Dr. William Andrew Hearn

William Hearn
Paul Scherrer Institut
Forschungsstrasse 111
5232 Villigen PSI

William Hearn is a postdoctoral researcher in the Structure and Mechanics of Advanced Materials group (SMAM). He recieved his bachelor’s degree in Materials Science and Engineering from the University of Toronto, and recieved his master’s degree in Materials Engineering from the University of Alberta where he was part of the Advanced Materials & Processing Laboratory (AMPL). He then obtained his PhD from Chalmers University of Technology where he was part of the Centre for Additive Manufacture – Metal (CAM2). His PhD work focused on the development of new materials for additive manufacturing technologies, specifically the development of structural steels for PBF-LB. After his PhD, he joined the SMAM group in 2023 to study the optimization of acoustic emissions for miniaturized PBF-LB systems during operando x-ray diffraction and imaging experiments.

William’s research focuses on the development and optimization of acoustic emissions to capture phenomena during PBF-LB such as defect formation, phase transformations and recrystallization. This involves correlating recorded acoustic emissions to results from operando synchrotron X-ray diffraction and imaging experiments.

An extensive overview of publication can be found on Google Scholar or on ResearchGate.

Selected Publications:

Hearn. W, Harlin, P., and Hryha, E., "Development of powder bed fusion – laser beam process for AISI 4140, 4340 and 8620 low-alloy steel", Powder Metallurgy, Vol. 66, pp. 94-106 (2023) https://doi.org/10.1080/00325899.2022.2134083

Hearn. W, Lindgren, K., Persson, J., and Hryha, E., "In situ tempering of martensite during laser powder bed fusion of Fe-0.45C steel", Materialia, Vol. 23, 101459 (2022) https://doi.org/10.1016/j.mtla.2022.101459

Hearn. W, and Hryha, E., " Effect of Carbon Content on the Processability of Fe-C Alloys Produced by Laser Based Powder Bed Fusion", Frontiers in Materials, Vol. 8, (2022) https://doi.org/10.3389/fmats.2021.800021

Hearn. W, Bogno, A-A.., Spinelli, J., Valloton, J., and Henein, H., " Microstructure Solidification Maps for Al-10 Wt Pct Si Alloys", Metallurgical and Materials Transactions A, Vol. 50, pp. 1333-1345 (2019) https://doi.org/10.1007/s11661-018-5093-2