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EBSD-AFM Hybrid Analysis of Crack Initiation in Stainless Steel under Fatigue Loading

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Abstract:

Both EBSD and AFM methods were used to investigate the active slip systems and fatigue crack initiation behavior in face-centered cubic polycrystalline metal, austenitic stainless steel, SUS316NG, under cyclic torsional loading. Most active slip planes are the primary slip planes having the largest Schmid factor. Grains with slip band cracks or transcrystalline cracks have larger Taylor's factors. On the basis of EBSD and AFM observations, h, the depth of intrusion vertical to the surface, S, and the component of the slip displacement perpendicular to the surface trace, SB, showed a sharp increase at the onset of crack initiation. The critical value of SB at crack initiation was 170 nm.

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Periodical:

Key Engineering Materials (Volumes 340-341)

Pages:

531-536

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.340-341.531

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Online since:

June 2007

Authors:

Yun Wang, Hidehiko Kimura, Yoshiaki Akiniwa, Keisuke Tanaka

Keywords:

Atomic Force Microscope (AFM), Electron Backscatter Diffraction (EBSD), Fatigue Crack Initiation, Schmid Factor, Slip Band Cracks, Stainless Steel (SS), Surface Topography, Taylor Factor

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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