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Title: In-situ SEM study of slip-controlled short-crack growth in single-crystal nickel superalloy
Authors: Zhang, Lu
Zhao, Liguo
Roy, Anish
Silberschmidt, Vadim V.
McColvin, G.
Keywords: In-situ SEM test
Single crystal
Crack initiation
Short-crack growth
Crystal orientation
Crack-growth rate
Issue Date: 2018
Publisher: Elsevier (© the authors)
Citation: ZHANG, L. ... et al., 2018. In-situ SEM study of slip-controlled short-crack growth in single-crystal nickel superalloy. Materials Science and Engineering: A, 742, pp.564-572
Abstract: 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., [001] and [111], 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.
Description: This paper was published by Elsevier as Gold Open Access with a Creative Commons Attribution (CC BY 4.0) licence.
Sponsor: 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.
Version: Published
DOI: 10.1016/j.msea.2018.11.040
URI: https://dspace.lboro.ac.uk/2134/35937
Publisher Link: https://doi.org/10.1016/j.msea.2018.11.040
ISSN: 0921-5093
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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