Abstract
Nickel-base Alloys 617 and 276 have been considered as structural material for turbine blades and nuclear hydrogen generation. The structural integrity of an engineering component is known to be influenced by the presence of surface irregularities such as cracks in the material. Hence Elastic plastic fracture mechanics base single compact tension specimen has been used to determine J1C value for ductile crack growth behavior of austenitic Alloy 617 and 276 as a function of temperature. Alloy 617 showed fairly constant resistance to fracture from ambient temperature up to 500°C for duplicate testing satisfying EPFM criteria. Whereas the J1C values of alloy 276 were gradually reduced with increasing temperature, the reduction being more pronounced from ambient temperature to 100°C. Efforts have been made to calculate the values of K1C and crack tip opening displacement for these alloys. Finally, fracture morphology in the loading and unloading sequences has been analyzed by SEM.
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Hasan, M.H., AL-Grafi, M. (2013). Determination of Fracture Toughness Values of Two Ni — Base Super Alloys for High Temperature Applications. In: Marquis, F. (eds) Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-48764-9_62
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DOI: https://doi.org/10.1007/978-3-319-48764-9_62
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