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Cross-Sectional Sample Preparation and Analysis of Intergranular Stress Corrosion Cracks in FE-NI-CR Alloys.

Published online by Cambridge University Press:  02 July 2020

L.E. Thomas  and
S.M. Bruemmer
L.E. Thomas
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, WA99352
S.M. Bruemmer
Affiliation:
Pacific Northwest National Laboratory, Richland, WA99353
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Extract

Transmission electron microscopy in its modern high-resolution analytical form has great potential for elucidating mechanisms of environmental cracking in structural alloys and other materials. Apart from a few pioneering efforts, the difficulties of preparing suitable samples with the original corrosion structures preserved in narrow crack tips have limited contributions of TEM in this area. Recent work involving cross-sectional crack preparation has focused on intergranular stress-corrosion cracking of Fe- and Ni-base stainless alloys in high-temperature water. This presentation will illustrate preparation methods that have proven successful, and describe limitations of the analysis.

The method for preparing cross-section samples suitable for high-resolution TEM characterization is based on earlier work by Lewis et al. It involves preparing a thin section containing cracks filled with epoxy, dimple grinding selected locations near the crack tip, and ion milling. Figure 1 schematically illustrates this method. The first step is to preserve the crack opening characteristics present under loading and protect the crack surfaces during thinning.

Type
Precision Specimen Preparation
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 884 - 885
Copyright
Copyright © Microscopy Society of America

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References

1.Scamans, G.M. and Swann, P.R., Corrosion Sci. 18 (1978) 983.CrossRefGoogle Scholar
2.Newcombe, S.B., Boothroyd, C.B., and Stobbs, W.M., J. Micros., 140 (1985) 195.CrossRefGoogle Scholar
3.Nisbet, W.J., Lorimer, G.W., and Newman, R.C., Corrosion Sci. 35 (1993) 457.CrossRefGoogle Scholar
4.Lewis, N., Perry, D.J., and Bunch, M.L., Proc. Ann MSA Meeting (1995) 550.CrossRefGoogle Scholar