In-situ SEM study of slip-controlled short-crack growth in single-crystal nickel superalloy
journal contributionposted on 13.11.2018 by Lu Zhang, Liguo Zhao, Anish Roy, Vadim Silberschmidt, G. McColvin
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Initiation and growth of short cracks in a nickel-based single crystal were studied by carrying out in-situ fatigue experiments within a scanning electron microscope (SEM). Specimens with two different crystallographic orientations, i.e.,  and , were tested under load-controlled tension fatigue in vacuum. Slip-caused crack initiation was identified at room temperature while initiation of a mode-I crack was observed at 650°C. Slip traces continuously developed ahead of the crack tip once initiated and acted as nuclei for early-stage crack growth at both room and high temperature (650°C). These slip traces were caused by accumulated shear deformation of activated octahedral slip systems, which were specifically identified by analysing the surface slip traces and crack-propagation planes. The crack-growth rates were evaluated against stress intensity factor range, revealing the anomaly of slip-controlled short-crack growth. The effects of crystallographic orientations and temperature on fatigue crack growth were subsequently analysed and discussed, including the influence of microstructural features such as carbides and pores.
The work was funded by the EPSRC (Grant EP/M000966/1 and EP/K026844/1) of the UK and in collaboration with GE Power, Rolls-Royce and dstl.
- Mechanical, Electrical and Manufacturing Engineering