A kind of turbine wheel shaft heat treatment method |
| CN109136719A (en) * | 2018-10-10 | 2019-01-04 | 河南工程学院 | A kind of ageing strengthening type Ni-Cr base high-temperature corrosion-resistant alloy and heat treatment method |
| CN111926260A (en) * | 2020-08-24 | 2020-11-13 | 东北大学 | Preparation method of low-magnetism stainless steel medium plate with yield strength of 785MPa |
-
2021
- 2021-03-29 CN CN202110331539.5A patent/CN113046527A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888116A (en) * | 2006-08-04 | 2007-01-03 | 钢铁研究总院 | High hardness and high wear resistance no-magnetism bearing steel |
| CN106544600A (en) * | 2016-12-15 | 2017-03-29 | 陆照福 | A kind of Austenitic precipitation-hardening stainless steel forging and its processing method |
| CN108165870A (en) * | 2018-01-19 | 2018-06-15 | 天津荣程联合钢铁集团有限公司 | A kind of steel forgings and its processing method |
| CN108559821A (en) * | 2018-02-09 | 2018-09-21 | 艾普零件制造（苏州）股份有限公司 | A kind of turbine wheel shaft heat treatment method |
| CN109136719A (en) * | 2018-10-10 | 2019-01-04 | 河南工程学院 | A kind of ageing strengthening type Ni-Cr base high-temperature corrosion-resistant alloy and heat treatment method |
| CN111926260A (en) * | 2020-08-24 | 2020-11-13 | 东北大学 | Preparation method of low-magnetism stainless steel medium plate with yield strength of 785MPa |
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Application publication date: 20210629 |