A heat treatment method for K465 alloy turbine blade to restore performance
A heat treatment method and turbine blade technology, applied in the field of metallurgy, can solve the problems such as no precedent for the performance recovery of K465 alloy turbine blades, and achieve the effect of strong operability and easy operation
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Embodiment 1
[0029] A K465 alloy turbine blade recovery performance heat treatment method is carried out according to the following steps:
[0030] (1) Blade loading: Put the K465 alloy turbine blades that have served for one life into the vacuum furnace perpendicular to the surface of the fixture; figure 1 or figure 2 shown;
[0031] (2) Heat preservation after heating up with the furnace: under the protection of inert gas, the vacuum furnace is powered from room temperature, heated and heated up with the furnace, kept at 950 ° C ~ 960 ° C for 40 minutes, kept at 1190 ° C ~ 1200 ° C for 2.5 hours, and heated from room temperature To 1230°C, the entire heating time should be controlled within 6.0h; keep warm at 1230°C for 4h;
[0032] (3) Cool down with the furnace: under the condition of cooling rate of 40±25°C / min, cool from 1230°C to 1000°C, and cool with inert gas partial pressure; at 1000°C, fill inert gas and cool to 300°C, the cooling rate is equivalent For air cooling, the air ...
Embodiment 2
[0040] Example 2 is basically the same as Example 1, the difference is: (2) heat preservation after heating up with the furnace: under vacuum, the vacuum furnace is powered from room temperature, heated and heated up with the furnace, and kept at 950 ° C ~ 960 ° C for 45 minutes. Keep warm at 1190°C~1200°C for 2 hours, heat from room temperature to 1230°C, the whole heating time should be controlled within 5.5h; keep warm at 1230°C for 4.5h,
[0041] After K465 alloy undergoes recovery heat treatment at 1230℃ for 4.5h, its microstructure is Figure 4 (b) transforms into Figure 4 (e), its mechanical properties are shown in Table 3; the morphology of intragranular γ′ is restored from polygonal or flower basket to cubic, and its morphology is more square than that before heat treatment. It can be seen from Table 3 that its mechanical properties meet the requirements of technical conditions.
[0042] Table 3 Mechanical properties after heat treatment
[0043]
[0044] After...
Embodiment 3
[0046] Example 3 is basically the same as Example 1, the difference is: (2) heat preservation after heating up with the furnace: under vacuum, the vacuum furnace is powered from room temperature, heated and heated up with the furnace, and kept at 950 ° C ~ 960 ° C for 43 minutes. Insulate at 1190°C~1200°C for 2.2 hours, heat from room temperature to 1230°C, the entire heating time should be controlled within 5.7 hours; keep at 1230°C for (4~4.5) hours.
[0047] After testing, after heat treatment for recovery performance, the morphology of intragranular γ′ recovers from polygonal or flower basket shape to cubic shape, which is more square than before heat treatment for recovery performance. Its mechanical properties meet the requirements of technical conditions.
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