Microstructural Instabilities in Single Crystal Metals for Extreme Environments

Abstract

As the US Air Force fleet continues to age, a greater portion of its budget will be required to ensure safe and effective operations beyond the design service life. In fact, for various military vehicles and platforms, the recommended service life for safe operation is projected to increase by a factor of 1.5 to 5 (AFRL, 2014). The high demand for safety and cost reduction culminates in the case of materials systems operating under extreme environments such as turbine blades made of Ni-based single crystal superalloys. Turbine blades are used in the hot section of the engine and are, therefore, subjected to multiaxial high-temperature viscoplastic deformations, namely, creep and dwell/fatigue, due to both their complex geometry and their advanced design, e.g., internal cooling channels aimed to increase the exhaust-gas temperature during in-service operations.

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Document Details

Document Type
Technical Report
Publication Date
Sep 27, 2021
Accession Number
AD1155227

Entities

People

  • Jean-briac Le Graverend

Organizations

  • Texas Engineering Experiment Station

Tags

Communities of Interest

  • Human Systems
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Creep
  • Creep Tests
  • Engineering
  • Extreme Environments
  • Geometry
  • High Temperature
  • Integrated Computational Materials Engineering
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Mechanics
  • Notch Sensitivity
  • Phase Transformations
  • Plastic Properties
  • Scientific Research
  • Single Crystals
  • Stress Strain Relations
  • Stresses
  • Three Dimensional
  • Turbine Blades

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design