Please use this identifier to cite or link to this item: doi:10.22028/D291-23817
Title: ODS-Legierungen : abnormales Kornwachstum im Temperaturgradienten
Author(s): Lempenauer, Klaus
Arzt, Eduard
Language: English
Year of Publication: 1992
OPUS Source: Zeitschrift für Metallkunde. - 83. 1992, 6, S. 423-428
SWD key words: ODS-Superlegierung
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Abnormal grain growth in ODS superalloys, which leads to the desired coarse grain structures, was examined. A heat treatment in a temperature gradient (i.e. zone annealing) causes directional grain growth producing very elongated grain structures. Two temperature limits were determined which control the abnormal grain growth process: an "initiation temperature" (T(aKw)) which must be reached to initiate the process, and a "minimum temperature" (T(w)) required to maintain abnormal growth. T(w) is always lower than T(aKw) both of which define the temperature range in which abnormal grain growth occurs continuously during zone annealing without the "nucleation" of new coarse grains. The physical explanation of these two temperatures is associated with the mechanisms of the onset and the propagation of abnormal grain growth. These mechanisms can be best understood by the influence of foreign atoms on grain boundary motion (impurity-drag theory).
Link to this record: urn:nbn:de:bsz:291-scidok-17588
Date of registration: 18-Nov-2008
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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