Abstract
This article discusses determination of threshold stress intensity for propagation of stress corrosion cracking (K ISCC), using circumferential notch tensile (CNT) specimens. Use of round tensile specimens is a novel and cost-advantageous approach to determination of K ISCC. However, compliance of this specimen geometry to the constraints for application of linear elastic fracture mechanics (LEFM) has traditionally been argued, and hence this aspect is addressed in detail. The LEFM suits best the materials that undergo brittle cracking, and hence a highly brittle material, cast iron, has been selected as the test material. However, susceptibility of this material to caustic embrittlement has been established employing another technique, viz. slow strain rate testing and fractography of the specimens. Using CNT specimens, K ISCC has been determined for the cast iron in hot caustic solutions, and the features of intergranular caustic cracking and secondary cracking have been established using scanning electron microscopy.
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An erratum to this article can be found online at http://dx.doi.org/10.1007/s11661-017-4327-z.
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Singh Raman, R.K., Rihan, R. & Ibrahim, R.N. A novel approach to the determination of the threshold for stress corrosion cracking (K ISCC) using round tensile specimens. Metall Mater Trans A 37, 2963–2973 (2006). https://doi.org/10.1007/s11661-006-0178-8
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DOI: https://doi.org/10.1007/s11661-006-0178-8