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On the interaction of ductile damage and materials softening of a Ni-base alloy during hot deformation

  • Guntram Rüf , Christof Sommitsch and Bruno Buchmayr
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 11

Abstract

Macro- and micromechanically motivated damage models have been validated in the critical temperature range of 900 °C – 1000 °C with respect to their applicability and precision in fracture prediction using a commercial finite element code and by the means of an experimental database. The evaluation of the experimental and the calculated fracture strains corresponding to an averaged critical damage value shows major deviation for all models except the model of effective stresses based on the work of Lemaitre. The results have been improved further for 1000 °C either by using a microstructure model to consider dynamic recrystallization or the coupling of the flow stress and the damage parameter calculation.

Electron backscatter diffraction analysis showed that cracks always started at grain boundaries but with the onset of dynamic recrystallization at higher temperatures crack growth also seems to take place within recrystallized grains.

Keywords: Damage; Dynamic recrystallization; Hot forming; Nickel-based superalloys; Crack initiation
* Correspondence address, MSc Guntram Rüf, University of Leoben, Department Product Engineering, Chair of Metal Forming, Franz-Josef-Straße 18, A-8700 Leoben, Austria, Tel.: +43 3842 402 5611, Fax: +43 3842 402 5602, E-mail:

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Received: 2007-4-10
Accepted: 2007-8-2
Published Online: 2013-05-23
Published in Print: 2007-11-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101566
Keywords for this article
Damage; Dynamic recrystallization; Hot forming; Nickel-based superalloys; Crack initiation

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Professor Dr. phil. Dr. techn. e. h. Hellmut F. Fischmeister
  5. Basic
  6. Compressive deformation of lamellar microstructures – a short review
  7. Influence of external and internal length scale on the flow stress of copper
  8. Spinodal decomposition of cubic Ti1−xAlxN: Comparison between experiments and modeling
  9. Combined ab-initio and N-K, Ti-L2,3, V-L2,3 electron energy-loss near edge structure studies for TiN and VN films
  10. Gold-enhanced oxidation of silicon nanowires
  11. Numerical determination of parameterised failure curves for ductile structural materials
  12. Relaxation of semiconductor nanostructures using molecular dynamics with analytic bond order potentials*
  13. Examination of phase transformations in the system Fe–N–C by means of nitrocarburising reactions and secondary annealing experiments; the α + ∊ two-phase equilibrium
  14. Applied
  15. On the evolution of secondary hardening carbides in a high-speed steel characterised by APFIM and SANS
  16. Silicon nitride tools for hot rolling of high-alloyed steel and superalloy wires – load analysis and first practical tests
  17. Development of the unloading stiffness during cyclic plastic deformation of a high-strength aluminium alloy in different tempers
  18. Enhanced thermal stability of a cobalt–boron carbide nanocomposite by ion-implantation
  19. Experimental studies and thermodynamic simulation of phase transformations in high Nb containing γ-TiAl based alloys
  20. Kinetics of nanoscale structure development during Mg-vapour reduction of tantalum oxide
  21. On the interaction of ductile damage and materials softening of a Ni-base alloy during hot deformation
  22. Adhesive contact between flat punches with finite edge radius and an elastic half-space
  23. Notifications
  24. DGM News
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