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.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference4 articles.
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3. Nakai, Y. and Maeda, K., Observation of fatigue slip-band growth and crack initiation in a-brass under cyclic shear stresses by means of atomic-force microscopy, J. Materials Science, Japan, Vol. 52, No. 6 (2003), pp.625-630.
4. Taylor, G. I., Plastic strain in metals, J. Inst. Metals, 62, (1938) pp.307-324. Fig. 8. Analysis on SB and TC cracking with Taylor factor. (N=7800).
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