On the effect of orientation on creep-fatigue behavior of a single crystal nickel-base superalloy

• Published in: Scripta metallurgica 1984-07, Vol.18 (7), p.731-734
• Main Authors: Richards-Frandsen, Rebecca, Tien, John K.
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fatigue; Fatigue, brittleness, fracture, and cracks; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Mechanical properties of solids; Metals, semimetals and alloys; Metals. Metallurgy; Physics; Specific materials
• ISSN: 0036-9748
• DOI: 10.1016/0036-9748(84)90329-6

Preliminary results of an experimental investigation of the effect of crystal orientation on the creep-fatigue strength of the monocrystalline Ni-based superalloy NASAIR 100 are reported. Specimens with gage length 36 mm and gage diameter 4.76 mm are subjected to sinusoidal testing at 758 + or - 207 MPa, 1 Hz, and 760 + or - 3 C; specimen orientation is determined by Laue back reflection; fracture surfaces are examined by SEM; and failure strain is determined optically. The results are presented in tables and contrasted with those for MAR M200 (Kear and Piearcey, 1967; Leverant and Kear, 1970). Failure times 57.1, 90.1, and 128.8 h and failure strains 0.5, 2.5, and 2.3 percent are found for the orientations (0 0 1), toward (0 -1 1), and toward (1 -1 1), respectively.