CN111172375A - Heat treatment method for improving fan impeller strength - Google Patents
Heat treatment method for improving fan impeller strength Download PDFInfo
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- CN111172375A CN111172375A CN202010051629.4A CN202010051629A CN111172375A CN 111172375 A CN111172375 A CN 111172375A CN 202010051629 A CN202010051629 A CN 202010051629A CN 111172375 A CN111172375 A CN 111172375A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 67
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 239000006104 solid solution Substances 0.000 claims abstract description 21
- 238000010791 quenching Methods 0.000 claims abstract description 20
- 230000000171 quenching effect Effects 0.000 claims abstract description 20
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 11
- 238000004321 preservation Methods 0.000 claims description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 229910000734 martensite Inorganic materials 0.000 abstract description 3
- 238000010923 batch production Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 40
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000010721 machine oil Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for improving the strength of a fan impeller, which is implemented according to the following steps: step 1, carrying out solid solution treatment on a fan impeller of alloy steel in a heat treatment furnace; step 2, performing oil quenching treatment in an oil drum; and 3, tempering, and cooling to room temperature to obtain the heat-treated alloy steel fan impeller. The invention has the beneficial effects that: the material treated by the heat treatment process can obtain a lath martensite + tempered sorbite structure, and the structure distribution is uniform and fine; the yield strength of the fan impeller treated by the heat treatment process is greatly improved compared with that before heat treatment; the heat treatment process method is simple, convenient to operate, suitable for large-scale factory batch production and high in production efficiency.
Description
Technical Field
The invention belongs to the technical field of heat treatment of metal materials, and particularly relates to a heat treatment method for improving the strength of a fan impeller.
Background
The core component of the large centrifugal fan is a fan impeller, the quality of the fan impeller is directly related to the service life of the whole fan, and how to improve the service life of the impeller is a key point of attention of manufacturers and a focus of attention of users.
The application field of the centrifugal fan is enlarged, particularly the application in a complex stress environment, and the improvement of the integral mechanical property of the large centrifugal fan is important. In the process of high-speed rotation of the fan, the fan impeller bears high centrifugal force and alternating loads such as hard object impact, airflow, vibration and the like, and the impeller blade is subjected to fatigue failure at a stress level far lower than the yield strength of a material, so that great potential danger is caused. Therefore, it is necessary to further optimize the heat treatment process of the fan impeller so as to improve the yield strength of the fan impeller.
Disclosure of Invention
The invention aims to provide a heat treatment method for improving the strength of a fan impeller, which solves the problem of low yield strength of the fan impeller in the prior art.
The technical scheme adopted by the invention is that the heat treatment method for improving the strength of the fan impeller is implemented according to the following steps:
step 1, carrying out solid solution treatment on a fan impeller of alloy steel in a heat treatment furnace to obtain a solid solution alloy steel fan impeller;
step 2, taking the solid solution alloy steel fan impeller out of the heat treatment furnace, and performing oil quenching treatment in an oil drum to obtain an oil quenching alloy steel fan impeller;
and 3, tempering the oil-quenched alloy steel fan impeller, and then cooling to room temperature to obtain the heat-treated alloy steel fan impeller.
The invention is also characterized in that:
in the step 1, the alloy steel material is one of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520.
In the step 1, the solution treatment temperature is 880-920 ℃, and the heat preservation time is 1-3 h.
The oil quenched in the step 2 is one of L-AN15 oil, L-AN22 oil and L-AN46 oil.
In the step 3, the tempering temperature is 500-580 ℃, and the time is 2-3 h.
The cooling mode in the step 3 is an air cooling mode.
The invention has the beneficial effects that: the material treated by the heat treatment process can obtain a lath martensite + tempered sorbite structure, and the structure distribution is uniform and fine; the yield strength of the fan impeller treated by the heat treatment process is greatly improved compared with that before heat treatment; the heat treatment process method is simple, convenient to operate, suitable for large-scale factory batch production and high in production efficiency.
Drawings
FIG. 1 is a metallographic structure diagram of 25Cr2Ni4MoV in example 1 of a heat treatment method for improving fan impeller strength according to the present invention;
FIG. 2 is a metallographic structure diagram of 25Cr2Ni3Mo in example 1 of a heat treatment method for improving fan impeller strength according to the present invention;
FIG. 3 is a metallographic structure diagram of G520 in example 1 of the heat treatment method for improving the strength of the fan impeller according to the invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a heat treatment method for improving the strength of a fan impeller, which is implemented according to the following steps:
step 1, heating a fan impeller of alloy steel to 880-920 ℃ in a heat treatment furnace for solution treatment, wherein the heat preservation time is 1-3 hours, and obtaining the fan impeller of the solution alloy steel;
wherein the alloy steel material is one of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520.
Step 2, taking the solid solution alloy steel fan impeller out of the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature in an oil cooling mode to obtain the oil quenching alloy steel fan impeller;
wherein the oil quenched is one of L-AN15 oil (No. 10 machine oil), L-AN22 oil (No. 20 machine oil), and L-AN46 oil (No. 40 machine oil).
And 3, heating the oil-quenched alloy steel fan impeller to 500-580 ℃ for tempering treatment, keeping the temperature for 2-3 hours, and cooling to room temperature in an air cooling mode to obtain the heat-treated alloy steel fan impeller.
The heat treatment method for improving the strength of the fan impeller comprises the following steps:
the solution treatment can dissolve the excess phase to form a supersaturated solid solution, thereby improving the plasticity and toughness of the steel, obtaining a stable matrix structure, and preparing for subsequent hot working so as to expect to achieve the best effect.
The oil quenching treatment and the tempering treatment can improve the problem of strength reduction of the material after the aging treatment, obtain uniform tempered structure with excellent comprehensive performance, meet the requirements of high-strength steel for fan impellers and simultaneously improve the corrosion resistance and mechanical property of the martensitic stainless steel.
Example 1
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 880 ℃ for solution treatment, and keeping the temperature for 3 hours to obtain a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel in a solid solution manner;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 500 ℃ for tempering treatment, keeping the temperature for 3h, and cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The metallographic structure diagrams of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller obtained in example 1 are respectively shown in FIG. 1, FIG. 2 and FIG. 3, and the specific performance parameters are shown in Table 1.
Example 2
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 890 ℃ for solution treatment, and keeping the temperature for 2 hours to obtain a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel in a solid solution manner;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 520 ℃ for tempering treatment, keeping the temperature for 2.5h, and cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The metallographic structure diagram of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller obtained in example 2 is shown in FIG. 1, and the specific performance parameters are shown in Table 1.
Example 3
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 900 ℃ for solution treatment, and keeping the temperature for 1h to obtain a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel in a solid solution manner;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 540 ℃ for tempering treatment, keeping the temperature for 3h, and cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The specific performance parameters of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller obtained in example 3 are shown in Table 1.
Example 4
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 910 ℃ for solution treatment, and keeping the temperature for 2.5 hours to obtain a solid-solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 560 ℃ for tempering treatment, keeping the temperature for 2.0h, and cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The specific performance parameters of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller obtained in example 4 are shown in Table 1.
Example 5
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 920 ℃ for solution treatment, and keeping the temperature for 1.5h to obtain a solid-solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 570 ℃ for tempering treatment, keeping the temperature for 2.5h, and cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The specific performance parameters of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller obtained in example 5 are shown in Table 1.
Example 6
Step 1, heating a fan impeller made of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel to 920 ℃ for solution treatment, and keeping the temperature for 2.5 hours to obtain a solid-solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller;
step 2, taking out the alloy steel fan impeller of solid solution 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 from the heat treatment furnace, performing oil quenching treatment in an oil drum, and cooling the steel plate to room temperature by adopting an oil cooling mode to obtain the alloy steel fan impeller of oil quenching 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520;
and 3, heating the oil-quenched 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller to 580 ℃ for tempering treatment, keeping the temperature for 2h, and then cooling to room temperature in an air cooling mode to obtain the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller.
The specific performance parameters of the heat-treated 25Cr2Ni4MoV alloy steel fan impeller obtained in example 6 are shown in Table 1.
As is clear from fig. 1, 2 and 3, the structure distribution of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan wheel was uniform and fine, and the lath martensite + tempered sorbite structure was obtained.
TABLE 1 comparison of mechanical properties under different heat treatment processes
As can be seen from the performance parameters in Table 1, the yield strength of the heat-treated 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520 alloy steel fan impeller reaches more than 1100MPa, and the mechanical properties of the heat-treated material are greatly improved, so that the fan impeller has excellent comprehensive mechanical properties.
Claims (6)
1. A heat treatment method for improving the strength of a fan impeller is characterized by comprising the following steps:
step 1, carrying out solid solution treatment on a fan impeller made of alloy steel in a heat treatment furnace to obtain a solid solution alloy steel fan impeller;
step 2, taking the solid solution alloy steel fan impeller out of the heat treatment furnace, and performing oil quenching treatment in an oil drum to obtain an oil quenching alloy steel fan impeller;
and 3, tempering the oil-quenched alloy steel fan impeller, and then cooling to room temperature to obtain the heat-treated alloy steel fan impeller.
2. The heat treatment method for improving the strength of the fan impeller according to claim 1, wherein the alloy steel material in the step 1 is one of 25Cr2Ni4MoV, 25Cr2Ni3Mo and G520.
3. The heat treatment method for improving the strength of the fan impeller according to claim 1, wherein the solution treatment temperature in the step 1 is 880-920 ℃, and the heat preservation time is 1-3 hours.
4. The heat treatment method for improving the strength of the fan impeller according to claim 1, wherein the oil quenched in the step 2 is one of L-AN15 oil, L-AN22 oil and L-AN46 oil.
5. The heat treatment method for improving the strength of the fan impeller according to claim 1, wherein the tempering temperature in the step 3 is 500-580 ℃ for 2-3 hours.
6. The heat treatment method for improving the strength of the fan impeller according to claim 1, wherein the cooling mode in the step 3 is an air cooling mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112553419A (en) * | 2020-10-27 | 2021-03-26 | 沈阳透平机械股份有限公司 | Critical heat treatment method for martensite alloy steel welded impeller |
| CN113151660A (en) * | 2021-03-22 | 2021-07-23 | 西安理工大学 | Two-stage aging process for improving strength of welding part of impeller of air blower |
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| KR101984062B1 (en) * | 2018-12-06 | 2019-06-04 | (주)대코 | A Method of Manufacturing the Blade for the Impeller of a Shot Peeing Machine and a Impeller Blade |
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2020
- 2020-01-17 CN CN202010051629.4A patent/CN111172375A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112553419A (en) * | 2020-10-27 | 2021-03-26 | 沈阳透平机械股份有限公司 | Critical heat treatment method for martensite alloy steel welded impeller |
| CN113151660A (en) * | 2021-03-22 | 2021-07-23 | 西安理工大学 | Two-stage aging process for improving strength of welding part of impeller of air blower |
| CN113151660B (en) * | 2021-03-22 | 2023-02-03 | 西安理工大学 | Two-stage aging process for improving strength of welding part of impeller of air blower |
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Application publication date: 20200519 |