Paper Title:
Influence of Si Content on the Oxide Scale Formation of Ni-Based Alloy
  Abstract

Effects of silicon concentrations in Ni-Cr-based alloys on the formation of oxide scales were examined in reduced atmosphere. The morphology and oxide scale were compared based on the Si content. The formation and growth kinetics of the oxide scale are rather sensitive to the alloy microstructures and their corresponding Si contents. Oxide ridges formed on the eutectic structure preferentially, while a thinner and homogeneous oxide scale grew from the austenite matrix. The thicknesses of the oxide ridges and the oxide layer on the austenite matrix are dependent of their corresponding Si contents. The ridge-like feature indicates that the austenite/carbide phase boundaries offer fast diffusion paths for metal atom outward diffusion. The formation of SiO2 sub-layer at the oxide scale/metal interface can act as an effective diffusion barrier for atom outward diffusion.

  Info
Periodical
Advanced Materials Research (Volumes 79-82)
Edited by
Yansheng Yin and Xin Wang
Pages
2239-2242
DOI
10.4028/www.scientific.net/AMR.79-82.2239
Citation
C. Lei, L. X. Chen, N. Zhang, Y. S. Yin, "Influence of Si Content on the Oxide Scale Formation of Ni-Based Alloy", Advanced Materials Research, Vols. 79-82, pp. 2239-2242, 2009
Online since
August 2009
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$32.00
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