Influence of Grain Boundary Character on Creep Void Formation in Alloy 617

Authors

Thomas Lillo, Idaho National Laboratory
James Cole, Idaho National Laboratory
Megan Frary, Boise State UniversityFollow
Scott Schlegel, Boise State University

Document Type

Article

Publication Date

12-1-2009

Abstract

Alloy 617, a high temperature creep-resistant, nickel-based alloy, is being considered for the primary heat exchanger for the Next Generation Nuclear Plant (NGNP) which will operate at temperatures exceeding 760^oC. Orientation imaging microscopy (OIM) is used to characterize the grain boundaries in the vicinity of creep voids that develop during high temperature creep tests (800-1000^oC at creep stresses ranging from 20-85 MPa) terminated at creep strains ranging from 5-40%. Observations using optical microscopy indicate creep rate does not significantly influence the creep void fraction at a given creep strain. Preliminary analysis of the OIM data indicates voids tend to form on grain boundaries parallel, perpendicular or 45^o to the tensile axis, while few voids are found at intermediate inclinations to the tensile axis. Random grain boundaries intersect most voids while CSL-related grain boundaries did not appear to be consistently associated with void development.

Copyright Statement

This is an author-produced, peer-reviewed version of this article. The final publication is available at www.springerlink.com. Copyright restrictions may apply. DOI: 10.1007/s11661-009-0051-7

Publication Information

Lillo, Thomas; Cole, James; Frary, Megan; and Schlegel, Scott. (2009). "Influence of Grain Boundary Character on Creep Void Formation in Alloy 617". Metallurgical and Materials Transactions A, 40(12), 2803-2811. https://doi.org/10.1016/j.msea.2006.12.206