Abstract
This research focuses on work with emphasis on direct measurements of stresses during mesoscale microstructural deformation of nickel based super alloys during 3-point bending tests at elevated temperatures. A novel nano-mechanical Raman spectroscopy measurement platform was designed for temperature, stress, and chemistry mapping at micro to nano-scale for different temperature and loading conditions. During the 3-point bending test, notch tip plastic stresses as a function of microstructure, load, and temperature, with micron scale resolution were measured. The temperature field distribution was correlated to stress distribution and residual microstructure stresses around the area of the notch tip. Grain boundaries are the stress concentrated area but with lower temperature due to the contact thermal resistant. Grain boundary slide or grain rotation can result in stress concentration but enhance the ability of heat conduction and result in lower temperature. The mechanical properties which include the elastic modulus, hardness and stress-strain relation at the plastic zone around the notch tip were also measured. Instead of considering actual grain structures with different material properties, a new FE method was adopted to predict stress distribution applying the material properties which were obtained from indentation experiments around the same notch area as scanning. Predictions from theory and simulations matched closely in stress concentration area with experimental measurements. However, away from notch area a slight deviation due to microstructural effects was observed.
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Zhang, Y., Tomar, V. (2018). Characterization of Crack Tip Plasticity in IN-617 Using Indentation and Nano-Mechanical Raman Spectroscopy. In: Carroll, J., Xia, S., Beese, A., Berke, R., Pataky, G. (eds) Fracture, Fatigue, Failure and Damage Evolution, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-62831-8_3
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DOI: https://doi.org/10.1007/978-3-319-62831-8_3
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