Creep, Damage and Life Prediction for High Temperature Materials.

Abstract

The high-temperature static failure mechanisms of several representative superalloys (Inconel 718, 800 and 783) were studied under controlled loading and environmental conditions. As part of this experimental program, high temperature Digital Image Correlation was applied to measure local deformation fields of fracture mechanics specimens. The measured deformations were compared to those predicted by various creep fracture theories and by finite element models. Such comparisons, combined with metallographic and fractographic evidence, support the theory that the micromechanisms of failure are strongly influenced by the occurrence of stress-accelerated grain boundary oxygen embrittlement. Consequently, a constitutive model that describes the combined effects of creep damage and oxygen embrittlement for superalloys at elevated temperatures and under oxidizing environments has been developed.

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Document Details

Document Type
Technical Report
Publication Date
Dec 17, 1997
Accession Number
ADA342444

Entities

People

  • Bill Y. Chao
  • Jed S. Lyons
  • Michael A. Sutton
  • Xiaomin Deng

Organizations

  • University of South Carolina

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Boundaries
  • Computational Science
  • Computer Programs
  • Computers
  • Creep
  • Digital Images
  • Embrittlement
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Grain Boundaries
  • High Temperature
  • Materials
  • Materials Science
  • Mechanical Engineering
  • Mechanics
  • Turbines

Readers

  • Materials Science (Mechanical Engineering).