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http://dx.doi.org/10.3795/KSME-A.2017.41.8.765

Life Prediction of Low Cycle Fatigue for Ni-base Superalloy GTD111 DS at Elevated Temperature  

Kim, Jin Yeol (School of Mechanical Engineering, Chungnam Nat'l Univ.)
Yoon, Dong Hyun (School of Mechanical Engineering, Chungnam Nat'l Univ.)
Kim, Jae Hoon (School of Mechanical Engineering, Chungnam Nat'l Univ.)
Bae, Si Yeon (KEPCO Research Institute)
Chang, Sung Yong (KEPCO Research Institute)
Chang, Sung Ho (KEPCO Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.8, 2017 , pp. 765-770 More about this Journal
Abstract
GTD111 DS of nickel base superalloy has been used for gas turbine blades. In this study, low cycle fatigue test was conducted on the GTD111 DS alloy by setting conditions similar to the real operating environment. The low cycle fatigue tests were conducted at room temperature, $760^{\circ}C$, $870^{\circ}C$, and various strain amplitudes. Test results showed that fatigue life decreased with increasing total strain amplitude. Cyclic hardening response was observed at room temperature and $760^{\circ}C$; however, tests conducted at $870^{\circ}C$ showed cyclic softening response. Stress relaxation was observed at $870^{\circ}C$ because creep effects occurred from holding time. A relationship between fatigue life and total strain range was obtained from the Coffin-Manson method. The fratography using a SEM was carried out at the crack initiation and propagation regions.
Keywords
Coffin-Manson Equation; Directional Solidification; Fatigue Life; Low Cycle Fatigue; Superalloy;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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