CN110964889A - Method for heat treatment of 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank - Google Patents
Method for heat treatment of 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank Download PDFInfo
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- CN110964889A CN110964889A CN201911318600.1A CN201911318600A CN110964889A CN 110964889 A CN110964889 A CN 110964889A CN 201911318600 A CN201911318600 A CN 201911318600A CN 110964889 A CN110964889 A CN 110964889A
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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
- C21D1/78—Combined heat-treatments not provided for above
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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Abstract
The invention provides a method for heat treatment of a 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank, which adds a first natural aging before a first artificial aging and adds a second natural aging before a second artificial aging in the prior heat treatment technology, and the natural aging process can fully and uniformly disperse phases precipitated after solid solution of a large blade into a steel matrix, so that the strength of the steel is improved, and various phases are uniformly dispersed and distributed.
Description
Technical Field
The invention belongs to the technical field of heat treatment of metal materials, and particularly relates to a heat treatment method of a 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank.
Background
The prior low-pressure last stage blade of a steam turbine is usually manufactured by using a 05Cr17Ni4Cu4Nb material which has relatively excellent strength and performance parameters after heat treatment and is usually used for manufacturing the low-pressure last stage blade of the steam turbine, the 05Cr17Ni4Cu4Nb material is martensite precipitation hardening stainless steel, and copper in the steel is dispersed and distributed on a substrate in an extremely small and dispersed epsilon phase after solution aging so as to improve the strength.
The low pressure last stage blade is typically a large blade with a steam path length greater than 750 mm. The size of the blade is generally subjected to heat treatment by adopting a solid solution process, a primary artificial aging process and a secondary artificial aging process according to standard process requirements, and the process is used for a large-sized low-pressure last-stage blade and can cause the phenomena of proper hardness, lower strength than a standard value and unmatched strength and hardness.
Disclosure of Invention
The invention aims to provide a method for heat treatment of a 05Cr17Ni4Cu4Nb steam turbine final stage blade blank, which can prevent the unqualified physicochemical data of the low-pressure final stage blade after heat treatment, reduce the repair frequency and reduce the batch production cost of the steam turbine final stage blade blank.
The invention provides a heat treatment method of a 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank, which comprises the following steps:
step one, solution treatment, namely heating a 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to a solution temperature, and cooling to room temperature;
step two, natural aging for one time, namely placing the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank cooled to room temperature in room temperature for a first preset time;
step three, carrying out primary artificial aging treatment, namely carrying out primary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to primary natural aging treatment, and cooling to room temperature;
step four, secondary natural aging, namely placing the 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank subjected to the primary artificial aging treatment at room temperature for a second preset time;
and step five, secondary artificial aging treatment, namely performing secondary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to secondary natural aging treatment, and cooling to room temperature.
Optionally, the heating the 05Cr17Ni4Cu4Nb steam turbine low-pressure last stage blade blank to a solid solution temperature, and cooling to room temperature includes:
heating the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to a solid solution temperature, preserving heat for 1-3 h, and cooling to room temperature.
Optionally, the solid solution temperature is 1025-1050 ℃.
Optionally, the solid solution temperature is 1025 ℃, 1030 ℃, 1040 ℃ or 1050 ℃.
Optionally, the cooling mode in the first step is air cooling or oil cooling.
Optionally, the step of performing artificial aging treatment on the first naturally aged 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank, and cooling to room temperature includes:
and (3) preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to the primary natural aging at the temperature of 815 +/-5 ℃ for 2-3 h, and cooling to room temperature.
Optionally, the step of performing secondary artificial aging treatment on the 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank subjected to secondary natural aging treatment, and cooling to room temperature includes:
and (3) preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to secondary natural aging at the temperature of 550-570 ℃ for 8-10 h.
Optionally, the cooling mode in the third and fifth steps is air cooling.
Optionally, the first preset time period and the second preset time period are not less than 12 hours.
The heat treatment method of the low-pressure final stage blade blank of the steam turbine increases the primary natural aging before the primary artificial aging and increases the secondary natural aging before the secondary artificial aging in the prior art, and the natural aging increasing process can fully and uniformly disperse the precipitated phase of the large-sized blade after solid solution into a steel matrix, so that the strength of the steel is improved, and various phases are uniformly dispersed and distributed. The invention can lead various strengthening phases to be evenly dispersed and distributed through two times of natural aging and two times of artificial aging as far as possible, and lead the strength to be matched with the hardness.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments.
The invention provides a heat treatment method of a 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank, which comprises the following steps:
step one, solution treatment, namely heating a 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to a solution temperature, and cooling to room temperature;
step two, natural aging for one time, namely placing the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank cooled to room temperature in room temperature for a first preset time;
step three, carrying out primary artificial aging treatment, namely carrying out primary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to primary natural aging treatment, and cooling to room temperature;
step four, secondary natural aging, namely placing the 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank subjected to the primary artificial aging treatment at room temperature for a second preset time;
and step five, secondary artificial aging treatment, namely performing secondary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to secondary natural aging treatment, and cooling to room temperature.
In the first step, the solid solution process comprises the following specific steps: heating the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to 1025-1050 ℃, and preserving the temperature for 1-3 h, wherein the temperature of the solution treatment is 1025 ℃, 1030 ℃, 1040 ℃ and 1050 ℃, for example.
In the first step, the cooling mode is one of air cooling or oil cooling. The cooling speed of air cooling can be more than 14 ℃/min.
In the first step, the specific process of the one-time artificial aging treatment is as follows: and (3) preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to primary natural aging at the temperature of 815 +/-5 ℃ for 2-3 h, wherein the temperature of primary artificial aging heat treatment is 810 ℃, 815 ℃, 820 ℃, and the time for preserving the temperature is 2h and 3 h.
In the fifth step, the secondary artificial aging specifically comprises the step of preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to the secondary natural aging at the temperature of 550-570 ℃ for 8-10 h, for example, the temperature of the secondary artificial aging treatment is 550 ℃, 560 ℃, 565 ℃ and 570 ℃, and the preserving time is 8h, 9h and 10 h.
Optionally, the first preset time period and the second preset time period are not less than 12 hours.
The invention has the beneficial effects that: the dispersed phases of the large blade are uniformly distributed by respectively adding natural aging treatment after the solution treatment and the primary artificial aging treatment, so that the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank meets the standard mechanical property requirement after the heat treatment.
The heat treatment method provided by the present invention will be described below by changing the time length of two natural aging times using several specific examples.
Conventional process
A test is carried out by adopting a low-pressure stage 6 moving blade blank, firstly carrying out solution treatment, namely placing the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank on a universal heat treatment charging plate, then placing the blank into a high-temperature box type resistivity, heating to 1040 ℃, preserving heat for 3h, then cooling to room temperature, then carrying out artificial aging (preserving heat for 3h at 815 ℃) once, and air cooling to room temperature. Then carrying out secondary artificial aging (keeping the temperature at 565 ℃ for 8 hours), and cooling the mixture to room temperature in air.
Example 1
A test is carried out by adopting a low-pressure stage 6 moving blade blank, firstly, the solution heat treatment is carried out, namely, the 5Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank is placed on a universal heat treatment charging plate, the universal heat treatment charging plate is placed in a high-temperature box type resistivity to be heated to 1040 ℃, the temperature is kept for 3h, then the universal heat treatment charging plate is cooled to room temperature, then the natural aging is carried out for 8h, then the artificial aging is carried out for 3h at 815 ℃, the air cooling is carried out to the room temperature, then the natural aging is carried out for 8h, then the artificial aging is carried out for two times (the heat preservation.
Example 2
A test is carried out by adopting a low-pressure stage 6 moving blade blank, firstly, the solution heat treatment is carried out, namely, the 5Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank is placed on a universal heat treatment charging plate, the universal heat treatment charging plate is placed in a high-temperature box type resistivity to be heated to 1040 ℃, the temperature is kept for 3h, then the universal heat treatment charging plate is cooled to room temperature, then the natural aging is carried out for 10h, then the artificial aging is carried out for 3h at 815 ℃, the air cooling is carried out to the room temperature, then the natural aging is carried out for 10h again, then the artificial aging is carried out for two times (the heat.
Example 3
A test is carried out by adopting a low-pressure stage 6 moving blade blank, firstly, the solution heat treatment is carried out, namely, the 5Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank is placed on a universal heat treatment charging plate, the universal heat treatment charging plate is placed in a high-temperature box type resistivity to be heated to 1040 ℃, the temperature is kept for 3h, then the universal heat treatment charging plate is cooled to room temperature, then the natural aging is carried out for 12h, then the artificial aging is carried out for 3h at 815 ℃, the air cooling is carried out to the room temperature, then the natural aging is carried out for 12h, then the artificial aging is carried out for two times (the heat preservation.
Example 4
A test is carried out by adopting a low-pressure 6-stage moving blade blank, firstly, the solution heat treatment is carried out, namely, the 5Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank is placed on a universal heat treatment charging plate, the universal heat treatment charging plate is placed in a high-temperature box type resistivity to be heated to 1040 ℃, the temperature is kept for 3h, then the universal heat treatment charging plate is cooled to room temperature, then the natural aging is carried out for 24h, then the artificial aging is carried out for 3h at 815 ℃, the air cooling is carried out to the room temperature, then the natural aging is carried out for 24h, then the artificial aging is carried out for two times (the.
The properties of the heat treated 5Cr17Ni4Cu4Nb turbine low pressure final stage blade blank obtained from each of the above tests are shown in Table 1 below.
TABLE 1
From the above examples and the data in table 1, it can be seen that the tensile and yield strength of the blade can be increased without much change in hardness by increasing the natural aging twice compared to the conventional heat treatment method.
Claims (9)
1. A method for heat treatment of a 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank is characterized by comprising the following steps:
step one, solution treatment, namely heating a 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to a solution temperature, and cooling to room temperature;
step two, natural aging for one time, namely placing the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank cooled to room temperature in room temperature for a first preset time;
step three, carrying out primary artificial aging treatment, namely carrying out primary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to primary natural aging treatment, and cooling to room temperature;
step four, secondary natural aging, namely placing the 05Cr17Ni4Cu4Nb steam turbine low-pressure final stage blade blank subjected to the primary artificial aging treatment at room temperature for a second preset time;
and step five, secondary artificial aging treatment, namely performing secondary artificial aging treatment on the 05Cr17Ni4Cu4Nb turbine low-pressure final-stage blade blank subjected to secondary natural aging treatment, and cooling to room temperature.
2. The method of claim 1, wherein said heating 05Cr17Ni4Cu4Nb steam turbine low pressure last stage blade blank to solution temperature and cooling to room temperature comprises:
heating the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank to a solid solution temperature, preserving heat for 1-3 h, and cooling to room temperature.
3. The method according to claim 2, wherein the solid solution temperature is in the range of 1025 to 1050 ℃.
4. The method according to claim 3, characterized in that the solutionizing temperature is 1025 ℃, 1030 ℃, 1040 ℃ or 1050 ℃.
5. The method of claim 1, wherein the cooling in the first step is air cooling or oil cooling.
6. The method according to claim 1, wherein said subjecting the once naturally aged 05Cr17Ni4Cu4Nb turbine low pressure last stage blade blank to an artificial aging treatment to cool to room temperature comprises:
and (3) preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to the primary natural aging at the temperature of 815 +/-5 ℃ for 2-3 h, and cooling to room temperature.
7. The method of claim 1, wherein said secondary artificially aging of a secondary naturally aged 05Cr17Ni4Cu4Nb steam turbine low pressure last stage blade blank to cool to room temperature comprises:
and (3) preserving the temperature of the 05Cr17Ni4Cu4Nb turbine low-pressure final stage blade blank subjected to secondary natural aging at the temperature of 550-570 ℃ for 8-10 h.
8. The method of claim 1, wherein the cooling in steps three and five is air cooling.
9. The method of claim 1, wherein the first and second predetermined periods of time are not less than 12 hours.
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Citations (4)
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|---|---|---|---|---|
| JPH0718387A (en) * | 1993-07-05 | 1995-01-20 | Nkk Corp | Precipitation hardening type stainless steel excellent in wear resistance and production of precipitation hardening type stainless steel |
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| CN110273055A (en) * | 2018-03-16 | 2019-09-24 | 国电锅炉压力容器检验中心 | A kind of steam turbine alloy bolt heat treatment method |
| CN110484826A (en) * | 2019-09-24 | 2019-11-22 | 成都先进金属材料产业技术研究院有限公司 | 05Cr17Ni4Cu4Nb martensitic stain less steel and its heat-treatment technology method |
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- 2019-12-19 CN CN201911318600.1A patent/CN110964889B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0718387A (en) * | 1993-07-05 | 1995-01-20 | Nkk Corp | Precipitation hardening type stainless steel excellent in wear resistance and production of precipitation hardening type stainless steel |
| CN105648175A (en) * | 2015-12-31 | 2016-06-08 | 无锡透平叶片有限公司 | Heat treatment method capable of increasing first pass yield of 0Cr17Ni4Cu4Nb stainless steel material and application thereof |
| CN110273055A (en) * | 2018-03-16 | 2019-09-24 | 国电锅炉压力容器检验中心 | A kind of steam turbine alloy bolt heat treatment method |
| CN110484826A (en) * | 2019-09-24 | 2019-11-22 | 成都先进金属材料产业技术研究院有限公司 | 05Cr17Ni4Cu4Nb martensitic stain less steel and its heat-treatment technology method |
Non-Patent Citations (1)
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