Accession Number : ADA265451


Title :   Fatigue in Single Crystal Nickel Superalloys


Descriptive Note : Technical progress rept. 16 Apr-15 May 93,


Corporate Author : PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT ENGINES AND SPACE PROPULSION


Personal Author(s) : DeLuca, Daniel P ; Annis, Charles


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265451.pdf


Report Date : 15 May 1993


Pagination or Media Count : 6


Abstract : This program investigates the seemingly unusual behavior of single crystal airfoil materials. The fatigue initiation processes in single crystal (SC) materials are significantly more complicated and involved than fatigue initiation and subsequent behavior of a (single) macrocrack in conventional, isotropic, materials. To understand these differences it is helpful to review the evolution of high temperature airfoils. Modern gas turbine flight propulsion systems employ single crystal materials for turbine airfoil applications because of thier superior performance in resisting creep, oxidation, and thermal mechanical fatigue (TMF). These properties have been achieved by composition and alloying, of course, but also by appropriate crystal orientation and associated anisotropy.


Descriptors :   *SUPERALLOYS , PERFORMANCE(ENGINEERING) , CRACKS , SINGLE CRYSTALS , AIRFOILS , CRACK PROPAGATION , TURBINE COMPONENTS , OXIDATION , CREEP , FATIGUE(MECHANICS) , THERMAL FATIGUE , NICKEL ALLOYS


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE