CN114350910A - Pre-heat treatment method for refining grain size of 30Si2MnCrMoVE ultrahigh-strength alloy steel forging - Google Patents
Pre-heat treatment method for refining grain size of 30Si2MnCrMoVE ultrahigh-strength alloy steel forging Download PDFInfo
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- CN114350910A CN114350910A CN202111667990.0A CN202111667990A CN114350910A CN 114350910 A CN114350910 A CN 114350910A CN 202111667990 A CN202111667990 A CN 202111667990A CN 114350910 A CN114350910 A CN 114350910A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005242 forging Methods 0.000 title claims abstract description 27
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 22
- 238000007670 refining Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
In order to overcome the problems in the prior production technology, the invention provides a pre-heat treatment method for refining the grain size of a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging, which can solve the technical problem that the grain size of the pre-heat treatment state of the existing 30Si2MnCrMoVE forging is difficult to reach the requirement of grade 4 or grade 5. The preheating treatment method for refining the grain size of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging is characterized by comprising the following steps of: (1) annealing at the annealing temperature of 750-890 ℃ for 2-3 h, and cooling; (2) normalizing at the normalizing temperature of 910-930 ℃ for 0.8-1 h, and cooling; (3) high-temperature tempering is carried out, wherein the tempering temperature is 700-730 ℃, the heat preservation time is 3-4 h, and cooling is carried out; the difference between the annealing temperature and the normalizing temperature is not lower than 20 ℃.
Description
Technical Field
The invention belongs to the technical field of material science, and particularly relates to a preheating treatment process method of ultrahigh-strength alloy steel, in particular to a preheating treatment method for refining the grain size of a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging.
Background
The continuous propulsion of the aerospace industry has put higher demands on ultra-high-strength steel, and 30Si2MnCrMoVE ultra-high-strength alloy steel is produced in the background and mainly used for solid rocket shells and engine pump cross shafts. In the preparation of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging, referring to the GJB3325-1998 standard requirement, the final heat treatment of quenching (920-940 ℃, 1h, oil quenching) and low-temperature tempering (290-310 ℃, 3h, air cooling) is required, the corresponding tensile strength is above 1620MPa, the mechanical processing of the part under such high strength will inevitably reduce the service life of the tool and the processing efficiency, in order to avoid the above problems, the forging is generally subjected to mechanical processing after the preliminary heat treatment, the final heat treatment of quenching and low-temperature tempering is carried out after the part is processed to be close to the size, and the preliminary heat treatment state is normal heating and high-temperature tempering. However, the forged piece delivered in this preliminary heat treatment state has several problems in actual production:
(1) the preparation heat treatment, namely the system of normalizing and high-temperature tempering, is unreasonable, and the grain size of the forging in the preparation heat treatment state cannot reach the requirement of 4 grade or 5 grade;
(2) the structural performance of the forged piece after final heat treatment depends on the state of the forged piece in the preliminary heat treatment state, the preliminary heat treatment cannot adjust the forged piece in the preliminary heat treatment state to the most stable state only by using a normalizing and high-temperature tempering system, so that the structural performance stability of the forged piece in the final heat treatment state is poor, the performance cannot meet the standard requirement, the preliminary heat treatment and the final performance heat treatment need to be repeated, the production cost is increased, and the production efficiency is reduced.
Metal working: an academic paper entitled influence of isothermal annealing on microstructure and mechanical property of 30Si2MnCrMoVE steel is published in journal 2011, No. 17, and the paper provides a final heat treatment process method for improving the property of a final service state structure; the patent publications CN103276164A and CN104294014A both propose different final heat treatment processes for improving the properties of the final in-use structure. The published data has little to no treatment process method in the state of the preliminary heat treatment, and the research on the aspect is more significant.
Disclosure of Invention
In order to overcome the problems in the prior production technology, the invention provides a pre-heat treatment method for refining the grain size of a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging, which can solve the technical problem that the grain size of the pre-heat treatment state of the existing 30Si2MnCrMoVE forging is difficult to reach the requirement of grade 4 or grade 5.
The technical scheme is that the preheating treatment method for refining the grain size of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging is characterized by comprising the following steps of:
(1) annealing at the annealing temperature of 750-890 ℃ for 2-3 h, and cooling;
(2) normalizing at the normalizing temperature of 910-930 ℃ for 0.8-1 h, and cooling;
(3) high-temperature tempering is carried out, wherein the tempering temperature is 700-730 ℃, the heat preservation time is 3-4 h, and cooling is carried out;
the difference between the annealing temperature and the normalizing temperature is not lower than 20 ℃.
Further, in the step (1), a 30Si2MnCrMoVE ultrahigh strength alloy steel forging is placed in a heating furnace at 870 ℃ and is subjected to temperature preservation for 2.5 hours;
in the step (2), the forging processed in the step (1) is placed in a heating furnace at the temperature of 910 ℃ and is subjected to heat preservation for 1 hour;
and (3) placing the forged piece treated in the step (2) in a heating furnace at 720 ℃ and keeping the temperature for 3.5 hours.
Further, air cooling is adopted in the step (1), and the temperature is cooled to be below 200 ℃;
air cooling is adopted in the step (2), and the temperature is cooled to be below 200 ℃;
and (3) air cooling is adopted, and the temperature is cooled to room temperature.
The invention has the following beneficial effects:
(1) according to the invention, an annealing process at 750-890 ℃ is added before conventional normalizing and high-temperature tempering, and tissue preparation is carried out for the subsequent normalizing process, the addition of the process can convert the tissue into a uniform annealing tissue, so that the heat preservation time of normalizing at a higher temperature is shortened, and the growth of grains is prevented, thus the grains are refined, and meanwhile, the annealing temperature is lower than the normalizing temperature by more than 20 ℃, so that the growth of the grains can be further prevented, and thus the grains are refined;
(2) compared with the common normalizing temperature in other steels, the normalizing temperature is slightly higher than the quenching temperature, the normalizing temperature is not higher than the quenching temperature of the final performance heat treatment of the forge piece, the heat preservation time is 0.8-1 h, and the forge piece is taken out of a furnace for air cooling;
(3) the grain size qualification rate of the forging produced by the process method in the preliminary heat treatment state is obviously improved, and the grain size reaches 5 grades or finer.
Drawings
FIG. 1 is a photograph of the metallographic structure of a forging in a preliminarily heat-treated state according to example 1.
FIG. 2 is a photograph of the metallographic structure of a forging in a preliminarily heat-treated state according to comparative example 1.
Detailed Description
The 30Si2MnCrMoVE ultra-high strength alloy steel forgings of the following example 1 and the comparative example 1 are obtained by cutting a 30Si2MnCrMoVE ultra-high strength alloy steel plate, and the 30Si2MnCrMoVE ultra-high strength alloy steel plate is not forged, is purchased from Fushun Special Steel works Ltd, and the formula of the 30Si2MnCrMoVE is in accordance with the standard requirements of GJB 3326-1998.
Example 1
The preheating treatment method for refining the grain size of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging comprises the following steps of:
(1) annealing, namely, putting a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging into a heating furnace at 870 ℃, keeping the temperature for 2.5 hours, taking out of the furnace, and cooling in air to below 200 ℃, wherein the temperature for keeping the temperature needs to be lower than that of normalizing by more than 20 ℃, specifically 40 ℃;
(2) normalizing, namely putting the forged piece treated in the step (1) into a heating furnace at 910 ℃, keeping the temperature for 1h, discharging from the furnace, and air-cooling to below 200 ℃, wherein the temperature for keeping the temperature is not higher than the quenching temperature of the final performance heat treatment of the forged piece (920-940 ℃, GJB3325-1998 standard requirement);
(3) and (3) high-temperature tempering, namely, putting the forged piece treated in the steps (1) and (2) into a heating furnace at 720 ℃, keeping the temperature for 3.5 hours, taking out the forged piece from the heating furnace, and air-cooling the forged piece to room temperature to obtain the forged piece in a preliminary heat treatment state, wherein a metallographic structure photo of the forged piece is shown in figure 1, and the average grain size is 5-5.5 grade.
Comparative example 1
The conventional pre-heat treatment method for grain size of 30Si2MnCrMoVE ultra-high strength alloy steel is different from that of example 1 in that the annealing process of step (1) is omitted.
The metallographic structure photograph of the forging in the pre-heat-treated state of comparative example 1 is shown in fig. 2, and the average grain size is 3.5 to 4 grades.
As can be seen from the graphs 1 and 2, compared with the conventional preheating treatment method, the preheating method disclosed by the invention can obviously refine the grain size of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging in a preheating treatment state by 1-1.5 grades, so that the grain size reaches 5 grades or above, and the preheating method has a good application prospect for improving the quality consistency of products.
Claims (3)
1. The preheating treatment method for refining the grain size of the 30Si2MnCrMoVE ultrahigh-strength alloy steel forging is characterized by comprising the following steps of:
(1) annealing at the annealing temperature of 750-890 ℃ for 2-3 h, and cooling;
(2) normalizing at the normalizing temperature of 910-930 ℃ for 0.8-1 h, and cooling;
(3) high-temperature tempering is carried out, wherein the tempering temperature is 700-730 ℃, the heat preservation time is 3-4 h, and cooling is carried out;
the difference between the annealing temperature and the normalizing temperature is not lower than 20 ℃.
2. The preliminary heat treatment method for refining the grain size of a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging according to claim 1, characterized by comprising the following steps of: in the step (1), a 30Si2MnCrMoVE ultrahigh strength alloy steel forging is placed in a heating furnace at 870 ℃ and is kept warm for 2.5 hours; in the step (2), the forging processed in the step (1) is placed in a heating furnace at the temperature of 910 ℃ and is subjected to heat preservation for 1 hour; and (3) placing the forged piece treated in the step (2) in a heating furnace at 720 ℃ and keeping the temperature for 3.5 hours.
3. The preliminary heat treatment method for refining the grain size of a 30Si2MnCrMoVE ultrahigh-strength alloy steel forging according to claim 1, characterized by comprising the following steps of: the step (1) adopts air cooling, and the temperature is cooled to be below 200 ℃; air cooling is adopted in the step (2), and the temperature is cooled to be below 200 ℃; and (3) air cooling is adopted, and the temperature is cooled to room temperature.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5385710A (en) * | 1977-01-07 | 1978-07-28 | Hitachi Ltd | Heat treating method for low alloy steel |
| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN105734249A (en) * | 2014-12-10 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Method for refining grain size of large 1Cr11Ni2W2MoV shaft forge pieces |
| CN106048448A (en) * | 2016-02-01 | 2016-10-26 | 刘少尊 | High-modulus low-temperature-tempered Al-containing alloy steel and preparation method |
| CN108998638A (en) * | 2018-09-13 | 2018-12-14 | 天津重型装备工程研究有限公司 | A kind of heat treatment method of 620 DEG C or more supercritical turbine casting |
-
2021
- 2021-12-31 CN CN202111667990.0A patent/CN114350910A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5385710A (en) * | 1977-01-07 | 1978-07-28 | Hitachi Ltd | Heat treating method for low alloy steel |
| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN105734249A (en) * | 2014-12-10 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Method for refining grain size of large 1Cr11Ni2W2MoV shaft forge pieces |
| CN106048448A (en) * | 2016-02-01 | 2016-10-26 | 刘少尊 | High-modulus low-temperature-tempered Al-containing alloy steel and preparation method |
| CN108998638A (en) * | 2018-09-13 | 2018-12-14 | 天津重型装备工程研究有限公司 | A kind of heat treatment method of 620 DEG C or more supercritical turbine casting |
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