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Creep of Heat-Resistant Steels

  • Wei YanEmail author
  • Wei Wang
  • Yiyin Shan
  • Ke Yang
  • Wei Sha
Chapter
Part of the Engineering Materials book series (ENG.MAT.)

Abstract

The first part of this chapter addresses the overestimation of the time–temperature parameter method on the allowable creep strength of 9–12 %Cr heat-resistant steels. Creep data of 9 %Cr heat-resistant steels are divided into several ranges according to the creep controlling mechanism. The physically based continuum creep damage mechanics could provide a unified framework for predicting the creep life of steels working at elevated temperature. It is used to analyse the creep rupture properties of a heat-resistant steel used in the supercritical power generation, based on the current experimental database. In the microstructure after creep, the martensitic laths grow in size with time and eventually develop into a subgrain structure. Laves phase grows and collects along the prior austenite grain boundaries during creep and causes the fluctuation of solution and precipitation strengthening effects. The deformed part of the creep specimen has lower hardness than the aged part because stress can accelerate the microstructure evolution. In the final part of the chapter, the creep rupture mechanism of heat-resistant steel under different stress levels is discussed. Under conditions of high stress, the creep rupture mechanism is similar to the ductile fracture at room temperature. This changes to brittle fracture under low stress levels.

Keywords

Stress Exponent Lave Phase 10Cr Steel Minimum Creep Rate Rupture Life 
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

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Wei Yan
    • 1
    Email author
  • Wei Wang
    • 1
  • Yiyin Shan
    • 1
  • Ke Yang
    • 1
  • Wei Sha
    • 2
  1. 1.Institute of Metal Research, Chinese Academy of SciencesShenyangChina
  2. 2.Queen’s University BelfastBelfastUK

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