Authors:
Aurore Leclercq (1), Thibault Mouret (1), Vladimir Brailovski (1)
1- École de Technologie Supérieure, Montréal, Canada
Abstract:
Molybdenum (Mo) is one of the target materials for laser powder bed fusion additive manufacturing processes. Using the following set of printing parameters: E=179 W; v=133 mm/s; h=60 µm and t=30 µm, crack-free Mo specimens were printed, subjected to hot isostatic pressing (1300°C & 150 MPa for 3 hours), and characterized in terms of their density, structure, and compression behavior at room and elevated temperatures. The results obtained with as-built specimens with a printed density of ~97% and an ultimate compression stress of 486, 242, 264 and 145 MPa at 20, 600, 800 and 1000°C respectively, are comparable to those shown by their counterparts produced by conventional powder metallurgy processes. The selected HIP conditions resulted in a ~1% increase in the part density, but simultaneous porosity evolution and grain coarsening led to a concurrent ~10% decrease in the room and elevated-temperature mechanical properties of printed parts.
DOI:
https://doi.org/10.59499/EP246281988
