|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||In Operando Nano- and Micro-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||Characterization of High Temperature Crack Tip Plasticity and Size Effect in Alloy 617 Using Nanomechanical Raman Spectroscopy and High Temperature Indentation
||Yang Zhang, Vikas Tomar
|On-Site Speaker (Planned)
In this research, alloy 617, a solid solution Ni-Cr-Mo superalloy, was studied in the temperature range of room temperature to 1073 K (800 C) for temperature dependent strength and crack tip plasticity. Combined nanoindentation and nano mechanical Raman spectroscopy methods were used to measure crack tip plastic zone and stress distribution around the crack tip that can influence the crack propagation. Indentation size effect (ISE) was studied in terms of hardness variation as a function of loading depth and temperature. The mean hardness values varied from 1.752 GPa to 0.939 GPa with temperature variation from room temperature to 1073 K. The resulting strain gradient length scale variation was from 5.669 microns at room temperature to 2.458 microns at 1073 K. Then the 3 points bending tests were performed on the samples with an initial crack to predict crack tip plastic stresses under applied load with micron scale resolution.
||Planned: A print-only volume