Microstructure and High-temperature Mechanical Properties of Different Positions of Turbine Disc Forgings in GH4706 Superalloy
In order to study the differences in microstructure and high temperature properties of different positions of turbine disc forging in GH4706 alloy, comparative analysis of mechanical properties at high temperature were carried out. Detailed experiments included high-temperature tensile property (con...
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Veröffentlicht in: | Te shu gang 2024-08, Vol.45 (5), p.102-107 |
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Sprache: | chi |
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Zusammenfassung: | In order to study the differences in microstructure and high temperature properties of different positions of turbine disc forging in GH4706 alloy, comparative analysis of mechanical properties at high temperature were carried out. Detailed experiments included high-temperature tensile property (conducted at the temperature of 400 ℃, 500 ℃, 600 ℃ and 650 ℃), high-temperature low-cycle fatigue (conducted at the temperature of 400 ℃, 500 ℃ and 600 ℃) and high-temperature stress rupture life (conducted at the condition of 650 ℃/690 MPa and 600 ℃/700 MPa) based on typical service performance requirements. The test results showed that the grain sizes of the hub, spoke and rim varied significantly, with the hub grain size level 4 (average grain size 84 μm), spoke grain size level 3 (average grain size 120 μm) and rim grain size level 2 (average grain size 183 μm).The γ′-γ″ composite of the samples in different positions were dispersed in spherical shape. The η phase of hub and plate is in needle shape, with larger |
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ISSN: | 1003-8620 |
DOI: | 10.20057/j.1003-8620.2024-00004 |