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Creep modeling and creep life estimation of Gr.91

Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 103 Issue 6

Abstract

The creep behavior and deciding factors for creep life have been investigated for Gr.91 in the temperature range between 450 and 725°C. The longest time to rupture was 68755 h. The creep life is inversely proportional to the minimum creep rate multiplied by the increase in creep rate by strain in the acceleration region for a wide range of test temperature and duration. The minimum creep rate depends on both the time to minimum creep rate and the strain to minimum creep rate. The strain to minimum creep rate decreases with decreasing stress, suggesting that the creep deformation in the transient region is significantly inhomogeneous at low stresses. The creep life is correlated with the creep deformation parameters in the transient region so that we can predict the creep life from a short-term creep test for up to the end of transient region, corresponding to less than 30% of the creep life, without any stress extrapolation.

Keywords: 9Cr steel; Creep life; Creep rate; Transient region; Acceleration region
* Correspondence address Dr. Fujio Abe National Institute for Materials Science 1-2-1 Sengen, Tsukuba 305-0047, Japan Tel.: +81 29 859 2115 Fax: +81 29 859 2101 E-mail:

Dedicated to Prof. Dr.-Ing. Christina Berger on the occasion of her 65th birthday

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Received: 2011-3-23
Accepted: 2012-2-15
Published Online: 2013-06-11
Published in Print: 2012-06-01

© 2012, Carl Hanser Verlag, München

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  2. Contents
  3. Original Contributions
  4. Diffusion characteristics in the Cu–Ti system
  5. Hydrogen permeability with dislocation in low carbon, aluminium-killed, enamel-grade steels
  6. Numerical simulation of the evolution of primary and secondary Nb(CN), Ti(CN) and AlN in Nb-microalloyed steel during continuous casting
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  8. Microstructure characterization in the weld joint of a high nickel austenitic alloy and Cr18-Ni8 stainless steel
  9. The reoptimization of the binary Se–Te system
  10. Phase diagram of the Sm–Dy–Fe ternary system
  11. Thermophysical properties of solid phase Ti-6Al-4V alloy over a wide temperature range
  12. Determination of mechanical properties by nanoindentation in the case of viscous materials
  13. Mechanical properties and biodegradable behavior of Mg–6%Zn–Ca3(PO4)2 metal matrix composites in Ringer's solution
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  15. Effect of pH on structure, morphology and optical properties of nanosized cupric oxide prepared by a simple hydrolysis method
  16. Metal-oxide-modified nanostructured carbon application as novel adsorbents for chromate ion removal from water
  17. Biological evaluation of micro-nanoporous layer on Ti–Ag alloy for dental implant
  18. Design of damage tolerance in high-strength steels
  19. Creep modeling and creep life estimation of Gr.91
  20. Influence of the layer architecture of DLC coatings on their wear and corrosion resistance
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  22. Short Communications
  23. Discussion of defect analysis of a Ti-6Al-4V alloy forging ring
  24. DGM News
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https://doi.org/10.3139/146.110769
Keywords for this article
9Cr steel; Creep life; Creep rate; Transient region; Acceleration region

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusion characteristics in the Cu–Ti system
  5. Hydrogen permeability with dislocation in low carbon, aluminium-killed, enamel-grade steels
  6. Numerical simulation of the evolution of primary and secondary Nb(CN), Ti(CN) and AlN in Nb-microalloyed steel during continuous casting
  7. Microstructure evolution in a 2618 aluminium alloy during creep-fatigue tests
  8. Microstructure characterization in the weld joint of a high nickel austenitic alloy and Cr18-Ni8 stainless steel
  9. The reoptimization of the binary Se–Te system
  10. Phase diagram of the Sm–Dy–Fe ternary system
  11. Thermophysical properties of solid phase Ti-6Al-4V alloy over a wide temperature range
  12. Determination of mechanical properties by nanoindentation in the case of viscous materials
  13. Mechanical properties and biodegradable behavior of Mg–6%Zn–Ca3(PO4)2 metal matrix composites in Ringer's solution
  14. Effect of Ti addition on the wettability of Al–B4C metal matrix composites
  15. Effect of pH on structure, morphology and optical properties of nanosized cupric oxide prepared by a simple hydrolysis method
  16. Metal-oxide-modified nanostructured carbon application as novel adsorbents for chromate ion removal from water
  17. Biological evaluation of micro-nanoporous layer on Ti–Ag alloy for dental implant
  18. Design of damage tolerance in high-strength steels
  19. Creep modeling and creep life estimation of Gr.91
  20. Influence of the layer architecture of DLC coatings on their wear and corrosion resistance
  21. Potential of mechanical surface treatment for mould and die production
  22. Short Communications
  23. Discussion of defect analysis of a Ti-6Al-4V alloy forging ring
  24. DGM News
  25. DGM News
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