Effect of microstructural characteristics on the low cycle fatigue behaviors of cast Ni-base superalloys
作者： I.S. Kim , B.G. Choi , J.E. Jung , J. Do , C.Y. Jo
DOI: 10.1016/J.MATCHAR.2015.06.011
关键词: Fatigue limit 、 Metallurgy 、 Stress concentration 、 Superalloy 、 Microstructure 、 Dislocation 、 Materials science 、 Alloy 、 Cyclic stress 、 Deformation (engineering)
摘要: Abstract Low cycle fatigue behaviors of two cast Ni-base superalloys have been investigated. Effects microstructure a solution hardened alloy and precipitation strengthened on cyclic stress responses were studied at various temperatures strain ranges. In the case alloy, Hastelloy X, lives lower are longer than those higher regardless total range. IN738LC which is by γ′ particles founded to life low temperature high when range low. However, has high. Because cut coupled dislocation slip band forms, deformation inhomogeneous, concentrated local region during test, while thermally assisted movements result in less concentration temperature. Therefore, that under condition. When low, oxidation plays important role behavior. Oxidation decreases means affecting crack initiation growth behavior
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