Accession Number : ADA133598

Title :   Elevated Temperature Low Cycle Fatigue of Nickel Base Superalloys in the Conventionally Cast, Directionally Solidified and Single Crystal Forms.

Descriptive Note : Final rept. 1 Jan 80-30 Jun 83,

Corporate Author : CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING

Personal Author(s) : Antolovich,Stephen D

PDF Url : ADA133598

Report Date : Aug 1983

Pagination or Media Count : 61

Abstract : High temperature low cycle fatigue (LCF) has been studied for directionally solidified (DS) and conventionally cast (CC) Rene' 80. For the conventionally cast material testing was carried out on smooth bars over the temperature range 75 F (24 C) to 1800 F (982 C). It was found that at low temperatures slip was planar and carbides acted as crack initiation sites. In correspondence with the importance of carbides on the fatigue life it was found that life cosrrelated best with total strain range (as opposed to plastic strain range).

Descriptors :   *Superalloys, *Nickel alloy inconel, *Fatigue(Mechanics), *Cyclic tests, High temperature, Microstructure, Single crystals, Solidification, Modulus of elasticity, Strain(Mechanics), Degradation, Casting, Carbides, Morphology, Fatigue life, Electron microscopy, Interactions, Dislocations, Crack propagation, Strength(Mechanics), Plastic properties, Ductility, Brittleness, Trade off analysis

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE