CN114317923A - Hot working process for improving short transverse impact performance of X5CrNiCuNb16-4 turbine blade - Google Patents
Hot working process for improving short transverse impact performance of X5CrNiCuNb16-4 turbine blade Download PDFInfo
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Abstract
The invention provides a hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade, which can solve the technical problem that the short transverse impact performance of a forged piece processed by the conventional heat treatment process is poor. A hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade is characterized by comprising the following steps of: cooling after forging, performing preliminary heat treatment and performing conventional heat treatment; cooling after forging by water cooling with average cooling speed of 100-; the preliminary heat treatment comprises high-temperature solid solution, the temperature of the high-temperature solid solution is T1, and the heat preservation time is 1.5-5 hours; the conventional heat treatment comprises conventional solid solution, the conventional solid solution temperature is T2, the heat preservation time is 4h, the T2 is 1010-1050 ℃, and the T1-T2 are 20-150 ℃.
Description
Technical Field
The invention relates to a hot working process of a turbine blade, in particular to a hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade.
Background
The X5CrNiCuNb16-4 stainless steel has high strength, good toughness and excellent corrosion resistance, so the X5CrNiCuNb16-4 stainless steel has wide application in the field of turbine blade heavy forgings. However, in the process of process certification of the large turbine blade forging, the short transverse impact performance of the forging is poor, and the technical requirements of customers cannot be met.
Disclosure of Invention
The invention provides a hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade, which can solve the technical problem that the short transverse impact performance of a forged piece processed by the conventional heat treatment process is poor.
The technical scheme is that the hot working process for improving the short transverse impact performance of the X5CrNiCuNb16-4 turbine blade is characterized by comprising the following steps of: cooling after forging, performing preliminary heat treatment and performing conventional heat treatment;
cooling after forging by water cooling with average cooling speed of 100-;
the preliminary heat treatment comprises high-temperature solid solution, the temperature of the high-temperature solid solution is T1, and the heat preservation time is 1.5-5 hours;
the conventional heat treatment comprises conventional solid solution, the conventional solid solution temperature is T2, the heat preservation time is 4h, the T2 is 1010-1050 ℃, and the T1-T2 are 20-150 ℃.
Further, the high-temperature solid solution temperature is 1060 ℃, the heat preservation time is 5 hours, the conventional solid solution temperature is 1035 ℃, the heat preservation time is 2 hours, the intermediate adjustment temperature is 835 ℃, the heat preservation time is 2 hours, the aging temperature is 550 ℃, and the heat preservation time is 4 hours.
The hot working process of the invention adopts the rapid cooling technology after the forging and the preliminary heat treatment of high-temperature solid solution before the conventional heat treatment, thereby effectively improving the short transverse impact property of the precipitation hardening stainless steel turbine blade. The rapid cooling and high-temperature solution treatment increasing stage are adopted after forging, the problem that coarse alloy carbides cannot be subjected to sufficient solution treatment in the forging and cooling process is solved, grain refinement is facilitated, impact toughness is improved, short transverse impact performance is influenced most obviously, and the short transverse impact performance of the precipitation hardening stainless steel turbine blade, especially the martensite precipitation hardening stainless steel turbine blade, is improved obviously.
Drawings
FIG. 1 is a metallographic structure photograph of a bar material according to example 1 of the present invention.
FIG. 2 is a metallographic structure photograph of a forging according to example 1 of the present invention, wherein the water cooling rate is 120 ℃/s.
FIG. 3 is a photograph of the metallographic structure of the forging according to example 1 of the present invention, corresponding to a water cooling rate of 60 ℃/s. .
Detailed Description
The X5CrNiCuNb16-4 bar (phi 180 mm) is purchased from Baomart Steel Co., Ltd, and is subjected to free forging and die forging treatment in sequence before the cooling step after the cutting, wherein the free forging conditions are the forging heating temperature of 1140 and 1500 ℃ and the forging thickness is 140mm, the die forging conditions are the forging heating temperature of 1140 and 1500 ℃ and the forging thickness is 80mm, and the turbine blade of example 1 and the turbine blade of comparative example 1 are simulated by a thin plate forging with the thickness of 80 mm.
Example 1
A hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade comprises the following steps in sequence:
(1) cooling after forging, and cooling the blade by water after forging at the cooling speed of 120 ℃/s;
(2) performing preliminary heat treatment, specifically, performing high-temperature solid solution at 1160 ℃ (as shown in fig. 1, the segregation of the bar raw material is serious, and the coarsening of the second phase after forging is serious, so that the higher preliminary heat treatment is adopted for structure homogenization treatment to prepare for subsequent solid solution), keeping the temperature for 1.5 hours, and then cooling to room temperature in air;
(3) and conventional heat treatment, which comprises solid solution treatment, intermediate adjustment treatment and aging treatment which are sequentially carried out, wherein the conventional solid solution temperature is 1035 ℃, the heat preservation time is 2 hours, the intermediate adjustment temperature is 835 ℃, the heat preservation time is 2 hours, the aging temperature is 550 ℃, and the heat preservation time is 4 hours.
On the basis of the embodiment 1, the water cooling speed of 60 ℃/s is used as a reference, metallographic structure photographs of the forged piece after conventional heat treatment are respectively shown in fig. 2 and fig. 3, and the comparison of the two figures shows that white carbide particles are finer by increasing the cooling speed, so that the grains are favorably refined, and the impact toughness is improved.
Comparative example 1
The precipitation hardened stainless steel turbine blade used in this example was the same as in example 1, except that: after the blade is forged, air cooling is adopted, high-temperature solution treatment is not carried out, and only conventional heat treatment is carried out, wherein the conventional solution treatment, the intermediate adjustment treatment and the aging treatment are sequentially carried out, wherein the conventional solution treatment temperature is 1035 ℃ x2h, the intermediate adjustment temperature is 835 ℃ x2h, and the aging temperature is 550 ℃ x5 h.
The specific test results are shown in the following table:
in the table, Rm is tensile strength, rp0.2 is conditional yield, a is elongation after fracture, Z is shrinkage of end face, and kv1-v3 is impact absorption energy.
As can be seen from the above analysis of the tabulated data, the short transverse impact performance of the precipitation hardened stainless steel turbine blade can be effectively improved by the rapid cooling technique after the end of forging and the preliminary heat treatment of adding high temperature solid solution before the conventional heat treatment.
Claims (2)
1. A hot working process for improving the short transverse impact performance of an X5CrNiCuNb16-4 turbine blade is characterized by comprising the following steps of: cooling after forging, performing preliminary heat treatment and performing conventional heat treatment;
cooling after forging by water cooling with average cooling speed of 100-;
the preliminary heat treatment comprises high-temperature solid solution, the temperature of the high-temperature solid solution is T1, and the heat preservation time is 1.5-5 hours;
the conventional heat treatment comprises conventional solid solution, the conventional solid solution temperature is T2, the heat preservation time is 4h, the T2 is 1010-1050 ℃, and the T1-T2 are 20-150 ℃.
2. The hot working process for improving the short transverse impact performance of the X5CrNiCuNb16-4 turbine blade according to claim 1, wherein the hot working process comprises the following steps: the high-temperature solid solution temperature is 1060 ℃, the heat preservation time is 5h, the conventional solid solution temperature is 1035 ℃, the heat preservation time is 2h, the intermediate adjustment temperature is 835 ℃, the heat preservation time is 2h, the aging temperature is 550 ℃, and the heat preservation time is 4 h.
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| CN202111667936.6A CN114317923A (en) | 2021-12-31 | 2021-12-31 | Hot working process for improving short transverse impact performance of X5CrNiCuNb16-4 turbine blade |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61238941A (en) * | 1985-04-15 | 1986-10-24 | Kobe Steel Ltd | Untempered steel for hot forging |
| CN103667617A (en) * | 2013-12-13 | 2014-03-26 | 无锡透平叶片有限公司 | Heat treatment process for improving impact toughness of 1Cr12Ni3Mo2VN turbine blade |
| CN108611569A (en) * | 2018-08-01 | 2018-10-02 | 浙江大隆合金钢有限公司 | 520B precipitation-hardening stainless steels steel ingot and its production method |
| CN108823384A (en) * | 2018-07-10 | 2018-11-16 | 无锡派克新材料科技股份有限公司 | A kind of large-size stainless steel ring high temperature forging deformation method for grain refinement |
| CN111270058A (en) * | 2020-01-22 | 2020-06-12 | 大冶特殊钢有限公司 | Heat treatment method for martensite precipitation hardening type stainless steel module after forging |
| CN112893510A (en) * | 2021-03-05 | 2021-06-04 | 无锡继平锻造有限公司 | Forging and heat treatment process of marine corrosion-resistant pull rod duplex stainless steel forging |
-
2021
- 2021-12-31 CN CN202111667936.6A patent/CN114317923A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61238941A (en) * | 1985-04-15 | 1986-10-24 | Kobe Steel Ltd | Untempered steel for hot forging |
| CN103667617A (en) * | 2013-12-13 | 2014-03-26 | 无锡透平叶片有限公司 | Heat treatment process for improving impact toughness of 1Cr12Ni3Mo2VN turbine blade |
| CN108823384A (en) * | 2018-07-10 | 2018-11-16 | 无锡派克新材料科技股份有限公司 | A kind of large-size stainless steel ring high temperature forging deformation method for grain refinement |
| CN108611569A (en) * | 2018-08-01 | 2018-10-02 | 浙江大隆合金钢有限公司 | 520B precipitation-hardening stainless steels steel ingot and its production method |
| CN111270058A (en) * | 2020-01-22 | 2020-06-12 | 大冶特殊钢有限公司 | Heat treatment method for martensite precipitation hardening type stainless steel module after forging |
| CN112893510A (en) * | 2021-03-05 | 2021-06-04 | 无锡继平锻造有限公司 | Forging and heat treatment process of marine corrosion-resistant pull rod duplex stainless steel forging |
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