A DCAMM seminar will be presented by
Dr. Bjørn Clausen
Los Alamos National Laboratory,
Los Alamos, USA
Abstract:
Additive manufacturing (AM) is a manufacturing philosophy where parts and components are built to near net shape by consolidating powders, contrary to the traditional removal techniques based on machining from wrought blanks. Several techniques for AM have been developed over the last few decades and common for all is that the achieved microstructure within the final product is significantly different than the microstructures of the traditional wrought materials, which have been investigated and optimized for centuries. Hence it is paramount to characterize and understand the mechanical properties of the AM materials in order to certify their use in critical parts. Within the last decade significant efforts worldwide have been applied to this task, and to the development of microstructure aware models that are capable of predicting the performance of the built materials.
We will present the results of in-situ neutron diffraction measurements performed using the SMARTS instrument at Los Alamos National Laboratory (LANL) on 304L stainless steel samples made using a high power variant of the Laser Engineering Net Shape (LENS) technique as well as GP-1 samples (same chemistry as the 17-4 PH stainless steel) made using the Powder Bed technique. The diffraction data provides direct information about the residual stresses in the parts after manufacture as well as the development of microstructure, internal stress state and texture during processing, such as heat treatment and deformation. The experimental data will directly feed into microstructure aware models for the AM materials being developed at Los Alamos and Sandia National Laboratories.
Danish pastry, coffee and tea will be served 15 minutes before the seminar starts.
All interested persons are invited