Paper Title:
Intergranular Strain and Phase Transformation in a Cobalt-Based Superalloy
  Abstract

ULTIMET® alloy, a cobalt-based superalloy with good corrosion and wear resistant properties, exhibits a deformation-induced phase transformation from the face-centered-cubic (FCC) phase to the hexagonal-close-packed (HCP) phase. The HCP phase formation during monotonic tensile loading was investigated using in-situ neutron diffraction. The HCP phase is first observed at a stress level of 810 MPa, which is well beyond macroscopic yielding. Strain analysis is performed on the FCC phase diffraction data in order to relate the lattice-strain development with the evolution of the new HCP phase. A method of calculating the effective macroscopic stress associated with the measured lattice strains is presented here. The effective stress can then be compared to the applied macroscopic stress in order to draw conclusions about the load-partitioning behavior of the material as a new phase develops.

  Info
Periodical
Materials Science Forum (Volumes 524-525)
Edited by
W. Reimers and S. Quander
Pages
893-898
DOI
10.4028/www.scientific.net/MSF.524-525.893
Citation
M. L. Benson, A.D. Stoica, P. K. Liaw, H. Choo, T.A. Saleh, X.L. Wang, D. W. Brown, D. L. Klarstrom, "Intergranular Strain and Phase Transformation in a Cobalt-Based Superalloy", Materials Science Forum, Vols. 524-525, pp. 893-898, 2006
Online since
September 2006
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$32.00
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