The σ0 Approach to Creep and Fracture of Metals and Alloys

  • B. Wilshire
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Summary

The different values reported for the stress and temperature dependences of the creep rates for a wide range of metals and alloys can be rationalized as
$$ \dot \varepsilon _s = A*(\sigma - \sigma _o )^P \exp ^{ - Q*_c } /RT $$
The parameter, σo, varies with stress and temperature such that p ≃ 4 and Q c * for particle-strengthened alloys is equal to the activation energy for creep of the single-phase matrix material. The physical significance of σo is considered in terms of the mechanisms controlling creep in various stress/temperature regimes and the approach developed is used to examine the effects of microstructural changes during long-term exposure of low-alloy steels and nickel-base super-alloys at elevated temperatures.

Keywords

Nickel Carbide Ferrite Cobalt Vanadium 

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Copyright information

© Springer-Verlag, Berlin, Heidelberg 1981

Authors and Affiliations

  • B. Wilshire
    • 1
  1. 1.Department of Metallurgy and Materials TechnologyUniversity CollegeSingleton Park, SwanseaUK

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