Predictions of Fatigue Life of Copper Alloy for Regenerative Cooling Channel of Thrust Chamber

Lee, Keum-Oh; Ryu, Chulsung; 허성찬,; Seok, Choi Hwan

doi:10.6108/kspe.2017.21.6.073

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2019

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“…The fatigue life for the total strain increased with increasing temperature. From the viewpoint of micro-metallurgy, the fatigue life of the superalloy can be longer at 870 ℃ because precipitation hardening due to γ and carbide occurs more actively at 870 ℃ than at 760 ℃ [5]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Low Cycle Fatigue Life Evaluation According to Temperature and Orientation in Nickel-Base Superalloy

Heo

Yoon

Kim

2019

KEM

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Components of gas turbines must be extremely resistant to high temperatures, high stresses, high-temperature corrosion, and erosive environments. The materials used in these environmental conditions are mainly nickel-based superalloys. In this study, the low-cycle fatigue of the nickel-based superalloy Inconel 792 was examined. The total strain range of a gas turbine between 760 °C and 870 °C was considered as the parameter representing the actual gas turbine operation. In addition, tests were performed using a trapezoidal waveform of the total strain to reflect the operation-stop conditions of a gas turbine with frequent shutdowns. The results of the fatigue test were compared with the Coffin–Manson method and energy method. The fractured surface was analyzed using a scanning electron microscope (SEM).

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Section: Resultsmentioning

confidence: 99%