Dr. Soumya Mohan thesis investigated the phase transformation behavior in 2.25Cr-1Mo steel submerged arc weld microstructures and its effect on their low temperature impact toughness. She is currently a Research Engineer I at Georgia Institute of Technology with Prof. Aaron Stebner as principal investigator. Her research goals are designing alloys for additively manufacturing to improve printability and performance. Her research interests include mechanical properties of structural materials, spherical indentation, thermodynamics of phase transformations, welding and joining.
Currently, Soumya is working in collaboration with Elementum3D to optimize compositions for additively manufactured Aluminum 5xxx series alloy to combat hot cracking and improve yield strengths. She is approaching this by using CALPHAD calculations to optimize over a heuristically determined cost function.
Additionally, for her second project, she aims to select alloying elements that would improve the tensile properties of NiTi Shape memory alloys and Printing dislocation cells into NiTi shape memory alloys. After theoretically selecting alloying additions, AM builds will be characterized for desired microstructures, i.e., dislocation cells.
Previously, her research in Georgia Tech with Prof. Kalidindi was focused on multiresolution high throughput mechanical characterization of metals using spherical indentation. Her primary research was in collaboration with Air Force Research Lab, focusing on extracting single crystal elastic plastic properties of titanium alloys as a function of composition and microstructure features. It involved using spherical nanoindentation to extract single crystal elastic-plastic properties of titanium alloys as a function of composition and microstructure features. She investigated the anisotropic mechanical response of single Ti6Al-4V colonies as a function of colony alpha orientation. Additionally, she had research collaborations with Air Force Research Lab, OCAS Company (Belgium), Sandia National Lab, and Indian Institute of Science, Bengaluru. Her work with OCAS provided experimental validation of the relation between tensile yield strength and spherical indentation yield strength for 30 steels with tensile yield strengths ranging from 300 MPa to 1400 MPa, as well as quantified the effect of sample thickness on the spherical indentation stress-strain response. She was able to recommend a minimum sample size for accurate prediction of uniaxial yield strength.