Numerical analysis of surface cracks at regions of curvature in oxide scales

2003 ◽  
Vol 342 (1-2) ◽  
pp. 109-119 ◽  
Author(s):  
R.L. Williamson ◽  
J.K. Wright ◽  
E.D. Steffler ◽  
R.M. Cannon
Keyword(s):  
Numerical Analysis ◽  
Surface Cracks ◽  
Oxide Scales

A numerical analysis based on M-integral about the interaction of parallel surface cracks in an infinite plate

2018 ◽  
Vol 96 ◽  
pp. 370-379 ◽  
Author(s):  
Fei Lv ◽  
Chang-Yu Zhou ◽  
Rui-Jia Cheng ◽  
Xin-Ting Miao ◽  
Xiao-Hua He
Keyword(s):  
Numerical Analysis ◽  
Infinite Plate ◽  
Surface Cracks ◽  
Parallel Surface ◽  
M Integral

The Microstructure of Nickel Oxide Scales

1981 ◽  
Vol 39 ◽  
pp. 86-87
Author(s):  
M. T. Tinker ◽  
L. W. Hobbs
Keyword(s):  
Electron Microscopy ◽  
Nickel Oxide ◽  
Ion Beam ◽  
Oxide Scales ◽  
Nickel Substrate ◽  
Outward Diffusion ◽  
Transmission Electron ◽  
Nickel Substrates ◽  
Nickel Base ◽  
Technological Interest

There is considerable technological interest in oxidation of nickel because of the importance of nickel-base superalloys in high-temperature oxidizing environments. NiO scales on nickel grow classically, by outward diffusion of nickel through the scale, and are among the most studied of oxidation systems. We report here the first extensive characterization by transmission electron microscopy of nickel oxide scales formed on bulk nickel substrates and sectioned both parallel and transversely to the Ni/NiO interface.Electrochemically-polished nickel sheet of 99.995% purity was oxidized at 1273 K in 0.1 MPa oxygen partial pressure for times between 5 s and 25 h. Parallel sections were produced using a combination of electropolishing of the nickel substrate and ion-beam thinning of the scale to any desired depth in the scale. Transverse sections were prepared by encasing stacked strips of oxidized nickel sheet in epoxy resin, sectioning transversely and ion-beam thinning until thin area spanning one or more interfaces was obtained.

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