Paper Title:
Co Addition Effect on the Precipitation Behavior of Laves Phase in Fe-10Cr Ferritic Alloy
  Abstract

Ferritic heat-resistant steel comprises basic alloys of Fe-10mass%Cr-W. This study investigates how stress, the addition of Co, and tempering before aging affect the precipitation of the Laves phase of Fe-10Cr-6W ferritic heat-resistant steel, which is used in ultra-supercritical power plants and nuclear reactor materials. The study also investigates the mechanical properties of the steel. Precipitation of the Laves phase by aging increases the tensile strength, but decreases the elongation and impact strength of the alloys. Toughness of the alloys decreases greatly as very fine disk-like Laves phases appear in early aging stage. The strength and impact value of the steel decrease when the steel is tempered before aging. This is mainly due to decrease of density and increase of the particle size in the Laves phase. Since precipitation of the Laves phase increases by addition of Co; the strength increases and the elongation and impact value decrease.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
1745-1748
DOI
10.4028/www.scientific.net/MSF.561-565.1745
Citation
I. S. Kim, S.M. Lee, J. Y. Kim, Y. Watanabe, H. Sato, Z. G. Zhang, H.R. Jung, C. Y. Kang, "Co Addition Effect on the Precipitation Behavior of Laves Phase in Fe-10Cr Ferritic Alloy", Materials Science Forum, Vols. 561-565, pp. 1745-1748, 2007
Online since
October 2007
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