Paper Title:
Creep Behavior and Microstructure of 8Cr Oxide Dispersion Strengthened Martensitic Steel
  Abstract

In international thermonuclear experimental reactor (ITER), reduced activation ferritic/martensitic steels will be used for plasma-facing materials. However, it is necessary to raise the temperature of operation in order to elevate efficiency of electric power generation by using the material which is more excellent in strength at elevated temperature. Oxide dispersion strengthened (ODS) steels are promising candidate for high temperature materials of a nuclear fusion reactor. There are many reports that ODS steels show very high creep strength, but there are few reports on creep deformation mechanism. In this work, creep deformation behavior of 8 wt% Cr ODS steel was investigated. This ODS steel had high density of fine dispersed Y2Ti2O7 particles and -ferrite grains elongated along the hot-rolling direction. The creep curve showed a low creep strain rate until specimen ruptured. Vickers hardness of the gauge part of specimens in interrupted creep tests decreased with increasing the loading time. However, that of the grip part did not change significantly. Accordingly, although dynamic recovery occurred in the ODS steel, it had not affected the creep deformation rate.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
2309-2314
DOI
10.4028/www.scientific.net/MSF.638-642.2309
Citation
K. Shinozuka, H. Esaka, M. Tamura, H. Tanigawa, "Creep Behavior and Microstructure of 8Cr Oxide Dispersion Strengthened Martensitic Steel", Materials Science Forum, Vols. 638-642, pp. 2309-2314, 2010
Online since
January 2010
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$32.00
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