Fatigue-crack-propagation thresholds in a nickel-base superalloy at high frequencies and temperatures

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 33; no. 7; pp. 1949 - 1962
• Main Authors: SHYAM, A, PADULA, S. A, MARRAS, S. I, MILLIGAN, W. W
• Format: Journal Article
• Language: English
• Published: New York, NY Springer 01.07.2002; Springer Nature B.V
• Subjects: Alloys; Applied sciences; Complexity; Condensed matter: structure, mechanical and thermal properties; Crack propagation; Exact sciences and technology; Fatigue failure; Fatigue tests; Fatigue, brittleness, fracture, and cracks; Fracture mechanics; Fracture surfaces; Frequency variation; Grain size; Heat treating; Heat treatment; High frequencies; Intergranular fracture; Load; Low temperature; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metallurgy; Metals. Metallurgy; Microstructure; Nickel; Nickel base alloys; Physics; Powder metallurgy; Propagation; Room temperature; Superalloys; Surface roughness; Thresholds; Nickel base alloys; Fracture mechanics; Cracking; Sintered alloy; High temperature; Experimental study; Superalloys; Heat treatments; Crack propagation; Cracks; Temperature effects; High frequency; Microstructure; Fractography; Fatigue cracks
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-002-0028-2

Fatigue-crack-propagation (FCP) tests were conducted on the powder metallurgy nickel-based super-alloy KM4 at temperatures of 20 degrees Celsius, 550 degrees Celsius and 650 degrees Celsius. The roughness of the fracture surface was found to increase as the load ratio was increased for both microstructures.