Effect of aging at 650 °C on microstructure and mechanical properties of GH783 alloy bolt

Duan, Ping; Liu, Zongde; Li, Bin; Wang, Qi; Gu, Shuchao

doi:10.1016/j.engfailanal.2020.104853

Cited by 4 publications

(2 citation statements)

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“…The examination of diffraction peaks by means of XRD proved the formation of an Ni 5 A1 3 phase after aging for 1000 h at 650 • C [22], as shown in Figure 8. The XRD result in 650 • C is quoted from our previous research [23]. It could be seen that the as-initial Inconel 783 bolt consisted of β-NiA1 with a bcc structure associated with about 44.0 • and γ' with an fcc structure associated with about 74.7 • and 90.7 • , respectively.…”

Section: Morphology and Microstructurementioning

confidence: 90%

“…Figure 9 shows the results of tensile property assessment at room temperature for specimens subjected to different aging treatments [23]. After the aging treatment at 650 • C and 700 • C, Inconel 783 alloy bolts showed a decrease in yield strength and tensile strength with different aging times, compared to the as-initial bolts.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Evolution in Microstructure and Mechanical Properties of Inconel 783 Alloy Bolts after Long Term High-Temperature Aging at 700 °C

Duan

Liu

Gu³

et al. 2020

Metals

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This paper described systematically the changes in microstructure and mechanical properties of Inconel 783 alloy after a considerably long time (equivalently 55,000 h, about 76.4 months) of thermal exposure. Based on the Inconel 783 alloy bolts of an intermediate pressure main stop valve used in a 1000 MW ultra-supercritical unit, the evolution of microstructures and mechanical properties were studied after 700 °C aging temperature with different aging times (1000 h, 3000 h and 20,000 h, corresponding to about 1.4 months, 4.2 months and 27.8 months, respectively), using an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD), a universal tensile testing machine and impact testing machine. The results indicated that the bolts aged for 1000 h in two temperatures, showing the second needle β phase, of which the quantity and size obviously increased with aging time. Meanwhile, the characteristics in quantity and shape of the primary β phase changed obviously with the aging time, which transformed to strip the Ni5Al3 and Laves-Nb-rich brittle phase in the matrix after aging for 20,000 h. The size of the γ’ phase grew bigger with aging time, and orientation distributions have been observed obviously at 3000 h aging in 700 °C. Compared with the 650 °C aging temperature, the coarsening of γ’ precipitates and second needle β, the orientation distributions of γ’ were more obvious at the 700 °C aging temperature with aging time, which resulted in the rapid decline in yield strength and tensile strength and obvious increase in the brittleness for Inconel 783 alloy bolts.

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Section: Morphology and Microstructurementioning

confidence: 90%

Section: Mechanical Propertiesmentioning

confidence: 99%