Author
Bruck, Gerald J.
Other Contributors
Savage, Warren F.; Johnston, William G.; Corelli, John C.; Nippes, E. F. (Ernest Frederick); Malaviya, B. K.;
Date Issued
1977-06
Subject
Nuclear engineering
Degree
PhD;
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
Abstract
Changes in concentration of both major components and minor elements in an iron-chromium-nickel base alloy dramatically affect susceptibility to radiation-induced swelling. Substantial changes in composition occur in a weld as a result of segregation during solidification. In homogeneous swelling should then occur in irradiated weld metal in a manner related to the inhomogeneity in composition.; Such swelling inhomogeneity has been observed in a welded 65Fe-15Cr-20Ni base alloy modified with, the swelling inhibitors, silicon (0.35 w/o) plus titanium (0.1 w/o). Swelling at cell boundaries is approximately one-half the swelling at cell surfaces. Electron microprobe analysis revealed that the magnitude and variations in swelling are attributable to microsegregation of iron, chromium, nickel and silicon. Titanium is apparently ineffective. In addition, energy dispersive X-ray analysis indicated that micron and submicron titanium-rich particles formed during solidification and, thus, removed titanium from solution as a swelling inhibitor.; In unmodified base alloy material the spatial distribution of void swelling was nearly uniform irrespective of cellular substructure and microsegregation. However, modification of the base alloy material with 0.5 w/o zirconium, 0.7 w/o silicon or 0.3 w/o silicon dramatically reduced overall weld metal swelling. Some shielding gas effects and a sample heat-affected-zone were also studied.;
Description
June 1977; School of Engineering
Department
Dept. of Mechanical, Aerospace, and Nuclear Engineering;
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection;
Access
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
