A study of fatigue mesoscopic elasto-plastic properties of a nickel-base superalloy by instrumented microindentation measurements |
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| Authors: | Duyi Ye Haibo Cha Lei Xiao Xuandong Xu |
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| Affiliation: | 1. Institute of Plasma Physics of the Czech Academy of Sciences, Za Slovankou 3, 182 00 Prague 8, Czech Republic;2. Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague 6, Czech Republic;3. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 115 19 Prague 1, Czech Republic;1. Architecture, Built Environment and Construction Engineering Department, Politecnico di Milano (Technical University), Piazza Leonardo da Vinci 32, 20133, Italy;2. University of Belgrade, Faculty of Mechanical Engineering, Department of Strength of Materials, Kraljice Marije 16, Belgrade, Serbia;3. School of Engineering and Science, Curtin University, Sarawak 98009, Malaysia;4. School of Civil Engineering, The University of Sydney, Sydney, NSW 2006, Australia;5. Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, NSW 2006, Australia;6. ARC Centre of Excellence for Design in Light Metals, The University of Sydney, Sydney, NSW 2006, Australia;7. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;1. Division of Toxicological Research and Evaluation, Korea Institute of Toxicology, Daejeon, Republic of Korea;2. Moghu Research Center Ltd., Daejeon, Republic of Korea |
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| Abstract: | In this study the fatigue mesoscopic elasto-plastic properties of nickel-base superalloy GH4145/SQ were investigated using the instrumented microindentation testing coupled with the analytic calculation. The indentation characteristic parameters of low-cycle fatigue specimens, such as the indentation curvature (C), the maximum penetration depth (hmax), the initial unloading slope (S), the residual depth of penetration (hr), the recovered elastic work (We) and the residual plastic work (Wp), were determined from the experimental load–penetration depth (P–h) curves, and the fatigue mesoscopic elasto-plastic properties (E, σy and n) were estimated using a well-developed analysis algorithm proposed by Dao et al. The distribution patterns of the fatigue mesoscopic mechanical properties were further verified in a statistical sense. The dependence of the fatigue mesoscopic elasto-plastic properties upon the imposed strain amplitude was discussed preliminarily in terms of microstructural examinations of fatigue failure specimens. |
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