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Metallurgical Transactions A

, Volume 7, Issue 11, pp 1785–1791 | Cite as

The high temperature creep and fracture behavior of a 1-pct CrMoV rotor steel

Transformations

Abstract

The creep and fracture behavior of a low alloy ferritic steel has been studied between 220 and 340 MN/m2 at 823 and 838 K. Over most of the creep life the creep strain could be represented by: ε-εo + εT (l-e-mt ) + εst + χL e p (t-t t) where εo is the instantaneous strain on loading, εT the total transient strain,m a parameter relating to the rate of exhaustion of transient creep,t the time, εs the steady creep rate,t t the time to the onset of tertiary creep and εL andp are tertiary creep parameters. The steady-state creep rate was related to applied stress and temperature by: ε=AΣa 17 exp(RT/-397,000)

It has been shown that creep is recovery controlled. The good creep resistance of this alloy is due to the presence of vanadium carbide precipitate which inhibits recovery of the dislocation network and introduces a friction stress(Σ o) opposing deformation. Measurements of Σo have been made and when the creep processes were considered in terms of(Σ a-Σo) it was found thatε=A′ (Σ a-Σo exp (RT- 240,000 )

Under puch circumstances the stress and temperature dependence of the creep rate were similar to those predicted by the recovery theory of creep.

Keywords

Metallurgical Transaction Bainite Creep Rate Creep Strain Creep Behavior 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical of Society of AIME 1976

Authors and Affiliations

  • D. Side
    • 1
  1. 1.Christ’s CollegeCambridgeEngland

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