Creep-Fatigue Interactions in Advanced Eutectic Superalloys.

Abstract

This project has been concerned with three facets of cyclic deformation of advanced eutectic composites: (a) high cycle, stress controlled fatigue; (b) stress controlled crack growth; (c) low cycle, strain controlled fatigue. Three alloys were selected for study: Nitac 14B, Cotac 744 and AG-170. Experiments have been carried out as a function of several variables: temperature, microstructure, and frequency, in order to obtain as complete a picture as possible of the relative advantages and disadvantages of the three alloys under cyclic loading conditions. In addition, the response of these alloys to cyclic deformation has been compared to that of conventional nickel base alloys. Early in the program it was noted that Cotac 744 was inferior in HCF and LCF properties to the other two alloys. Consequently, during the final year of the program LCF and da/dN tests were carried out on AG-170 and Nitac 14B only.

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Document Details

Document Type
Technical Report
Publication Date
Apr 20, 1984
Accession Number
ADA142872

Entities

People

  • K. N. Jones
  • N. Bylina
  • N. S. Stoloff

Organizations

  • Rensselaer Polytechnic Institute

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Chemical Compounds
  • Composite Materials
  • Contracts
  • Diameters
  • Engineering
  • Eutectic Composites
  • Eutectics
  • Fatigue Life
  • Frequency
  • Heat Treatment
  • Materials
  • Materials Engineering
  • Materials Testing
  • Resistance
  • Superalloys
  • Surface Properties
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design