Influence of Si content on the Oxide scale formation of Ni-based alloy
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.
Ni-based alloy microstructure oxide scale Si content
Chu Lei LiXiang-chen Zhang Ning Yansheng Yin
Institute of Materials Science and Engineering, Ocean University of China, QingDao, 266100 Institute of Materials Science and Engineering, Ocean University of China, QingDao, 266100 College o
国际会议
青岛
英文
2239-2242
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）